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Ricken, Tim

Tim Ricken

Herr Univ.-Prof. Dr.-Ing.

Institutsleiter
Institut für Statik und Dynamik der Luft- und Raumfahrtkonstruktionen
[Foto: Max Kovalenko]

Kontakt

+49 711 685 63612
+49 711 685 63706
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Visitenkarte (VCF)

Pfaffenwaldring 27
70569 Stuttgart
Deutschland
Raum: 00.048

Publikationen

2024
1. Seyedpour, Seyed Morteza ; Azhdari, Mohammad ; Lambers, Lena ; Ricken, Tim ; Rezazadeh, Ghader: One-dimensional thermomechanical bio-heating analysis of viscoelastic tissue to laser radiation shapes. In: International Journal of Heat and Mass Transfer, International Journal of Heat and Mass Transfer. Bd. 218 (2024), S. 124747
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  @article{Seyedpour.2024, author = {Seyedpour, Seyed Morteza and Azhdari, Mohammad and Lambers, Lena and Ricken, Tim and Rezazadeh, Ghader}, doi = {10.1016/j.ijheatmasstransfer.2023.124747}, file = {Seyedpour, Azhdari et al 2024 - One-dimensional thermomechanical bio-heating analysis:Attachments/Seyedpour, Azhdari et al 2024 - One-dimensional thermomechanical bio-heating analysis.pdf:application/pdf}, journal = {International Journal of Heat and Mass Transfer}, pages = 124747, title = {One-dimensional thermomechanical bio-heating analysis of viscoelastic tissue to laser radiation shapes}, volume = 218, year = 2024 }
2. Lambers, Lena ; Waschinsky, Navina ; Schleicher, Jana ; König, Matthias ; Tautenhahn, Hans-Michael ; Albadry, Mohamed ; Dahmen, Uta ; Ricken, Tim: Quantifying fat zonation in liver lobules: an integrated multiscale in silico model combining disturbed microperfusion and fat metabolism via a continuum biomechanical bi-scale, tri-phasic approach. In: Biomechanics and Modeling in Mechanobiology, Biomechanics and Modeling in Mechanobiology. (2024)
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  @article{Lambers.2024, abstract = {Metabolic zonation refers to the spatial separation of metabolic functions along the sinusoidal axes of the liver. This phenomenon forms the foundation for adjusting hepatic metabolism to physiological requirements in health and disease (e.g., metabolic dysfunction-associated steatotic liver disease/MASLD). Zonated metabolic functions are influenced by zonal morphological abnormalities in the liver, such as periportal fibrosis and pericentral steatosis. We aim to analyze the interplay between microperfusion, oxygen gradient, fat metabolism and resulting zonated fat accumulation in a liver lobule. Therefore we developed a continuum biomechanical, tri-phasic, bi-scale, and multicomponent in silico model, which allows to numerically simulate coupled perfusion-function-growth interactions two-dimensionally in liver lobules. The developed homogenized model has the following specifications: (i) thermodynamically consistent, (ii) tri-phase model (tissue, fat, blood), (iii) penta-substances (glycogen, glucose, lactate, FFA, and oxygen), and (iv) bi-scale approach (lobule, cell). Our presented in silico model accounts for the mutual coupling between spatial and time-dependent liver perfusion, metabolic pathways and fat accumulation. The model thus allows the prediction of fat development in the liver lobule, depending on perfusion, oxygen and plasma concentration of free fatty acids (FFA), oxidative processes, the synthesis and the secretion of triglycerides (TGs). The use of a bi-scale approach allows in addition to focus on scale bridging processes. Thus, we will investigate how changes at the cellular scale affect perfusion at the lobular scale and vice versa. This allows to predict the zonation of fat distribution (periportal or pericentral) depending on initial conditions, as well as external and internal boundary value conditions.}, author = {Lambers, Lena and Waschinsky, Navina and Schleicher, Jana and K{\"o}nig, Matthias and Tautenhahn, Hans-Michael and Albadry, Mohamed and Dahmen, Uta and Ricken, Tim}, doi = {10.1007/s10237-023-01797-0}, file = {Lambers, Waschinsky et al. 2024 - Quantifying fat zonation in liver:Attachments/Lambers, Waschinsky et al. 2024 - Quantifying fat zonation in liver.pdf:application/pdf}, issn = {1617-7940}, journal = {Biomechanics and Modeling in Mechanobiology}, title = {Quantifying fat zonation in liver lobules: an integrated multiscale in silico model combining disturbed microperfusion and fat metabolism via a continuum biomechanical bi-scale, tri-phasic approach}, year = 2024 }
2023
1. Mandl, Luis ; Mielke, André ; Seyedpour, Seyed Morteza ; Ricken, Tim: Affine transformations accelerate the training of physics-informed neural networks of a one-dimensional consolidation problem. In: Scientific Reports, Scientific Reports. Bd. 13 (2023), Nr. 1, S. 15566
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  @article{Mandl.2023, abstract = {Physics-informed neural networks~(PINNs) leverage data and knowledge about a problem. They provide a nonnumerical pathway to solving partial differential equations by expressing the field solution as an artificial neural network. This approach has been applied successfully to various types of differential equations. A major area of research on PINNs is the application to coupled partial differential equations in particular, and a general breakthrough is still lacking. In coupled equations, the optimization operates in a critical conflict between boundary conditions and the underlying equations, which often requires either many iterations or complex schemes to avoid trivial solutions and to achieve convergence. We provide empirical evidence for the mitigation of bad initial conditioning in PINNs for solving one-dimensional consolidation problems of porous media through the introduction of affine transformations after the classical output layer of artificial neural network architectures, effectively accelerating the training process. These affine physics-informed neural networks~(AfPINNs) then produce nontrivial and accurate field solutions even in parameter spaces with diverging orders of magnitude. On average, AfPINNs show the ability to improve the [Formula: see text] relative error by [Formula: see text] after 25,000 epochs for a one-dimensional consolidation problem based on Biot's theory, and an average improvement by [Formula: see text] with a transfer approach to the theory of porous media.}, author = {Mandl, Luis and Mielke, Andr{\'e} and Seyedpour, Seyed Morteza and Ricken, Tim}, doi = {10.1038/s41598-023-42141-x}, file = {Mandl, Mielke et al. 2023 - Affine transformations accelerate the training:Attachments/Mandl, Mielke et al. 2023 - Affine transformations accelerate the training.pdf:application/pdf}, journal = {Scientific Reports}, number = 1, pages = 15566, title = {Affine transformations accelerate the training of physics-informed neural networks of a one-dimensional consolidation problem}, url = {https://doi.org/10.1038/s41598-023-42141-x}, volume = 13, year = 2023 }
  Link
  https://doi.org/10.1038/s41598-023-42141-x
2. Seyedpour, S. M. ; Thom, A. ; Ricken, T.: Simulation of Contaminant Transport through the Vadose Zone: A Continuum Mechanical Approach within the Framework of the Extended Theory of Porous Media (eTPM). In: Water, Water. Bd. 15 (2023), Nr. 2, S. 343
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  @article{Seyedpour.2023, author = {Seyedpour, S. M. and Thom, A. and Ricken, T.}, doi = {10.3390/w15020343}, journal = {Water}, number = 2, pages = 343, title = {Simulation of Contaminant Transport through the Vadose Zone: A Continuum Mechanical Approach within the Framework of the Extended Theory of Porous Media (eTPM)}, volume = 15, year = 2023 }
3. Trivedi, Zubin ; Gehweiler, Dominic ; Wychowaniec, Jacek K. ; Ricken, Tim ; Gueorguiev-Rüegg, Boyko ; Wagner, Arndt ; Röhrle, Oliver: Analysing the bone cement flow in the injection apparatus during vertebroplasty. In: PAMM, PAMM. Bd. 23 (2023), Nr. 1
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  @article{Trivedi.2023, author = {Trivedi, Zubin and Gehweiler, Dominic and Wychowaniec, Jacek K. and Ricken, Tim and Gueorguiev-R{\"u}egg, Boyko and Wagner, Arndt and R{\"o}hrle, Oliver}, doi = {10.1002/pamm.202200295}, file = {Trivedi, Gehweiler et al 2023 - Analysing the bone cement flow:Attachments/Trivedi, Gehweiler et al 2023 - Analysing the bone cement flow.pdf:application/pdf}, issn = {1617-7061}, journal = {PAMM}, number = 1, title = {Analysing the bone cement flow in the injection apparatus during vertebroplasty}, volume = 23, year = 2023 }
4. Suditsch, Marlon ; Ricken, Tim ; Wagner, Arndt: Patient--specific simulation of brain tumour growth and regression. In: PAMM, PAMM. Bd. 23 (2023), Nr. 1
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  @article{Suditsch.2023, author = {Suditsch, Marlon and Ricken, Tim and Wagner, Arndt}, doi = {10.1002/pamm.202200213}, file = {Suditsch, Ricken et al 2023 - Patient-specific simulation of brain tumour:Attachments/Suditsch, Ricken et al 2023 - Patient-specific simulation of brain tumour.pdf:application/pdf}, issn = {1617-7061}, journal = {PAMM}, number = 1, title = {Patient--specific simulation of brain tumour growth and regression}, volume = 23, year = 2023 }
5. Seyedpour, S. M. ; Henning, C. ; Kirmizakis, P. ; Herbrandt, S. ; Ickstadt, K. ; Doherty, R. ; Ricken, T.: Uncertainty with Varying Subsurface Permeabilities Reduced Using Coupled Random Field and Extended Theory of Porous Media Contaminant Transport Models. In: Water, Water. Bd. 15 (2023), Nr. 1
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  @article{Seyedpour.2023, abstract = {To maximize the usefulness of groundwater flow models for the protection of aquifers and abstraction wells, it is necessary to identify and decrease the uncertainty associated with the major parameters such as permeability. To do this, there is a need to develop set of estimates representing subsurface heterogeneity or representative soil permeability estimates. Here, we use a coupled Random Field and extended Theory of Porous Media (eTPM) simulation to develop a robust model with a good predictive ability that reduces uncertainty. The coupled model is then validated with a physical sandbox experiment. Uncertainty is reduced by using 500 realisations of the permeability parameter using the eTPM approach. A multi-layer contaminant transport scenario with varying permeabilities, similar to what could be expected with shallow alluvial sediments, is simulated. The results show that the contaminant arrival time could be strongly affected by random field realizations of permeability compared with a modelled homogenous permeability parameter. The breakthrough time for heterogeneous permeabilities is shorter than the homogeneous condition. Using the 75{\%} confidence interval (CI), the average contaminant concentration shows 4.4{\%} variation from the average values of the considered area and 8.9{\%} variation in the case of a 95{\%} confidence interval.}, author = {Seyedpour, S. M. and Henning, C. and Kirmizakis, P. and Herbrandt, S. and Ickstadt, K. and Doherty, R. and Ricken, T.}, doi = {10.3390/w15010159}, file = {Seyedpour, Henning et al. 2023 - Uncertainty with Varying Subsurface Permeabilities:Attachments/Seyedpour, Henning et al. 2023 - Uncertainty with Varying Subsurface Permeabilities.pdf:application/pdf}, journal = {Water}, number = 1, title = {Uncertainty with Varying Subsurface Permeabilities Reduced Using Coupled Random Field and Extended Theory of Porous Media Contaminant Transport Models}, url = {https://www.mdpi.com/2073-4441/15/1/159}, volume = 15, year = 2023 }
  Link
  https://www.mdpi.com/2073-4441/15/1/159
6. Azhdari, Mohammad ; Seyedpour, Seyed Morteza ; Ricken, Tim ; Rezazadeh, Ghader: On the thermo-vibrational response of multi-layer viscoelastic skin tissue to laser irradiation. In: International Journal of Thermal Sciences, International Journal of Thermal Sciences. Bd. 187 (2023), S. 108160
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  @article{Azhdari.2023, author = {Azhdari, Mohammad and Seyedpour, Seyed Morteza and Ricken, Tim and Rezazadeh, Ghader}, doi = {10.1016/j.ijthermalsci.2023.108160}, issn = {12900729}, journal = {International Journal of Thermal Sciences}, pages = 108160, title = {On the thermo-vibrational response of multi-layer viscoelastic skin tissue to laser irradiation}, url = {https://doi.org/10.1016/j.ijthermalsci.2023.108160}, volume = 187, year = 2023 }
  Link
  https://doi.org/10.1016/j.ijthermalsci.2023.108160
7. Völter, Jan-Sören L. ; Ricken, Tim ; Röhrle, Oliver: About the applicability of the theory of porous media for the modelling of non--isothermal material injection into porous structures. In: PAMM, PAMM. Bd. 23 (2023), Nr. 1
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  @article{Volter.2023, author = {V{\"o}lter, Jan-S{\"o}ren L. and Ricken, Tim and R{\"o}hrle, Oliver}, doi = {10.1002/pamm.202200070}, file = {V{\"o}lter, Ricken et al. 2023 - About the applicability:Attachments/V{\"o}lter, Ricken et al. 2023 - About the applicability.pdf:application/pdf}, issn = {1617-7061}, journal = {PAMM}, number = 1, title = {About the applicability of the theory of porous media for the modelling of non--isothermal material injection into porous structures}, volume = 23, year = 2023 }
8. Trivedi, Zubin ; Gehweiler, Dominic ; Wychowaniec, Jacek K. ; Ricken, Tim ; Gueorguiev, Boyko ; Wagner, Arndt ; Röhrle, Oliver: A continuum mechanical porous media model for vertebroplasty: Numerical simulations and experimental validation. In: Biomechanics and Modeling in Mechanobiology, Biomechanics and Modeling in Mechanobiology. Bd. 22 (2023), Nr. 4, S. 1253--1266
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  @article{Trivedi.2023, abstract = {The outcome of vertebroplasty is hard to predict due to its dependence on complex factors like bone cement and marrow rheologies. Cement leakage could occur if the procedure is done incorrectly, potentially causing adverse complications. A reliable simulation could predict the patient-specific outcome preoperatively and avoid the risk of cement leakage. Therefore, the aim of this work was to introduce a computationally feasible and experimentally validated model for simulating vertebroplasty. The developed model is a multiphase continuum-mechanical macro-scale model based on the Theory of Porous Media. The related governing equations were discretized using a combined finite element-finite volume approach by the so-called Box discretization. Three different rheological upscaling methods were used to compare and determine the most suitable approach for this application. For validation, a benchmark experiment was set up and simulated using the model. The influence of bone marrow and parameters like permeability, porosity, etc., was investigated to study the effect of varying conditions on vertebroplasty. The presented model could realistically simulate the injection of bone cement in porous materials when used with the correct rheological upscaling models, of which the semi-analytical averaging of the viscosity gave the best results. The marrow viscosity is identified as the crucial reference to categorize bone cements as 'high- 'or 'low-' viscosity in the context of vertebroplasty. It is confirmed that a cement with higher viscosity than the marrow ensures stable development of the injection and a proper cement interdigitation inside the vertebra.}, author = {Trivedi, Zubin and Gehweiler, Dominic and Wychowaniec, Jacek K. and Ricken, Tim and Gueorguiev, Boyko and Wagner, Arndt and R{\"o}hrle, Oliver}, doi = {10.1007/s10237-023-01715-4}, file = {Trivedi, Gehweiler et al. 2023 - A continuum mechanical porous media:Attachments/Trivedi, Gehweiler et al. 2023 - A continuum mechanical porous media.pdf:application/pdf}, issn = {1617-7940}, journal = {Biomechanics and Modeling in Mechanobiology}, number = 4, pages = {1253--1266}, title = {A continuum mechanical porous media model for vertebroplasty: Numerical simulations and experimental validation}, volume = 22, year = 2023 }
2022
1. Arasteh-Khoshbin, Omolbanin ; Seyedpour, Seyed ; Ricken, Tim: The effect of Caspian Sea water on mechanical properties and durability of concrete containing rice husk ash, nano SiO2, and nano Al2O3. In: Scientific Reports, Scientific Reports. Bd. 12 (2022), S. 20202
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  @article{ArastehKhoshbin.2022, abstract = { Various studies have been recently conducted aiming at developing more sustainable cementitious systems so that concrete structures may not have a negative effect on the environment and are decomposed. It has been attempted to build sustainable binders by substituting silica fume, cement with fly ash, nano�silica, nano�alumina, and rice husk ash. In this paper, a series of experiments on concrete with different contents of rice husk ash (10{\%}, 15{\%}, and 20{\%}), nanoSiO2 (1{\%}, 2{\%}, 3{\%}, 4{\%}, 5{\%}, 6{\%}, 7{\%}, 8{\%}), and nanoAl2O3 (1{\%}, 2{\%}, 3{\%}, 4{\%}) are performed to analyze the durability and mechanical properties of samples under the curing condition of Caspian seawater. The workability, density, water penetration, chloride ion penetration, and compressive strength (at 7, 14, 28, and 90 day) of the samples were determined. The experimental results showed that workability decreased gradually with increasing additives content, while the compressive gradually increased. Among the additives, adding 8{\%} of the nanoSiO2 had the most significant effect on the improvement of compressive strength. Adding 8{\%} nanoSiO2 and 4{\%} nanoAl2O3 reduced the depth of water permeability by 53{\%} and 30{\%}, respectively. Furthermore, adding 8{\%} nanoSiO2 reduced chloride ion penetration by 85{\%}.}, author = {Arasteh-Khoshbin, Omolbanin and Seyedpour, Seyed and Ricken, Tim}, doi = {10.1038/s41598-022-24304-4}, file = {Arasteh-Khoshbin, Seyedpour et al 2022 - The effect of Caspian Sea:Attachments/Arasteh-Khoshbin, Seyedpour et al 2022 - The effect of Caspian Sea.pdf:application/pdf}, journal = {Scientific Reports}, pages = 20202, title = {The effect of Caspian Sea water on mechanical properties and durability of concrete containing rice husk ash, nano SiO2, and nano Al2O3}, url = {https://www.nature.com/articles/s41598-022-24304-4}, volume = 12, year = 2022 }
  Link
  https://www.nature.com/articles/s41598-022-24304-4
2. Seyedpour, S. M. ; Nafisi, S. ; Nabati, M. ; Pierce, D. M. ; Reichenbach, J. R. ; Ricken, T.: Magnetic Resonance Imaging--based biomechanical simulation of cartilage: A systematic review. In: Journal of the Mechanical Behavior of Biomedical Materials, Journal of the Mechanical Behavior of Biomedical Materials. Bd. 126 (2022), S. 104963
