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 abramgem 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.

Multiple Solutions in the Theory of DC Glow Discharges

P. Almeida, and M. Benilov
Departamento de Física. Universidade da Madeira, Portugal

It was suggested long ago that a theoretical model of a near-cathode region in a DC glow discharge admits multiple steady-state solutions describing different modes of currrent transfer. Even the most simple self-consistent models should admit such multiple solutions. In the present work, these solutions have been calculated for the first time with COMSOL Multiphysics.

Gauss's Law; Teaching Platform Using the Magic Cube: Implementation by COMSOL Multiphysics

H. Ghali, and A. Hossam
Electrical Engineering Department, British University in Egypt, Cairo, Egypt

Most probably Gauss\'s law is considered as the first \"electromagnetic\" concept for early undergraduate physics and electromagnetic courses. In early study year, teaching Gauss’s law is usually performed based on two main components; 1) The use of simple symmetrical charge distributions where a correct expectation of the spatial behavior of the electric flux density is possible and 2) The use ...

Heat-Sink Solution through Artificial Nanodielectrics for LED Lighting Application

N. Badi[1], R. Mekala[2]
[1]Department of Physics, Center for Advanced Materials, University of Houston, Houston, TX, USA
[2]Department of Electrical & Computer Engineering, University of Houston, Houston, TX, USA

Thermally conducting but electrically insulating materials are needed for heat-sink LED lighting applications. We report on a cost effective and innovative method based on creating core-shell nanoparticles in polymer with aluminum (Al) nanoparticles as the high thermal conductivity core and ultrathin aluminum oxide (Al?O?) as a capping shell. The solid oxide shell around the Al core prevents ...

Some Commonly Neglected Issues Which Affect DEP Applications

G. Zhang[1], V. Pandian[1], J. Brcka[2], J. Faguet[2], E. Lee[2]
[1]Clemson University, Clemson, SC, USA
[2]TEL U.S. Holdings, Inc., U.S. Technology Development Center, Austin, TX, USA

Dielectrophoresis (or DEP) has been exploited for various micro and nano fluidics applications like patterning, sorting and separation. However, there are several commonly neglected issues in quantifying DEP forces. Such negligence could potentially lead to wrong DEP force predictions and estimates, posing difficulties in correlating experimental observations with theories. Among the commonly ...

Modeling the ELENA Electron Cooler with COMSOL Multiphysics® Software - new

G. Tranquille[1]
[1]CERN, Geneva, Switzerland

ELENA is a small cooler decelerator ring at CERN which will be built to increase substantially the number of usable antiprotons delivered to experiments for studies with antihydrogen and antiprotonic nuclei. COMSOL Multiphysics® software has been used to completely model the ELENA electron cooling device in 3D. We have taken advantage of the different physics-based modules of COMSOL ...

Coupling Picosecond Terahertz Pulses to a Scanning Tunneling Microscope

P. H. Nguyen [1], C. Rathje [2], G. J. Hornig [1], V. Jelic [1], C. Ropers [2], F. A. Hegmann [1],
[1] University of Alberta, Edmonton, AB, Canada
[2] 4th Physical Institute, University of Göttingen, Göttingen, Germany

Probing ultrafast processes over subpicosecond and picosecond time scales provides fundamental insight into the nature of materials. We have experimentally demonstrated terahertz (THz)-pulse-induced tunneling in a scanning tunneling microscope (THz-STM) to image surfaces with simultaneous nanometer spatial resolution and subpicosecond time resolution [1]. However, the exact mechanism by which ...

Determination of Electric Potential Distribution and Cell Resistance of a Uranium Electrorefining Cell

S.P. Ruhela, S. Agarwal, B. Muralidharan, B.K. Sharma, B.P. Reddy, G. Ravisankar, K. Nagarajan, C.A. Babu, and P. Kalyanasundaram
Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, Tamil Nadu, India

Electrorefining is an electrolytic process for obtaining high purity metal. In this process the impure metal is made anode and the high purity metal is deposited on cathode. Electrorefining is a key step in pyrochemical reprocessing of spent fuel from metal fuel fast reactors. Development of an electrorefining cell, in which processing of 10 kg of simulated spent fuel will be demonstrated, is ...

Design and Analysis of an Electrostatic Precipitator for a Diesel Particulate Filter - new

S. Manoj[1], R. Giri[1], S. Selvakumar[1]
[1]Rajalakshmi Engineering College, Chennai, Tamil Nadu, India

Gaseous exhaust of different industries contains dust particles of different chemical precipitates that are harmful for the environment. Electrostatic Precipitators are very often used in industries like power plant to filter their gaseous exhaust and to prevent the atmosphere to being polluted. Electrostatic Precipitators are very efficient in dust particle collection from the flue gas. ...

Electromagnetic Parameters Extraction for Integrated-Circuit Interconnects for Open Three Conductors with Two Levels Systems

S.M. Musa[1], M.N.O. Sadiku[1], J.D. Oliver[1]
[1]Prairie View A&M University, Prairie View, TX, USA

The accurate estimate of values of electromagnetic parameters are essential to determine the final circuit speeds and functionality for designing of high-performance integrated circuits and integrated circuits packaging. In this paper, a new quasi-TEM capacitance and inductance analysis of multiconductor multilayer interconnects is successfully demonstrated using the finite element method (FEM) ...

Modeling Magnetic Induction from Transient Events Impinging upon a Conducting Moon

H. Fuqua[1], G. Delory[1], I. de Pater[2], R. Grimm[3]
[1]University of California - Berkeley, Space Sciences Lab, Berkeley, CA, USA
[2]University of California - Berkeley, Berkeley, CA, USA
[3]Southwest Research Institute, Boulder, CO, USA

Electromagnetic sounding measurements utilize magnetic induction to constrain the interior geophysical properties of planetary bodies. Under some conditions, the Earth’s moon can be approximated by the response of a conducting sphere in a vacuum. Transient magnetic fields originating from the sun can interact directly with the moon, producing eddy currents that generate an induced magnetic ...