This paper represents the impact of beam thickness and air gap upon the performance of cantilever MEMS switches having different beam materials (Al, Au metals). A comparative analysis of spring constant, effective mass, pull-in voltage, capacitance of cantilever based MEMS switch has been performed by 3D simulation using COMSOL Multiphysics based on Finite Element Method [FEM]. Different parame...

This article explores a non-invasive method to determine interstitial fluid level and pressure in tissue. Interdigital electrodes were chosen by simulated results in software "Comsol multiphysis 4.3a". Environment model similar to human body was created. Measurements were carried out at different situations which can occur during preoperative and afterwards surgery. Non-invasive method decrease...

The convergence of finite element methods for elliptic and parabolic partial differential equations is well-established if source terms are sufficiently smooth. Noting that finite element computation is easily implemented even when the source terms are measure-valued — for instance, modeling point sources by Dirac delta distributions — we prove new convergence order results in two and three dim...

In the study, the activation propagation velocity in cardiac tissue was simulated in COMSOL Multiphysics environment using the modified FitzHugh-Nagumo model of the electrical excitation. The influence of different model parameters and stimulation conditions on the activation propagation velocity was evaluated. The homogeneous slab model was used as the model of the atrial wall. Results of simu...

The finite-element method (FEM) (Comsol RF Module) has been employed for modal analyses of porous silicon (PSi) waveguides composed of a guiding layer of low porosity (high refractive index) on a cladding layer with higher porosity (lower refractive index). These can be made by switching the current density from a lower to a higher value during the electrochemical etching process. The applicabi...

For low-field NMR, NdFeB permanent magnet arrangements are proposed to provide the static polarizing magnetic field. Especially a parallel and a circular arrangement of the permanent magnets, iron yokes and small shim magnets were tested and improved by COMSOL. The intent was to guide the design and the construction of NMR magnets by calculating the magnetic field strength and the associated fi...

Study of neurons plays a key role in the fields of basic and medical research aiming at the development of electrically active implants. The Fitzhugh-Nagumo equations are used to model and simulate the spike generation and propagation in a squid giant axon using Comsol Multiphysics® 3.5a Software. It is shown that the Fitzhugh-Nagumo equations allow for a geometrical explanation of important bi...

Abstract—Conjugate natural convection in a differentially heated square enclosure containing a polygon shaped object is studied numerically in this article. The effect of various polygon types on the fluid flow and thermal performance of the enclosure is addressed for different thermal conductivities. The governing equations are modeled and solved numerically using the built-in finite element m...

The paper presents the performance optimization of a MEMS accelerometer based microphone for the fully implantable hearing application. A genetic algorithm is employed to optimize the device geometry parameters satisfying the design constraints. The analytical model run on MATLAB and the simulation model implemented in COMSOL MULTIPHYSICS 4.2 show good agreement. Optimization with Genetic algor...

A Normal Mode Analysis (NMA) of the Chesapeake Bay was performed using Neumann boundary conditions and COMSOL MultiPhysics (formerly known as FEMLAB). The lowest 100 eigenstates were calculated and compared to a finite difference solution. Based on the normal modes derived numerically, surface current vector fields can be calculated. The vector fields of the Chesapeake Bay provide tools for the...