نتایج جستجو برای: electromagnetic absorption

تعداد نتایج: 205503  

Journal: :Computer Physics Communications 2006
Fanya Jin Honghui Tong Zhongbing Shi Deli Tang Paul K. Chu

A simple method is proposed to describe the propagation of electromagnetic waves in magnetized uniform plasma slabs. Using this method, the reflection, absorption and transmission coefficients of such plasmas for right-hand circularly waves are studied and the effects of the continuously changing external magnetic field on the power of the electromagnetic waves propagated in magnetized plasma s...

2009
S. H. Lim E. T. Yu

Experimental characterization and finite-element numerical simulations of the electromagnetic interaction between random or periodic Au nanodot arrays patterned atop a silicon-on-insulator SOI photodetector and incident electromagnetic plane waves have been performed at wavelengths of 400–1100 nm. The presence of the Au nanodots is found to lead to increased electromagnetic field amplitude with...

Journal: :Physical review letters 2014
O Lozan M Perrin B Ea-Kim J M Rampnoux S Dilhaire P Lalanne

In this Letter, we study the heat dissipated at metal surfaces by the electromagnetic field scattered by isolated subwavelength apertures in metal screens. In contrast to the common belief that the intensity of waves created by local sources should decrease with the distance from the sources, we reveal that the dissipated heat at the surface remains constant over a broad spatial interval. This ...

2017
Hanwei Wang Qiufang Yao Chao Wang Zhongqing Ma Qingfeng Sun Bitao Fan Chunde Jin Yipeng Chen

In this study, nanooctahedra MnFe₂O₄ were successfully deposited on a wood surface via a low hydrothermal treatment by hydrogen bonding interactions. As-prepared MnFe₂O₄/wood composite (MW) had superior performance of soft magnetism, fire resistance and electromagnetic wave absorption. Among them, small hysteresis loops and low coercivity (<±5 Oe) were observed in the magnetization-field curve ...

2011
Maria Christopoulou Orestis Kazasidis Konstantina S. Nikita

The paper presents the numerical evaluation of the electroencephalogram (EEG) electrode artifacts that are caused during exposure to electromagnetic fields (EMF), in volunteers study. The scope of the study is to differentially present the electromagnetic (EM) power absorption and local Specific Absorption Rate (SAR) distribution, with and without the electrodes. Versions of two basic exposure ...

2010
MIMOZA IBRANI LUAN AHMA ENVER HAMITI Mimoza Ibrani Luan Ahma Enver Hamiti

Exposure to radio frequency electromagnetic fields has raised scientific and public concern regarding possible adverse effects to people exposed to such radiation. At cellular mobile communication frequencies, the most important parameter used to assess human exposure to electromagnetic fields is SAR (Specific Absorption Rate). This paper will firstly address two exposure scenarios related to a...

Journal: :Journal of colloid and interface science 2006
Christian Holtze R Sivaramakrishnan Markus Antonietti J Tsuwi Friedrich Kremer Klaus D Kramer

The microwave absorption at frequencies between 10 MHz and 4 GHz is measured for aqueous brine droplets dispersed in a dielectric medium (epsilon(')=2.0). By varying the size of the droplets, ion type and ion concentration, it is found that the microwave absorption goes through a maximum which depends on the type of ions and their concentration. The absorption process is attributed to the polar...

2001
D. L. Tang A. P. Sun X. M. Qiu Paul K. Chu

The absorption, reflection, and transmission of electromagnetic waves by a nonuniform plasma slab immersed in an ambient uniform magnetic field of various strengths are studied in this paper. The effects of the plasma parameters and magnetic field strength on the absorbed, reflected, and transmitted power are discussed. The magnetized nonuniform plasma slab is modeled by a series of magnetized ...

Journal: :Journal of the American Chemical Society 2013
Matthew D Sonntag Dhabih Chulhai Tamar Seideman Lasse Jensen Richard P Van Duyne

An explanation of the relative intensity fluctuations observed in single-molecule Raman experiments is described utilizing both single-molecule tip-enhanced Raman spectroscopy and time-dependent density functional theory calculations. No correlation is observed in mode to mode intensity fluctuations indicating that the changes in mode intensities are completely independent. Theoretical calculat...

2003
A. V. Kats Y. V. Bludov

The paper deals with the theoretical investigation of plane, normally incident electromagnetic wave transmission through the flat metal film whose dielectric constant has small periodical sinusoidal modulation in one dimension parallel to the projection of the electric field onto the film surface. The dependencies of the film transmittancy on the parameters of the problem (frequency, modulation...

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