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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 ...

Pulsed Power Accelerator Design with COMSOL Multiphysics® Software - new

D. Reisman[1]
[1]Sandia National Laboratories, Albuquerque, NM, USA

We have developed Thor: a pulsed power accelerator for performing dynamic material experiments. The design was aided by using the COMSOL Multiphysics® software with the AC/DC Module and RF Module. Our design process involved optimizing the impedance of the system while maintaining a good margin against electrical breakdown. By using a three-dimensional electromagnetic model of the entire power ...

Genetic Algorithm for Geometry Optimization of Optical Antennas

R. Diaz de Leon [1], G. Gonzalez [1], A. G. Rodriguez [1], E. Flores [2], F. J. Gonzalez [1],
[1] Universidad Autonoma de SLP, San Luis Potosi, S.L.P., Mexico
[2] Instituto Tecnologico de SLP, San Luis Potosi, S.L.P., Mexico

A genetic algorithm was programmed in MATLAB® software and linked to the COMSOL Multiphysics® software with the COMSOL LiveLink™ for MATLAB® to optimize the geometry of an optical antenna (nanoantenna). The proposed computational model demonstrated that nanoantenna geometries does not feature a conventional macroscopical antenna geometry, such as those utilized for the radiofrequency range. In ...

Modeling Directional Two Arm Archimedes Spiral Coils in the RF Electromagnet Range

A. Kalinowski, and J. Maguire
Naval Undersea Warfare Center/Div. Npt. , Newport, RI, USA

The paper addresses a class of problems for modeling and consequently simulating the electromagnetic field radiation pattern from a two arm Archimedes spiral coil. The performance of particular interest is knowledge of the radiated magnetic field H and electric field E in the neighborhood of the coil. The results in this paper illustrate how COMSOL is used to solve for the radiated ...

Modelling Electric Fields in High Voltage Submersible Changeover Switch

K. Follesø
Bennex AS, Bergen, Norway

Controlling electric field distribution in high voltage components is critical to avoid excessive electric stress on the insulation and thus reducing the risk of insulation breakdown and damage to equipment. For subsea applications this is even more important due to the costs involved in accessing and replacing the damaged parts. This paper describes how COMSOL Multiphysics has been used for ...

Finite Element Modeling of Remote Field Eddy Current Phenomenon

T. Jayakumar[1], B. Purnachandra Rao[2], C. K. Mukhopadhyay[3], B. Sasi[2], V. Arjun[5], S. Thirunavukkarasu[2]
[1]Metallurgy and Materials Group, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, TN, India
[2]Nondestructive Evaluation Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, TN, India
[3]EMSI Section, Nondestructive Evaluation Division, Indira Gandhi Centre for Atomic Research, Kalpakkam, TN, India
[5]NDE Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603 102, TN, India

Remote field eddy current (RFEC) technique is a method of detecting defects in ferromagnetic tubes. This is based on low frequency eddy current, which employs an exciter coil and a receiver coil separated by a characteristic distance. The exciter is fed with a low frequency sinusoidal current and the receiver coil senses the perturbation of the magnetic fields caused by the eddy currents in the ...

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 ...

Current Distribution and Magnetic Fields in Complex Structures Using Comsol Multiphysics

S. F. Madsen, and C. Falkenstrøm Mieritz
Highvoltage.dk ApS
Lejre, Denmark

The present paper presents numerical calculations of the magnetic fields and the current distribution within a wind turbine nacelle. The results are used by control system engineers designing panels and cables, who must ensure that the immunity of the equipment complies with the environment within the turbine. Since the release of the International standard concerning lightning protection of ...

Passive Microsensor Based on LC Resonators for Substance Identification

D.A. Sanz Becerra[1], E.A. Unigarro Calpa[1], J. Osma[1], F. Segura[1]
[1]Universidad de los Andes, Bogotá, Colombia

A scheme for inductive wireless powering and readout of passive LC sensor is presented. The sensor’s inductor is designed as a planar square coil and is used as the power receiving component. The capacitor is connected directly to the inductor and it was designed as an interdigital capacitor. With a transmitting coil (coupling antenna), an electromagnetic field is generated which couples with ...

Simple Finite Element Model of the Topografiner - new

H. Cabrera[1], D. A. Zanin[1], L. G. De Pietro[1], A. Vindigni[1], U. Ramsperger[1], D. Pescia[1]
[1]Laboratory for Solid State Physics, ETH Zürich, Zürich, Switzerland

In our recent experiments we are revisiting the topografiner technology for the imaging of surface topography with a resolution of a few nanometers. In these new technique called Near-Field Emission Scanning Electron Microscopy (NFESEM), low-energy electrons are emitted from a polycrystalline tungsten tip via electric-field assisted tunneling. In order to characterize and improve the ...