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  @article{Seyedpour.2021, abstract = {MRI-based mathematical and computational modelling studies can contribute to a better understanding of the mechanisms governing cartilage's mechanical performance and cartilage disease. In addition, distinct modelling of cartilage is needed to optimize artificial cartilage production. These studies have opened up the prospect of further deepening our understanding of cartilage function. Furthermore, these studies reveal the initiation of an engineering-level approach to how cartilage disease affects material properties and cartilage function. Aimed at researchers in the field of MRI-based cartilage simulation, research articles pertinent to MRI-based cartilage modelling were identified, reviewed, and summarized systematically. Various MRI applications for cartilage modelling are highlighted, and the limitations of different constitutive models used are addressed. In addition, the clinical application of simulations and studied diseases are discussed. The paper's quality, based on the developed questionnaire, was assessed, and out of 79 reviewed papers, 34 papers were determined as high-quality. Due to the lack of the best constitutive models for various clinical conditions, researchers may consider the effect of constitutive material models on the cartilage disease simulation. In the future, research groups may incorporate various aspects of machine learning into constitutive models and MRI data extraction to further refine the study methodology. Moreover, researchers should strive for further reproducibility and rigorous model validation and verification, such as gait analysis.}, author = {Seyedpour, S. M. and Nafisi, S. and Nabati, M. and Pierce, D. M. and Reichenbach, J. R. and Ricken, T.}, doi = {10.1016/j.jmbbm.2021.104963}, issn = {1751-6161}, journal = {Journal of the Mechanical Behavior of Biomedical Materials}, pages = 104963, title = {Magnetic Resonance Imaging--based biomechanical simulation of cartilage: A systematic review}, url = {https://www.sciencedirect.com/science/article/pii/S1751616121005932}, volume = 126, year = 2022 }
  Link
  https://www.sciencedirect.com/science/article/pii/S1751616121005932
3. Bertrand, Fleurianne ; Brodbeck, Maximilian ; Ricken, Tim: On robust discretization methods for poroelastic problems: Numerical examples and counter-examples. In: Examples and Counterexamples, Examples and Counterexamples. Bd. 2 (2022), S. 100087
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  @article{Bertrand.2022, abstract = {Finite element approximations of poroelastic materials are nowadays used within multiple applications. Due to wide variation of possible material parameters, robustness of the considered discretization is important. Within this contribution robust of discretization schemes, initially developed for Biot's theory, will be applied within the Theory of Porous Media. Selected numerical test-cases, special attention will be paid to incompressible and impermeable regimes, are conducted.}, author = {Bertrand, Fleurianne and Brodbeck, Maximilian and Ricken, Tim}, doi = {10.1016/j.exco.2022.100087}, file = {Bertrand, Brodbeck et al 2022 - On robust discretization methods:Attachments/Bertrand, Brodbeck et al 2022 - On robust discretization methods.pdf:application/pdf}, issn = {2666-657X}, journal = {Examples and Counterexamples}, pages = 100087, title = {On robust discretization methods for poroelastic problems: Numerical examples and counter-examples}, url = {https://www.sciencedirect.com/science/article/pii/S2666657X22000209}, volume = 2, year = 2022 }
  Link
  https://www.sciencedirect.com/science/article/pii/S2666657X22000209
4. Ricken, Tim ; Schröder, Jörg ; Bluhm, Joachim ; Maike, Simon ; Bartel, Florian: Theoretical formulation and computational aspects of a two-scale homogenization scheme combining the TPM and FE 2 method for poro-elastic fluid-saturated porous media. In: International Journal of Solids and Structures, International Journal of Solids and Structures. Bd. 241 (2022), S. 111412
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  @article{Ricken.2022, abstract = {The focus of this investigation lies on the development of a two-scale homogenization scheme for poro-elastic fluid-saturated porous media. For this purpose, the general concepts of the Theory of Porous Media (TPM) are combined with the FE2 method. After an introduction of the basics of TPM, the weak forms for the macroscopic and the microscopic scale will be formulated and the averaged macroscopic tangent moduli considering the microscale will be derived. Additionally, the formulation of lower level boundary conditions, which refer to the quantities that will be transmitted from the macro- to the microscale, in strict compliance with the Hill--Mandel homogeneity condition, is derived. Finally, a numerical example will be presented, pointing out the gained features of the methodology.}, author = {Ricken, Tim and Schr{\"o}der, J{\"o}rg and Bluhm, Joachim and Maike, Simon and Bartel, Florian}, doi = {10.1016/j.ijsolstr.2021.111412}, file = {9fadf47f-ee01-430c-aa94-8dde1f63dcd8:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\9fadf47f-ee01-430c-aa94-8dde1f63dcd8.pdf:pdf;903260bc-2689-49f1-8826-26b888776346:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\903260bc-2689-49f1-8826-26b888776346.pdf:pdf}, issn = {0020-7683}, journal = {International Journal of Solids and Structures}, pages = 111412, title = {Theoretical formulation and computational aspects of a two-scale homogenization scheme combining the TPM and FE 2 method for poro-elastic fluid-saturated porous media}, url = {https://www.sciencedirect.com/science/article/pii/S0020768321004674}, volume = 241, year = 2022 }
  Link
  https://www.sciencedirect.com/science/article/pii/S0020768321004674
5. Armiti-Juber, Alaa ; Ricken, Tim: Model order reduction for deformable porous materials in thin domains via asymptotic analysis. In: Archive of Applied Mechanics, Archive of Applied Mechanics. Bd. 92 (2022), Nr. 2, S. 597–618
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  @article{ArmitiJuber.2021, abstract = {We study fluid-saturated porous materials that undergo poro-elastic deformations in thin domains. The mechanics in such materials are described using a biphasic model based on the theory of porous media (TPM) and consisting of a system of differential equations for material’s displacement and fluid’s pressure. These equations are in general strongly coupled and nonlinear, such that exact solutions are hard to obtain and numerical solutions are computationally expensive. This paper reduces the complexity of the biphasic model in thin domains with a scale separation between domain’s width and length. Based on standard asymptotic analysis, we derive a reduced model that combines two sub-models. Firstly, a limit model consists of averaged equations that describe the fluid pore pressure and displacement in the longitudinal direction of the domain. Secondly, a corrector model re-captures the mechanics in the transverse direction. The validity of the reduced model is finally tested using a set of numerical examples. These demonstrate the computational efficiency of the reduced model, while maintaining reliable solutions in comparison with original biphasic TPM model in thin domain. }, author = {Armiti-Juber, Alaa and Ricken, Tim}, doi = {10.1007/s00419-021-01907-3}, file = {848c2012-85ab-49a4-81c6-b2f50fa94646:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\848c2012-85ab-49a4-81c6-b2f50fa94646.pdf:pdf}, issn = {1432-0681}, journal = {Archive of Applied Mechanics}, number = 2, pages = {597–618}, title = {Model order reduction for deformable porous materials in thin domains via asymptotic analysis}, url = {https://link.springer.com/article/10.1007/s00419-021-01907-3}, volume = 92, year = 2022 }
  Link
  https://link.springer.com/article/10.1007/s00419-021-01907-3
2021
1. Lambers, Lena ; Suditsch, Marlon ; Wagner, Arndt ; Ricken, Tim: A Multiscale and Multiphase Model of Function--Perfusion Growth Processes in the Human Liver. In: PAMM, PAMM. Bd. 20 (2021), Nr. 1
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  @article{Lambers.2021, author = {Lambers, Lena and Suditsch, Marlon and Wagner, Arndt and Ricken, Tim}, doi = {\url{10.1002/pamm.202000290}}, file = {bccd2b1f-1147-447e-9e2f-ed721d542ea8:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\bccd2b1f-1147-447e-9e2f-ed721d542ea8.pdf:pdf}, issn = {16177061}, journal = {{PAMM}}, number = 1, title = {{A Multiscale and Multiphase Model of Function--Perfusion Growth Processes in the Human Liver}}, volume = 20, year = 2021 }
2. Egli, Franziska S. ; Straube, Richard C. ; Mielke, André ; Ricken, Tim: Surrogate Modeling of a Nonlinear, Biphasic Model of Articular Cartilage with Artificial Neural Networks. In: PAMM, PAMM. Bd. 21 (2021), Nr. 1, S. e202100188
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  @article{Egli.2021, abstract = {Abstract The increasing number of cartilage diseases negatively affects the quality of life for a large part of the population. Understanding the mechanical properties of cartilage is a key component in investigating and mitigating the effects of such diseases. To describe the behavior of articular cartilage, a biphasic fiber-reinforced numerical model based on the Theory of Porous Media (TPM) has been developed. To possibly provide an alternative for the corresponding time-consuming computational simulations, the suitability of Artificial Neural Networks (ANNs) as surrogate models is investigated. For this purpose, the simulation results of a compression-relaxation test are compared with the predictions of the ANN.}, author = {Egli, Franziska S. and Straube, Richard C. and Mielke, Andr{\'e} and Ricken, Tim}, doi = {10.1002/pamm.202100188}, file = {1b4285fa-46bf-42d9-9eb2-c4cc1b19826c:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\1b4285fa-46bf-42d9-9eb2-c4cc1b19826c.pdf:pdf}, issn = {1617-7061}, journal = {PAMM}, number = 1, pages = {e202100188}, title = {Surrogate Modeling of a Nonlinear, Biphasic Model of Articular Cartilage with Artificial Neural Networks}, volume = 21, year = 2021 }
3. Mielke, André ; Ricken, Tim: Finite element analysis of a 2D cantilever on a noisy intermediate-scale quantum computer. In: PAMM, PAMM. Bd. 21 (2021), Nr. 1, S. e202100246
  - BibTeX
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  @article{Mielke.2021, abstract = {Abstract Quantum computing is a promising new computing paradigm that may yield both significant speedup over classical algorithms as well as new ways to think about problems and finding novel solution algorithms. While large-scale error-corrected quantum computers are still under development, a selection of noisy intermediate-scale quantum processing units is readily made available by some companies via cloud access. Despite the lack of error correction, these units can be used to test established quantum algorithms on custom problem setups. Here, we solve the finite element problem of a two-dimensional cantilever, completely fixed on one side and loaded on the opposite side, on a 15-qubit QPU from IBM.}, author = {Mielke, Andr{\'e} and Ricken, Tim}, doi = {10.1002/pamm.202100246}, file = {b7c5e9ec-8641-4e4a-bef1-baee2e2b8236:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\b7c5e9ec-8641-4e4a-bef1-baee2e2b8236.pdf:pdf}, issn = {1617-7061}, journal = {PAMM}, number = 1, pages = {e202100246}, title = {Finite element analysis of a 2D cantilever on a noisy intermediate-scale quantum computer}, volume = 21, year = 2021 }
4. Trivedi, Zubin ; Bleiler, Christian ; Gehweiler, Dominic ; Gueorguiev-Rüegg, Boyko ; Ricken, Tim ; Wagner, Arndt ; Röhrle, Oliver: Simulating vertebroplasty: A biomechanical challenge. In: PAMM, PAMM. Bd. 20 (2021), Nr. 1
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  - Link
  BibTeX
  @article{Trivedi.2021, author = {Trivedi, Zubin and Bleiler, Christian and Gehweiler, Dominic and Gueorguiev-R{\"u}egg, Boyko and Ricken, Tim and Wagner, Arndt and R{\"o}hrle, Oliver}, doi = {\url{10.1002/pamm.202000313}}, file = {9e6e80c3-5f6a-4210-97e8-bb7ca70c3e85:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\9e6e80c3-5f6a-4210-97e8-bb7ca70c3e85.pdf:pdf}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, title = {{Simulating vertebroplasty: A biomechanical challenge}}, url = {https://onlinelibrary.wiley.com/doi/full/10.1002/pamm.202000313}, volume = 20, year = 2021 }
  Link
  https://onlinelibrary.wiley.com/doi/full/10.1002/pamm.202000313
5. Pi Savall, Berta ; Mielke, André ; Ricken, Tim: Data--Driven Stress Prediction for Thermoplastic Materials. In: PAMM, PAMM. Bd. 21 (2021), Nr. 1
  - BibTeX
  BibTeX
  @article{PiSavall.2021, author = {{Pi Savall}, Berta and Mielke, Andr{\'e} and Ricken, Tim}, doi = {10.1002/pamm.202100225}, file = {081f4237-008b-461d-96b8-4a1b86e8daab:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\081f4237-008b-461d-96b8-4a1b86e8daab.pdf:pdf}, issn = {1617-7061}, journal = {PAMM}, number = 1, title = {Data--Driven Stress Prediction for Thermoplastic Materials}, volume = 21, year = 2021 }
6. Bertrand, Fleurianne ; Lambers, Lena ; Ricken, Tim: Least Squares Finite Element Method for Hepatic Sinusoidal Blood Flow. In: PAMM, PAMM. Bd. 20 (2021), Nr. 1
  - BibTeX
  BibTeX
  @article{Bertrand.2021, author = {Bertrand, Fleurianne and Lambers, Lena and Ricken, Tim}, doi = {\url{10.1002/pamm.202000306}}, file = {7bc40a25-3847-4d28-a155-faf3ec25d609:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\7bc40a25-3847-4d28-a155-faf3ec25d609.pdf:pdf}, issn = {16177061}, journal = {{PAMM}}, number = 1, title = {{Least Squares Finite Element Method for Hepatic Sinusoidal Blood Flow}}, volume = 20, year = 2021 }
7. Seyedpour, S. M. ; Valizadeh, I. ; Kirmizakis, P. ; Doherty, R. ; Ricken, T.: Optimization of the Groundwater Remediation Process Using a Coupled Genetic Algorithm-Finite Difference Method. In: Water, Water. Bd. 13 (2021), Nr. 3, S. 383
  - BibTeX
  - Link
  BibTeX
  @article{Seyedpour.2021, author = {Seyedpour, S. M. and Valizadeh, I. and Kirmizakis, P. and Doherty, R. and Ricken, T.}, doi = {10.3390/w13030383}, file = {Das Attachment konnte nicht verknüpft werden. Die interne Fehlermeldung lautet: Eine Ausnahme vom Typ "SwissAcademic.Azure.CitaviWebApiException" wurde ausgelöst.}, journal = {Water}, number = 3, pages = 383, title = {{Optimization of the Groundwater Remediation Process Using a Coupled Genetic Algorithm-Finite Difference Method}}, url = {https://www.mdpi.com/2073-4441/13/3/383}, volume = 13, year = 2021 }
  Link
  https://www.mdpi.com/2073-4441/13/3/383
8. Suditsch, M. ; Lambers, L. ; Ricken, T. ; Wagner, A.: Application of a continuum--mechanical tumour model to brain tissue. In: PAMM, PAMM. Bd. 21 (2021), Nr. 1
  - BibTeX
  BibTeX
  @article{Suditsch.2021, author = {Suditsch, M. and Lambers, L. and Ricken, T. and Wagner, A.}, doi = {10.1002/pamm.202100204}, file = {ab58dae5-7116-4178-b8aa-75fe1c67fb34:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\ab58dae5-7116-4178-b8aa-75fe1c67fb34.pdf:pdf}, issn = {1617-7061}, journal = {PAMM}, number = 1, title = {Application of a continuum--mechanical tumour model to brain tissue}, volume = 21, year = 2021 }
9. Christ, Bruno ; Collatz, Maximilian ; Dahmen, Uta ; Herrmann, Karl-Heinz ; Höpfl, Sebastian ; König, Matthias ; Lambers, Lena ; Marz, Manja ; u. a.: Hepatectomy-Induced Alterations in Hepatic Perfusion and Function - Toward Multi-Scale Computational Modeling for a Better Prediction of Post-hepatectomy Liver Function. In: Frontiers in Physiology, Frontiers in Physiology. Bd. 12 (2021), S. 579
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  BibTeX
  @article{Christ.2021, author = {Christ, Bruno and Collatz, Maximilian and Dahmen, Uta and Herrmann, Karl-Heinz and H{\"o}pfl, Sebastian and K{\"o}nig, Matthias and Lambers, Lena and Marz, Manja and Meyer, Daria and Radde, Nicole and Reichenbach, J{\"u}rgen R. and Ricken, Tim and Tautenhahn, Hans-Michael}, doi = {10.3389/fphys.2021.733868}, file = {2ca6326e-5c65-4a54-8a33-3516a7f92b52:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\2ca6326e-5c65-4a54-8a33-3516a7f92b52.pdf:pdf}, journal = {Frontiers in Physiology}, pages = 579, title = {Hepatectomy-Induced Alterations in Hepatic Perfusion and Function - Toward Multi-Scale Computational Modeling for a Better Prediction of Post-hepatectomy Liver Function}, volume = 12, year = 2021 }
10. Seyedpour, Seyed M. ; Nabati, Mehdi ; Lambers, Lena ; Nafisi, Sara ; Tautenhahn, Hans-Michael ; Sack, Ingolf ; Reichenbach, Jürgen R. ; Ricken, Tim: Application of Magnetic Resonance Imaging in Liver Biomechanics: A Systematic Review. In: Frontiers in Physiology, Frontiers in Physiology. Bd. 12 (2021), S. 733393
  - BibTeX
  BibTeX
  @article{Seyedpour.2021, abstract = {MRI-based biomechanical studies can provide a deep understanding of the mechanisms governing liver function, its mechanical performance but also liver diseases. In addition, comprehensive modeling of the liver can help improve liver disease treatment. Furthermore, such studies demonstrate the beginning of an engineering-level approach to how the liver disease affects material properties and liver function. Aimed at researchers in the field of MRI-based liver simulation, research articles pertinent to MRI-based liver modeling were identified, reviewed, and summarized systematically. Various MRI applications for liver biomechanics are highlighted, and the limitations of different viscoelastic models used in magnetic resonance elastography are addressed. The clinical application of the simulations and the diseases studied are also discussed. Based on the developed questionnaire, the papers' quality was assessed, and of the 46 reviewed papers, 32 papers were determined to be of high-quality. Due to the lack of the suitable material models for different liver diseases studied by magnetic resonance elastography, researchers may consider the effect of liver diseases on constitutive models. In the future, research groups may incorporate various aspects of machine learning (ML) into constitutive models and MRI data extraction to further refine the study methodology. Moreover, researchers should strive for further reproducibility and rigorous model validation and verification.}, author = {Seyedpour, Seyed M. and Nabati, Mehdi and Lambers, Lena and Nafisi, Sara and Tautenhahn, Hans-Michael and Sack, Ingolf and Reichenbach, J{\"u}rgen R. and Ricken, Tim}, doi = {10.3389/fphys.2021.733393}, file = {ae034bf1-c01b-46b6-ba9f-ed578b1e6237:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\ae034bf1-c01b-46b6-ba9f-ed578b1e6237.pdf:pdf}, journal = {Frontiers in Physiology}, pages = 733393, title = {Application of Magnetic Resonance Imaging in Liver Biomechanics: A Systematic Review}, volume = 12, year = 2021 }
11. Keller, Karsten ; Wallmersperger, Thomas ; Ricken, Tim: Sensitivity Analysis of a Simulated Hydrogel. In: PAMM, PAMM. Bd. 20 (2021), Nr. 1
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  BibTeX
  @article{Keller.2021, author = {Keller, Karsten and Wallmersperger, Thomas and Ricken, Tim}, doi = {\url{10.1002/pamm.202000317}}, file = {afcd55d2-ae92-4765-b111-1586025c6e30:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\afcd55d2-ae92-4765-b111-1586025c6e30.pdf:pdf}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, title = {{Sensitivity Analysis of a Simulated Hydrogel}}, volume = 20, year = 2021 }
12. Mielke, André ; Ricken, Tim: Solving linear equation systems on noisy intermediate--scale quantum computers. In: PAMM, PAMM. Bd. 20 (2021), Nr. 1
  - BibTeX
  BibTeX
  @article{Mielke.2021, author = {Mielke, Andr{\'e} and Ricken, Tim}, doi = {\url{10.1002/pamm.202000266}}, file = {c8a6b687-e98b-4e21-ba3e-d77040510a1b:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\c8a6b687-e98b-4e21-ba3e-d77040510a1b.pdf:pdf}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, title = {{Solving linear equation systems on noisy intermediate--scale quantum computers}}, volume = 20, year = 2021 }
13. Suditsch, M. ; Schröder, P. ; Lambers, L. ; Ricken, T. ; Ehlers, W. ; Wagner, A.: Modelling basal--cell carcinoma behaviour in avascular skin. In: PAMM, PAMM. Bd. 20 (2021), Nr. 1
  - BibTeX
  BibTeX
  @article{Suditsch.2021, author = {Suditsch, M. and Schr{\"o}der, P. and Lambers, L. and Ricken, T. and Ehlers, W. and Wagner, A.}, doi = {\url{10.1002/pamm.202000283}}, file = {f49e38bb-584c-444d-9747-8acb86336fbb:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\f49e38bb-584c-444d-9747-8acb86336fbb.pdf:pdf}, issn = {16177061}, journal = {{PAMM}}, number = 1, title = {{Modelling basal--cell carcinoma behaviour in avascular skin}}, volume = 20, year = 2021 }
