Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Designing Piezoelectric Interdigitated Microactuators using COMSOL

O. Myers [1], M. Anjanappa [2], and C. Freidhoff [3]

[1] Mississippi State University, Mississippi State, MS, USA
[2] University of Maryland Baltimore County, Baltimore, MD, USA
[3] Northrop Grumman Corporation, Electronics Systems Sector, Baltimore, MD, USA

This paper presents a methodology towards designing, analyzing and optimizing piezoelectric interdigitated microactuators using COMSOL Multiphysics. The models used in this study were based on a circularly interdigitated design that takes advantage of primarily the d33 electromechanical piezoelectric constant coefficient. Because of the symmetric nature of the devices, 2D axisymmetric models ...

Magnetic Nanoparticles for Novel Granular Spintronic Devices

A. Regtmeier[1], A. Weddemann[2], I. Ennen[3], and A. Hütten[1]
[1]Dept. of Physics, Thin Films and Physics of Nanostructures, Bielefeld University, Bielefeld, Germany
[2]Dept. of Elect. Eng. and Comp. Science, Lab. for Electromagnetic and Electronic Syst., MIT, Cambridge, MA
[3]Institute of Solid State Physics, Vienna University of Technology, Vienna, Austria

Superparamagnetic nanoparticles have a wide range of applications in modern electric devices. Recent developments have identi fied them as components for a new type of magnetoresistance sensor. We propose a model for the numeric evaluation of the sensor properties. Based on the solutions of the Landau-Lifshitz-Gilbert equation for a set of homogeneously magnetized spheres arranged in highly ...

Microfluidic Separation System for Magnetic Beads

F. Wittbrach, A. Weddemann, A. Auge, and A. Hütten
Department of Physics, Bielefeld University, Germany

It is possible to control the motion of magnetic beads using a combination of hydrodynamic and electromagnetic forces. In this work, we investigate the possibility to manipulate the motion of beads with different magnetic moments in a special microfluidic structure so as to separate them. We also experimentally prove that this structure is a suitable device to separate beads and show that the ...

Thermally Induced-Noise Reduction Using an Electrostatic Force Feedback

H. Lee, and J.V. Clark
Purdue University, West Lafayette, IN, USA

In this paper we present a method to mitigate the effect of thermally-induced noise in Micro-Electro-Mechanical Systems (MEMS) through a force feedback circuit. Inherent noise-induced vibrations, which would be inconsiderable in macro scale, are considered as a limitation in micro- and nano- scale since it diminishes the high performance of MEMS devices. For instance, depending on the stiffness ...

Strong Magnetic Field and Its Application

Y. Song
Huazhong University of Science and Technology, Wuhan, China

High magnetic field research has yielded fruitful results. Since 1913, associated with the magnetic field there are 19 Nobel Prizes, including a prize for medicine, five chemistry prizes, and 13 physics prizes. In recent years, the international community under the conditions of strong magnetic field is very active in scientific research, involving many disciplines such as physics, chemistry, ...

Air Convection on a Micro Hotplate Gas Sensor

S. Gidon[1], M. Brun[1], S. Nicoletti[1], P. Barritault[1]
[1]Commissariat Energie Atomique, LETI, Minatec Campus, Grenoble, France

Monitoring of indoor CO2 concentration is of particular interest to detect room occupancy in order to optimize power consumptions of building. One approach to monitor the indoor CO2 concentration is to use optical detection using specific absorption lines of CO2 molecules in the infrared domain close to 4.2 µm. Such optical sensors include a detector, typically a micro-bolometer, an IR source ...

COMSOL在压阻式柔性压力传感器中的应用

王宗荣 [1,2], 王珊 [1],
[1] 浙江大学,杭州,中国
[2] 香港大学,香港,中国

引言:柔性压力传感器在电子皮肤、智能假肢以及医疗监测诊断等领域发挥着十分重要的作用。因此压力传感器需要很高的灵敏度、较宽的敏感区间及稳定的性能。利用典型有机硅 PDMS 作为支撑层,聚合物 PEDOT: PSS 作为导电感应层制得的高度不均一微突结构的双压敏机制压阻传感器灵敏度达到了 851kPa-1。其探测范围广,性能优异,为解决目前压阻传感器中灵敏度低、敏感压力区间窄的难题提供了新思路。 COMSOL MULTIPHYSICS® 软件的使用:本文利用 COMSOL Multiphysics® 软件建立了不均匀微突结构的压阻式传感器模型,采用了结构力学与电流场两个物理场,通过电子接触对进行多物理场的耦合。研究在指定位移情况下,压阻式传感器电阻与电流的变化,从而得到灵敏度,验证不均匀微突结构压阻式压力传感器的双作用机制。同时,与均一微金字塔结构的压力传感器进行比较 ...

Numerical Analysis of the Impact of Geometric Shape Patterns on the Performance of Miniaturized Chromatography Systems

R. Winz[1], E. von Lieres[2], and W. Wiechert[1]
[1]Department of Simulation, University of Siegen, Siegen, Germany
[2]Institute of Biotechnology, Research Centre Jülich, Siegen, Germany

We have implemented a two dimensional chromatography model for the analysis and optimization of structured micro pillar arrays. Dynamic surface interaction of solved molecules is taken into account by the kinetic Langmuir model. Variations of the pillar array geometry lead to deviations in the outlet concentration profiles. These deviations cannot be described by the one dimensional models that ...

Contactless Excitation of MEMS Resonant Sensors by Electromagnetic Driving

M. Baù[1], V. Ferrari[1], and D. Marioli[1]
[1]Department of Electronics for Automation, University of Brescia, Brescia, Italy

A contactless electromagnetic principle for the excitation of mechanical vibrations in resonant structures has been investigated. The principle relies on no specific magnetic property of the resonator except electrical conductivity and can be adopted for employing the structures as resonant sensors for measurements either in environments not compliant with the requirements of active electronics ...

The 3D Mixed-Dimensional Quench Model of a High Aspect Ratio High Temperature Superconducting Coated Conductor Tape

W.K. Chan[1,2], J. Schwartz[2], P. Masson[3], and C. Luongo[4]
[1]FAMU-FSU College of Engineering, Tallahassee, FL, USA
[2]North Carolina State University, Raleigh, NC, USA
[3]Advanced Magnet Lab, Palm Bay, FL, USA
[4]ITER Organization/Magnet Division, Saint Paul-lez-Durance, France

A successful development of an effective quench detection and protection method for a high temperature superconducting (HTS) coil based on a HTS coated conductor tape lays on a thorough understanding of its slowly propagating, three-dimension (3D) quench behavior. Toward this goal, a 3D micrometer scale finite element (FE) thermo-magnetostatic HTS tape model is developed and implemented in ...