scholarly journals COHERENT THZ ELECTROMAGNETIC RADIATION EMISSION AS A SHOCK WAVE DIAGNOSTIC AND PROBE OF ULTRAFAST PHASE TRANSFORMATIONS

2009 ◽  
Author(s):  
Evan J. Reed ◽  
Michael R. Armstrong ◽  
Ki-Yong Kim ◽  
James H. Glownia ◽  
William M. Howard ◽  
...  
Keyword(s):  
Shock Wave ◽  
Electromagnetic Radiation ◽  
Phase Transformations ◽  
Radiation Emission

Phase transformations in Ni3AI, Ti3AI and Ti2AINb intermetallics under shock-wave loading

2003 ◽  
Vol 110 ◽  
pp. 923-928 ◽  
Author(s):  
N. V. Kasantseva ◽  
B. A. Greenberg ◽  
A. A. Popov ◽  
E. V. Shorokhov
Keyword(s):  
Shock Wave ◽  
Phase Transformations ◽  
Shock Wave Loading ◽  
Wave Loading

Method of Far-field Electromagnetic Radiation Prediction and Suppression Based on Equivalence of Capacitance Parameters in Power Converter System

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Li Zhengzhi ◽  
B Zhang Kaiyan ◽  
Wang Shishan ◽  
A Guo Jian
Keyword(s):  
Electromagnetic Radiation ◽  
Research Area ◽  
Power Converter ◽  
Path Model ◽  
Scattering Parameter ◽  
Radiation Emission ◽  
Current Path ◽  
Key Issues ◽  
Magnetic Ring ◽  
Good Agreement

Electromagnetic radiation is one of the key issues in research area of EMC. This paper analyzes that common-mode (CM) current is the main noise source, and transmits through parasitic capacitances between input cables and ground, thus CM current path model (CCP) is established. Moreover, CCP is formed as equivalent prediction model of radiation (EMR) by appropriate simplification. The parasitic capacitances of EMR are extracted, and EMR is iterative designed. Furthermore, the radiation emission of two models is in good agreement. At last, ferrite magnetic ring is selected to change scattering parameter matrix, thus electromagnetic radiation can be suppressed; the recommended installation of magnetic ring is given. Keywords: Radiation; Parasitic Parameter;

Electrical Generation of Spontaneous Optical Emission in Electrically Modulated Two-Dimensional Electron Gases at Low-Temperatures

1998 ◽  
Vol 12 (05) ◽  
pp. 579-590
Author(s):  
W. Xu ◽  
C. Zhang
Keyword(s):  
Electromagnetic Radiation ◽  
Low Temperatures ◽  
Low Frequency ◽  
Optical Emission ◽  
Two Dimensional ◽  
Dimensional Electron ◽  
Electron Gases ◽  
Radiation Emission ◽  
Electrical Generation ◽  
Electrically Modulated

A detailed theoretical study is presented for spontaneous optical emission from a two-dimensional electron gas (2DEG) in the presence of a unidirectional spatially periodic modulation at low temperatures. The momentum- and energy-balance equations for electron–photon interactions in the device system are solved self-consistently using the Boltzmann equation, from which we can obtain the frequency and the intensity of the electromagnetic radiation generated. The results obtained indicate that: (1) in an electrically modulated 2DEG at low temperatures, a strong electromagnetic radiation emission up to W/cm2 can be generated by applying a small d.c. electric field; (2) the radiation emission is generated indirectly in the occupied subbands through electronic transitions around the Fermi level; (3) the frequency of the radiation generated is at about 0.1 THz; (4) in the low frequency regime, spontaneous multiphoton emissions can be observed; and (5) this type of optical emission depends strongly on the sample parameters such as the electron density of the 2DEG and the modulation length.

Electromagnetic Radiation Emission Model of Motor Drive System

2015 ◽  
Vol 764-765 ◽  
pp. 501-505
Author(s):  
He Meng Peng ◽  
Quan Di Wang ◽  
Yong Ming Yang
Keyword(s):  
Electromagnetic Radiation ◽  
Electromagnetic Interference ◽  
Drive System ◽  
Motor Drive ◽  
Emission Model ◽  
The Finite Element Method ◽  
Radiation Emission ◽  
Proposed Model ◽  
Three Phase ◽  
Motor Drive System

The electromagnetic radiation emission model of motor drive System for electric vehicles (EVs) is presented in this paper. First, the radiation electromagnetic interference (EMI) mechanism of the motor drive system is analyzed and investigated by experiment. The radiation EMI mainly comes from the common mode current flowing along the three phase cable between the inverter and the motor. Secondly, the feasibility of the finite element method (FEM) is verified by calculating the wire electromagnetic field around and the radiation EMI model of the motor drive system is established using the FEM. The simulation and experimental results show that the proposed model is feasible.

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