14. Thom, Andrea ; Ricken, Tim: In Silico Modeling of Coupled Physical--Biogeochemical (P--BGC) Processes in Antarctic Sea Ice. In: PAMM, PAMM. Bd. 20 (2021), Nr. 1
  - BibTeX
  BibTeX
  @article{Thom.2021, author = {Thom, Andrea and Ricken, Tim}, doi = {\url{10.1002/pamm.202000308}}, file = {c4636b7e-9aea-407a-9982-8757b45086b4:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\c4636b7e-9aea-407a-9982-8757b45086b4.pdf:pdf}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, title = {{In Silico Modeling of Coupled Physical--Biogeochemical (P--BGC) Processes in Antarctic Sea Ice}}, volume = 20, year = 2021 }
15. Lambers, Lena ; Mielke, André ; Ricken, Tim: Semi--automated Data--driven FE Mesh Generation and Inverse Parameter Identification for a Multiscale and Multiphase Model of Function--Perfusion Processes in the Liver. In: PAMM, PAMM. Bd. 21 (2021), Nr. 1
  - BibTeX
  BibTeX
  @article{Lambers.2021, author = {Lambers, Lena and Mielke, Andr{\'e} and Ricken, Tim}, doi = {10.1002/pamm.202100190}, file = {047a9de4-970b-4e0a-8f7d-92dcb0eaf786:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\047a9de4-970b-4e0a-8f7d-92dcb0eaf786.pdf:pdf}, issn = {1617-7061}, journal = {PAMM}, number = 1, title = {Semi--automated Data--driven FE Mesh Generation and Inverse Parameter Identification for a Multiscale and Multiphase Model of Function--Perfusion Processes in the Liver}, volume = 21, year = 2021 }
16. Henning, Carla ; Brodbeck, Maximilian ; Koch, Christian ; Staudacher, Stephan ; Ricken, Tim: Phase--field model for erosion processes. In: PAMM, PAMM. Bd. 20 (2021), Nr. 1
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  BibTeX
  @article{Henning.2021, author = {Henning, Carla and Brodbeck, Maximilian and Koch, Christian and Staudacher, Stephan and Ricken, Tim}, doi = {\url{10.1002/pamm.202000282}}, file = {732327d5-5cef-467e-8d3a-8ddbeab49818:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\732327d5-5cef-467e-8d3a-8ddbeab49818.pdf:pdf}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, title = {{Phase--field model for erosion processes}}, volume = 20, year = 2021 }
2020
1. Hopkins, Gary ; Skatulla, S. ; Moj, L. ; Ricken, T. ; Ntusi, N. ; Meintjes, E.: A biphasic model for full cycle simulation of the human heart aimed at rheumatic heart disease. In: Computers & Structures, Computers & Structures. Bd. 232 (2020), S. 105920
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  @article{Hopkins.2020, abstract = {Rheumatic heart disease (RHD) is identified as a serious health concern in developing countries, specifically amongst young individuals, accounting for between 250 000 and 1.4 million deaths annually. As such, attention is initially placed on the importance of the development of a cardiac analysis toolbox with functionality for pathophysiological analysis of the disease. Subsequently, in order to develop a toolbox to further the understanding of the mechanisms of the disease as linked to changes in the cytoskeletal architecture and hypertrophy of cardiac myocytes, a continuum bi-phasic model applicable to cardiac tissue is formulated based on the theory of porous media (TPM). This makes it possible to account for interactions and contributions of multiple phases of constituent materials as well as concentrations of solved components, which in computational cardiac modelling are the solid phase -- the cardiac tissue -- and the liquid phase -- blood and interstitial fluid. Therefore, subsequent attention is paid to the cardiac model development in order to implement a sound base on which to add strain- and nutrient-driven phase transition, in addition to a nutrient phase contained within the liquid phase. To this end, based on thermodynamical restrictions, constitutive relations are proposed for stress, permeability, seepage velocity and interaction forces. The approach is implemented in the in-house computational cardiac mechanics toolbox SESKA which supports finite element as well as Element-free Galerkin-based approximations. This paper considers the passive and active non-linear elastic material behaviour of the myocardium of the left ventricle coupled with porous media theory, along with an additional coupling to the haemodynamics of the circulatory system, facilitating modelling of the full cardiac cycle. In order to illustrate the potential and efficacy of the approach with qualitative results, a human heart affected by RHD is investigated, making use of cardiovascular magnetic resonance scans taken over a period of two years to generate realistic 3D computer models.}, author = {Hopkins, Gary and Skatulla, S. and Moj, L. and Ricken, T. and Ntusi, N. and Meintjes, E.}, doi = {\url{10.1016/j.compstruc.2018.02.012}}, issn = {0045-7949}, journal = {{Computers {\&} Structures}}, pages = 105920, title = {{A biphasic model for full cycle simulation of the human heart aimed at rheumatic heart disease}}, url = {http://www.sciencedirect.com/science/article/pii/S0045794917306387}, volume = 232, year = 2020 }
  Link
  http://www.sciencedirect.com/science/article/pii/S0045794917306387
2. Ricken, Tim ; Thom, Andrea ; Gehrke, Tobias ; Denecke, Martin ; Widmann, Renatus ; Schulte, Marcel ; Schmidt, Thorsten C.: Biological Driven Phase Transitions in Fully or Partly Saturated Porous Media: A Multi-Component FEM Simulation Based on the Theory of Porous Media. In: Giovine, P. ; Mariano, P. M. ; Mortara, G. (Hrsg.) ; Giovine, P. ; Mariano, P. M. ; Mortara, G. (Hrsg.): Views on Microstructures in Granular Materials, Views on Microstructures in Granular Materials. Bd. 44. Cham : Springer International Publishing, 2020 — ISBN 978-3-030-49267-0, S. 157--183
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  BibTeX
  @incollection{Ricken.2020, abstract = {Bacterial methane oxidation in landfill cover soils, which turns the emitting methane caused by waste degradation into carbon dioxide, reduces the climate impact of landfill gas emissions significantly, since methane is estimated to have a global warming potential (GWP) of 25 over 100 years (GWP of CO2 = 1). To understand and forecast the biological processes, a Finite-Element Model (FEM) is developed to simulate the behavior of methanotrophic layers. A multiphasic continuum mechanical approach based on the extended Theory of Porous Media (eTPM) is chosen, providing a macroscopic, multi-component view on the bacterial progress including the relevant gas transport processes of diffusion and advection in porous media as well as bacterial driven conversion processes. The presented thermodynamically consistent model also considers energy production within the gas phase resulting from exothermic reactions. An experimental setup was developed to validate the model also in terms of temperature development via the thermal imaging technique.}, address = {Cham}, author = {Ricken, Tim and Thom, Andrea and Gehrke, Tobias and Denecke, Martin and Widmann, Renatus and Schulte, Marcel and Schmidt, Thorsten C.}, booktitle = {{Views on Microstructures in Granular Materials}}, doi = {\url{10.1007/978-3-030-49267-0{\textunderscore }8}}, editor = {Giovine, Pasquale and Mariano, Paolo Maria and Mortara, Giuseppe}, file = {0997f537-cb1a-44da-ae7b-ff9b663dd4b3:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\0997f537-cb1a-44da-ae7b-ff9b663dd4b3.pdf:pdf}, isbn = {978-3-030-49267-0}, pages = {157--183}, publisher = {{Springer International Publishing}}, title = {{Biological Driven Phase Transitions in Fully or Partly Saturated Porous Media: A Multi-Component FEM Simulation Based on the Theory of Porous Media}}, volume = 44, year = 2020 }
2019
1. Seyedpour, S. M. ; Janmaleki, M. ; Henning, C. ; Sanati-Nezhad, A. ; Ricken, T.: Contaminant transport in soil: A comparison of the Theory of Porous Media approach with the microfluidic visualisation. In: Science of The Total Environment, Science of The Total Environment. (2019)
  - BibTeX
  - Link
  BibTeX
  @article{Seyedpour.2019b, abstract = {Visualisation of the groundwater flow and contaminant transport can play a significant role for a better understanding of contaminant fate, which helps decision-makers and contaminated site planners to choose and implement the best remediation strategies. In this paper, a microfluidic chip coated with nanoclay was developed to mimic soil behaviour. Scanning electron microscopy (SEM) images and Fourier-transform infrared spectroscopy (FTIR) analysis confirmed that all the features and surfaces are coated with nanoclay. The change of contact angle for the native polydimethylsiloxane (PDMS) from 151° $\pm$ 4° to 73° $\pm$ 6° for modified ones is indicative of a considerable shift to hydrophilic behaviour. Moreover, the transport process in the developed chip was simulated utilising the Theory of Porous Media (TPM) and computational fluid dynamic (CFD) approaches. Although the results of both numerical approaches are in good agreement with experiments, the Root Mean Square Error (RMSE) of the predicted contaminant concentration by TPM at two observation points is less than that of CFD.}, author = {Seyedpour, S. M. and Janmaleki, M. and Henning, C. and Sanati-Nezhad, A. and Ricken, T.}, doi = {\url{10.1016/j.scitotenv.2019.05.095}}, file = {617c3cda-63ca-411d-8096-30f4c5b566f8:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\617c3cda-63ca-411d-8096-30f4c5b566f8.pdf:pdf}, issn = {0048-9697}, journal = {{Science of The Total Environment}}, title = {{Contaminant transport in soil: A comparison of the Theory of Porous Media approach with the microfluidic visualisation}}, url = {http://www.sciencedirect.com/science/article/pii/S0048969719321138}, year = 2019 }
  Link
  http://www.sciencedirect.com/science/article/pii/S0048969719321138
2. Drieschner, Martin ; Matthies, Hermann G. ; Hoang, Truong-Vinh ; v. Rosić, Bojana ; Ricken, Tim ; Henning, Carla ; Ostermeyer, Georg-Peter ; Müller, Michael ; u. a.: Analysis of polymorphic data uncertainties in engineering applications. In: GAMM-Mitteilungen, GAMM-Mitteilungen. Bd. 42 (2019), Nr. 2, S. e201900010
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  BibTeX
  @article{Drieschner.2019, author = {Drieschner, Martin and Matthies, Hermann G. and Hoang, Truong-Vinh and v. Rosi{\'c}, Bojana and Ricken, Tim and Henning, Carla and Ostermeyer, Georg-Peter and M{\"u}ller, Michael and Brumme, Stephan and Srisupattarawanit, Tarin and Weinberg, Kerstin and Korzeniowski, Tim F.}, doi = {\url{10.1002/gamm.201900010}}, file = {355cf233-e465-4565-82c2-ed0f50d9ac08:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\355cf233-e465-4565-82c2-ed0f50d9ac08.pdf:pdf}, journal = {{GAMM-Mitteilungen}}, number = 2, pages = {e201900010}, title = {{Analysis of polymorphic data uncertainties in engineering applications}}, volume = 42, year = 2019 }
3. Nisters, Carina ; Schröder, Jörg ; Niekamp, Rainer ; Ricken, Tim: The Taylor-least-squares time integrator scheme applied to tracer equations of a sea ice model. In: PAMM, PAMM. Bd. 19 (2019), Nr. 1, S. e201900473
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  BibTeX
  @article{Nisters.2019, abstract = {Abstract The viscous-plastic sea ice model based on [2] describes the motion of sea ice for scales of several thousand kilometers. The numerical model for the simulation of sea ice circulation and evolution over a seasonal cycle includes the consideration of the sea ice thickness and sea ice concentration. Transient advection equations describe the physical behavior of both thickness and concentration with the velocity of the sea ice as the coupling field. Recent research on a finite element implementation of the sea ice model is devoted to formulations based on the (mixed) Galerkin variational approach, compare to [1] and [6] for instance. Here, particular treatments are necessary regarding the stabilization of the complex numerical scheme, especially for the first-order advection equation. It is therefore suggested to utilize the mixed least-squares finite element method (LSFEM), which is well established in the branch of, e.g., fluid mechanics. A significant advantage of the method is its applicability to first-order systems. Thus, this method results in stable and robust formulations also for not self-adjoint operators like the tracer equations. Moreover, in [7], the authors provide a promising higher-order time integration scheme for transient advection equations denoted as Taylor-least-squares scheme, which is investigated in this article. The presented least-squares finite element formulation is based on the unsteady sea ice equations including two tracer equations of transient advection type. The numerical problem of a Box test case is investigated.}, author = {Nisters, Carina and Schr{\"o}der, J{\"o}rg and Niekamp, Rainer and Ricken, Tim}, doi = {\url{10.1002/pamm.201900473}}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {e201900473}, title = {{The Taylor-least-squares time integrator scheme applied to tracer equations of a sea ice model}}, volume = 19, year = 2019 }
4. Thom, Andrea ; Ricken, Tim: Towards a physical model of Antarctic sea ice microstructure including biogeochemical processes using the extended Theory of Porous Media. In: PAMM, PAMM. Bd. 19 (2019), Nr. 1, S. e201900285
  - BibTeX
  BibTeX
  @article{Thom.2019, abstract = {Abstract Predictive numerical climate models include an ocean modeling system as an important module, which comprises the components of ocean and sea ice physics as well as the coupled biogeochemical processes occuring in the ocean and sea ice, respectively. Whereas large-scale, physical sea ice models are well represented, a new thrust for climate modeling is to include the sea ice biogeochemistry (BGC) as a strong influencing factor. For that reason, a demanding challenge is to develop a numerical model for the sea ice microstructure, which considers all relevant physical parts, like the evolution of salinity, thermodynamic properties and mechanical deformation, as well as the biological and chemical conversion processes. The model should be able to quantify phytoplankton biomass, nutrient sources and utilization as well as carbon content and export in connection to the underlying physical and biogeochemical driven mechanisms. A thermodynamically consistent derived continuum mechanical model is developed and prepared by means of a standard GALERKIN procedure to be implemented and solved with the finite element method (FEM). The governing equations and constitutive relations are set up in the framework of the homogenization approach of the extended Theory of Porous Media (eTPM).}, author = {Thom, Andrea and Ricken, Tim}, doi = {\url{10.1002/pamm.201900285}}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {e201900285}, title = {{Towards a physical model of Antarctic sea ice microstructure including biogeochemical processes using the extended Theory of Porous Media}}, volume = 19, year = 2019 }
5. Lambers, Lena ; Ricken, Tim ; König, Matthias: Model Order Reduction (MOR) of Function--Perfusion--Growth Simulation in the Human Fatty Liver via Artificial Neural Network (ANN). In: PAMM, PAMM. Bd. 19 (2019), Nr. 1
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  @article{Lambers.2019, author = {Lambers, Lena and Ricken, Tim and K{\"o}nig, Matthias}, doi = {10.1002/pamm.201900429}, issn = {1617-7061}, journal = {PAMM}, number = 1, title = {Model Order Reduction (MOR) of Function--Perfusion--Growth Simulation in the Human Fatty Liver via Artificial Neural Network (ANN)}, volume = 19, year = 2019 }
6. Lambers, L ; Ricken, T ; König, M: A multiscale and multiphase model for the description of function-perfusion processes in the human liver. In: Advances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications: Proceedings of the 7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa, Advances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications: Proceedings of the 7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa : CRC Press, 2019, S. 304
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  BibTeX
  @inproceedings{lambers2019multiscale, author = {Lambers, L and Ricken, T and K{\"o}nig, M}, booktitle = {Advances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications: Proceedings of the 7th International Conference on Structural Engineering, Mechanics and Computation (SEMC 2019), September 2-4, 2019, Cape Town, South Africa}, organization = {CRC Press}, pages = 304, title = {A multiscale and multiphase model for the description of function-perfusion processes in the human liver}, year = 2019 }
7. Schmidt, Albrecht ; Henning, Carla ; Herbrandt, Swetlana ; Könke, Carsten ; Ickstadt, Katja ; Ricken, Tim ; Lahmer, Tom: Numerical studies of earth structure assessment via the theory of porous media using fuzzy probability based random field material descriptions. In: GAMM-Mitteilungen, GAMM-Mitteilungen. Bd. 42 (2019), Nr. 1, S. e201900007
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  BibTeX
  @article{Schmidt.2019, author = {Schmidt, Albrecht and Henning, Carla and Herbrandt, Swetlana and K{\"o}nke, Carsten and Ickstadt, Katja and Ricken, Tim and Lahmer, Tom}, doi = {\url{10.1002/gamm.201900007}}, file = {e441a486-70fd-4e37-bd9a-a727ba77f9cb:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\e441a486-70fd-4e37-bd9a-a727ba77f9cb.pdf:pdf}, journal = {{GAMM-Mitteilungen}}, number = 1, pages = {e201900007}, title = {{Numerical studies of earth structure assessment via the theory of porous media using fuzzy probability based random field material descriptions}}, volume = 42, year = 2019 }
8. Egli, Franziska ; Ricken, Tim: On Osmotic Pressure in Hyperelastic Biphasic Fiber--Reinforced Articular Cartilage. In: PAMM, PAMM. Bd. 19 (2019), Nr. 1
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  BibTeX
  @article{Egli.2019, author = {Egli, Franziska and Ricken, Tim}, doi = {\url{10.1002/pamm.201900355}}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, title = {{On Osmotic Pressure in Hyperelastic Biphasic Fiber--Reinforced Articular Cartilage}}, volume = 19, year = 2019 }
9. Keller, Karsten ; Wallmersperger, Thomas ; Ricken, Tim: An Overview of Simulated Hydrogel Behaviour under Various Kinds of Stimulation. In: PAMM, PAMM. Bd. 19 (2019), Nr. 1, S. e201900487
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  @article{Keller.2019, abstract = {Abstract Polyelectrolytic gels placed in aqueous solution show effects under various kinds of stimulation. The stimuli could be e.g. of chemical, electrical, mechanical or thermal nature. The hydrogels react via uptake or delivery of mobile ions and solvent, and they show enormous swelling capabilities. This multifunctional behaviour is potentially attractive for chemo-electro-mechanical energy converters or for the use as actuators or sensors. In the present research, anionic and cationic hydrogels are investigated, which means that the polymer network contains anionic or cationic bound charged groups. The chemical stimulation is applied by a change of boundary conditions in the solution bath for the salt concentrations. The electrical stimulus is realized by incorporating electrodes between which an electric potential difference is applied. The mechanical stimulus is realized by prescribed displacements at a boundary of the hydrogel itself. The thermal stimulus is applied as transient temperature change over the whole domain, incorporating temperature-dependent material parameters and osmotic pressure differences. The reactions of the hydrogel differ depending on the sensitivity of the gel to the applied stimulus. The incorporated chemo-electro-mechanical model enhanced with thermal dependencies is capable of giving local concentrations, electric potential and mechanical displacements.}, author = {Keller, Karsten and Wallmersperger, Thomas and Ricken, Tim}, doi = {\url{10.1002/pamm.201900487}}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {e201900487}, title = {{An Overview of Simulated Hydrogel Behaviour under Various Kinds of Stimulation}}, volume = 19, year = 2019 }
