نتایج جستجو برای: viscoelastic parameters

تعداد نتایج: 590351  

Journal: :Medical image computing and computer-assisted intervention : MICCAI ... International Conference on Medical Image Computing and Computer-Assisted Intervention 2008
Edoardo Mazza Patrick Grau Marc Hollenstein Michael Bajka

In vivo aspiration experiments on human livers are analyzed and material parameters for a non-linear-viscoelastic constitutive model are determined. A novel procedure is applied for the inverse analysis that accounts for the initial tissue deformation in the experiment and for the non-homogeneity of liver tissue. A numerical model is used consisting of a surface layer (capsule) and an underlyin...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2003
Nikolai Brilliantov Thorsten Pöschel

The hydrodynamics of granular gases of viscoelastic particles, whose collision is described by an impact-velocity dependent coefficient of restitution, which is developed using the Chapman-Enskog approach. We derive the hydrodynamic equations and the according transport coefficients with the assumption that the shape of the velocity distribution function follows adiabatically the decaying tempe...

Journal: :Journal of vestibular research : equilibrium & orientation 1990
J W Grant J R Cotton

The otolith organs were modeled mathematically as a 3-element system consisting of a viscous endolymph fluid in contact with a rigid otoconial layer that is attached to the skull by a gel layer. The gel layer was considered to be viscoelastic solid, and was modeled as a simple Kelvin material. The governing differential equations of motion were derived and nondimensionalized, yielding 3 nondime...

Soil is a nonrenewable source that needs considerable management to prevent physical deteriorationby erosion and compaction. Compacted soil causes low fertility and yield. The purpose of this study isto investigate the effect of viscoelastic properties of soil and to determine important factors oncompaction. Furthermore, stress distribution, prediction of soil compaction and simulation of its e...

Journal: :Journal of applied physiology 2006
Boris Lande Wayne Mitzner

The dynamic behavior of the lung in health and disease depends on its viscoelastic properties. To better understand these properties, several mathematical models have been utilized by many investigators. In the present work, we present a new approach that characterizes the dynamics of gas flow into a viscoelastic porous medium that models the lung structure. This problem is considered in terms ...

2016
Saskia Wand Matthias Klages Christin Kirbach Joanna Warszawska Patrick Meybohm Kai Zacharowski Alexander Koch

INTRODUCTION Sepsis remains associated with a high mortality rate. Endotoxin has been shown to influence viscoelastic coagulation parameters, thus suggesting a link between endotoxin levels and the altered coagulation phenotype in septic patients. This study evaluated the effects of systemic polyspecific IgM-enriched immunoglobulin (IgM-IVIg) (Pentaglobin® [Biotest, Dreieich, Germany]) on endot...

2013
A. Jalali

This paper presents a numerical simulation of the developing flow and heat transfer of a viscoelastic fluid in a rectangular duct. In fully developed flow of a viscoelastic fluid in a non-circular duct, secondary flows normal to the flow direction are expected to enhance the rate of heat and mass transfer. On the other hand, properties such as viscosity, thermal conductivity, specific heat and ...

Journal: :Journal of the mechanical behavior of biomedical materials 2014
Philippe Abdel-Sayed Mohamadreza Nassajian Moghadam Rares Salomir David Tchernin Dominique P Pioletti

Metabolism of proteoglycans and hyaluronic acid has been shown to be temperature-dependent in cartilage explants, with optimal anabolic effects between 36°C and 38°C. At rest, the temperature of human knee has a value of around 33°C. We aim to show in this study that viscoelastic properties of healthy human cartilage allow its temperature to reach those optimal temperatures during physiological...

2012
Kaspar-Josche Streitberger Ingolf Sack Dagmar Krefting Caspar Pfüller Jürgen Braun Friedemann Paul Jens Wuerfel

INTRODUCTION Viscoelastic properties indicate structural alterations in biological tissues at multiple scales with high sensitivity. Magnetic Resonance Elastography (MRE) is a novel technique that directly visualizes and quantitatively measures biomechanical tissue properties in vivo. MRE recently revealed that early relapsing-remitting multiple sclerosis (MS) is associated with a global decrea...

2012
Nima Toosizadeh Maury A. Nussbaum Babak Bazrgari Michael L. Madigan

Experimental studies suggest that prolonged trunk flexion reduces passive support of the spine. To understand alterations of the synergy between active and passive tissues following such loadings, several studies have assessed the time-dependent behavior of passive tissues including those within spinal motion segments and muscles. Yet, there remain limitations regarding load-relaxation of the l...

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