科技论文和展示

这里您可以找到在全球 COMSOL 年会上所有用户报告的演示文稿。这些演示文稿介绍 COMSOL 用户是如何使用 COMSOL Multiphysics 进行创新性研究和产品设计。研究主题涵盖了包括电气、机械、流体和化工等范围广泛的行业和应用领域。请使用“快速搜索”来查找与您的研究领域相关的演示文稿。

Assessment of the SNR, G-Factor and Relative B1- Fields of Medical Radiofrequency Arrays - new

G. Cook[1], F. Robb[2], M. Graves[1], D. Lomas[1]
[1]Department of Radiology, University of Cambridge, Addenbrooke's Hospital, Cambridge, UK
[2]GE Healthcare Coils, Aurora, OH, USA

MRI relies upon a static magnetic field which creates a net magnetic moment from proton spins and radio-frequency fields are generated to excite this magnetic moment into a perpendicular plane, where it can be detected through the use of an array of conductive loops. The optimal size,shape and layout of these elements has been widely discussed in literature since the phased array's conception ...

Analysis of a Planar Inverted-F Mobile Handset Antenna with Reduced Radiation Towards the Human Head - new

C. Anandan[1]
[1]Cochin University of Science and Technology, Cochin, Kerala, India

This paper deals with the simulation and analysis of SAR and temperature distribution induced by a Planar Inverted-F Antenna on human head model using COMSOL Multiphysics® software. The goal of this paper is to compare the SAR and temperature distributions of omni-directional PIFA with that of a PIFA with reduced radiation towards human head. The two antennas are designed to operate at 900 MHz ...

S-parameter Sensitivity Analysis of Waveguide Structures with FEMLAB

Li, D., Nikolova, N.K.
Computational Electromagnetics Research Laboratory, Department of Electrical and Computer Engineering, McMaster University, Hamilton, Ontario

For the purpose of accurate and efficient design of a microwave structure, sophisticated optimization techniques are typically used. The optimization process can greatly benefit from the availability not only of the objective function, but also its gradient. Numerical electromagnetic solvers do not provide the gradient information, thus defaulting to the finite-difference approximation at the ...

Finite Element Analysis of Curved Cone Corrugated Ground Plane Conical Antenna

R. Sharma, and A. Marwaha
SLIET, Longowal, Sangrur
Punjab, India

Curved cone corrugated ground plane conical antenna has been designed and analyzed using Finite Element Method. In this paper, we introduce a novel Curved cone corrugated ground plane conical antenna for ultra-wideband (UWB) applications. The antenna is composed of curved cone with narrow corrugation on finite ground plane and fed by a 50? coaxial cable. The designed antenna operates over ...

Transient RF Heating of a Conductive Implant: Coupled Electromagnetic/Thermal Simulation and Experimental Validation

A. Leewood[1], D. Gross[1], J. Crompton[2], S. Yushanov[2], O. Simonetti[3], Y. Ding[3]
[1] MED Institute Inc., West Lafayette, IN, USA
[2] AltaSim Technologies, Columbus, OH, USA
[3] Ohio State University, Columbus, OH, USA

The purpose of this work was to establish a reliable radio frequency (RF) heating simulation which directly provides transient temperatures for medical devices with high geometric fidelity. These temporal results of localized temperatures can be used to determine conditions for safety of medical devices in the magnetic resonance (MR) environment. Information from this work will directly benefit ...

Microwave Exposure System for In Vitro and In Vivo Studies - new

C. Nadovich[1, 2], W. D. Jemison[2], J. A. Stoute[3], C. Spadafora[4]
[1]Lafayette College, Easton, PA, USA
[2]Clarkson University, Potsdam, NY, USA
[3]Pennsylvania State University, Hershey, PA, USA
[4]INDICASAT AIP, Ciudad del Saber, Panama

A computer controlled microwave exposure system and specialized applicators were constructed for the purpose of facilitating accurate observations of microwave radiation effects on uninfected and infected biological tissue in vitro and in vivo under different electromagnetic modalities and exposure configuration. To address diverse requirements, three different applicators were developed: a ...

Microwave Applicators With Conveyor Belt System

A. Methlouthi, O. Rouaud, and L. Boillereaux
GEPEA-ONIRIS, France

Industrial microwave ovens are widely used in agri-food and chemical applications. Resonant cavities are used to speed up chemical reactions and have the advantage to be small sized and efficient in terms of microwave distribution. These multimode cavities are considered as batch ovens where a small amount of products is treated. Rotating plates are added in the cavities to ensure a homogeneous ...

Analysis of Super Imaging Properties of Spherical Geodesic Waveguide Using COMSOL Multiphysics

D. Grabovi?ki?[1], J.C. González[1], P. Benítez[1], J.C. Miñano[1]
[1]Cedint Universidad Politécnica de Madrid, Madrid, Spain

Negative Refractive Lens (NRL) has shown that an optical system can produce images with details below the classic Abbe diffraction limit. This optical system transmits the electromagnetic fields, emitted by an object plane, towards an image plane producing the same field distribution in both planes. Recently, two devices with positive refraction, the Maxwell Fish Eye lens (MFE) (Leonhardt et al. ...

Complex K-Bands Calculation for Plasmonic Crystal Slabs by Means of Weak Formulation of Helmholtz's Eigenvalue Equation

G. Parisi[1], P. Zilio[1], F. Romanato[1]
[1]University of Padova, Padova, Italy

We present a Finite Element Method (FEM) to calculate the complex valued k(?) dispersion curves of a photonic crystal slab in presence of both dispersive and lossy materials. In particular the method can be exploited to study plasmonic crystal slabs. We adopt Perfectly Matched Layers (PMLs) in order to truncate the open boundaries of the model, including their related anisotropic permittivity and ...

Topographic Effects on Radio Magnetotelluric Simulations on Levees: Numerical Modeling for Future Comparison With Fields Results

R. Duval[1], C. Fauchard[1], R. Antoine[1]
[1]ERA23-IFSTTAR, Laboratoire des Ponts et Chaussées de Rouen, CETE-Normandie Centre, France

We study the topography influence of levees on the electric resistivity signal obtained with the Radio-Magnetotelluric method. Field measurements have been modeled with COMSOL, using the AC/DC and RF Modules. A levee situated in Orléans along the Loire river (France) has been considered in order to design a model tacking account of the skin depth and the incident wavelength, keeping a constant ...

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