10. Henning, Carla ; Ricken, Tim: Polymorphic Uncertainty Quantification of Computational Soil and Earth Structure Simulations via the Variational Sensitivity Analysis. In: PAMM, PAMM. Bd. 19 (2019), Nr. 1, S. e201900289
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  @article{Henning.2019, abstract = {Abstract Due to the high natural variability of mechanical properties in soil, comparatively high safety factors are still used for the dimensioning of earth structures. Back in the 1970s, probabilistic concepts were recommended as the technical standard for geotechnical applications. However, their dissemination failed because of the high computation costs on one hand and, on the other hand, often not enough data being available to carry out such analyses. By means of increasing computing power and enhanced mathematical models, a better understanding of the nature and influence of the uncertainties and errors could help to develop a more reliable risk assessment and to reduce inefficient safety factors. For this reason, we perform a research project within the priority program SPP 1886, installed by the DFG and focused on polymorphic uncertainty quantification. In the present subproject (SP 12), the focus is driven on quantification and assessment of polymorphic uncertainties in computational simulations of earth structures, especially for fluid-saturated soils. To describe the strongly coupled and transient solid-fluid response behavior, the Theory of Porous Media (TPM) is used and solved via the Finite Element Method (FEM). The goal is to overcome the above mentioned two problems by providing suitable numerical methods. Motivated by structural optimization research, the Variational Sensitivity Analysis (VSA) provides detailed prior information about the current equilibrium state for subsequent analyzes. On its basis, the information for which parameters and in which areas of the simulation domain a more detailed investigation is required can be obtained in advance. The method enables an immediate decision support, e.g. for site investigators or researchers. Not only the computational effort but also the applicability to any arbitrary FE-Model are great advantages of this approach.}, author = {Henning, Carla and Ricken, Tim}, doi = {\url{10.1002/pamm.201900289}}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {e201900289}, title = {{Polymorphic Uncertainty Quantification of Computational Soil and Earth Structure Simulations via the Variational Sensitivity Analysis}}, volume = 19, year = 2019 }
11. Mielke, A. ; Ricken, T.: Evaluating Artificial Neural Networks and Quantum Computing for Solving Mechanical Boundary Value Problems. In: Zingoni, A (Hrsg.) ; Zingoni, A (Hrsg.): Advances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications, Advances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications. PO box 11320, Leiden, 2301 EH, Netherlands : CRC Press-Balkema, 2019. — 7th International Conference on Structural Engineering, Mechanics and Computation (SEMC), Cape Town, SOUTH AFRICA, SEP 02-04, 2019 — ISBN 978-0-429-42650-6; 978-1-138-38696-9, S. 537–542
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  @inproceedings{ISI:000504648100094, abstract = {Artificial neural networks (ANNs) and quantum computing (QC) have both received rapidly increasing interest in recent years for several reasons. Their roles in the mechanics community remain a subject of ongoing debate and research. ANNs have successfully been employed on problems previously considered unsolvable (Silver et al. 2016), as well as on practical and illustrative problems especially in the image recognition domain (Szegedy et al. 2013, among others). The most straightforward way to interpret the behavior of ANNs is focusing on their ability to approximate any continuous function to arbitrary precision (Kreinovich 1991). The adjustment to a given function happens automatically except for hyperparameters, such as the number of hidden layers or the learning rate, which remain constant during training. This makes them a perfect tool for reducing computational cost in otherwise time-consuming simulations. Quantum computing on the other hand has received some publicity in 2018 mainly because of a paper published by Google Quantum A.I. Lab scientists defining quantum supremacy (Boixo & Isakov 2018), where it is shown that a fully working universal quantum computer with only 50 qubits will outperform any near-term realizable classical supercomputer on certain tasks. This publicationwas followed up by Google revealing Bristlecone (Kelly 2018), a quantum processor consisting of 72 qubits. While many interesting quantum algorithms have proven to run polynomially or even exponentially faster than their classical analogons (Montanaro 2016), these results only hold true for a decoherence-free machine. Therefore, to actually achieve quantum supremacy, quantum error correction schemes need to be implemented, requiring several physical qubits to make up a single logical qubit suitable for computation.}, address = {PO box 11320, Leiden, 2301 EH, Netherlands}, affiliation = {{Mielke, A (Reprint Author), Univ Stuttgart, Inst Mech Struct Anal \& Dynam ISD, Stuttgart, Germany. Mielke, A.; Ricken, T., Univ Stuttgart, Inst Mech Struct Anal \& Dynam ISD, Stuttgart, Germany.}}, author = {Mielke, A. and Ricken, T.}, booktitle = {Advances in Engineering Materials, Structures and Systems: Innovations, Mechanics and Applications}, da = {{2020-01-17}}, doc-delivery-number = {{BO2AY}}, editor = {{Zingoni, A}}, isbn = {978-0-429-42650-6; 978-1-138-38696-9}, language = {English}, note = {7th International Conference on Structural Engineering, Mechanics and Computation (SEMC), Cape Town, SOUTH AFRICA, SEP 02-04, 2019}, number-of-cited-references = {{26}}, organization = {Natl Res Fdn S Africa; S African Natl Roads Agcy Ltd; ADINA R \& D Inc}, pages = {537-542}, publisher = {CRC Press-Balkema}, research-areas = {{Engineering; Materials Science}}, times-cited = {{0}}, title = {Evaluating Artificial Neural Networks and Quantum Computing for Solving Mechanical Boundary Value Problems}, type = {Proceedings Paper}, unique-id = {{ISI:000504648100094}}, usage-count-last-180-days = {{0}}, usage-count-since-2013 = {{0}}, web-of-science-categories = {{Engineering, Civil; Materials Science, Multidisciplinary}}, year = 2019 }
12. Ricken, Tim ; Lambers, Lena: On computational approaches of liver lobule function and perfusion simulation. In: GAMM-Mitteilungen, GAMM-Mitteilungen. Bd. 42 (2019), Nr. 4, S. e201900016
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  @article{Ricken.2019, author = {Ricken, Tim and Lambers, Lena}, doi = {\url{10.1002/gamm.201900016}}, file = {781cd0a8-b533-4c24-9814-a56aa2eaef6b:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\781cd0a8-b533-4c24-9814-a56aa2eaef6b.pdf:pdf}, journal = {{GAMM-Mitteilungen}}, number = 4, pages = {e201900016}, title = {{On computational approaches of liver lobule function and perfusion simulation}}, volume = 42, year = 2019 }
13. Seyedpour, S. M. ; Kirmizakis, P. ; Brennan, P. ; Doherty, R. ; Ricken, T.: Optimal remediation design and simulation of groundwater flow coupled to contaminant transport using genetic algorithm and radial point collocation method (RPCM). In: Science of The Total Environment, Science of The Total Environment. Bd. 669 (2019), S. 389--399
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  @article{Seyedpour.2019, abstract = {The simulation-optimisation models of groundwater and contaminant transport can be a powerful tool in the management of groundwater resources and remediation design. In this study, using Multiquadratic Radial Basis Function (MRBF) a coupled groundwater flow and reactive transport of contaminant and oxidant was developed in the framework of the Meshfree method. The parameter analysis has determined the optimum shape parameter (0.97), and the results of the model were compared with a physical sandbox model which were in good agreement. The genetic algorithm approach was used to find the optimum design of the remediation using permanganate as an oxidant. To find the optimum design we considered two objectives and two constraints. The results revealed that the breakthrough of contaminant to the downstream area of interest and the concentration of the contaminant in this area is reduced significantly with optimisation.}, author = {Seyedpour, S. M. and Kirmizakis, P. and Brennan, P. and Doherty, R. and Ricken, T.}, doi = {\url{10.1016/j.scitotenv.2019.01.409}}, file = {4635e3ac-8346-4dd3-a776-916977bfc97d:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\4635e3ac-8346-4dd3-a776-916977bfc97d.pdf:pdf}, issn = {0048-9697}, journal = {{Science of The Total Environment}}, pages = {389--399}, title = {{Optimal remediation design and simulation of groundwater flow coupled to contaminant transport using genetic algorithm and radial point collocation method (RPCM)}}, url = {http://www.sciencedirect.com/science/article/pii/S0048969719304565}, volume = 669, year = 2019 }
  Link
  http://www.sciencedirect.com/science/article/pii/S0048969719304565
14. Pivovarov, Dmytro ; Willner, Kai ; Steinmann, Paul ; Brumme, Stephan ; Müller, Michael ; Srisupattarawanit, Tarin ; Ostermeyer, Georg-Peter ; Henning, Carla ; u. a.: Challenges of order reduction techniques for problems involving polymorphic uncertainty. In: GAMM-Mitteilungen, GAMM-Mitteilungen. Bd. 42 (2019), Nr. 2, S. e201900011
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  @article{Pivovarov.2019, author = {Pivovarov, Dmytro and Willner, Kai and Steinmann, Paul and Brumme, Stephan and M{\"u}ller, Michael and Srisupattarawanit, Tarin and Ostermeyer, Georg-Peter and Henning, Carla and Ricken, Tim and Kastian, Steffen and Reese, Stefanie and Moser, Dieter and Grasedyck, Lars and Biehler, Jonas and Pfaller, Martin and Wall, Wolfgang and Kohlsche, Thomas and von Estorff, Otto and Gruhlke, Robert and Eigel, Martin and Ehre, Max and Papaioannou, Iason and Straub, Daniel and Leyendecker, Sigrid}, doi = {\url{10.1002/gamm.201900011}}, file = {2cb09582-5e6d-4ab6-bd5b-ba9c24110f9f:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\2cb09582-5e6d-4ab6-bd5b-ba9c24110f9f.pdf:pdf}, journal = {{GAMM-Mitteilungen}}, number = 2, pages = {e201900011}, title = {{Challenges of order reduction techniques for problems involving polymorphic uncertainty}}, volume = 42, year = 2019 }
15. Bartel, Florian ; Ricken, Tim ; Schröder, Jörg ; Bluhm, Joachim: Application of Artificial Neural Network accelerating a porous media FE2 homogenization scheme. In: PAMM, PAMM. Bd. 19 (2019), Nr. 1, S. e201900381
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  @article{Bartel.2019, abstract = {Abstract Multiscale techniques, which include information of discrete lower level substructures of real material, are state of the art methods of current researches. This technology has the advantage of achieving more accurate results, by imaging the real geometry information from the microscopic level. In addition, it provides the opportunity to design a certain microstructure which fulfills the specific requirements at a macroscopic level. The drawback lies on the increasing computational effort. Simulation of a 3-dimensional, nonlinear, time-dependent, coupled, two-scale problem with industrial relevance, could cause unacceptable runtimes. There are several strategies to overcome this disadvantage, such as parallelization, analytical derivatives and various surrogate models. This contribution shows the feasibility of storing microstructural information in an Artificial Neural Network, in order to reduce computational runtime.}, author = {Bartel, Florian and Ricken, Tim and Schr{\"o}der, J{\"o}rg and Bluhm, Joachim}, doi = {\url{10.1002/pamm.201900381}}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {e201900381}, title = {{Application of Artificial Neural Network accelerating a porous media FE2 homogenization scheme}}, volume = 19, year = 2019 }
16. Mielke, André ; Ricken, Tim: Evaluating Artificial Neural Networks and Quantum Computing for Mechanics. In: PAMM, PAMM. Bd. 19 (2019), Nr. 1, S. e201900470
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  @article{doi:10.1002/pamm.201900470, abstract = {Abstract The popularization of Machine Learning (ML) and the advent of Noisy Intermediate-Scale Quantum (NISQ) devices for Quantum Computing (QC) sparked new inspiration for the search for techniques reducing computation time in mechanics. We evaluate artificial neural networks (ANNs) as candidates for creating computationally fast surrogate models for otherwise time-consuming simulations, using a multiscale and multiphase model describing processes in the human liver. We also give a short overview of interesting quantum-enhanced algorithms capable of reducing computational cost in parts of complex simulations.}, author = {Mielke, André and Ricken, Tim}, doi = {10.1002/pamm.201900470}, eprint = {https://onlinelibrary.wiley.com/doi/pdf/10.1002/pamm.201900470}, journal = {PAMM}, number = 1, pages = {e201900470}, title = {Evaluating Artificial Neural Networks and Quantum Computing for Mechanics}, url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/pamm.201900470}, volume = 19, year = 2019 }
  Link
  https://onlinelibrary.wiley.com/doi/abs/10.1002/pamm.201900470
2018
1. Moj, Lukas ; Ricken, Tim ; Foppe, Manuel ; Deike, Rüdiger: Numerical simulation and validation of a solidification experiment using a continuum mechanical two--phase/--scale model. In: PAMM, PAMM. Bd. 17 (2018), Nr. 1, S. 611--612
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  @article{Moj.2018, abstract = {Abstract A numerical simulation of a solidification experiment is presented. The experimental setup consists of an empty screwed up mould, which is filled up with molten steel and cools down due to atmospheric conditions. During the cooling process, the temperature at the centre as well as the shrinkage at the narrow side, respectively, have been recorded. The simulation has been run via the software ANSYS modified by specific provided programmer interfaces, the User Programmable Features (UPFs). All required temperature dependent material parameters have been provided by ThyssenKrupp Steel Europe. (? 2017 Wiley?VCH Verlag GmbH {\&} Co. KGaA, Weinheim)}, author = {Moj, Lukas and Ricken, Tim and Foppe, Manuel and Deike, R{\"u}diger}, doi = {\url{10.1002/pamm.201710275}}, file = {https://doi.org/10.1002/pamm.201710275}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {611--612}, title = {{Numerical simulation and validation of a solidification experiment using a continuum mechanical two--phase/--scale model}}, volume = 17, year = 2018 }
2. Hopkins, Gary ; Skatulla, S. ; Moj, L. ; Ricken, T. ; Ntusi, N. ; Meintjes, E.: A biphasic model for full cycle simulation of the human heart aimed at rheumatic heart disease. In: Computers & Structures, Computers & Structures. (2018)
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  @article{Hopkins.2018, abstract = {Rheumatic heart disease (RHD) is identified as a serious health concern in developing countries, specifically amongst young individuals, accounting for between 250 000 and 1.4 million deaths annually. As such, attention is initially placed on the importance of the development of a cardiac analysis toolbox with functionality for pathophysiological analysis of the disease. Subsequently, in order to develop a toolbox to further the understanding of the mechanisms of the disease as linked to changes in the cytoskeletal architecture and hypertrophy of cardiac myocytes, a continuum bi-phasic model applicable to cardiac tissue is formulated based on the theory of porous media (TPM). This makes it possible to account for interactions and contributions of multiple phases of constituent materials as well as concentrations of solved components, which in computational cardiac modelling are the solid phase -- the cardiac tissue -- and the liquid phase -- blood and interstitial fluid. Therefore, subsequent attention is paid to the cardiac model development in order to implement a sound base on which to add strain- and nutrient-driven phase transition, in addition to a nutrient phase contained within the liquid phase. To this end, based on thermodynamical restrictions, constitutive relations are proposed for stress, permeability, seepage velocity and interaction forces. The approach is implemented in the in-house computational cardiac mechanics toolbox SESKA which supports finite element as well as Element-free Galerkin-based approximations. This paper considers the passive and active non-linear elastic material behaviour of the myocardium of the left ventricle coupled with porous media theory, along with an additional coupling to the haemodynamics of the circulatory system, facilitating modelling of the full cardiac cycle. In order to illustrate the potential and efficacy of the approach with qualitative results, a human heart affected by RHD is investigated, making use of cardiovascular magnetic resonance scans taken over a period of two years to generate realistic 3D computer models.}, author = {Hopkins, Gary and Skatulla, S. and Moj, L. and Ricken, T. and Ntusi, N. and Meintjes, E.}, doi = {\url{10.1016/j.compstruc.2018.02.012}}, file = {0df861fd-9a2f-4fe1-ad6c-b63c1a592fb8:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\0df861fd-9a2f-4fe1-ad6c-b63c1a592fb8.pdf:pdf}, issn = {0045-7949}, journal = {{Computers {\&} Structures}}, title = {{A biphasic model for full cycle simulation of the human heart aimed at rheumatic heart disease}}, url = {http://www.sciencedirect.com/science/article/pii/S0045794917306387}, year = 2018 }
  Link
  http://www.sciencedirect.com/science/article/pii/S0045794917306387
3. Bartel, Florian ; Ricken, Tim ; Schröder, Jörg ; Bluhm, Joachim: On efficient computation of 3-d simulation within TPM 2 -Framework. In: PAMM, PAMM. Bd. 18 (2018), Nr. 1, S. e201800332
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  @article{Bartel.2018, author = {Bartel, Florian and Ricken, Tim and Schr{\"o}der, J{\"o}rg and Bluhm, Joachim}, doi = {\url{10.1002/pamm.201800332}}, file = {cfcb230a-59a8-48fe-b5df-1827ba34ee3d:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\cfcb230a-59a8-48fe-b5df-1827ba34ee3d.pdf:pdf}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {e201800332}, title = {{On efficient computation of 3-d simulation within TPM 2 -Framework}}, volume = 18, year = 2018 }
4. Lambers, Lena ; Waschinsky, Navina ; Ricken, Tim: On a Multi-Scale and Multi-Phase Model of Paracetamol-induced Hepatotoxicity for Human Liver. In: PAMM, PAMM. Bd. 18 (2018), Nr. 1, S. e201800454
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  @article{Lambers.2018, author = {Lambers, Lena and Waschinsky, Navina and Ricken, Tim}, doi = {10.1002/pamm.201800454}, file = {Lambers, Waschinsky et al 2018 - On a Multi-Scale and Multi-Phase.pdf}, issn = {1617-7061}, journal = {PAMM}, number = 1, pages = {e201800454}, title = {On a Multi-Scale and Multi-Phase Model of Paracetamol-induced Hepatotoxicity for Human Liver}, volume = 18, year = 2018 }
5. Bongert, Markus ; Wüst, Jan ; Geller, Marius ; Schlömicher, Markus ; Ricken, Tim ; Nicolas, Volkmar ; Strauch, Justus: Comparison of two biological aortic valve prostheses inside patient-specific aorta model by bi-directional fluid-structure interaction. In: Current Directions in Biomedical Engineering, Current Directions in Biomedical Engineering. Bd. 4 (2018), Nr. 1, S. 59--62
