نتایج جستجو برای: electromagnetic waves

تعداد نتایج: 181493  

2011
TANJA BODE

Modeling the late inspiral and merger of supermassive black holes is central to understanding accretion processes and the conditions under which electromagnetic emission accompanies gravitational waves. We use fully general relativistic, hydrodynamics simulations to investigate how electromagnetic signatures correlate with black hole spins, mass ratios, and the gaseous environment in this final...

2005
Yu. P. Bliokh

It is shown that a smooth metal film (or a plasma layer) can be made transparent for an electromagnetic wave when two identical subwavelength diffraction gratings are placed on both sides of the film. The electromagnetic wave transmission through the metal film is caused by excitation of evanescent surface waves (plasmons) and their transformation into propagating waves at the gratings. A model...

Journal: :Optics express 2008
Arthur R Davoyan Ilya V Shadrivov Andrey A Sukhorukov Yuri S Kivshar

We analyze the Bloch oscillations of electromagnetic waves in chirped layered structures with alternating layers of negative-index metamaterial and conventional dielectric under the condition of the zero average refractive index. We consider the case when the chirp is introduced by varying the thickness of the layers linearly across the structure. We demonstrate that such structures can support...

2008
Y. G. Shckorbatov V. N. Pasiuga V. A. Grabina N. N. Kolchigin D. O. Batrakov V. V. Kalashnikov D. D. Ivanchenko V.N.Bykov

Isolated human buccal epithelium cells were irradiated by microwaves of frequency f=35 GHz and surface power density E=30 μW/cm. The state of chromatin in human cells was determined by methods of light and electron microscopy. The state of cell membranes was evaluated by the method of vital indigo carmine staining. The microwave-induced condensation of chromatin in human cells was revealed. Lef...

2003
A. E. SHABAD

It is pointed, that for the asymptotically strong superSchwinger magnetic field B, exceeding the critical value of Bcr = (mc/eh) = 4.4 · 10 Gauss, the vacuum polarization effects become important not only in the γ-range, but also for softer electromagnetic quanta, including X-rays, optic photons and for electromagnetic waves of radio frequencies. This is a consequence of the linearly growing te...

2016
Haifeng Wang Jian Lin Dawei Zhang Yang Wang Min Gu H. P. Urbach Fuxi Gan Songlin Zhuang

We present a concealing method in which an anti-point spread function (APSF) is generated using binary optics, which produces a large-scale dark area in the focal region that can hide any object located within it. This result is achieved by generating two identical PSFs of opposite signs, one consisting of positive electromagnetic waves from the zero-phase region of the binary optical element a...

Journal: :the modares journal of electrical engineering 2011
ahmadreza amin alireza salehi mohammd hossin ghezelayagh yaghob ghanegharabagh

voltages and currents are induced into electronic circuit boards as electromagnetic waves are radiated on them. the strength of induction depends on the wavefront and the circuit board characteristics. in this paper, by solving maxwell’s equations using fdtd method and then by extending it by three dimensional simulation using the gpml criteria for boundary conditions and tf/sf technique, effec...

2017
Frank H. Makinson

The process that produces electromagnetic wave harmonics and heterodynes are assumed to be well understood. The textbook definitions of these terms are being tagged herein as cargo cult science because they are incomplete. The effects these term describe occur when electromagnetic waves, singularly or in combination, interact within a non-linear medium. The textbook descriptions of these terms ...

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...

Journal: :iranian journal of medical physics 0
seyed mohammad firoozabadi associated professor, medical physics dept., tarbiat modares university, tehran, iran. majid jadidi assistant professor, medical physics dept., semnan university of medical sciences, semnan, iran. ali rashidy-pour professor, physiology research center, semnan university of medical sciences, semnan, iran. bahram bolouri associated professor, medical physics dept., iran university of medical sciences, tehran, iran. yaghoob fathollahi professor, physiology dept., tarbiat modares university, tehran, iran. gholamreza mohammadi assistant professor, semnan university of medical sciences, semnan, iran.

introduction: over the last decade, exposure to electromagnetic waves due to base station antennas has increased. this study was planned to evaluate the effects of different electrical field strengths with 950 mhz waves of the gsm mobile phone system on the excitatory postsynaptic potentiation (epsp) slope of the dentate gyrus long-term potentiation (ltp). material and methods: twenty four naiv...

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