E. Hollander, E. O. Kamenetskii, R. Shavit
Microwave Magnetic Laboratory, Department of Electrical and Computer Engineering, Ben Gurion University of the Negev, Beer Sheva, Israel
Microwave sensing and monitoring is very attractive for biological applications because of their sensitivity to water and dielectric contrast. Direct detection of biological structures in microwave frequencies and understanding of the molecular mechanisms of microwave effects is considered as a problem of a great importance. Nowadays, however, microwave technique for localized testing biological ...
Improving Heating Uniformity of Dried Fruit in RF Treatments for Pest Control: Model Development and Validation - new
B. Alfaifi, J. Tang, Y. Jiao, S. Wang, B. Rasco, S. Jiao, S. Sablani
King Saud University, Riyadh, Saudi Arabia
Washington State University, Pullman, WA, USA
Northwest A&F University, Yangling, Shaanxi, China
Non-uniform heating is one of the most important challenges during the development of radio frequency (RF) heat treatments for pest control. A computer simulation model using finite element–based COMSOL Multiphysics® software was developed to investigate the heating uniformity of raisins packed in a rectangular plastic container and treated using RF heating. The developed model was then ...
An Assessment of the Suitability of the Body and Adult Head Coils for Transmission during Paediatric Magnetic Resonance Imaging
G.R. Cook, M.J. Graves, F.J. Robb, D.J. Lomas
Department of Radiology, University of Cambridge, Cambridge, United Kingdom
General Electric Healthcare Coils, Aurora, Ohio, USA
MRI offers many advantages over other modalities and its lack of ionizing radiation is important for children, but can be limited by the radio-frequency (RF) coils available. This work calculates Specific Absorption Rate (SAR) and homogeneity of the RF transmit field (B1+) when imaging infants in adult coils. Two birdcage-type coils were loaded by a tissue model and their B1+ homogeneities ...
W. H. Lee, K. Jensen
Massachusetts Institute of Technology, Cambridge, MA, USA
We will present the issues of a microreactor setup designed for microwave organic synthesis and demonstrate how COMSOL Multiphysics® is used to understand the mechanism of microwave heating and improve the microreactor design. The RF Module was used for the electromagnetics and solid heat transfer simulations of a CEM Discover microwave unit, while the Heat Transfer and CFD Modules were used the ...
Siram Sai Krishna, Nuti Venkata Subrahmanya Ayyappa Sai, Dr.K.Srinivasa Rao
Lakireddy Bali Reddy College of Engineering, Mylavaram, Andhra Pradesh, India
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 ...
Theoretical Study of Phase and Amplitude Characteristics of Microwave Coplanar Delay Line Containing Thin Ferroelectric Layer
V. Nikolaevtsev, S. Yankin, S. Suchkov, D. Suchkov, A. Litvinenko
Saratov State University, Saratov, Russian Federation
Joint International Laboratory LICS/LEMAC, IEMN UMR CNRS 8520, EC Lille, France
We theoretically studied the microwave coplanar line of different geometry based on MgO substrate with a thin (30 nm) ferroelectric layer under the external electric field using the environment of 3D modeling in COMSOL Multiphysics®, RF Module, Frequency Domain. Frequency dependence of delay line coefficient S21 was obtained. Sizes of the microstrip and the gap between the strip and the ground ...
M. Surita, M. Patel, and S. Marwaha
 Department of Electrical & Instrumentation Engineering, SLIET , Longowal (Deemed University), Punjab
 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 cancer ...
M. Audley, G. de Lange, G. Keizer, C. Bracken
SRON Netherlands Institute for Space Research, Groningen, The Netherlands
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.
J. T. Andrews, S. Chaurasiya, O. P. Chaudhary, D. Agarwal
National MEMS Design, Department of Applied Physics, Shri G S Institute of Technology & Science, Indore Madhya Pradesh, India
By introducing a periodic modulation in a waveguide, it is possible to create an interaction between forward-traveling and backward-traveling modes of an optical waveguide. Bragg grating may be a one dimensional diffraction grating which diffracts light from the forward-traveling mode into the backward traveling mode. Since the Bragg grating reflects at the wavelength for which it is ...
A finite–element simulation study of the complex effective permittivity of two-phase random composite materials
Laboratoire d'Electronique et Systèmes de Télécommunications, Université de Bretagne Occidentale, Brest, France
In the current work we introduce a finite-element method (FEM) for calculating the effective permittivity of macroscopically inhomogeneous media. Specifically, we consider two-dimensional (2d) two-phase heterostructures consisting of hard circular disk equilibrated distributions. The hard-disk distribution has been chosen as the reference system since it is one of the simplest idealized models ...