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  @article{Bongert.2018, author = {Bongert, Markus and W{\"u}st, Jan and Geller, Marius and Schl{\"o}micher, Markus and Ricken, Tim and Nicolas, Volkmar and Strauch, Justus}, doi = {\url{10.1515/cdbme-2018-0015}}, file = {df9c276c-42c9-4722-ab5e-3afc78659e4f:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\df9c276c-42c9-4722-ab5e-3afc78659e4f.pdf:pdf}, journal = {{Current Directions in Biomedical Engineering}}, number = 1, pages = {59--62}, title = {{Comparison of two biological aortic valve prostheses inside patient-specific aorta model by bi-directional fluid-structure interaction}}, volume = 4, year = 2018 }
6. Bartel, Florian ; Ricken, Tim ; Schröder, Jörg ; Bluhm, Joachim: Microstructural influence on macroscopic response regarding fluid flow through porous media applying TPM2--Method. In: PAMM, PAMM. Bd. 17 (2018), Nr. 1, S. 577--578
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  @article{Bartel.2018b, abstract = {Abstract Thanks to the advancements in the digital era we are able to capture naturally grown and artificially manufactured microstructures with various scanning devices like CT and MRT and can transfer the digital image data to finite element models. In addition, there has been a permanent improvement in the quality of additive reproduction technology. Looking at the biomedical industry producing organic parts, porous materials saturated with fluids play an important role. For this reason, we also have to develop appropriate simulation technology providing a description for porous materials regarding the underlying microstructure. This contribution presents a numerical experiment for the flow through a porous body with different underlying microstructures applying the TPM2?Method. The different macroscopic behavior for the displacements, pressure distribution, and volumetric fluid flow for an isotropic and two differently orientated anisotropic microstructures are shown in section 3. (? 2017 Wiley?VCH Verlag GmbH {\&} Co. KGaA, Weinheim)}, author = {Bartel, Florian and Ricken, Tim and Schr{\"o}der, J{\"o}rg and Bluhm, Joachim}, doi = {\url{10.1002/pamm.201710258}}, file = {https://doi.org/10.1002/pamm.201710258}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {577--578}, title = {{Microstructural influence on macroscopic response regarding fluid flow through porous media applying TPM2--Method}}, volume = 17, year = 2018 }
7. Henning, Carla ; Ricken, Tim: Polymorphic uncertainty quantification for stability analysis of fluid saturated soil and earth structures. In: PAMM, PAMM. Bd. 17 (2018), Nr. 1, S. 59--62
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  @article{Henning.2018, abstract = {Abstract Nowadays, numerical simulations enable the description of mechanical problems in many application fields, e.g. in soil or solid mechanics. During the process of physical and computational modeling, a lot of theoretical model approaches and geometrical approximations are sources of errors. These can be distinguished into aleatoric (e.g. model parameters) and epistemic (e.g. numerical approximation) uncertainties. In order to get access to a risk assessment, these uncertainties and errors must be captured and quantified. For this aim a new priority program SPP 1886 has been installed by the DFG which focuses on the so called polymorphic uncertainty quantification. In our subproject, which is part of the SPP 1886 (sp12), the focus is driven on quantification and assessment of polymorphic uncertainties in computational simulations of earth structures, especially for fluid?saturated soils. To describe the strongly coupled solid?fluid response behavior, the theory of porous media (TPM) will be used and prepared within the framework of the finite element method (FEM) for the numerical solution of initial and boundary value problems [2, 3]. To capture the impacts of different uncertainties on computational results, two promising approaches of analytical and stochastic sensitivity analysis will enhance the deterministic structural analysis [6?8]. A simple consolidation problem already provided a high sensitivity in the computational results towards variation of material parameters and initial values. The variational and probabilistic sensitivity analyses enable to quantify these sensitivities. The variational sensitivities are used as a tool for optimization procedures and capture the impact of different parameters as continuous functions. An advantage is the accurate approximation of the solution space and the efficient computation time, a disadvantage lies in the analytical derivation and algorithmic implementation. In the probabilistic sensitivity analysis from the field of statistics, the expense only increases proportionally to the problems dimension. Instead of a constant value, the model parameters are defined as probability distribution, which provides random values. Thus, a set of solution data is built up by several cycles of the simulation. Different approaches of the Bayes statistics will enable to receive accurate information with just a few simulations. The overall objective is the development of more efficient methods and tools for the sizing of earth structures in the long?run. (? 2017 Wiley?VCH Verlag GmbH {\&} Co. KGaA, Weinheim)}, author = {Henning, Carla and Ricken, Tim}, doi = {\url{10.1002/pamm.201710018}}, file = {http://dx.doi.org/10.1002/pamm.201710018}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {59--62}, title = {{Polymorphic uncertainty quantification for stability analysis of fluid saturated soil and earth structures}}, volume = 17, year = 2018 }
8. Ricken, Tim ; Waschinsky, Navina ; Werner, Daniel: Simulation of Steatosis Zonation in Liver Lobule---A Continuummechanical Bi-Scale, Tri-Phasic, Multi-Component Approach. In: Peter Wriggers, Prof. Thomas Lenarz (Hrsg.) ; Peter Wriggers, Prof. Thomas Lenarz (Hrsg.): Biomedical Technology, Biomedical Technology : Springer International Publishing, 2018 — ISBN 978-3-319-59547-4
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  @incollection{Ricken.2018, author = {Ricken, Tim and Waschinsky, Navina and Werner, Daniel}, booktitle = {{Biomedical Technology}}, doi = {\url{10.1007/978-3-319-59548-1{\textunderscore }2}}, editor = {{Peter Wriggers, Prof. Thomas Lenarz}}, file = {6c9fc2fb-07e6-4dd6-828e-6f745d9d91f4:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\6c9fc2fb-07e6-4dd6-828e-6f745d9d91f4.pdf:pdf}, isbn = {978-3-319-59547-4}, publisher = {{Springer International Publishing}}, title = {{Simulation of Steatosis Zonation in Liver Lobule---A Continuummechanical Bi-Scale, Tri-Phasic, Multi-Component Approach}}, year = 2018 }
9. Waschinsky, Navina ; Werner, Daniel ; Ricken, Tim ; Dahmen, Uta ; Dirsch, Olaf: On a Tri--Scale and Multiphase Model for the Description of Perfusion coupled to Fat Growth Effects in Liver Tissue. In: PAMM, PAMM. Bd. 17 (2018), Nr. 1, S. 227--228
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  @article{Waschinsky.2018, abstract = {Abstract In the European Union, fatty degeneration of the liver is a major problem in human health care. Approximately 20{\%} to 30{\%} of individuals in Western countries have a non?alcoholic fatty liver disease (NAFLD). The high number of people concerned can be explained by the high sensitivity of the liver due to negative environmental influences as addiction to high fat diets or alcohol consumption. High fat diets are the leading cause for NAFLD (steatosis), which is characterized by an accumulation of lipid droplets in the liver tissue. The growing fat has a high impact on the perfusion of the blood through the liver. The anatomy of the organ is characterized by a complex vascular system which changes on the different scales from a vascular branching tree to micro vessels, called sinusoids, in liver lobules. To capture the interplay between fat deposition arising in the microstructure and the perfusion on the organ scale it is important to couple the processes on each scale. For this we present a computational model for the human liver which is composed of three coupled sub models for the organ, lobule and cell scale. Due to the complexity of the organ we apply a multi?component/tri?phasic/tri?scale approach, which is founded on the publication of Ricken et al. [2], coupling all relevant aspects to visualize the coupling between the fat metabolism and the hepatic perfusion. (? 2017 Wiley?VCH Verlag GmbH {\&} Co. KGaA, Weinheim)}, author = {Waschinsky, Navina and Werner, Daniel and Ricken, Tim and Dahmen, Uta and Dirsch, Olaf}, doi = {\url{10.1002/pamm.201710083}}, file = {https://doi.org/10.1002/pamm.201710083}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {227--228}, title = {{On a Tri--Scale and Multiphase Model for the Description of Perfusion coupled to Fat Growth Effects in Liver Tissue}}, volume = 17, year = 2018 }
10. Schröder, Jörg ; Nisters, Carina ; Ricken, Tim: On a least-squares finite element formulation for sea ice dynamics. In: PAMM, PAMM. Bd. 18 (2018), Nr. 1, S. e201800156
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  @article{Schroder.2018, author = {Schr{\"o}der, J{\"o}rg and Nisters, Carina and Ricken, Tim}, doi = {\url{10.1002/pamm.201800156}}, file = {03652605-825b-4b73-b0e1-beb61474ffd1:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\03652605-825b-4b73-b0e1-beb61474ffd1.pdf:pdf}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {e201800156}, title = {{On a least-squares finite element formulation for sea ice dynamics}}, volume = 18, year = 2018 }
11. Wang, Xiaogang ; Eriksson, Thomas S.E. ; Ricken, Tim ; Pierce, David M.: On incorporating osmotic prestretch/prestress in image-driven finite element simulations of cartilage. In: Journal of the Mechanical Behavior of Biomedical Materials, Journal of the Mechanical Behavior of Biomedical Materials. Bd. 86 (2018), S. 409--422
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  @article{Wang.2018, author = {Wang, Xiaogang and Eriksson, Thomas S.E. and Ricken, Tim and Pierce, David M.}, doi = {\url{10.1016/j.jmbbm.2018.06.014}}, file = {http://www.sciencedirect.com/science/article/pii/S1751616118306003}, issn = {1751-6161}, journal = {{Journal of the Mechanical Behavior of Biomedical Materials}}, pages = {409--422}, title = {{On incorporating osmotic prestretch/prestress in image-driven finite element simulations of cartilage}}, volume = 86, year = 2018 }
12. Pierce, D. M. ; Ricken, T. ; Neu, C. P.: Chapter 4 - Image-Driven Constitutive Modeling for FE-Based Simulation of Soft Tissue Biomechanics. In: Cerrolaza, M. ; Shefelbine, S. J. ; Garzón-Alvarado, D. (Hrsg.) ; Cerrolaza, M. ; Shefelbine, S. J. ; Garzón-Alvarado, D. (Hrsg.): Numerical Methods and Advanced Simulation in Biomechanics and Biological Processes, Numerical Methods and Advanced Simulation in Biomechanics and Biological Processes. London : Academic Press and Elsevier/AP Academic Press an imprint of Elsevier, 2018 — ISBN 978-0-12-811718-7, S. 55--76
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  @incollection{Pierce.2018, abstract = {Abstract Both computational mechanics and medical imaging play an increasingly significant role in the study of biological systems at the scales of the organism, organ system, organ, tissue, cell, and molecule. Synergies among fundamental image-based experiments, new mathematical models, and computational methods enable studies of numerous phenomena and processes, e.g.,~microphysical (mechanobiological) cellular stimuli and response, structure-function relationships in tissues, surgical interventions, organ and tissue integrity, disease initiation and progression, and engineered tissue replacements. In this chapter, we explore the use of continuum modeling in a finite element framework that is suitable for the study of complex biological tissues and engineered systems. Important to this framework is the integration of continuum mechanical modeling with image-based data acquisition. Imaging can provide a noninvasive assessment of tissues and materials, allowing for the generation of data that is minimally influenced by the acquisition method, and that can guide material parameter selection, define boundary conditions or morphology, or enable precise validation studies. We present complex models and experimental approaches, using articular cartilage as a primary study system, that can be readily expanded to a broad range of soft biological tissues and engineered materials. Additionally, we discuss the use of imaging to acquire measures of geometry, morphology, diffusion, strain, and material properties.}, address = {London}, author = {Pierce, D. M. and Ricken, T. and Neu, C. P.}, booktitle = {{Numerical Methods and Advanced Simulation in Biomechanics and Biological Processes}}, doi = {\url{10.1016/B978-0-12-811718-7.00004-6}}, editor = {Cerrolaza, Miguel and Shefelbine, Sandra J. and Garz{\'o}n-Alvarado, Diego}, file = {a8585ef9-d527-456d-83e6-08a5ac8f9d86:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\a8585ef9-d527-456d-83e6-08a5ac8f9d86.pdf:pdf}, isbn = {978-0-12-811718-7}, pages = {55--76}, publisher = {{Academic Press} and {Elsevier/AP Academic Press an imprint of Elsevier}}, title = {{Chapter 4 - Image-Driven Constitutive Modeling for FE-Based Simulation of Soft Tissue Biomechanics}}, year = 2018 }
13. Thom, Andrea ; Ricken, Tim ; Koßler, Marvin ; Gehrke, Tobias ; Denecke, Martin ; Widmann, Renatus ; Schulte, Marcel ; Schmidt, Thorsten C.: Numerical investigations of diffusion coefficients in the context of multi-component gas transport within the Theory of Porous Media. In: PAMM, PAMM. Bd. 18 (2018), Nr. 1, S. e201800446
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  @article{Thom.2018, abstract = {Abstract In order to simulate methane oxidation within landfill covers in changing environmental conditions, a computational approach via the extended Theory of Porous Media (eTPM) was created. Its purpose is to gain an overall view on the ongoing processes such as concentration progression of methane, oxygen, carbon dioxide and nitrogen. For that, advective and diffusive transport mechanisms as well as energy production from the exothermic oxidation reaction are considered. Regarding the diffusive gas transport different approaches to model the diffusion coefficient are made use of.}, author = {Thom, Andrea and Ricken, Tim and Ko{\ss}ler, Marvin and Gehrke, Tobias and Denecke, Martin and Widmann, Renatus and Schulte, Marcel and Schmidt, Thorsten C.}, doi = {\url{10.1002/pamm.201800446}}, file = {18d6e48a-c4b9-4055-afae-3739230675f4:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\18d6e48a-c4b9-4055-afae-3739230675f4.pdf:pdf}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {e201800446}, title = {{Numerical investigations of diffusion coefficients in the context of multi-component gas transport within the Theory of Porous Media}}, volume = 18, year = 2018 }
2017
1. Schulte, Marcel ; Jochmann, Maik A. ; Gehrke, Tobias ; Thom, Andrea ; Ricken, Tim ; Denecke, Martin ; Schmidt, Torsten C.: Characterization of methane oxidation in a simulated landfill cover system by comparing molecular and stable isotope mass balances. In: Waste Management, Waste Management. Bd. 69 (2017), S. 281--288
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  @article{Schulte.2017, abstract = {Biological methane oxidation may be regarded as a method of aftercare treatment for landfills to reduce climate relevant methane emissions. It is of social and economic interest to estimate the behavior of bacterial methane oxidation in aged landfill covers due to an adequate long-term treatment of the gas emissions. Different approaches assessing methane oxidation in laboratory column studies have been investigated by other authors recently. However, this work represents the first study in which three independent approaches, ((i) mass balance, (ii) stable isotope analysis, and (iii) stoichiometric balance of product (CO2) and reactant (CH4) by CO2/CH4-ratio) have been compared for the estimation of the biodegradation by a robust statistical validation on a rectangular, wide soil column. Additionally, an evaluation by thermal imaging as a potential technique for the localization of the active zone of bacterial methane oxidation has been addressed in connection with stable isotope analysis and CO2/CH4-ratios. Although landfills can be considered as open systems the results for stable isotope analysis based on a closed system correlated better with the mass balance than calculations based on an open system. CO2/CH4-ratios were also in good agreement with mass balance. In general, highest values for biodegradation were determined from mass balance, followed by CO2/CH4-ratio, and stable isotope analysis. The investigated topsoil proved to be very suitable as a potential cover layer by removing up to 99{\%} of methane for CH4 loads of 35--65gm--2d--1 that are typical in the aftercare phase of landfills. Finally, data from stable isotope analysis and the CO2/CH4-ratios were used to trace microbial activity within the reactor system. It was shown that methane consumption and temperature increase, as a cause of high microbial activity, correlated very well.}, author = {Schulte, Marcel and Jochmann, Maik A. and Gehrke, Tobias and Thom, Andrea and Ricken, Tim and Denecke, Martin and Schmidt, Torsten C.}, doi = {\url{10.1016/j.wasman.2017.07.032}}, file = {http://www.sciencedirect.com/science/article/pii/S0956053X1730524X}, issn = {0956-053X}, journal = {{Waste Management}}, pages = {281--288}, title = {{Characterization of methane oxidation in a simulated landfill cover system by comparing molecular and stable isotope mass balances}}, volume = 69, year = 2017 }
2. Moj, Lukas ; Foppe, Manuel ; Deike, Rüdiger ; Ricken, Tim: Micro-macro modelling of steel solidification: A continuum mechanical, bi-phasic, two-scale model including thermal driven phase transition. In: GAMM--Mitteilungen, GAMM--Mitteilungen. Bd. 40 (2017), Nr. 2, S. 125--137
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  @article{Moj.2017, abstract = {This paper addresses a continuum-mechanical, bi-phasic, two-scale numerical model for casting and processing of metallic alloys. The solid and liquid physical states, which represents the solid and molten alloy, are formulated in the framework of the theory of porous media (TPM) including thermal coupling, finite plasticity superimposed by a secondary power creep law and visco-elasticity associated by Darcy's permeability for the solid and the liquid phase, respectively. In view of phase transition during solidification, a two-scale approach considering the phase-field on the micro-scale is proposed, where a double-well potential with two local minima for completely solid and liquid physical states is utilized. The finite element method based on the standard Gallerkin element formulation and the finite difference method was employed for the macro-scale and the micro-scale, respectively. Finally, the performance of the discussed model is demonstrated by the recalculation and validation of a solidification experiment.}, author = {Moj, Lukas and Foppe, Manuel and Deike, R{\"u}diger and Ricken, Tim}, doi = {\url{10.1002/gamm.201720004}}, file = {7a4151c7-99f4-41de-ab7b-4878e66d9e91:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\7a4151c7-99f4-41de-ab7b-4878e66d9e91.pdf:pdf}, issn = {1522-2608}, journal = {{GAMM--Mitteilungen}}, number = 2, pages = {125--137}, title = {{Micro-macro modelling of steel solidification: A continuum mechanical, bi-phasic, two-scale model including thermal driven phase transition}}, volume = 40, year = 2017 }
