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In questa sezione troverete i lavori presentati alle Conferenze mondiali COMSOL. Le presentazioni descrivono ricerche e prodotti innovativi progettati con COMSOL Multiphysics da colleghi di tutto il mondo. I temi delle ricerche presentate abbracciano un'ampia gamma di settori produttivi e aree applicative, in ambito elettrico, meccanico, fluidodinamico e chimico. Lo strumento di Ricerca Rapida vi permetterà di trovare le presentazioni che si riferiscono all'area di vostro interesse.

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 Inactivation of Bacteria Under Dynamic Heating Conditions in Solid Media

S. Curet[1], M. Mazen Hamoud-Agha[1]
[1]GEPEA, UMR 6144, CNRS, ONIRIS, Université de Nantes, Nantes, France

In this study, COMSOL®4.2a is used to model a microwave heating process in a TE10 rectangular waveguide. The sample consists of a small cylindrical Ca-alginate gel (D = 8 mm, H = 10 mm) inoculated with bacteria Escherichia Coli K12. The sample is placed along the microwave propagation direction into the waveguide. Maxwell’s equations and heat transfer are coupled to a microbial inactivation ...

Detector and Calibration-source Models for the SAFARI Detector Test Facility

M. Audley[1], G. de Lange[1], C. Bracken[2]
[1]SRON Netherlands Institute for Space Research, Groningen, The Netherlands
[2]National University of Ireland, Maynooth, Ireland

SAFARI is a far-infrared imaging spectrometer for the Japanese satellite observatory SPICA. SAFARI covers the wavelength range 34—210 μm (1.4—8.8 THz) using Transition-Edge-Sensor (TES) bolometers. We have built a test facility to qualify and characterize the SAFARI focal plane units using cryogenic optical calibration sources. To support this work we have used COMSOL Multiphysics® to model ...

Micromachined Silicon Integrating Cavities for Far-Infrared Bolometer Arrays - new

M. Audley[1], G. de Lange[1], G. Keizer[1], C. Bracken[2]
[1]SRON Netherlands Institute for Space Research, Groningen, The Netherlands
[2]National University of Ireland, Maynooth, Co. Kildare, Ireland

We are investigating gold-plated micromachined silicon integrating cavities for arrays of far infrared Transition Edge Sensor bolometers. We present the results of our simulations and show how we used COMSOL Multiphysics® software to optimize the geometry of the integrating cavity. We show that we can achieve a high optical efficiency over a wide frequency range.

Design Of Magnetoplasmonic Resonant Nanoantennas For Biosensing Applications

M.E. Mezeme, and C. Brosseau
Université Européenne de Bretagne–Université de Bretagne Occidentale, Brest, France

The study of plasmonic structures continues to be at the forefront of research in nanotechnology and condensed matter physics. Here, we present a numerical model we have created and verified to characterize the frequency dependence of the effective magnetic permeability and permittivity of a core-shell (CS) nanostructure composed of a magnetic core and a plasmonic shell with well-controlled ...

Modeling of Through-the-Snow Electric Field Propagation for Rescue Systems

N. Ayuso[1], V. Bataller[1], A. Muñoz[2], D. Tardioli[1], J. A. Cuchí[1], F. Lera[3], and J. L. Villarroel[1]
[1]Aragón Institute for Engineering Research (I3A), University of Zaragoza, Zaragoza, Spain
[2]Advanced Research Laboratories of I3A, Walqa Technological park, Huesca, Spain
[3]Institute of Material Science of Aragón, CSIC-Universidad de Zaragoza, Zaragoza, Spain

Propagation models for avalanche rescue systems are studied here. The paper focuses on the through-the-snow electric field propagation at ISM frequencies, comparing several models (air model, snow model, three-layered model) and using different solving method (geometrical optics, numerical solution in Matlab and FEM with COMSOL). The simulation results are fitted to experimental data, finding ...

Optimized Illumination Directions of Single-Photon Detectors Integrated with Different Plasmonic Structures

M. Csete[1], Á. Sipos[1], A. Szalai[1], G. Szabó[1]
[1]Department of Optics and Quantum Electronics, University of Szeged, Szeged, Hungary

The optimal orientations of different single-photon detector designs were determined by COMSOL software package. Absorption of niobium-nitride (NbN) stripes in two different (p=220 nm, 3p=660 nm) periodic patterns integrated with plasmonic elements was studied. In OC-SNSPDs consisting of ~quarter-photon-wavelength nano-cavity the optimum direction is perpendicular incidence onto NbN stripes in ...

Multiphysics Analysis of Normal Conducting RF Cavities for High Intensity Proton Accelerators

M. Hassan[1], I. Gonin[1], T. Khabiboulline[1], V. Yakovlev[1]
[1]Fermi National Accelerator Laboratory, Batavia, IL, USA

Normal conducting cavities are typically used in the front end of proton accelerators to get the beam accelerated to velocities approximately a few tenths of the speed of light, where superconducting cavities can then be used to accelerate the beam to the speed of light. The warm part of a typical proton accelerator would contain a radio frequency quadrupole (RFQ) and several buncher cavities. ...

Resonances in Tapered Double-Port TEM Waveguides

J. Kaerst
HAWK, Fachhochschule Hildesheim/Holzminden/Göttingen, Germany

In this paper resonances in tapered double-port TEM waveguides are used as benchmark for simulations. FEM simulations with COMSOL Multiphysics® and simulations using generalised telegraphist's equations with MATLAB® are compared to ananalytical method capable of calculating the resonances of higher order modes. It is valid for tapered double-port TEM waveguides with constant ...

Optimization of Mechanical Properties of Superconducting Cavities for Project X LINAC

I. Gonin[1], M. Awida[1], T. Khabiboulline[1], V. Yakovlev[1]
[1]Fermilab, Batavia, IL, USA

Project X is a proposed proton accelerator complex at Fermilab. The CW LINAC is based on five types of resonators operating at three frequencies: half-wave, spoke, and elliptical. The low beam current for the CW operation of Project X requires cavities to operate at a high loaded Q and, thus, narrow bandwidth. Therefore, it requires optimal mechanical design of the cavities to minimize the ...