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Preliminary investigation on the design and experiment of a spatial filter for dual band high power microwave一种高功率微波空间滤波器的设计与初步实验研究
,,,,,,,,,李国林,,,,,,,,
Keywords: ,,,diplexer高功率微波,,,
A spatial filter/diplexer for gigawatt level high power microwave is theoretically and experimentally investigated in this paper. The spatial filter consists of several cylindrical rods which are located in the near field of the applied radiating antenna. The S/X dual band microwaves are reflected and transmitted by the spatial filter in the same propagation directions. In the low power experiments, the transmitted and the reflected patterns are very close to that of the applied antenna. The measured reflection and transmission efficiencies, calculated from the power densities in the far-field region, are about 96% and 97% respectively. In addition, the spatial filter has the isolation level higher than 25 dB and the cross polar level much lower than -25 dB. Under the illumination by S/X band high power microwave with a pulse magnitude of about 1.5 GW and duration of about 100 ns, no microwave breakdown is observed.
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自然風韵Bioeffects of CdTe quantum dots on human umbilical vein endothelial cells. - Abstract - Europe PMC
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Liping Wang
Yifan Zheng
Qunwei Zhang
Xinqiang Zhu
Department of Toxicology, Zhejiang University School of Public Health, Hangzhou, Zhejiang 310058, China.
Journal Article, Research Support, Non-U.S. Gov't
10.1166/jnn.
Quantum dots (QDs) hold great potential for applications in nanomedicine, however, their health effects are largely unknown. In the present study, the cytotoxicity and genotoxicity of CdTe QDs were examined in human umbilical vein endothelial cells (HUVECs). The QDs exhibited a dose-dependent inhibitory effect on cell growth. It was shown that after a 12 h treatment QDs at 1, 10, and 50 microg x ml(-1) induced formation of yH2AX foci, indicative of DNA damage, in a dose-dependent manner. Moreover, QD treatment clearly induced the generation of reactive oxygen species (ROS). Pre-treatment with N-acetyl-cysteine (NAC), a ROS scavenger, could inhibit the induction of ROS by QDs, as well as the formation of yH2AX foci. Taken together, our data indicate that CdTe QDs have cytotoxic and genotoxic effects on HUVECs, and that ROS generation may be involved in QD induced DNA damage.
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