3. Christ, Bruno ; Dahmen, Uta ; Herrmann, Karl-Heinz ; König, Matthias ; Reichenbach, Jürgen R. ; Ricken, Tim ; Schleicher, Jana ; Ole Schwen, Lars ; u. a.: Computational Modeling in Liver Surgery. In: Frontiers in Physiology, Frontiers in Physiology. Bd. 8 (2017), S. 906
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  @article{Christ.2017, abstract = {The need for extended liver resection is increasing due to the growing incidence of liver tumors in ageing societies. Individualized surgical planning is the key for identifying the optimal resection strategy and to minimize the risk of postoperative liver failure and tumor recurrence. Current computational tools provide virtual planning of liver resection by taking into account the spatial relationship between the tumor and the hepatic vascular trees, as well as the size of the future liver remnant. However, size and function of the liver are not necessarily equivalent. Hence, determining the future liver volume might misestimate the future liver function, especially in cases of hepatic comorbidities such as hepatic steatosis. A systems medicine approach could be applied, including biological, medical, and surgical aspects, by integrating all available anatomical and functional information of the individual patient. Such an approach holds promise for better prediction of postoperative liver function and hence improved risk assessment. This review provides an overview of mathematical models related to the liver and its function and explores their potential relevance for computational liver surgery. We first summarize key facts of hepatic anatomy, physiology, and pathology relevant for hepatic surgery, followed by a description of the computational tools currently used in liver surgical planning. Then we present selected state-of-the-art computational liver models potentially useful to support liver surgery. Finally, we discuss the main challenges that will need to be addressed when developing advanced computational planning tools in the context of liver surgery.}, author = {Christ, Bruno and Dahmen, Uta and Herrmann, Karl-Heinz and K{\"o}nig, Matthias and Reichenbach, J{\"u}rgen R. and Ricken, Tim and Schleicher, Jana and {Ole Schwen}, Lars and Vlaic, Sebastian and Waschinsky, Navina}, doi = {\url{10.3389/fphys.2017.00906}}, file = {http://dx.doi.org/10.3389/fphys.2017.00906}, journal = {{Frontiers in Physiology}}, pages = 906, title = {{Computational Modeling in Liver Surgery}}, volume = 8, year = 2017 }
2016
1. Henning, Carla ; Moj, Lukas ; Ricken, Tim: A ternary phase bi-scale FE-model for diffusion-driven dendritic alloy solidification processes. In: PAMM, PAMM. Bd. 16 (2016), Nr. 1, S. 449--450
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  @article{Henning.2016, abstract = {It is of high interest to describe alloy solidification processes with numerical simulations. In order to predict the material behavior as precisely as possible, a ternary phase, bi-scale numerical model will be presented. This paper is based on a coupled thermo-mechanical, two-phase, two-scale finite element model developed by Moj et~al. [2], where the theory of porous media (TPM) [1] has been used. Finite plasticity extended by secondary power-law creep is utilized to describe the solid phase and linear visco-elasticity with Darcy's law of permeability for the liquid phase, respectively. Here, the microscopic, temperature-driven phase transition approach is replaced by the diffusion-driven 0D model according to Wang and Beckermann [3]. The decisive material properties during solidification are captured by phenomenological formulations for dendritic growth and solute diffusion processes. A columnar as well as an equiaxial solidification example will be shown to demonstrate the principal performance of the presented model. ({\copyright} 2016 Wiley-VCH Verlag GmbH {\&} Co. KGaA, Weinheim)}, author = {Henning, Carla and Moj, Lukas and Ricken, Tim}, doi = {\url{10.1002/pamm.201610213}}, file = {9c3e1ee3-cce0-4f71-9edd-1c74a9361e34:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\9c3e1ee3-cce0-4f71-9edd-1c74a9361e34.pdf:pdf}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {449--450}, title = {{A ternary phase bi-scale FE-model for diffusion-driven dendritic alloy solidification processes}}, volume = 16, year = 2016 }
2. Waschinsky, Navina ; Werner, Daniel ; Ricken, Tim ; Dahmen, Uta ; Dirsch, Olaf: On a bi-scale and tri-phasic model for the description of growth in biological tissue using the example of the human liver. In: PAMM, PAMM. Bd. 16 (2016), Nr. 1, S. 109--110
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  @article{Waschinsky.2016, abstract = {The human liver is important for hepatic metabolism regulations which depend on complex and time depending biochemical reactions coupled to the hemodynamic blood perfusion. Growth effects can impair the perfusion and therefore affect the metabolism. Such influences can be observed during the accumulation of fat in the liver tissue. The fat accumulation results from the lipid metabolism which comprises synthesis and degradation of lipids in liver cells. Individual addictions to alcohol and high fat diets are possible causes which result in an excessive synthesis of lipids. The liver sensitively reacts to such changes which could affect the viability of the organ. To observe these coupled influences of perfusion-metabolism-growth effects we use a computational model with a multi-component/tri-phasic/bi-scale approach to simulate the functionality of the human liver with respect to fat deposition. ({\copyright} 2016 Wiley-VCH Verlag GmbH {\&} Co. KGaA, Weinheim)}, author = {Waschinsky, Navina and Werner, Daniel and Ricken, Tim and Dahmen, Uta and Dirsch, Olaf}, doi = {\url{10.1002/pamm.201610043}}, file = {4fa34f90-e10f-4cb9-98c1-08007842615d:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\4fa34f90-e10f-4cb9-98c1-08007842615d.pdf:pdf}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {109--110}, title = {{On a bi-scale and tri-phasic model for the description of growth in biological tissue using the example of the human liver}}, volume = 16, year = 2016 }
3. Pierce, David M. ; Unterberger, Michael J. ; Trobin, Werner ; Ricken, Tim ; Holzapfel, Gerhard A.: A microstructurally based continuum model of cartilage viscoelasticity and permeability incorporating measured statistical fiber orientations. In: Biomechanics and Modeling in Mechanobiology, Biomechanics and Modeling in Mechanobiology. Bd. 15 (2016), Nr. 1, S. 229--244
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  @article{Pierce.2016, abstract = {The remarkable mechanical properties of cartilage derive from an interplay of isotropically distributed, densely packed and negatively charged proteoglycans; a highly anisotropic and inhomogeneously oriented fiber network of collagens; and an interstitial electrolytic fluid. We propose a new 3D finite strain constitutive model capable of simultaneously addressing both solid (reinforcement) and fluid (permeability) dependence of the tissue's mechanical response on the patient-specific collagen fiber network. To represent fiber reinforcement, we integrate the strain energies of single collagen fibers-weighted by an orientation distribution function (ODF) defined over a unit sphere-over the distributed fiber orientations in 3D. We define the anisotropic intrinsic permeability of the tissue with a structure tensor based again on the integration of the local ODF over all spatial fiber orientations. By design, our modeling formulation accepts structural data on patient-specific collagen fiber networks as determined via diffusion tensor MRI. We implement our new model in 3D large strain finite elements and study the distributions of interstitial fluid pressure, fluid pressure load support and shear stress within a cartilage sample under indentation. Results show that the fiber network dramatically increases interstitial fluid pressure and focuses it near the surface. Inhomogeneity in the tissue's composition also increases fluid pressure and reduces shear stress in the solid. Finally, a biphasic neo-Hookean material model, as is available in commercial finite element codes, does not capture important features of the intra-tissue response, e.g., distributions of interstitial fluid pressure and principal shear stress.}, author = {Pierce, David M. and Unterberger, Michael J. and Trobin, Werner and Ricken, Tim and Holzapfel, Gerhard A.}, doi = {\url{10.1007/s10237-015-0685-x}}, file = {http://dx.doi.org/10.1007/s10237-015-0685-x}, issn = {1617-7940}, journal = {{Biomechanics and Modeling in Mechanobiology}}, number = 1, pages = {229--244}, title = {{A microstructurally based continuum model of cartilage viscoelasticity and permeability incorporating measured statistical fiber orientations}}, volume = 15, year = 2016 }
4. Bartel, Florian ; Ricken, Tim ; Schröder, Jörg ; Bluhm, Joachim: Remarks on coupled multi-scale simulations and high performance computation. In: PAMM, PAMM. Bd. 16 (2016), Nr. 1, S. 511--512
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  @article{Bartel.2016, abstract = {To describe material behaviour more precisely than nowadays, tomorrows simulation software will include multi-scale homogenisation techniques. State of the art are various scale bridging strategies, like FE-ODE, FE-Phasefield or FE2-Method. We are dealing with the FE2-Method, see [3], [4], which gives us the possibility to take the geometric, discrete micro-structure of a material into account. Furthermore, it allows to integrate enhanced continuum mechanical models. Here, we are researching on two-scale approach with poro-mechanical coupling based on the Theory of Porous Media (TPM), for more details see [1] or [2]. The framework is demanding and need a lot of computational effort. In order to receive industrial recognition, it is necessary to decrease the computation runtime. One way to go is definitely using high performance cluster. ({\copyright} 2016 Wiley-VCH Verlag GmbH {\&} Co. KGaA, Weinheim)}, author = {Bartel, Florian and Ricken, Tim and Schr{\"o}der, J{\"o}rg and Bluhm, Joachim}, doi = {\url{10.1002/pamm.201610244}}, file = {9ef13515-6407-4e32-ad55-d862aacfc483:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\9ef13515-6407-4e32-ad55-d862aacfc483.pdf:pdf}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {511--512}, title = {{Remarks on coupled multi-scale simulations and high performance computation}}, volume = 16, year = 2016 }
5. Seyedpour, S.Morteza ; Ricken, Tim: Modeling of contaminant migration in groundwater: A continuum mechanical approach using in the theory of porous media. In: PAMM, PAMM. Bd. 16 (2016), Nr. 1, S. 487--488
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  @article{Seyedpour.2016, abstract = {Over the past few decades, soil and subsequently groundwater contamination have raised growing concern as factors threatening the life of humans and other organisms as well as agricultural production sustainability. This study focuses on continuum mechanical multi-phase, multi-component formulation within the theory of porous media (TPM) to simulate the convective as well as diffusive driven contaminant tranport in groundwater including conversion processes. ({\copyright} 2016 Wiley-VCH Verlag GmbH {\&} Co. KGaA, Weinheim)}, author = {Seyedpour, S.Morteza and Ricken, Tim}, doi = {\url{10.1002/pamm.201610232}}, file = {6d5e1334-0782-48a9-8db0-07ba018f35f6:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\6d5e1334-0782-48a9-8db0-07ba018f35f6.pdf:pdf}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {487--488}, title = {{Modeling of contaminant migration in groundwater: A continuum mechanical approach using in the theory of porous media}}, volume = 16, year = 2016 }
2015
1. Werner, Daniel ; Ricken, Tim ; Dahmen, Uta ; Dirsch, Olaf ; Holzhütter, Hermann-Georg ; König, Matthias: On the Influence of Growth in Perfusion Dependent Biological Systems - at the Example of the Human Liver. In: PAMM, PAMM. Bd. 15 (2015), Nr. 1, S. 119--120
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  @article{Werner.2015, author = {Werner, Daniel and Ricken, Tim and Dahmen, Uta and Dirsch, Olaf and Holzh{\"u}tter, Hermann-Georg and K{\"o}nig, Matthias}, doi = {\url{10.1002/pamm.201510050}}, file = {https://doi.org/10.1002/pamm.201510050}, issn = {16177061}, journal = {{PAMM}}, number = 1, pages = {119--120}, title = {{On the Influence of Growth in Perfusion Dependent Biological Systems - at the Example of the Human Liver}}, volume = 15, year = 2015 }
2. Ricken, T. ; Werner, D. ; Holzhütter, H. G. ; König, M. ; Dahmen, U. ; Dirsch, O.: Modeling function-perfusion behavior in liver lobules including tissue, blood, glucose, lactate and glycogen by use of a coupled two-scale PDE-ODE approach. In: Biomech Model Mechanobiol, Biomech Model Mechanobiol. Bd. 14 (2015), Nr. 3, S. 515--536
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  @article{Ricken.2015, abstract = {This study focuses on a two-scale, continuum multicomponent model for the description of blood perfusion and cell metabolism in the liver. The model accounts for a spatial and time depending hydro-diffusion-advection-reaction description. We consider a solid-phase (tissue) containing glycogen and a fluid-phase (blood) containing glucose as well as lactate. The five-component model is enhanced by a two-scale approach including a macroscale (sinusoidal level) and a microscale (cell level). The perfusion on the macroscale within the lobules is described by a homogenized multiphasic approach based on the theory of porous media (mixture theory combined with the concept of volume fraction). On macro level, we recall the basic mixture model, the governing equations as well as the constitutive framework including the solid (tissue) stress, blood pressure and solutes chemical potential. In view of the transport phenomena, we discuss the blood flow including transverse isotropic permeability, as well as the transport of solute concentrations including diffusion and advection. The continuum multicomponent model on the macroscale finally leads to a coupled system of partial differential equations (PDE). In contrast, the hepatic metabolism on the microscale (cell level) was modeled via a coupled system of ordinary differential equations (ODE). Again, we recall the constitutive relations for cell metabolism level. A finite element implementation of this framework is used to provide an illustrative example, describing the spatial and time-depending perfusion-metabolism processes in liver lobules that integrates perfusion and metabolism of the liver.}, author = {Ricken, T. and Werner, D. and Holzh{\"u}tter, H. G. and K{\"o}nig, M. and Dahmen, U. and Dirsch, O.}, doi = {\url{10.1007/s10237-014-0619-z}}, file = {http://www.ncbi.nlm.nih.gov/pubmed/25236798}, issn = {1617-7940 (Electronic) 1617-7940 (Linking)}, journal = {{Biomech Model Mechanobiol}}, number = 3, pages = {515--536}, title = {{Modeling function-perfusion behavior in liver lobules including tissue, blood, glucose, lactate and glycogen by use of a coupled two-scale PDE-ODE approach}}, volume = 14, year = 2015 }
3. Thom, Andrea ; Ricken, Tim ; Bluhm, Joachim ; Widmann, Renatus ; Denecke, Martin ; Gehrke, Tobias: Validation of a coupled FE-model for the simulation of methane oxidation via thermal imaging. In: PAMM, PAMM. Bd. 15 (2015), Nr. 1, S. 433--434
  - BibTeX
  BibTeX
  @article{Thom.2015, author = {Thom, Andrea and Ricken, Tim and Bluhm, Joachim and Widmann, Renatus and Denecke, Martin and Gehrke, Tobias}, doi = {\url{10.1002/pamm.201510207}}, file = {https://doi.org/10.1002/pamm.201510207}, issn = {16177061}, journal = {{PAMM}}, number = 1, pages = {433--434}, title = {{Validation of a coupled FE-model for the simulation of methane oxidation via thermal imaging}}, volume = 15, year = 2015 }
4. Bartel, Florian ; Ricken, Tim ; Schröder, Jörg ; Bluhm, Joachim: A two-scale homogenisation approach for fluid saturated porous media based on TPM and FE 2 -Method. In: PAMM, PAMM. Bd. 15 (2015), Nr. 1, S. 447--448
  - BibTeX
  BibTeX
  @article{Bartel.2015, author = {Bartel, Florian and Ricken, Tim and Schr{\"o}der, J{\"o}rg and Bluhm, Joachim}, doi = {\url{10.1002/pamm.201510214}}, file = {https://doi.org/10.1002/pamm.201510214}, issn = {16177061}, journal = {{PAMM}}, number = 1, pages = {447--448}, title = {{A two-scale homogenisation approach for fluid saturated porous media based on TPM and FE 2 -Method}}, volume = 15, year = 2015 }
5. Moj, Lukas ; Ricken, Tim ; Steinbach, Ingo: A continuum mechanical, bi-phasic, two-scale model for thermal driven phase transition during solidification. In: PAMM, PAMM. Bd. 15 (2015), Nr. 1, S. 409--410
  - BibTeX
  BibTeX
  @article{Moj.2015, author = {Moj, Lukas and Ricken, Tim and Steinbach, Ingo}, doi = {\url{10.1002/pamm.201510195}}, file = {https://doi.org/10.1002/pamm.201510195}, issn = {16177061}, journal = {{PAMM}}, number = 1, pages = {409--410}, title = {{A continuum mechanical, bi-phasic, two-scale model for thermal driven phase transition during solidification}}, volume = 15, year = 2015 }
2014
1. Bluhm, J. ; Bloßfeld, W. M. ; Ricken, T.: Energetic effects during phase transition under freezing-thawing load in porous media -- a continuum multiphase description and FE-simulation. In: ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik, ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift für Angewandte Mathematik und Mechanik. Bd. 94 (2014), Nr. 7–8, S. 586--608
  - BibTeX
  BibTeX
  @article{Bluhm.2014, abstract = {In civil engineering, the frost durability of partly liquid saturated porous media under freezing and thawing conditions is a point of great discussion. Ice formation in porous media results from coupled heat and mass transport and is accompanied by ice expansion. The volume increase in space and time corresponds to the moving freezing front inside the porous solid. In this paper, a macroscopic model based on the Theory of Porous Media (TPM) is presented which describes energetic effects of freezing and thawing processes. For simplification a ternary model consisting of the phases solid, ice and liquid is used. Attention is paid to the description of the temperature development, the determination of energy, enthalpy and mass supply as well as volume deformations due to ice formation during a freezing and thawing cycle. For the detection of energetic effects regarding the characterization and control of phase transition of water and ice, a physically motivated evolution equation for the mass exchange between ice and liquid is presented. Comparing experimental data with numerical examples shows that the simplified model is indeed capable of simulating the temperature development and energetic effects during phase change.}, author = {Bluhm, J. and Blo{\ss}feld, W. M. and Ricken, T.}, doi = {\url{10.1002/zamm.201200154}}, file = {http://dx.doi.org/10.1002/zamm.201200154}, issn = {1521-4001}, journal = {{ZAMM - Journal of Applied Mathematics and Mechanics / Zeitschrift f{\"u}r Angewandte Mathematik und Mechanik}}, number = {7-8}, pages = {586--608}, title = {{Energetic effects during phase transition under freezing-thawing load in porous media -- a continuum multiphase description and FE-simulation}}, volume = 94, year = 2014 }
2. Albrecht, Daniel ; Ricken, Tim ; Pierce, David M.: A Multi-Component Description of Osmotic Driven Deformations in Articular Cartilage. In: PAMM, PAMM. Bd. 14 (2014), Nr. 1, S. 109--110
  - BibTeX
  BibTeX
