scholarly journals Electromagnetic response of gravitational waves passing through an alternating magnetic field: A scheme to probe high-frequency gravitational waves

2018 ◽  
Vol 98 (6) ◽  
Author(s):  
H. Zheng ◽  
L. F. Wei ◽  
H. Wen ◽  
F. Y. Li
Keyword(s):  
Magnetic Field ◽  
Gravitational Waves ◽  
High Frequency ◽  
Alternating Magnetic Field ◽  
Electromagnetic Response

Alternating Magnetic Field Crystallization of Amorphous Si Films

2004 ◽  
Vol 449-452 ◽  
pp. 513-516
Author(s):  
Ku Hyun Kang ◽  
Sung J. Lee ◽  
Seung Eui Nam ◽  
Hyoung June Kim
Keyword(s):  
Magnetic Field ◽  
Annealing Time ◽  
High Frequency ◽  
Uv Spectroscopy ◽  
Alternating Magnetic Field ◽  
Process Time ◽  
Degree Of Crystallization ◽  
Amorphous Si ◽  
Si Films ◽  
Kinetics Of

We propose a new method for lower process temperature and shorter process time of SPC. This method involves the induction of high frequency alternating magnetic field during crystallization annealing, referring this process as Alternating Magnetic Field Crystallization, AMFC. The processed films were characterized using UV spectroscopy to determine the incubation time, Raman spectroscopy for the degree of crystallization. We found that the kinetics of crystallization was greatly enhanced by alternating magnetic field. When we crystallized, in the case of SPC, annealing time is over 14 hours at 570°C. But in the case of AMFC, annealing time is only 20minutes at the same temperature.

scholarly journals Electromagnetic response to high-frequency gravitational waves having additional polarization states: distinguishing and probing tensor-mode, vector-mode and scalar-mode gravitons

2020 ◽  
Vol 80 (9) ◽  
Author(s):  
Fang-Yu Li ◽  
Hao Wen ◽  
Zhen-Yun Fang ◽  
Di Li ◽  
Tong-Jie Zhang
Keyword(s):  
Gravitational Waves ◽  
Frequency Band ◽  
High Frequency ◽  
Three Dimensional ◽  
High Energy ◽  
Analytic Solutions ◽  
Electromagnetic Response ◽  
Detection Frequency ◽  
Signal Photon ◽  
Polarization States

AbstractGravitational waves (GWs) from extra dimensions, very early universe, and some high-energy astrophysical processes might have at most six polarization states: tensor- and nontensor-mode gravitons. The peak regions or partial peak regions (of the amplitudes or energy densities) of some of such GWs are just distributed in the GHz or higher frequency band, which would be an optimal frequency band for the electromagnetic (EM) response to such high-frequency GWs (HFGWs). In this paper we investigate the EM response to the HFGWs, and for the first time we obtain the concrete form of analytic solutions of the perturbative EM fields caused by all six possible polarizations of the HFGWs in the background stable EM fields and in the proposed three dimensional synchro-resonance system (3DSR system), respectively. It is found that all such six polarizations may in principle show separability and detectability. Moreover, the detection frequency band ($$\sim 10^{8}$$ ∼ 10 8 to $$10^{12}$$ 10 12 Hz or higher) of the signal photon fluxes by the 3DSR system and the observation frequency range ($$\sim 7\times 10^{7}$$ ∼ 7 × 10 7 to $$3\times 10^{9}$$ 3 × 10 9 Hz) of the signals by the FAST (Five-hundred-meter Aperture Spherical Telescope, China) have a certain overlapping property, and thus their coincidence experiments in the future for observations will have high complementarity.

The Design of Electromagnetic Preheating Unit for Vehicle Engines

2014 ◽  
Vol 607 ◽  
pp. 616-619 ◽  
Author(s):  
Jun Yan ◽  
Shi Tang Cui ◽  
Feng Zhang
Keyword(s):  
Magnetic Field ◽  
High Frequency ◽  
Alternating Magnetic Field ◽  
Start Up ◽  
And Inversion

After a study on the existing preheating scheme of vehicle engines, we propose to design an onboard electromagnetic preheating unit. Connected to 220v power, the unit may generate a high frequency alternating magnetic field through rectification and inversion. It will heat the engine cover directly and constantly to conduct heat to the engine and its oil so that the temperature rises up to meet the conditions for vehicles to start up.

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