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在稳态法测量不良导体的导热系数实验中,研究了提高加热盘温度、降低环境温度和关闭散热风扇对实验关键参数、导热系数测量误差和实验时长等影响。研究表明,实验条件对稳态时散热盘的温度T2和散热盘T2时的冷却速率均有显著影响,对导热系数的影响主要与影响实验的系统误差有关。通过提高加热盘温度或降低环境温度,能够在测量误差影响不大的前提下有效缩短实验时长;通过关闭散热风扇可以降低面积修正引入的系统误差,但是实验时间延长。 相似文献
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Excitation of chorus-like waves by temperature anisotropy in dipole research experiment (DREX): A numerical study
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Due to their significant roles in the radiation belts dynamics, chorus waves are widely investigated in observations,experiments, and simulations. In this paper, numerical studies for the generation of chorus-like waves in a launching device,dipole research experiment(DREX), are carried out by a hybrid code. The DREX plasma is generated by electron cyclotron resonance(ECR), which leads to an intrinsic temperature anisotropy of energetic electrons. Thus the whistler instability can be excited in the device. We then investigate the effects of three parameters, i.e., the cold plasma density nc, the hot plasma density nh, and the parallel thermal velocity of energetic electrons, on the generation of chorus-like waves under the DREX design parameters. It is obtained that a larger temperature anisotropy is needed to excite chorus-like waves with a high nc with other parameters fixed. Then we fix the plasma density and parallel thermal velocity, while varying the hot plasma density. It is found that with the increase of nh, the spectrum of the generated waves changes from no chorus elements, to that with several chorus elements, and then further to broad-band hiss-like waves. Besides, different structures of choruslike waves, such as rising-tone and/or falling-tone structures, can be generated at different parallel thermal velocities in the DREX parameter range. 相似文献
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