  @article{Albrecht.2014, abstract = {This study focuses on a formulation within the theory of porous media (TPM) for continuum multicomponent modeling of osmotic driven deformation in articular cartilage. The cartilage consists of porous solid matrix (extracellular matrix(ECM)),which is reinforced by collagen fibers and saturated by a fluid phase. The solid and fluid phases are considered as immiscible constituents occupying spatially their individual volume fraction. However, both phases include electrolytes, which are responsible for the osmotic pressure. The collagen fiber induce both, a transverse-isotropic stress and permeability behavior which is represented in the modal approach by an invariant-based description for the stress and anisotropic permeability tensor for the fluid flow, respectively. The osmotic pressure is captured by considering the electro-chemical potential of the electrolytes. After discussing the main details of the large-strain coupled poro-osmotic-hyper-elastic model approach, a brief numerical example is given. ({\copyright} 2014 Wiley-VCH Verlag GmbH {\&} Co. KGaA, Weinheim)}, author = {Albrecht, Daniel and Ricken, Tim and Pierce, David M.}, doi = {\url{10.1002/pamm.201410042}}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.201410042/asset/109_ftp.pdf?v=1&t=i7xkt1gr&s=4917eaf30057b8c2b81b45e04d25957a1ad86501}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {109--110}, title = {{A Multi-Component Description of Osmotic Driven Deformations in Articular Cartilage}}, volume = 14, year = 2014 }
3. Ricken, Tim ; Sindern, Andrea ; Bluhm, Joachim ; Widmann, Renatus ; Denecke, Martin ; Gehrke, Tobias ; Schmidt, Torsten C.: Concentration driven phase transitions in multiphase porous media with application to methane oxidation in landfill cover layers. In: ZAMM--Journal of Applied Mathematics and Mechanics/Zeitschrift für Angewandte Mathematik und Mechanik, ZAMM--Journal of Applied Mathematics and Mechanics/Zeitschrift für Angewandte Mathematik und Mechanik. Bd. 94 (2014), Nr. 7, S. 609--622
  - BibTeX
  BibTeX
  @article{Ricken.2014, author = {Ricken, Tim and Sindern, Andrea and Bluhm, Joachim and Widmann, Renatus and Denecke, Martin and Gehrke, Tobias and Schmidt, Torsten C.}, file = {438dcfe6-539f-4f8c-a688-aa766cba44ef:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\438dcfe6-539f-4f8c-a688-aa766cba44ef.pdf:pdf}, journal = {{ZAMM--Journal of Applied Mathematics and Mechanics/Zeitschrift f{\"u}r Angewandte Mathematik und Mechanik}}, number = 7, pages = {609--622}, title = {{Concentration driven phase transitions in multiphase porous media with application to methane oxidation in landfill cover layers}}, volume = 94, year = 2014 }
4. Werner, Daniel ; Ricken, Tim ; Holzhütter, Hermann-Georg ; König, Matthias ; Dahmen, Uta ; Dirsch, Olaf: On growth effects in the human liver. In: PAMM, PAMM. Bd. 14 (2014), Nr. 1, S. 105--106
  - BibTeX
  BibTeX
  @article{Werner.2014, abstract = {Fatty liver is a common disease in the western society. Different stimuli, such as obesity or abuse of alcohol, cause the liver to store fat within liver cells, the so called hepatocytes. This growth induced by storage of fat influences the perfusion of the overlying structures, i. e. sinusoids, liver lobules, liver lobes, and consequently the liver itself. The scales of these structures reach from few µm (size of a hepatocyte) to several cm (size of liver). In view of finite element (FE) simulations, the necessity of introducing different scales becomes obvious. For the description of growth effects in the liver the relevant quantities are: perfusion of the liver and amount of substances that are needed for production of fat (glycogen and fatty acids). In this work we present a multiphasic continuum mechanical model for the description of micro-perfusion in the liver lobule using a homogenized multiphasic approach based on the theory of porous media (TPM). Into this model we inserted a zero-dimensional (0D) kinetic model calculating rates of all relevant substances. So far, the model focuses on the time dependent and spatial zonation of glycogen, since production of fat heavily depends on the stored glycogen. Additionally, a possible method for incorporating fatty acids and therefor also growth will be presented. ({\copyright} 2014 Wiley-VCH Verlag GmbH {\&} Co. KGaA, Weinheim)}, author = {Werner, Daniel and Ricken, Tim and Holzh{\"u}tter, Hermann-Georg and K{\"o}nig, Matthias and Dahmen, Uta and Dirsch, Olaf}, doi = {\url{10.1002/pamm.201410040}}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.201410040/asset/105_ftp.pdf?v=1&t=i7xkt0p7&s=c7dd93293f48ab27943096536ceabebdbf71730e}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {105--106}, title = {{On growth effects in the human liver}}, volume = 14, year = 2014 }
5. Moj, Lukas ; Ricken, Tim ; Steinbach, Ingo: Multi-Scale and Multi-Component Approach for Solidification Processes. In: PAMM, PAMM. Bd. 14 (2014), Nr. 1, S. 465--466
  - BibTeX
  BibTeX
  @article{Moj.2014, abstract = {This articel focuses on a thermo-mechanical model for numerical simulation of solidification processes considering two different scales, both in time and space. The macro-scale implies two phases (solid and liquid steel), and is described by use of the theory of porous media (TPM). Moreover, a strong thermal coupling is addressed as well as finite J2 elastic-plastic solid behavior. The physics of solidification during heat dissipation is covered on the micro-scale in the framework of phase-field modeling. Therefore, a Ginzburg-Landau type free energy function is used. After discussing the main model details, a numerical example will demonstrate the principal performance of the presented model. ({\copyright} 2014 Wiley-VCH Verlag GmbH {\&} Co. KGaA, Weinheim)}, author = {Moj, Lukas and Ricken, Tim and Steinbach, Ingo}, doi = {\url{10.1002/pamm.201410220}}, file = {http://dx.doi.org/10.1002/pamm.201410220}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {465--466}, title = {{Multi-Scale and Multi-Component Approach for Solidification Processes}}, volume = 14, year = 2014 }
6. Sindern, Andrea ; Ricken, Tim ; Bluhm, Joachim ; Widmann, Renatus ; Denecke, Martin ; Gehrke, Tobias: A coupled multi-component approach for bacterial methane oxidation in landfill cover layers. In: PAMM, PAMM. Bd. 14 (2014), Nr. 1, S. 469--470
  - BibTeX
  BibTeX
  @article{Sindern.2014, abstract = {Methane (CH4), which has a 25 times higher global warming potential than carbon dioxide (CO2), can be oxidated by methanotrophic bacteria into carbon dioxide and water. The biological oxidation of methane can be considered in the passive aftercare phase of landfills in order to reduce climate-damaging methane emissions. Methanotrophic bacteria are situated within the landfill cover layer and convert the harmful methane emissions arising from the degradation of organic waste to the less harmful carbon dioxide. Hence, the passive aftercare of landfills in terms of methane oxidation layers is an efficient method to reduce contributions to the greenhouse effect. To model the coupled processes during phase transition from methane to carbon dioxide, the well-known Theory of Porous Media (TPM) combined with the Mixture Theory has been used in order to develop a multi-component Finite Element calculation concept, see [1, 3]. The thermodynamic consistent model analyzes the relevant gas productions of methane, carbon dioxide and oxygen. The model also accounts for the driving phenomena of production, diffusion and advection. ({\copyright} 2014 Wiley-VCH Verlag GmbH {\&} Co. KGaA, Weinheim)}, author = {Sindern, Andrea and Ricken, Tim and Bluhm, Joachim and Widmann, Renatus and Denecke, Martin and Gehrke, Tobias}, doi = {\url{10.1002/pamm.201410222}}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.201410222/asset/469_ftp.pdf?v=1&t=i7xkt8oh&s=6b23f07bf38736eb7535e3268ffeacaae13f1c97}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {469--470}, title = {{A coupled multi-component approach for bacterial methane oxidation in landfill cover layers}}, volume = 14, year = 2014 }
7. Ricken, Tim ; Bluhm, Joachim: Modeling of liquid and gas saturated porous solids under freezing and thawing cycles. In: Schanz, T. ; Hettler, A. (Hrsg.) ; Schanz, T. ; Hettler, A. (Hrsg.): Aktuelle Forschung in der Bodenmechanik 2013, Aktuelle Forschung in der Bodenmechanik 2013 : Springer Berlin Heidelberg, 2014 — ISBN 978-3-642-37541-5, S. 23--42
  - BibTeX
  BibTeX
  @incollection{Ricken.2014b, author = {Ricken, Tim and Bluhm, Joachim}, booktitle = {{Aktuelle Forschung in der Bodenmechanik 2013}}, doi = {\url{10.1007/978-3-642-37542-2{\textunderscore }2}}, editor = {Schanz, Tom and Hettler, Achim}, file = {http://dx.doi.org/10.1007/978-3-642-37542-2_2}, isbn = {978-3-642-37541-5}, pages = {23--42}, publisher = {{Springer Berlin Heidelberg}}, title = {{Modeling of liquid and gas saturated porous solids under freezing and thawing cycles}}, year = 2014 }
2013
1. Ricken, Tim ; Dahmen, Uta ; Dirsch, Olaf ; Werner, Daniel Q.: A Biphasic 3D-FEM Model for the Remodeling of Microcirculation in Liver Lobes. In: Computer Models in Biomechanics, Computer Models in Biomechanics : Springer, 2013 — ISBN 9400754639, S. 277--292
  - BibTeX
  BibTeX
  @incollection{Ricken.2013, author = {Ricken, Tim and Dahmen, Uta and Dirsch, Olaf and Werner, Daniel Q.}, booktitle = {{Computer Models in Biomechanics}}, file = {http://link.springer.com/10.1007/978-94-007-5464-5_20}, isbn = {9400754639}, pages = {277--292}, publisher = {Springer}, title = {{A Biphasic 3D-FEM Model for the Remodeling of Microcirculation in Liver Lobes}}, year = 2013 }
2. Sindern, Andrea ; Ricken, Tim ; Bluhm, Joachim ; Widmann, Renatus ; Denecke, Martin: Bacterial methane oxidation in landfill cover layers--a coupled FE multiphase description. In: PAMM, PAMM. Bd. 13 (2013), Nr. 1, S. 193--194
  - BibTeX
  BibTeX
  @article{Sindern.2013, author = {Sindern, Andrea and Ricken, Tim and Bluhm, Joachim and Widmann, Renatus and Denecke, Martin}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.201310092/asset/193_ftp.pdf?v=1&t=hu0ymz6n&s=b211751890e6c674a7ba633bb34c5a020cea174a}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {193--194}, title = {{Bacterial methane oxidation in landfill cover layers--a coupled FE multiphase description}}, volume = 13, year = 2013 }
3. Pierce, David M. ; Ricken, Tim ; Holzapfel, Gerhard A.: A hyperelastic biphasic fibre-reinforced model of articular cartilage considering distributed collagen fibre orientations: continuum basis, computational aspects and applications. In: Computer Methods in Biomechanics and Biomedical Engineering, Computer Methods in Biomechanics and Biomedical Engineering. Bd. 16 (2013), Nr. 12, S. 1344--1361
  - BibTeX
  BibTeX
  @article{Pierce.2013, author = {Pierce, David M. and Ricken, Tim and Holzapfel, Gerhard A.}, file = {http://www.tandfonline.com/doi/abs/10.1080/10255842.2012.670854}, issn = {1025-5842}, journal = {{Computer Methods in Biomechanics and Biomedical Engineering}}, number = 12, pages = {1344--1361}, title = {{A hyperelastic biphasic fibre-reinforced model of articular cartilage considering distributed collagen fibre orientations: continuum basis, computational aspects and applications}}, volume = 16, year = 2013 }
4. Werner, Daniel ; Ricken, Tim ; Ferreira Pfeiffer, Anne: On a FEM model for isotropic and transversely isotropic growth in biphasic materials. In: PAMM, PAMM. Bd. 13 (2013), Nr. 1, S. 63--64
  - BibTeX
  BibTeX
  @article{Werner.2013, author = {Werner, Daniel and Ricken, Tim and {Ferreira Pfeiffer}, Anne}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.201310027/asset/63_ftp.pdf?v=1&t=hu0yywo7&s=6bcb07ef663d8c62eb7a2b82a000cabcd5c0da86}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {63--64}, title = {{On a FEM model for isotropic and transversely isotropic growth in biphasic materials}}, volume = 13, year = 2013 }
5. Pierce, D. M. ; Ricken, T. ; Holzapfel, Gerhard A.: Modeling sample/patient--specific structural and diffusional responses of cartilage using DT--MRI. In: International Journal for Numerical Methods in Biomedical Engineering, International Journal for Numerical Methods in Biomedical Engineering. Bd. 29 (2013), Nr. 8, S. 807--821
  - BibTeX
  BibTeX
  @article{Pierce.2013b, author = {Pierce, D. M. and Ricken, T. and Holzapfel, Gerhard A.}, file = {d6ae0da8-f19a-471a-9076-59b109215cd6:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\d6ae0da8-f19a-471a-9076-59b109215cd6.pdf:pdf}, issn = {2040-7947}, journal = {{International Journal for Numerical Methods in Biomedical Engineering}}, number = 8, pages = {807--821}, title = {{Modeling sample/patient--specific structural and diffusional responses of cartilage using DT--MRI}}, volume = 29, year = 2013 }
6. Albrecht, Daniel ; Ricken, Tim ; Pierce, David M. ; Holzapfel, Gerhard A.: A hyperelastic biphasic fiber reinforced model for articular cartilage considering the distribution and orientation of collagen fibers. In: PAMM, PAMM. Bd. 13 (2013), Nr. 1, S. 55--56
  - BibTeX
  BibTeX
  @article{Albrecht.2013, author = {Albrecht, Daniel and Ricken, Tim and Pierce, David M. and Holzapfel, Gerhard A.}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.201310023/asset/55_ftp.pdf?v=1&t=htu9ldio&s=b453c221b3251f75c0fe06b96130fe51d2c3dee0}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {55--56}, title = {{A hyperelastic biphasic fiber reinforced model for articular cartilage considering the distribution and orientation of collagen fibers}}, volume = 13, year = 2013 }
2012
1. Sindern, Andrea ; Ricken, Tim ; Bluhm, Joachim ; Denecke, Martin ; Schmidt, Torsten C.: Phase transition in methane oxidation layers--a coupled FE multiphase description. In: PAMM, PAMM. Bd. 12 (2012), Nr. 1, S. 371--372
  - BibTeX
  BibTeX
  @article{Sindern.2012, author = {Sindern, Andrea and Ricken, Tim and Bluhm, Joachim and Denecke, Martin and Schmidt, Torsten C.}, file = {a6213285-c896-4db8-92e0-3787eba937dd:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\a6213285-c896-4db8-92e0-3787eba937dd.pdf:pdf;a33a25b1-4431-4e04-a627-39d364c37c0a:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\a33a25b1-4431-4e04-a627-39d364c37c0a.pdf:pdf}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {371--372}, title = {{Phase transition in methane oxidation layers--a coupled FE multiphase description}}, volume = 12, year = 2012 }
2. Albrecht, Daniel ; Ricken, Tim ; Pierce, David M. ; Holzapfel, Gerhard A.: A biphasic transverse isotropic FEM model for cartilage. In: PAMM, PAMM. Bd. 12 (2012), Nr. 1, S. 105--106
  - BibTeX
  BibTeX
  @article{Albrecht.2012, author = {Albrecht, Daniel and Ricken, Tim and Pierce, David M. and Holzapfel, Gerhard A.}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.201210044/asset/105_ftp.pdf?v=1&t=htu9iacj&s=f1de993c20879f9632998ff9702ecbc7668fba7c}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {105--106}, title = {{A biphasic transverse isotropic FEM model for cartilage}}, volume = 12, year = 2012 }
3. Werner, Daniel ; Ricken, Tim ; Dahmen, Uta ; Dirsch, Olaf: A Biphasic FEM Model for the Microperfusion in Liver Lobules. In: PAMM, PAMM. Bd. 12 (2012), Nr. 1, S. 89--90
  - BibTeX
  BibTeX
  @article{Werner.2012, author = {Werner, Daniel and Ricken, Tim and Dahmen, Uta and Dirsch, Olaf}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.201210036/asset/89_ftp.pdf?v=1&t=hu0yyoq1&s=c96ce249d0d9da6c8cbd2d399fb8871ad9b06bf6}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {89--90}, title = {{A Biphasic FEM Model for the Microperfusion in Liver Lobules}}, volume = 12, year = 2012 }
4. Bloßfeld, Wolfgang Moritz ; Bluhm, Joachim ; Ricken, Tim: Simulation of Freezing and Thawing Processes with Capillary Effects in fluid filled porous media. In: PAMM, PAMM. Bd. 12 (2012), Nr. 1, S. 365--366
  - BibTeX
  BibTeX
  @article{Blofeld.2012, author = {Blo{\ss}feld, Wolfgang Moritz and Bluhm, Joachim and Ricken, Tim}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.201210171/asset/365_ftp.pdf?v=1&t=htu9lk4x&s=2827477584a53291045a53a5c75b53436fefb58d}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {365--366}, title = {{Simulation of Freezing and Thawing Processes with Capillary Effects in fluid filled porous media}}, volume = 12, year = 2012 }
2011
1. Bluhm, Joachim ; Bloßfeld, Wolfgang Moritz ; Ricken, Tim: Simulation of Capillary Effects and Phase Transition under Freezing and Thawing Load in Liquid and Gas Saturated Porous Media. In: PAMM, PAMM. Bd. 11 (2011), Nr. 1, S. 455--456
  - BibTeX
  BibTeX
  @article{Bluhm.2011b, author = {Bluhm, Joachim and Blo{\ss}feld, Wolfgang Moritz and Ricken, Tim}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.201110219/asset/455_ftp.pdf?v=1&t=htu9lpx8&s=76f9e413c984e2aae4af7ad68580228138ecb389}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {455--456}, title = {{Simulation of Capillary Effects and Phase Transition under Freezing and Thawing Load in Liquid and Gas Saturated Porous Media}}, volume = 11, year = 2011 }
2. Robeck, Markus ; Ricken, Tim ; Widmann, Renatus: A finite element simulation of biological conversion processes in landfills. In: Waste Management, Waste Management. Bd. 31 (2011), Nr. 4, S. 663--669
  - BibTeX
  BibTeX
  @article{Robeck.2011, author = {Robeck, Markus and Ricken, Tim and Widmann, Renatus}, doi = {\url{10.1016/j.wasman.2010.08.007}}, file = {http://ac.els-cdn.com/S0956053X10003880/1-s2.0-S0956053X10003880-main.pdf?_tid=5b8ba48c-c0ce-11e3-9178-00000aab0f6c&acdnat=1397148008_ba21d13174396c14c31576dd758816fd}, issn = {0956-053X}, journal = {{Waste Management}}, number = 4, pages = {663--669}, title = {{A finite element simulation of biological conversion processes in landfills}}, volume = 31, year = 2011 }
3. Lilledahl, Magnus B. ; Pierce, David M. ; Ricken, Tim ; Holzapfel, Gerhard A. ; de Lange Davies, Catarina: Extracting quantitative biomechanical parameters for cartilage from second harmonic generation images. In: Periasamy, A. ; König, K. ; So, P. T. C. (Hrsg.) ; Periasamy, A. ; König, K. ; So, P. T. C. (Hrsg.): SPIE BiOS, SPIE BiOS : SPIE, 2011, S. 79033A
  - BibTeX
  BibTeX
  @inproceedings{Lilledahl.2011b, author = {Lilledahl, Magnus B. and Pierce, David M. and Ricken, Tim and Holzapfel, Gerhard A. and de {Lange Davies}, Catarina}, booktitle = {{SPIE BiOS}}, doi = {\url{10.1117/12.888087}}, editor = {Periasamy, Ammasi and K{\"o}nig, Karsten and So, Peter T. C.}, file = {https://doi.org/10.1117/12.888087}, pages = {79033A}, publisher = {SPIE}, series = {{SPIE Proceedings}}, title = {{Extracting quantitative biomechanical parameters for cartilage from second harmonic generation images}}, year = 2011 }
4. Bluhm, Joachim ; Ricken, Tim ; Bloßfeld, Moritz: Ice Formation in Porous Media. In: Advances in Extended and Multifield Theories for Continua, Advances in Extended and Multifield Theories for Continua : Springer, 2011 — ISBN 3642227376, S. 153--174
  - BibTeX
  BibTeX
  @incollection{Bluhm.2011, author = {Bluhm, Joachim and Ricken, Tim and Blo{\ss}feld, Moritz}, booktitle = {{Advances in Extended and Multifield Theories for Continua}}, file = {http://link.springer.com/10.1007/978-3-642-22738-7_8}, isbn = {3642227376}, pages = {153--174}, publisher = {Springer}, title = {{Ice Formation in Porous Media}}, year = 2011 }
5. Lilledahl, Magnus B. ; Pierce, David M. ; Ricken, Tim ; Holzapfel, Gerhard A. ; de Lange Davies, Catharina: Structural analysis of articular cartilage using multiphoton microscopy: input for biomechanical modeling. In: Medical Imaging, IEEE Transactions on, Medical Imaging, IEEE Transactions on. Bd. 30 (2011), Nr. 9, S. 1635--1648
  - BibTeX
  BibTeX
  @article{Lilledahl.2011, author = {Lilledahl, Magnus B. and Pierce, David M. and Ricken, Tim and Holzapfel, Gerhard A. and de {Lange Davies}, Catharina}, file = {29072f3a-d023-4372-a891-4225e636466f:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\29072f3a-d023-4372-a891-4225e636466f.pdf:pdf}, issn = {0278-0062}, journal = {{Medical Imaging, IEEE Transactions on}}, number = 9, pages = {1635--1648}, title = {{Structural analysis of articular cartilage using multiphoton microscopy: input for biomechanical modeling}}, volume = 30, year = 2011 }
