Ici vous trouverez les présentations issues des Conférences COMSOL à travers le monde. Réalisées par des utilisateurs de COMSOL Multiphysics, ces présentations explorent tous les domaines actuels d'innovation. Les applications couvrent pratiquement tous les secteurs industriels et impliquent des phénomènes électriques, mécaniques, fluidiques et chimiques. Utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

Electromagnetic Modeling of Induction Tool Responses in Layered Earth Formations

N. Shakya [1], L. Sun [1],
[1] Youngstown State University, Youngstown, OH, USA

Introduction: This study presents the 3D electromagnetic model in layered media using induction logging tool. This algorithm utilizes electromagnetic wave frequency domain (EWFD) interface of Maxwell equations. Electromagnetic methods are popular tools for the measurement of resistivity (or conductivity) of the Earth formation. The purpose of our study is to show the effect of conductivity and ...

Hyperbolic Heat Transfer Equation for Radiofrequency Heating: Comparison between Analytical and COMSOL Solutions

V. Romero-García[1], M. Trujillo[2], M.J. Rivera[2], J.A. López Molina[2], and E.J. Berjano[3]
[1]Centro de Tecnologías Físicas Acústica, Universidad Politécnica de Valencia, Valencia, Spain
[2]Dpto. Matemática Aplicada, Instituto Universitario de Matemática Pura y Aplicada, Universidad Politécnica de Valencia, Valencia, Spain
[3]Institute for Research and Innovation on Bioengineering, Universidad Politécnica de Valencia, Valencia, Spain

The Radiofrequency Heating (RFH) is widely employed to heat biological tissue in different surgical procedures. Most models analyze the RFH employing a Parabolic Heat Transfer Equation (PHTE) based on Fourier's theory. The PHTE can be used for problems involving long heating times or low thermal gradients. However, when the problem involves short heating times or extreme thermal gradients it is ...

Numerical Optimization Technique for the Optimal Design of the Surface Plasmon Grating Coupler

C. Caiseda[1], V. Aksyuk[2], I. Griva[3]
[1]Inter American University of Puerto Rico, Bayamon, PR, USA
[2]National Institute of Standards and Technology, Gaithersburg, MD, USA
[3]George Mason University, Fairfax, VA, USA

The optimal design of the grating coupler for surface plasmon generation is revisited for its interdisciplinary importance in the efficient use of energy, and the strong dependence of the energy convergence rate of the system on the design. This work contributes a comprehensive gradient based numerical optimization technique to optimize both geometry of the grating and parameters of the ...

Scattering of mm-Waves by Turbulent Structures in Magnetically Confined Fusion Plasmas

O. Chellaï [1], S. Alberti [1], I. Furno [1], T. Goodman [1], M. Baquero [1]
[1] Centre de Recherches en Physique des Plasmas, Ecole Polytechnique Fédérale de Lausanne, Suisse

In magnetically confined fusion devices, electron cyclotron resonance heating (80-170 GHz) is characterized by a local RF-power deposition at the electron cyclotron resonance [1]. A mm-wave RF Gaussian beam is launched from a dedicated antenna and propagates through the highly turbulent scrape-off layer (SOL) at the edge of the confined plasma. Turbulence in the SOL is characterized by ...

Microwave Coagulation Therapy Using Microwave Antenna

M. Surita[1], M. Patel[2], and S. Marwaha[1]
[1] Department of Electrical & Instrumentation Engineering, SLIET , Longowal (Deemed University), Punjab
[2] ABES Engineering College, Department of Electronics and Communication Engineering, Ghaziabad

The purpose of this paper is to illustrate the microwave coagulation therapy (MCT) that can be used mainly for the treatment of hepatocellular carcinoma. In this treatment invasive technique are used in which thin microwave coaxial antenna is inserted into the tumor and the microwave energy heats up the tumor to produce the coagulated region including the cancer cells. We have to heat the ...

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 ...

Analysis of Microwave Radiation for Heating

J. Crompton, S. Yushanov, L. Gritter, and K. Koppenhoefer
AltaSim Technologies, LLC.
Columbus, OH

Microwave heating is an important process for many commercial, industrial and household applications. In microwave heating applications, the energy is introduced directly into the volume of the material. As a consequence the quality of the process is highly dependent on the uniformity of the electromagnetic field distribution. Thus, developing a uniform electromagnetic field inside the ...

Design and Simulation of MEMS-based Piezoelectric Accelerometer

Siram Sai Krishna[1], Nuti Venkata Subrahmanya Ayyappa Sai[1], Dr.K.Srinivasa Rao[2]
[1]Lakireddy Bali Reddy College of Engineering, Mylavaram, Andhra Pradesh, India
[2]Professor & HOD, Dept. of Electronics and Instrumentation Engineering, Lakireddy Bali Reddy College of Engineering, Mylavaram, Andhra Pradesh, India

The Micro electro mechanical systems (MEMS) technology provides us a platform to interface between mechanical and electrical components. In this paper, we have designed MEMS accelerometer based on piezoelectric property, and simulated using COMSOL Multiphysics®. The design, which has PZT kept in the annular diaphragm, provides good sensitivity. When this accelerometer is subjected to stress ...

Biological Effects and Therapeutic Applications of Electromagnetic Radiations

A. Singh[1], S. Maini[1], and M. Anupma[1]
[1] Department of Electrical & Instrumentation Engineering, Sant Longowal Institute of Engineering and Technology , Longowal (Deemed University), Punjab, India

The electromagnetic fields have a great influence on the behavior of all the living systems. The human body itself is a source of naturally generated electric and magnetic fields. When external signals of comparable strength flows through the human body; the nature of changes that such signals could induce in natural electrochemical processes and voltage is a subject of interest and of ...