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Microfluidic devices and lab-on-a-chip (LOC) require the ability to transport or pump reagents or reaction products, the ability to effectively mix small volumes of fluid, and provide direct data display. Surface acoustic wave (SAW) driven acoustic streaming generated by a piezoelectric ... Mehr lesen
In this paper a finite element method(FEM) study of a surface acoustic wave (SAW)device excited by electrostatic coupling method is performed by using COMSOL Multiphysics. We have modeled a Rayleigh wave type SAW device by choosing YZ Lithium niobate as the substrate. The effect of ... Mehr lesen
Since the last few decades, the researchers are focused on new sensor material and novel design structure with high performances. Today various technologies are available but SAW sensors are preferable because of its characteristics such as low cost, low power, lightweight, rugged, ... Mehr lesen
近年来,随着智能手机的普及和移动通讯技术的不断升级,对高频高性能SAW器件的需求也出现了激增之势。由于具有高的声速,包含金刚石的多层膜结构SAW器件成为了人们研究的热点。多层膜结构除了要具有高的相速度和大的机电耦合系数外,还需要IDT具有大的反射系数来设计低损耗和小尺寸的SAW器件 ,而电极厚度是影响反射系数的重要因素。本文利用COMSOL中的压电设备模块研究了ZnO/金刚石结构中Rayleigh波的m1和m2模式在最大机电耦合系数处的电极效应。仿真了ZnO/金刚石结构单端谐振器声表面波器件,计算了不同电极厚度下SAW的相速度、机电耦合系数和反射系数 ... Mehr lesen
New drug discovery and development is costly; of all compounds investigated for use in humans, only a small fraction is approved for treatments around the world. The pharmaceutical industry has started switching from molecular drugs to protein-based drugs due to high specificity, ... Mehr lesen
Arches being one of the most aesthetic and stable form of structural elements, have been constantly used since hundreds of years in various form of constructions be it buildings, bridges or any other structural system. Though, common use of reinforced concrete framed structures has ... Mehr lesen
The paper presents finite element simulation of a surface acoustic wave (SAW) linear motor. The function of SAW linear motor depends on the principle of friction drive provided by SAW propagating on a piezoelectric substrate. The SAW motor comprises of a slider driven by Rayleigh wave ... Mehr lesen
The design of surface acoustic wave (SAW) devices needs the accurate study of the scattering fields, arising from the interaction of SAW with periodic irregularities placed on a surface of crystal to form interdigital transducers or reflective structures (RS). To solve this problem, the ... Mehr lesen
The dispersion of surface acoustic waves (SAWs) has long been studied for diverse applications ranging from seismic waves to microelectronic filters. In this work, we apply COMSOL Multiphysics software for the finite element investigation of SAW dispersion in two inhomogeneous ... Mehr lesen
The Poisson equation, as implemented in the COMSOL Multiphysics® AC/DC module, solves for the electrostatic potential due to general charge distributions subject to various boundary conditions, very often Dirichlet conditions of constant potential at conductor surfaces. When both the ... Mehr lesen