6. Ricken, Tim ; Widmann, Renatus ; Schmidt, Torsten C.: On the Modeling and Simulation of Biological Methane Oxidation in porous media-A Multiphase Continuum Approach (2011)
  - BibTeX
  BibTeX
  @article{Ricken.2011, author = {Ricken, Tim and Widmann, Renatus and Schmidt, Torsten C.}, title = {{On the Modeling and Simulation of Biological Methane Oxidation in porous media-A Multiphase Continuum Approach}}, year = 2011 }
2010
1. Bluhm, Joachim ; Ricken, Tim ; Bloßfeld, Wolfgang Moritz: Simulation of freeze--thaw--cycles in liquid--and gas saturated porous media. In: PAMM, PAMM. Bd. 10 (2010), Nr. 1, S. 359--360
  - BibTeX
  BibTeX
  @article{Bluhm.2010, author = {Bluhm, Joachim and Ricken, Tim and Blo{\ss}feld, Wolfgang Moritz}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.201010172/asset/359_ftp.pdf?v=1&t=htu9m28g&s=e3a8c752e53aa4fdf9e322003044a2873544fa72}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {359--360}, title = {{Simulation of freeze--thaw--cycles in liquid--and gas saturated porous media}}, volume = 10, year = 2010 }
2. Ricken, Tim ; Bluhm, Joachim: Remodeling and growth of living tissue: a multiphase theory. In: Archive of Applied Mechanics, Archive of Applied Mechanics. Bd. 80 (2010), Nr. 5, S. 453--465
  - BibTeX
  BibTeX
  @article{Ricken.2010b, author = {Ricken, Tim and Bluhm, Joachim}, file = {http://download.springer.com/static/pdf/357/art%253A10.1007%252Fs00419-009-0383-1.pdf?auth66=1397320542_dc2e24b039bd1a45fcf602be9141ee75&ext=.pdf}, issn = {0939-1533}, journal = {{Archive of Applied Mechanics}}, number = 5, pages = {453--465}, title = {{Remodeling and growth of living tissue: a multiphase theory}}, volume = 80, year = 2010 }
3. Ricken, Tim ; Dahmen, Uta ; Dirsch, Olaf: A biphasic model for sinusoidal liver perfusion remodeling after outflow obstruction. In: Biomechanics and Modeling in Mechanobiology, Biomechanics and Modeling in Mechanobiology. Bd. 9 (2010), Nr. 4, S. 435--450
  - BibTeX
  BibTeX
  @article{Ricken.2010, author = {Ricken, Tim and Dahmen, Uta and Dirsch, Olaf}, doi = {\url{10.1007/s10237-009-0186-x}}, file = {33b19e01-21d1-4a8f-ac8a-6e112a4dab7d:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\33b19e01-21d1-4a8f-ac8a-6e112a4dab7d.pdf:pdf}, issn = {1617-7959}, journal = {{Biomechanics and Modeling in Mechanobiology}}, number = 4, pages = {435--450}, title = {{A biphasic model for sinusoidal liver perfusion remodeling after outflow obstruction}}, volume = 9, year = 2010 }
4. Ricken, Tim ; Bluhm, Joachim: Modeling fluid saturated porous media under frost attack. In: GAMM--Mitteilungen, GAMM--Mitteilungen. Bd. 33 (2010), Nr. 1, S. 40--56
  - BibTeX
  BibTeX
  @article{Ricken.2010c, author = {Ricken, Tim and Bluhm, Joachim}, file = {http://onlinelibrary.wiley.com/store/10.1002/gamm.201010004/asset/40_ftp.pdf?v=1&t=htu9ogzh&s=776bbbde1716b3b77c3ce812dc2e9133a1f497ea}, issn = {1522-2608}, journal = {{GAMM--Mitteilungen}}, number = 1, pages = {40--56}, title = {{Modeling fluid saturated porous media under frost attack}}, volume = 33, year = 2010 }
5. Pierce, D. M. ; Lilledahl, M. B. ; Ricken, T. ; de Lange Davies, C. ; Holzapfel, G. A.: Morphological Analysis of Articular Cartilage Using Multiphoton Microscopy as Input for Constitutive Modeling: Experiment and Mathematical Implementation. In: 6th World Congress of Biomechanics (WCB 2010). August 1-6, 2010 Singapore, 6th World Congress of Biomechanics (WCB 2010). August 1-6, 2010 Singapore : Springer, 2010 — ISBN 3642145140, S. 895--898
  - BibTeX
  BibTeX
  @incollection{Pierce.2010, author = {Pierce, D. M. and Lilledahl, M. B. and Ricken, T. and de {Lange Davies}, C. and Holzapfel, G. A.}, booktitle = {{6th World Congress of Biomechanics (WCB 2010). August 1-6, 2010 Singapore}}, isbn = {3642145140}, pages = {895--898}, publisher = {Springer}, title = {{Morphological Analysis of Articular Cartilage Using Multiphoton Microscopy as Input for Constitutive Modeling: Experiment and Mathematical Implementation}}, year = 2010 }
6. Ateshian, Gerard A. ; Ricken, Tim: Multigenerational interstitial growth of biological tissues. In: Biomechanics and Modeling in Mechanobiology, Biomechanics and Modeling in Mechanobiology. Bd. 9 (2010), Nr. 6, S. 689--702
  - BibTeX
  BibTeX
  @article{Ateshian.2010, author = {Ateshian, Gerard A. and Ricken, Tim}, doi = {\url{10.1007/s10237-010-0205-y}}, file = {30365340-cc06-4a2f-87b7-b85c9412083c:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Remote Attachments\\30365340-cc06-4a2f-87b7-b85c9412083c.pdf:pdf;ae521e11-724d-4345-bebb-44c83cadf123:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\ae521e11-724d-4345-bebb-44c83cadf123.pdf:pdf;e02f6c04-aa82-4664-95fd-4a1a2027ccc2:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\e02f6c04-aa82-4664-95fd-4a1a2027ccc2.pdf:pdf}, issn = {1617-7959}, journal = {{Biomechanics and Modeling in Mechanobiology}}, number = 6, pages = {689--702}, title = {{Multigenerational interstitial growth of biological tissues}}, volume = 9, year = 2010 }
2009
1. Ricken, Tim ; Bluhm, Joachim: Evolutional growth and remodeling in multiphase living tissue. In: Computational Materials Science, Computational Materials Science. Bd. 45 (2009), Nr. 3, S. 806--811
  - BibTeX
  BibTeX
  @article{Ricken.2009b, author = {Ricken, Tim and Bluhm, Joachim}, doi = {\url{10.1016/j.commatsci.2008.10.016}}, file = {http://ac.els-cdn.com/S0927025608004771/1-s2.0-S0927025608004771-main.pdf?_tid=16f20dde-c0ce-11e3-9fb6-00000aab0f02&acdnat=1397147893_3e91ad4fbfce028afaf99e6dd320bf34}, issn = {0927-0256}, journal = {{Computational Materials Science}}, number = 3, pages = {806--811}, title = {{Evolutional growth and remodeling in multiphase living tissue}}, volume = 45, year = 2009 }
2. Ricken, T. ; Bluhm, J. ; Epple, M. ; Wehmöller, M. ; Annen, T.: An Enriched Biphasic Model for Solute Driven Degradation. In: PAMM, PAMM. Bd. 9 (2009), Nr. 1, S. 165--166
  - BibTeX
  BibTeX
  @article{Ricken.2009, author = {Ricken, T. and Bluhm, J. and Epple, M. and Wehm{\"o}ller, M. and Annen, T.}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.200910057/asset/165_ftp.pdf?v=1&t=htu9ox6v&s=c296c124141304a4322e0b258a8c42f846174e6e}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {165--166}, title = {{An Enriched Biphasic Model for Solute Driven Degradation}}, volume = 9, year = 2009 }
3. Ricken, Tim ; Robeck, Markus ; Widmann, Renatus: A multiphase finite element simulation of biological conversion processes in landfills. In: PAMM, PAMM. Bd. 9 (2009), Nr. 1, S. 51--54
  - BibTeX
  BibTeX
  @article{Ricken.2009c, author = {Ricken, Tim and Robeck, Markus and Widmann, Renatus}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.200910014/asset/51_ftp.pdf?v=1&t=htu9ps3b&s=bb5b2d51c9c6307d3f2e995ff1f2a96138f50ea7}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {51--54}, title = {{A multiphase finite element simulation of biological conversion processes in landfills}}, volume = 9, year = 2009 }
4. Bluhm, Joachim ; Ricken, Tim ; Bloßfeld, Wolfgang Moritz: Freezing and thawing processes in porous media--Experiment and Simulation. In: PAMM, PAMM. Bd. 9 (2009), Nr. 1, S. 387--388
  - BibTeX
  BibTeX
  @article{Bluhm.2009, author = {Bluhm, Joachim and Ricken, Tim and Blo{\ss}feld, Wolfgang Moritz}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.200910167/asset/387_ftp.pdf?v=1&t=htu9mgft&s=8f9b9f77427c38a6bd610257b1e57e761e36627b}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {387--388}, title = {{Freezing and thawing processes in porous media--Experiment and Simulation}}, volume = 9, year = 2009 }
2008
1. Bluhm, Joachim ; Ricken, Tim ; Bloßfeld, Wolfgang Moritz: Energetische Aspekte zum Gefrierverhalten von Wasser in porösen Strukturen. In: PAMM, PAMM. Bd. 8 (2008), Nr. 1, S. 10483--10484
  - BibTeX
  BibTeX
  @article{Bluhm.2008, author = {Bluhm, Joachim and Ricken, Tim and Blo{\ss}feld, Wolfgang Moritz}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.200810483/asset/10483_ftp.pdf?v=1&t=htu9oqub&s=f898822114947eef735419c6e5baa8e0becea187}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {10483--10484}, title = {{Energetische Aspekte zum Gefrierverhalten von Wasser in por{\"o}sen Strukturen}}, volume = 8, year = 2008 }
2. Schrefler, B. A. (Hrsg.) ; Schrefler, B. A. (Hrsg.): Modeling of porous functionally graded biodegradable implants for bone replacement, 2008
  - BibTeX
  BibTeX
  @proceedings{Schrefler.2008, editor = {Schrefler, B. A.}, file = {9be694c6-d2c9-41dc-bba4-c35abf2a3f83:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\9be694c6-d2c9-41dc-bba4-c35abf2a3f83.pdf:pdf}, title = {{Modeling of porous functionally graded biodegradable implants for bone replacement}}, year = 2008 }
3. Bluhm, Joachim ; Ricken, Tim ; Bloßfeld, Moritz: MODELING OF FREEZING AND THAWING CYCLES OF SATURATED POROUS MEDIA (2008)
  - BibTeX
  BibTeX
  @article{Bluhm.2008b, author = {Bluhm, Joachim and Ricken, Tim and Blo{\ss}feld, Moritz}, title = {{MODELING OF FREEZING AND THAWING CYCLES OF SATURATED POROUS MEDIA}}, year = 2008 }
2007
1. Ricken, Tim ; Schwarz, Alexander ; Bluhm, Joachim: A triphasic model of transversely isotropic biological tissue with applications to stress and biologically induced growth. In: Computational Materials Science, Computational Materials Science. Bd. 39 (2007), Nr. 1, S. 124--136
  - BibTeX
  BibTeX
  @article{Ricken.2007, author = {Ricken, Tim and Schwarz, Alexander and Bluhm, Joachim}, doi = {\url{10.1016/j.commatsci.2006.03.025}}, file = {http://ac.els-cdn.com/S0927025606001364/1-s2.0-S0927025606001364-main.pdf?_tid=4a04165e-c0ce-11e3-bfdb-00000aacb361&acdnat=1397147978_f6ae0e34cca645ad963fc896bf6a15b1}, issn = {0927-0256}, journal = {{Computational Materials Science}}, number = 1, pages = {124--136}, title = {{A triphasic model of transversely isotropic biological tissue with applications to stress and biologically induced growth}}, volume = 39, year = 2007 }
2. Bluhm, Joachim ; Ricken, Tim: Modeling of freezing and thawing processes in liquid filled thermo-elastic porous solids. In: Transport in Concrete: Nano-to Macrostructure, edited by M. Setzer (Aedificatio Publishers, Freiburg, 2007), Transport in Concrete: Nano-to Macrostructure, edited by M. Setzer (Aedificatio Publishers, Freiburg, 2007). (2007), S. 41--57
  - BibTeX
  BibTeX
  @article{Bluhm.2007, author = {Bluhm, Joachim and Ricken, Tim}, journal = {{Transport in Concrete: Nano-to Macrostructure, edited by M. Setzer (Aedificatio Publishers, Freiburg, 2007)}}, pages = {41--57}, title = {{Modeling of freezing and thawing processes in liquid filled thermo-elastic porous solids}}, year = 2007 }
3. Ricken, Tim: Transverse isotropic flow in biphasic materials. In: PAMM, PAMM. Bd. 7 (2007), Nr. 1, S. 4020005--4020006
  - BibTeX
  BibTeX
  @article{Ricken.2007b, author = {Ricken, Tim}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.200700214/asset/4020005_ftp.pdf?v=1&t=htu9o6jx&s=7aff1ee3f8b3f66266e6a552c053a974e4d7b56b}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {4020005--4020006}, title = {{Transverse isotropic flow in biphasic materials}}, volume = 7, year = 2007 }
2006
1. Ustohalova, Veronika ; Ricken, Tim ; Widmann, Renatus: Estimation of landfill emission lifespan using process oriented modeling. In: Waste Management, Waste Management. Bd. 26 (2006), Nr. 4, S. 442--450
  - BibTeX
  BibTeX
  @article{Ustohalova.2006, author = {Ustohalova, Veronika and Ricken, Tim and Widmann, Renatus}, doi = {\url{10.1016/j.wasman.2005.11.012}}, file = {http://ac.els-cdn.com/S0956053X05003089/1-s2.0-S0956053X05003089-main.pdf?_tid=0607ccfe-c47d-11e3-8ae1-00000aacb360&acdnat=1397552880_de15dda237da738ff3e0b43221d08d60}, issn = {0956-053X}, journal = {{Waste Management}}, number = 4, pages = {442--450}, title = {{Estimation of landfill emission lifespan using process oriented modeling}}, volume = 26, year = 2006 }
2. Ricken, Tim: On the Description of Growth in Saturated Living Tissues. In: PAMM, PAMM. Bd. 6 (2006), Nr. 1, S. 137--138
  - BibTeX
  BibTeX
  @article{Ricken.2006b, author = {Ricken, Tim}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.200610049/asset/137_ftp.pdf?v=1&t=htu9nxj7&s=df114e51e0bd399e27771c047e41f9eebc5ac8e4}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {137--138}, title = {{On the Description of Growth in Saturated Living Tissues}}, volume = 6, year = 2006 }
3. Ricken, Tim ; Schwarz, Alexander ; Bluhm, Joachim: A Triphasic Theory for Growth in Biological Tissue--Basics and Applications. In: Materialwissenschaft und Werkstofftechnik, Materialwissenschaft und Werkstofftechnik. Bd. 37 (2006), Nr. 6, S. 446--456
  - BibTeX
  BibTeX
  @article{Ricken.2006, author = {Ricken, Tim and Schwarz, Alexander and Bluhm, Joachim}, file = {62a8756b-d288-4e29-8f85-d3d8a85c657c:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\62a8756b-d288-4e29-8f85-d3d8a85c657c.pdf:pdf}, issn = {1521-4052}, journal = {{Materialwissenschaft und Werkstofftechnik}}, number = 6, pages = {446--456}, title = {{A Triphasic Theory for Growth in Biological Tissue--Basics and Applications}}, volume = 37, year = 2006 }
2005
1. Ricken, T. ; Ustohalova, V.: Modeling of thermal mass transfer in porous media with applications to the organic phase transition in landfills. In: Computational Materials Science, Computational Materials Science. Bd. 32 (2005), Nr. 3, S. 498--508
  - BibTeX
  BibTeX
  @article{Ricken.2005c, author = {Ricken, T. and Ustohalova, V.}, doi = {\url{10.1016/j.commatsci.2004.09.015}}, file = {http://ac.els-cdn.com/S0927025604002319/1-s2.0-S0927025604002319-main.pdf?_tid=55a6b214-c0ce-11e3-98f8-00000aacb361&acdnat=1397147998_3ccb452453cd406ba786560393541ad6}, issn = {0927-0256}, journal = {{Computational Materials Science}}, number = 3, pages = {498--508}, title = {{Modeling of thermal mass transfer in porous media with applications to the organic phase transition in landfills}}, volume = 32, year = 2005 }
2. Ricken, Tim ; de Boer, Reint: Two Phase Flow in Capillary Porous Thermo-Elastic Materials. In: IUTAM Symposium on Physicochemical and Electromechanical Interactions in Porous Media, IUTAM Symposium on Physicochemical and Electromechanical Interactions in Porous Media : Springer, 2005 — ISBN 140203864X, S. 359--364
  - BibTeX
  BibTeX
  @incollection{Ricken.2005, author = {Ricken, Tim and de Boer, Reint}, booktitle = {{IUTAM Symposium on Physicochemical and Electromechanical Interactions in Porous Media}}, file = {http://link.springer.com/10.1007/1-4020-3865-8_42}, isbn = {140203864X}, pages = {359--364}, publisher = {Springer}, title = {{Two Phase Flow in Capillary Porous Thermo-Elastic Materials}}, year = 2005 }
3. Ricken, Tim: On Biological Activities in Organic Materials. In: PAMM, PAMM. Bd. 5 (2005), Nr. 1, S. 441--442
  - BibTeX
  BibTeX
  @article{Ricken.2005b, author = {Ricken, Tim}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.200510197/asset/441_ftp.pdf?v=1&t=htu9nqhu&s=64bbcc7d8a4cd8a5a5cbcb749106fd38cc834df5}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {441--442}, title = {{On Biological Activities in Organic Materials}}, volume = 5, year = 2005 }
2004
1. Ricken, Tim ; de Boer, Reint ; Ustohalova, Veronika ; Widmann, Renatus: Biodegradation in Porous Landfill Bodies (2004)
  - BibTeX
  BibTeX
  @article{Ricken.2004, author = {Ricken, Tim and de Boer, Reint and Ustohalova, Veronika and Widmann, Renatus}, file = {c649283b-9141-46d9-a0fa-d6bd27859fd7:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\c649283b-9141-46d9-a0fa-d6bd27859fd7.pdf:pdf}, title = {{Biodegradation in Porous Landfill Bodies}}, year = 2004 }
2. Ricken, Tim: Mass Transfer in Porous Media. In: PAMM, PAMM. Bd. 4 (2004), Nr. 1, S. 492--493
  - BibTeX
  BibTeX
  @article{Ricken.2004c, author = {Ricken, Tim}, file = {579ea282-0576-46e8-94e8-ee8c46977212:C\:\\Users\\ac130180\\AppData\\Local\\Swiss Academic Software\\Citavi 6\\ProjectCache\\bkyd3fzxdr3rziq0dosvpq10u8ycyepwckx0sx\\Citavi Attachments\\579ea282-0576-46e8-94e8-ee8c46977212.pdf:pdf}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {492--493}, title = {{Mass Transfer in Porous Media}}, volume = 4, year = 2004 }
3. Ricken, Tim ; de Boer, Reint ; de Boer, Reint ; de Boer, Reint: Kapillar induzierte Mehrphasenströmung in porösen Medien : Universität Duisburg-Essen, 2004
  - BibTeX
  BibTeX
  @book{Ricken.2004b, author = {Ricken, Tim and de Boer, Reint and de Boer, Reint and de Boer, Reint}, publisher = {{Universit{\"a}t Duisburg-Essen}}, title = {{Kapillar induzierte Mehrphasenstr{\"o}mung in por{\"o}sen Medien}}, year = 2004 }
2003
1. Ricken, T. ; de Boer, R.: Transport in a capillary thermo--elastic porous material. In: PAMM, PAMM. Bd. 3 (2003), Nr. 1, S. 420--421
  - BibTeX
  BibTeX
  @article{Ricken.2003c, author = {Ricken, T. and de Boer, R.}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.200310481/asset/200310481_ftp.pdf?v=1&t=htu9p6pt&s=cbe6c8d1002c686f774c93736a8f0392e79a988d}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {420--421}, title = {{Transport in a capillary thermo--elastic porous material}}, volume = 3, year = 2003 }
2. Ricken, Tim: Transport of fluids in capillary porous solids. In: PAMM, PAMM. Bd. 2 (2003), Nr. 1, S. 384--385
  - BibTeX
  BibTeX
  @article{Ricken.2003b, author = {Ricken, Tim}, file = {http://onlinelibrary.wiley.com/store/10.1002/pamm.200310176/asset/384_ftp.pdf?v=1&t=htu9ndcb&s=d50e168b60615ded16cbeeb5cf4432c953377f73}, issn = {1617-7061}, journal = {{PAMM}}, number = 1, pages = {384--385}, title = {{Transport of fluids in capillary porous solids}}, volume = 2, year = 2003 }
3. Ricken, Tim ; de Boer, Reint: Multiphase flow in a capillary porous medium. In: Computational Materials Science, Computational Materials Science. Bd. 28 (2003), Nr. 3–4, S. 704--713
  - BibTeX
  BibTeX
  @article{Ricken.2003, author = {Ricken, Tim and de Boer, Reint}, doi = {\url{10.1016/j.commatsci.2003.08.032}}, file = {http://ac.els-cdn.com/S0927025603001551/1-s2.0-S0927025603001551-main.pdf?_tid=4dfd2c0a-c0ce-11e3-9fb6-00000aab0f02&acdnat=1397147985_b6e4ce65d496145b73287d7b8307c36c}, issn = {0927-0256}, journal = {{Computational Materials Science}}, number = {3-4}, pages = {704--713}, title = {{Multiphase flow in a capillary porous medium}}, volume = 28, year = 2003 }
2002
1. Ricken, Tim: Kapillarität in porösen Medien: theoretische Untersuchung und numerische Simulation, Universität Essen, PhD-Thesis, 2002
  - BibTeX
  BibTeX
  @phdthesis{Ricken.2002, author = {Ricken, Tim}, school = {{Universit{\"a}t Essen}}, title = {{Kapillarit{\"a}t in por{\"o}sen Medien: theoretische Untersuchung und numerische Simulation}}, type = {{PhD-Thesis}}, year = 2002 }
1994
1. de Boer, R. ; Bluhm, J. ; Waehling, M. ; Ricken, T. ; Essen Univ.. Fachbereich 10-Bauwesen: Phase transition in porous media (1994)
  - BibTeX
  BibTeX
  @article{Boer.1994, author = {de Boer, R. and Bluhm, J. and Waehling, M. and Ricken, T. and {Essen Univ.. Fachbereich 10-Bauwesen}}, title = {{Phase transition in porous media}}, year = 1994 }

Lehre

Einführung in die Festigkeitslehre

Technische Mechanik I

Technische Mechanik III

Statik

Einführung in die Finite-Elemente-Methode

Statik III (Einführung in die lineare Kontinuumsmechanik)

Lebenslauf

Curriculum Vitae

Tim Ricken

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2020

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2019

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BibTeX

BibTeX

BibTeX

BibTeX

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BibTeX

BibTeX

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BibTeX

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BibTeX

Link

2018

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BibTeX