نتایج جستجو برای: electromagnetic waves

تعداد نتایج: 181493  

2008
M. Brun S. Guenneau

We derive the elastic properties of a cylindrical cloak for in-plane coupled shear and pressure waves. The cloak is characterized by a rank 4 elasticity tensor with 16 spatially varying entries which are deduced from a geometric transform. Remarkably, the Navier equations retain their form under this transform, which is generally untrue [Milton et al., New J. Phys. 8, 248 (2006)]. We numericall...

2016
Hiroki Wakatsuchi Fei Gao Satoshi Yagitani Daniel F. Sievenpiper

Conventional materials vary their electromagnetic properties in response to the frequency of an incoming wave, but these responses generally remain unchanged at the same frequency unless nonlinearity is involved. Waveform-selective metasurfaces, recently developed by integrating several circuit elements with planar subwavelength periodic structures, allowed us to distinguish different waves eve...

2017

Submit Manuscript | http://medcraveonline.com Abbreviations: EMFs: Electromagnetic Fields; MWR: Microwave Radiation; NIR: Non-Ionizing Radiation; RF-EMW: Radiofrequency Electromagnetic Waves; RF: Radiofrequency; EMW: Electromagnetic Wave; SNS: Sympathetic Nervous System; PNS: Parasympathetic Nervous System; PRA: Plasma Renin Activity; AMI: Acute Myocardial Infarction; SNAP: N-AcetylSnitrosoDl-P...

Background: Infertility is defined as inability to conceive after a year of sexual intercourses without the use of contraceptives. In half of the cases the causative factor is the male. Males are exposed to the effect of various environmental factors, which may decrease their reproductive capabilities. Phone electromagnetic power is very small, only a few hundredths of a microwave oven, but bec...

1998
N. L. SHATASHVILI

The hot electron-positron unmagnetized plasma with small fraction of cold electron-ion plasma is investigated. The modulational interactions of the electromagnetic waves and the electron-sound waves are studied. The possibility of soliton formation is investigated.

2001
E Comay

The significance of the Lorentz gauge as a constraint on solutions of Maxwellian waves is discussed. It is proved that recent claims of superlu-minal propagation of electromagnetic waves rely on an erroneous basis.

1998
Jeremy S. Heyl Lars Hernquist

The nonlinear properties of electromagnetic waves traveling through a magnetized vacuum is of particular interest in the study of neutron stars. Heisenberg and Euler [1] and Weisskopf [2] first derived nonlinear corrections to the Maxwell equations of the electromagnetic field. Lutzky and Toll [3] and Zheleznyakov and Fabrikant [4] applied the weak-field expansion to show that shock waves can d...

2008
Allan Greenleaf Yaroslav Kurylev Matti Lassas Gunther Uhlmann

Cloaking devices are prescriptions of electrostatic, optical or electromagnetic parameter fields (conductivity σ(x), index of refraction n(x), or electric permittivity ǫ(x) and magnetic permeability μ(x)) which are piecewise smooth on R3 and singular on a hypersurface Σ, and such that objects in the region enclosed by Σ are not detectable to external observation by waves. Here, we give related ...

2011
Tetsuya Tominaga

Telecommunication functions of electronic devices have been and will continue to increase. The so called smart community, a society in which more advanced communications technology is used, will enable life to be increasingly convenient. Thus, telecommunications will become more and more important. However, when such functions become unavailable for some reason, it will negatively impact societ...

2011
Sukhmander Singh Hitendra K. Malik

The electrostatic and electromagnetic low frequency waves propagating in azimuthal direction in a Hall thruster channel are found to be unstable due to the resistive coupling to the electrons’ closed drift in the presence of collisions. The thermal motion of the electrons and their collisions significantly affect the growth of these waves. With respect to the collision frequency, wave number, e...

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