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Electron temperature fluctuation in the HT-7 Tokamak plasma observed by electron cyclotron emission imaging 下载免费PDF全文
The fluctuation of the electron temperature has been measured by
using the electron cyclotron emission imaging in the Hefei Tokamak-7
(HT-7) plasma. The electron temperature fluctuation with a broadband
spectrum shows that it propagates in the electron diamagnetic drift
direction, and the mean poloidal wave-number $\bar{k}_{\theta}$is
calculated to be about 1.58 cm-1, or
\bar{k}θ ρs≈ 0.34. It indicates that the
fluctuation should come from the electron drift wave turbulence. The
linear global scaling of the electron temperature fluctuation with
the gradient of electron temperature is consistent with the mixing
length scale qualitatively. Evolution of spectrum of the fluctuation
during the sawtooth oscillation phases is investigated, and the
fluctuation is found to increase with the gradient of electron
temperature increasing during most phases of the sawtooth
oscillation. The results indicate that the electron temperature
gradient is probably the driver of the fluctuation enhancement. The
steady heat flux driven by electron temperature fluctuation is
estimated and compared with the results from power balance
estimation. 相似文献
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以不同含水量细菌纤维素为模板,苯胺单体为原料原位聚合生成聚苯胺,制备出不同含水量细菌纤维素/聚苯胺(HBC/PANI、LBC/PANI及DBC/PANI)复合凝胶膜,系统研究了细菌纤维素凝胶膜含水量和反应时间对苯胺原位聚合以及复合凝胶膜微观形貌、电学性能和力学性能的影响.扫描电镜照片表明聚苯胺均匀包覆在BC纤维上形成导电网络结构;四探针测试表明聚合时间90 min时导电率最高;低含水量加快了聚合反应速度,提高了复合凝胶膜的电导率,而完全干燥则使电导率降低;交流阻抗测试也表明低含水量可以明显提高材料的离子导电性;力学性能测试结果表明了BC/PANI复合凝胶膜具有良好的机械性能,抗拉强度可达0.21 MPa,同时低含水量不会降低复合凝胶膜的力学性能. 相似文献
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