Aqui você encontrará apresentações realizadas nas Conferências de Usuários COMSOL de todo o mundo. As apresentações englobam pesquisas e produtos inovadores feitas por engenheiros e cientistas usando o COMSOL Multiphysics. Os tópicos abrangem uma grande gama de indústrias e aplicações, como elétrica, mecânica, escoamento e química. Use a função de busca "Quick Search" para encontrar apresentações na sua área de interesse.

Design of a Dielectrophoretic Based Micropipette for Gene Expression Applications Using COMSOL Multiphysics® Software

D. Wijesinghe [1], K. Nawarathna [1],
[1] Department of Electrical and Computer Engineering, North Dakota State University, Fargo, ND, USA

We have used COMSOL Multiphysics® software to design a micropipette for single -cell gene expression profiling. The micropipette design allows us to insert it into a single-cell to extract genes through dielectrophoresis. As dielectriphoretic force depends on the applied electric field (E) and its gradient (∇E^2), we have successfully used COMSOL to calculate E and ∇E^2 in the vicinity of the ...

Investigation of Ion Interactions and Space Charge Effects in a Time of Flight Ion Trap Resonator

D. Bayat [1], I. Kjelberg [1], G. Spinola Durante [2], D. Schmid [3]
[1] CSEM SA, Neuchatel, Switzerland
[2] CSEM SA, Alpnach, Switzerland
[3] CSEM SA, Landquart, Switzerland

An ion trap resonator, used for mass spectrometry, is investigated. Simulations are used to define the stabilization criterion of ion trajectories by optimization of the electrode configurations. The ion interactions are investigated and shown to help in reduction of ion-diffusion. Space charge effects simulate the induced voltages on pickup electrodes.

Asymmetry Induced Terminal Voltage Improvement in Mg2Si-based Thermoelectric Unicouple

P. Priyadarshi [1], J. Bahl [1], B. Muralidharan [1]
[1] Indian Institute of Technology Bombay, Mumbai, India

Thermoelectric power generation has been envisioned as a clean energy alternative to conventional thermal to electric power generation for decades due to its noiseless and low-cost operation. However, a typical thermoelectric generator suffers from low device efficiency, so it has been a constant endeavor for thermoelectric researchers’ community to consider alternate thermoelectric materials ...

Model of Selective Field Deformation in Deep Brain Stimulation (DBS)

L. Roohisefat [1], S. Mottaghi [2], M. Li [3], U. G. Hofmann [4], V. A. Coenen [5],
[1] Department of Stereotactic and Functional Neurosurgery, Medical Faculty, Freiburg University. Department of Neurosurgery, Section for Neuroelectronic Systems, Medical Center, Freiburg University, Freiburg, Germany
[2] Department of Neurosurgery, Section for Neuroelectronic Systems, Medical Center, Freiburg University, Freiburg, Germany
[3] Department of Stereotactic and Functional Neurosurgery, Medical Faculty, Freiburg University, Freiburg, Germany
[4] Department of Neurosurgery, Section for Neuroelectronic Systems, Medical Center, Freiburg University. Cluster of Excellence „BrainLinks-BrainTools“,DFG EXC 1086, Freiburg, Germany
[5] Department of Stereotactic and Functional Neurosurgery, Medical Faculty, Freiburg University. Cluster of Excellence „BrainLinks-BrainTools“,DFG EXC 1086, Freiburg, Germany

Deep Brain Stimulation (DBS) is known to alleviate symptoms of some movement disorders and is currently tested for its clinical value in several psychiatric disorders. Although the exact mechanism of DBS is not well understood yet, an activation of white matter structures is the most likely one. The spatial distribution of the electric field originating from implanted DBS electrodes is ...

Identification and Analysis of Low-Frequency Cogging Torque Component in Permanent Magnet Machines

D. McIntosh
Sonsight Inc. / NSWC, Accokeek, MD, USA

Cogging torque in permanent magnet motors and generators is characterized by a torque ripple. These torque fluctuations cause vibrations, noise and speed fluctuations. This paper presents finite element (FE) analyses results that show a previously unaddressed low frequency modulation of cogging torque ripple. The paper resulted in an analytical formulation of cogging torque with low frequency ...

Finite Element Modeling of Transient Eddy Currents in Multilayer Aluminum Structures

V. Babbar[1], and T. Krause[1]

[1]Department of Physics, Royal Military College of Canada, Kingston, Ontario, Canada

Transient eddy current (TEC) technique is being developed for detection of flaws located at depth within multilayer aluminum structures. The present work involves finite element modeling using COMSOL Multiphysics software to simulate different types of probes by changing some of these parameters in an attempt to generate an output signal of optimum magnitude and shape. Some of the model results ...

Analysis of Multiconductor Quasi-TEM Transmission Lines and Multimode Waveguides

S.M. Musa[1], M.N.O. Sadiku[1], and O.D. Momoh[2]
[1]Prairie View A&M University, Prairie View, TX, USA
[2]Indiana University-Purdue University, Fort Wayne, IN, USA

This paper presents an analysis approach of multicondcutor quasi-TEM lines transmission interconnect in a single dielectric region and multimode waveguides using the finite element method (FEM). FEM is especially suitable and effective for the computation of electromagnetic fields in strongly inhomogeneous media. We illustrate that FEM is suitable and effective as other methods for modeling of ...

Optimization of Artificial Diffusion Stabilization Techniques and Corresponding Mesh Density Distribution in Drift Dominated Transport of Diluted Species

J. Jadidian[1], M. Zahn[1], N. Lavesson[2], O. Widlund[2], K. Borg[2]
[1]Massachusetts Institute of Technology, Cambridge, MA, USA
[2]ABB Corporate Research, Västerås, Sweden

This paper presents an optimized combination of artificial diffusion techniques to stabilize a drift dominated streamer discharge model which includes COMSOL Multiphysics’ Transport of Diluted Species modules for positive ion, negative ion, and electron charge densities, coupled through the Electrostatic module. A Thermal Conduction and Convection module is responsible for the heat transfer in ...

FEM Modeling of Electric Field and Potential Distributions of MV XLPE Cables Containing Void Defect

M. Alsharif[1], P. Wallace[2], D. Hepburn[2], C. Zhou[2]
[1]Department of Physics, Faculty of Arts, Sebha University, Sebha, Libya
[2]School of Engineering & Computing, Glasgow Caledonian University, Glasgow, United Kingdom

Introduction: Failure in cable insulation is generally preceded by a degradation phase that may last several years. A significant cause of cable system failures is the breakdown of electrical insulation between the electrodes. The operational stresses that occur in cable insulation which include thermal, mechanical and electrical effects will vary with time and can cause degradation due to the ...

Predicting Critical Current as a Function of Magnetic Field in High-Temperature Superconductors

J. Doody [1], P. Michael [1], R. Vieria [1], W. Beck [1], L. Zhou [1], J. Irby [1],
[1] Massachusetts Institute of Technology - Plasma Science and Fusion Center, Cambridge, MA, USA

REBCO tapes belong to a class of high-temperature superconductors (HTS) that can be superconducting at liquid nitrogen temperatures (77K) as opposed to typical superconductors such as Nb3Sn which need to operate at liquid helium temperatures (4K). One important aspect of designing a super conducting coil is the ability to predict the critical current above which the conductor becomes ...