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...

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...

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...

Modeling of migrating cells often requires sophisticated numerical tools necessary for solving highly nonlinear partial and ordinary differential equations in domains with moving boundaries. We have recently developed a novel conservative method [1] for simulating reactions and transport in moving domains, which combines an Eulerian approach with tracking an explicit boundary. The latter is imp...

The aim of this paper is to introduce a method for creating a homogenous substitute material for composite materials using optimisation algorithms. Composite materials are modern construction materials used, for example, in aircraft construction. However, numerical modelling of these materials is, due to its multi-layer structure, very difficult to compute. This multi-layer structure and loss m...

هدف پژوهش حاضر پیش‌بینی اعتیاد به اینترنت بر پایه‌ مهرورزی والدین و مهارت‌های اجتماعی با توجه نقش واسطه‌ای احساس تنهایی در دانش‌آموزان پایه نهم شهر یزد بود. جامعه‌ آماری شامل تمام سال تحصیلی 98-97 بود که از میان آن‌ها استفاده روش نمونه‌گیری خوشه‌ای صورت تصادفی تعداد 260 نفر انتخاب شدند. پرسش‌نامه‌های یانگ، بوری، ایندربیتزن دهشیری روی آزمودنی‌ها اجرا شد. سپس داده‌ها نرم افزار SPSS-16 Amos-21 آزم...

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...

In this paper, symmetric water entry of twin wedges is investigated for deadrise angle of 30 degree. Three numerical simulation of a symmetric impact, considering rigid body dynamic equations of motion in two-phase flow is presented. The two-phase flow around the wedges is solved by Finite Element based on Finite Volume method (FEM-FVM) which is used in conjunction with Volume of Fluid (VOF) sc...

INTRODUCTION: Micro Electro Mechanical Systems (MEMS) are fabricated with an in-plane fabrication technology. Out-of-plane structures can be designed to be assembled to provide thermal and electrical isolation from the substrate [1 -3]. These isolations can potentially improve the performance of a range of MEMS devices by decreasing any unwanted coupling effects or parasitic losses from the dev...