@article{BhattaraiHorbachStaatetal.2022,
  author    = {Bhattarai, Aroj and Horbach, Andreas and Staat, Manfred and Kowalczyk, Wojciech and Tran, Thanh Ngoc},
  title     = {Virgin passive colon biomechanics and a literature review of active contraction constitutive models},
  series = {Biomechanics},
  volume    = {2},
  journal   = {Biomechanics},
  number    = {2},
  publisher = {MDPI},
  address   = {Basel},
  issn      = {2673-7078},
  doi       = {10.3390/biomechanics2020013},
  pages     = {138 -- 157},
  year      = {2022},
  abstract  = {The objective of this paper is to present our findings on the biomechanical aspects of the virgin passive anisotropic hyperelasticity of the porcine colon based on equibiaxial tensile experiments. Firstly, the characterization of the intestine tissues is discussed for a nearly incompressible hyperelastic fiber-reinforced Holzapfel-Gasser-Ogden constitutive model in virgin passive loading conditions. The stability of the evaluated material parameters is checked for the polyconvexity of the adopted strain energy function using positive eigenvalue constraints of the Hessian matrix with MATLAB. The constitutive material description of the intestine with two collagen fibers in the submucosal and muscular layer each has been implemented in the FORTRAN platform of the commercial finite element software LS-DYNA, and two equibiaxial tensile simulations are presented to validate the results with the optical strain images obtained from the experiments. Furthermore, this paper also reviews the existing models of the active smooth muscle cells, but these models have not been computationally studied here. The review part shows that the constitutive models originally developed for the active contraction of skeletal muscle based on Hill's three-element model, Murphy's four-state cross-bridge chemical kinetic model and Huxley's sliding-filament hypothesis, which are mainly used for arteries, are appropriate for numerical contraction numerical analysis of the large intestine.},
  language  = {en}
}
@article{UllrichGrottkeRossaintetal.2010,
  author    = {Ullrich, Sebastian and Grottke, Oliver and Rossaint, Rolf and Staat, Manfred and Deserno, Thomas M. and Kuhlen, Torsten},
  title     = {Virtual Needle Simulation with Haptics for Regional Anaesthesia},
  pages     = {1 -- 3},
  year      = {2010},
  language  = {en}
}
@article{BartellaKamalScholletal.2019,
  author    = {Bartella, Alexander K. and Kamal, Mohammad and Scholl, Ingrid and Schiffer, Stefan and Steegmann, Julius and Ketelsen, Dominik and H{\"o}lzle, Frank W. and Lethaus, Bernd},
  title     = {Virtual reality in preoperative imaging in maxillofacial surgery: implementation of "the next level"?},
  series = {British Journal of Oral and Maxillofacial Surgery},
  volume    = {57},
  journal   = {British Journal of Oral and Maxillofacial Surgery},
  number    = {7},
  publisher = {Elsevier},
  address   = {Amsterdam},
  issn      = {0266-4356},
  doi       = {10.1016/j.bjoms.2019.02.014},
  pages     = {644 -- 648},
  year      = {2019},
  language  = {en}
}
@article{Gebhardt2002,
  author    = {Gebhardt, Andreas},
  title     = {Virtual Reality oder Rapid Prototyping?},
  series = {Zeitschrift f{\"u}r die gesamte Wertsch{\"o}pfungskette Automobilwirtschaft (2002)},
  journal   = {Zeitschrift f{\"u}r die gesamte Wertsch{\"o}pfungskette Automobilwirtschaft (2002)},
  year      = {2002},
  language  = {de}
}
@article{Starke2001,
  author    = {Starke, G{\"u}nther},
  title     = {Virtual Reality und Simulation als integrierte Werkzeuge f{\"u}r die Entwicklung mechatronischer Systeme},
  series = {VDI-Berichte. 1631 (2001)},
  journal   = {VDI-Berichte. 1631 (2001)},
  isbn      = {0083-5560},
  pages     = {1 -- 17},
  year      = {2001},
  language  = {de}
}
@article{ReisgenSchleserMokrovetal.2011,
  author    = {Reisgen, Uwe and Schleser, Markus and Mokrov, Oleg and Zabirov, Alexander},
  title     = {Virtual welding equipment for simulation of GMAW processes with integration of power source regulation},
  series = {Frontiers of materials science},
  volume    = {Vol. 5},
  journal   = {Frontiers of materials science},
  number    = {Iss. 2},
  publisher = {Springer},
  address   = {Berlin},
  issn      = {2095-0268 (E-Journal); 2095-025X (Print)},
  pages     = {79 -- 89},
  year      = {2011},
  language  = {en}
}
@article{Siedenbiedel1999,
  author    = {Siedenbiedel, Georg},
  title     = {Virtuelle Organisation und F{\"u}hrungsverhalten},
  series = {Strategische Personalpolitik : Festschrift f{\"u}r Prof. Dr. Dudo von Eckardstein},
  journal   = {Strategische Personalpolitik : Festschrift f{\"u}r Prof. Dr. Dudo von Eckardstein},
  publisher = {Hampp},
  address   = {M{\"u}nchen [u.a.]},
  pages     = {271 -- 306},
  year      = {1999},
  language  = {de}
}
@article{SchmitzVomHemdtBreitschuhetal.2002,
  author    = {Schmitz, G{\"u}nter and Vom Hemdt, A. and Breitschuh, S. and Graber, S.},
  title     = {Virtuelle Praktika f{\"u}r die Ingenieurausbildung},
  series = {NetWorlds : Leben und Arbeiten in vernetzten Welten ; VDE-Kongress 2002, 21. bis 23. Oktober 2002 in Dresden / Gesamtleitung: J. Ebersp{\"a}cher},
  journal   = {NetWorlds : Leben und Arbeiten in vernetzten Welten ; VDE-Kongress 2002, 21. bis 23. Oktober 2002 in Dresden / Gesamtleitung: J. Ebersp{\"a}cher},
  publisher = {VDE-Verl.},
  address   = {Berlin [u.a.]},
  isbn      = {3-8007-2723-4},
  pages     = {69 -- 74},
  year      = {2002},
  language  = {de}
}
@article{KaemperMertenBrilletal.2003,
  author    = {K{\"a}mper, Klaus-Peter and Merten, Sabine and Brill, Manfred and Cassel, Detlev (u.a.)},
  title     = {Virtuelle Sensor-Fertigung: Hightech mit LabVIEW},
  series = {Virtuelle Instrumente in der Praxis : Messtechnik, Automatisierung ; Begleitband zum Kongress VIP 2003 / Rahman Jamal ; Hans Jaschinski (Hrsg.)},
  journal   = {Virtuelle Instrumente in der Praxis : Messtechnik, Automatisierung ; Begleitband zum Kongress VIP 2003 / Rahman Jamal ; Hans Jaschinski (Hrsg.)},
  publisher = {H{\"u}thig},
  address   = {Heidelberg},
  isbn      = {3-7785-2908-0},
  pages     = {465 -- 470},
  year      = {2003},
  language  = {de}
}
@article{ElsenKraissKrumbiegeletal.1999,
  author    = {Elsen, Ingo and Kraiss, Karl-Friedrich and Krumbiegel, Dirk and Walter, Peter and Wickel, Jochen},
  title     = {Visual information retrieval for 3D product identification: a midterm report},
  series = {KI - K{\"u}nstliche Intelligenz},
  volume    = {13},
  journal   = {KI - K{\"u}nstliche Intelligenz},
  number    = {1},
  publisher = {Springer},
  address   = {Berlin},
  issn      = {1610-1987},
  pages     = {64 -- 67},
  year      = {1999},
  language  = {en}
}