The Influence of Space Radiation on the Relative Permittivity of Dielectrics

2020 ◽  
Author(s):  
Siyu Song ◽  
Hongfei chen ◽  
Xiangqian Yu ◽  
Qiugang Zong
Keyword(s):  
Electric Field ◽  
Relative Permittivity ◽  
Electron Beams ◽  
Space Radiation ◽  
Initial State ◽  
Ground Testing ◽  
Radiation Induced ◽  
Internal Charging

<p>In the study of internal charging of dielectrics inside the spacecraft, we mainly focus on the influence of conductivity of dielectrics induced by space radiation(Radiation Induced Conductivity), and regard the relative permittivity as constant. However, during the ground testing of dielectrics, we found that the relative permittivity of dielectrics decreased after being exposed to electron beams, thus affecting the electric field and the release of charge inside dielectrics. The relative permittivity can gradually returned to the initial state when the radiation stops. In the paper, we present the experiment result and try to give explanations on the mechanism behind this phenomenon.</p>

scholarly journals Space Radiation-Induced Alterations in the Hippocampal Ubiquitin-Proteome System

2021 ◽  
Vol 22 (14) ◽  
pp. 7713
Author(s):  
Alyssa Tidmore ◽  
Sucharita M. Dutta ◽  
Arriyam S. Fesshaye ◽  
William K. Russell ◽  
Vania D. Duncan ◽  
...  
Keyword(s):  
Spatial Memory ◽  
Memory Performance ◽  
Space Radiation ◽  
Label Free ◽  
Proteomic Profiling ◽  
Neurocognitive Deficits ◽  
Male Wistar Rats ◽  
Radiation Induced ◽  
Induced Changes

Exposure of rodents to <20 cGy Space Radiation (SR) impairs performance in several hippocampus-dependent cognitive tasks, including spatial memory. However, there is considerable inter-individual susceptibility to develop SR-induced spatial memory impairment. In this study, a robust label-free mass spectrometry (MS)-based unbiased proteomic profiling approach was used to characterize the composition of the hippocampal proteome in adult male Wistar rats exposed to 15 cGy of 1 GeV/n 48Ti and their sham counterparts. Unique protein signatures were identified in the hippocampal proteome of: (1) sham rats, (2) Ti-exposed rats, (3) Ti-exposed rats that had sham-like spatial memory performance, and (4) Ti-exposed rats that impaired spatial memory performance. Approximately 14% (159) of the proteins detected in hippocampal proteome of sham rats were not detected in the Ti-exposed rats. We explored the possibility that the loss of the Sham-only proteins may arise as a result of SR-induced changes in protein homeostasis. SR-exposure was associated with a switch towards increased pro-ubiquitination proteins from that seen in Sham. These data suggest that the role of the ubiquitin-proteome system as a determinant of SR-induced neurocognitive deficits needs to be more thoroughly investigated.

Effects of Dietary Supplements on Space Radiation-Induced Oxidative Stress in Sprague-Dawley Rats

2004 ◽  
Vol 162 (5) ◽  
pp. 572-579 ◽  
Author(s):  
Jun Guan ◽  
X. Steven Wan ◽  
Zhaozong Zhou ◽  
Jeffrey Ware ◽  
Jeremiah J. Donahue ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Dietary Supplements ◽  
Space Radiation ◽  
Sprague Dawley ◽  
Sprague Dawley Rats ◽  
Radiation Induced

scholarly journals Vacuum radiation induced by time dependent electric field

2017 ◽  
Vol 767 ◽  
pp. 431-436 ◽  
Author(s):  
Bo Zhang ◽  
Zhi-meng Zhang ◽  
Wei Hong ◽  
Shu-Kai He ◽  
Jian Teng ◽  
...  
Keyword(s):  
Electric Field ◽  
Time Dependent ◽  
Radiation Induced ◽  
Vacuum Radiation

Lorentz contraction of an electric field around relativistic electron beams

2021 ◽  
Author(s):  
M. Ota ◽  
K. Kan ◽  
Y. Arikawa ◽  
V. K. Mag-Usara ◽  
V. C. Agulto ◽  
...  
Keyword(s):  
Electric Field ◽  
Relativistic Electron ◽  
Electron Beams ◽  
Lorentz Contraction ◽  
Relativistic Electron Beams

Ultrafast visualization of an electric field around relativistic electron beams

2021 ◽  
Author(s):  
Masato Ota ◽  
Koichi Kan ◽  
Soichiro Komada ◽  
Yasunobu Arikawa ◽  
Verdad C. Agulto ◽  
...  
Keyword(s):  
Electric Field ◽  
Relativistic Electron ◽  
Electron Beams ◽  
Relativistic Electron Beams
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