#Comsol multiphysics 4.2 tutorial how to#
#Comsol multiphysics 4.2 tutorial software#

#Comsol multiphysics 4.2 tutorial how to#

The goal is to learn how to model an experiment in order to see what we really measure, and to gain insight in volume impedance measurements in general. This tutorial will show how to create such a model and how to perform a virtual experiment on it.

#Comsol multiphysics 4.2 tutorial software#

This solution is becoming more interesting as computers and software becomes increasingly capable. One solution to this problem is to create a model where we can see and even quantify the contribution from tissues and organs. And even if we find a set-up that we think is good, we still do not know how much each tissue or organ has contributed to the final measurement result. However, it is obviously time-consuming for both the persons who do the tests and for the test-subjects, and there may be medical reasons to avoid such tests if not absolutely necessary. One way to solve this problem is to test a number of set-ups on a number of test-subjects with and without the given condition. For example, if we are to use bioimpedance measurements to diagnose a condition, we need to be sure that our set-up actually detects the given condition. This means that electrical bioimpedance measurements, in general, has good sensitivity but poor specificity.Īs a result, it may be a challenge to create measurement set-ups of clinical value. Unfortunately, it is difficult to establish a link between measured impedance change and a change in one or more of the input variables.

Electrical impedance in tissues is a function of variables such as ion concentrations, cell geometry, extracellular fluids, intracellular fluids, and organ geometry, so it is easy to imagine that sensitivity to different changes in these variables may be detectable. These are all desirable properties in a clinical setting.

It requires little equipment, can be done with small and simple units, and due to the simplicity of the equipment, it may be made low-cost. Aufl., 2005.Measurement of electrical bioimpedance is relatively easy to do. Partielle Differentialgleichungen und numerische Methoden. Society for Industrial and Applied Mathematics, 2. The Finite Element Method for Elliptic Problems. The Mathematical Theory of Finite Element Methods. Freezing Rotating Waves in Damped Wave Equationsĭamped cubic-quintic complex Ginzburg-Landau equation Freezing Traveling Waves in Damped Wave EquationsĨ. Further coherent structures in Reaction Diffusion Systemsįreezing Relative Equilibria in Equivariant Second-Order Evolution Equations (with Comsol Multiphysics 5.1 and 5.2) 7. Spinning 3-soliton (rotating multisoliton)Ħ. Spinning 2-soliton (rotating multisoliton) Traveling oscillating 2-front (traveling oscillating multifront) Oscillating pulse and traveling oscillating front Oscillating 2-pulse (oscillating multipulse) Traveling 2-front (collision, colliding fronts) Traveling 2-front (traveling multifront, repelling fronts) Freezing Multistructures (Multifronts, Multipulses and Multisolitons) and Wave Interactions in Reaction Diffusion Systems Freezing Waves with Several Symmetries in Reaction Diffusion Systemsĥ. Spinning soliton, dissipative soliton, rotating solitonĤ. Freezing Rotating Waves in Reaction Diffusion Systems Freezing Oscillating Waves in Reaction Diffusion EquationsĬubic-quintic complex Ginzburg-Landau equationģ. Freezing Traveling Waves in Reaction Diffusion EquationsĢ. Freezing traveling waves with Comsol Multiphysics: The Nagumo equationįreezing Relative Equilibria in Equivariant First-Order Evolution Equations (with Comsol Multiphysics 5.1 and 5.2) 1.8.3 Numerical approximation of rotating waves via freezing methodįor the implementation we suggest the following tutorials