共查询到17条相似文献,搜索用时 93 毫秒
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为了满足电位差计实验对毫伏级待测电动势的需求,设计了三种毫伏级待测电动势实验仪,并对其稳定性进行了研究。设计的三种待测电动势实验仪不但满足电位差计实验的需要,而且能大大提高学生的实验效率和增加教师设计实验的选择性。 相似文献
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用板式电位差计测电池的电动势和内阻的实验研究 总被引:1,自引:0,他引:1
给出了用板式电位差计测电池电动势和内阻的原理与方法,分析了如何选取电路中的电池E、标准电阻Rs和限流电阻R的取值,使实验效果最佳。运用最小二乘法处理实验数据,实验结果令人满意。 相似文献
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用电位差计测电源电动势是大学物理实验中一个典型的电学实验,由于运用到了补偿法测量原理使测电动势的精确度提高.电位差计不仅可以用来精确测量电源电动势,还可用来测量电流、电阻等等,由于其在工程领域里的广泛应用,电们差计实验是工科学生在大学中常做的大学物理实验之一. 相似文献
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本文报道了用于超导TES(Transition Edge Sensor)测辐射热计的Al/Ti双层薄膜制备及其超导特性研究.通过分析Al薄膜表面粗糙度和室温电阻率在不同溅射功率和氩气压力下的变化关系,优化了Al薄膜的制备工艺.使用磁控溅射技术生长了一系列不同厚度的Al/Ti双层薄膜,在氦三制冷机中测量了双层膜的超导特性.测试结果表明,Al/Ti双层薄膜具有良好的超导相变特性,在10μA测试电流下,其相变宽度保持在3mK~6mK范围内,在超导临界温度下电阻对温度的灵敏度参量α在300左右;由于超导邻近效应(Proximity effect),双层薄膜的临界温度可以通过控制Ti薄膜的厚度实现在470mK~800mK温区内的调节.Al/Ti双层薄膜的这些性能满足了制备超导TES测辐射热计的需要. 相似文献
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分析了单声光移频器构成的外差式激光多普勒测振计中声光移频器驱动信号的频率稳定性和信号功率对待测振动信号的影响.为了降低声光移频器驱动信号频率漂移的影响,提出双声光移频器构成的外差式激光多普勒测振计,并基于直接数字频率合成技术,以相位噪音低、初始相位可控的芯片AD9912为核心器件,完成了声光移频器驱动信号生成及处理模块的设计.开展了双声光移频器组成的外差式激光多普勒测振计的振动测量实验,结果表明,驱动信号生成装置可以驱动声光移频器正常工作,且测振计的本底噪音在0~10kHz频带范围内呈现平坦分布,0~1kHz频段内噪音得到明显抑制,较单声光移频器构成的外差式激光多普勒测振计有显著改善. 相似文献
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以"动电动模型"和"电动电模型"为例,从微观的角度出发,对感应电动势、感应电流的形成以及能量的转化进行分析,目的在于将宏观的认知和微观的内在本质统一起来,以期深入浅出地进行有效教学. 相似文献
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The stability of an isothermal thin disk with three-dimensional magnetic fields and radial viscous force is examined in this paper. We find that the radial viscous force has no influence on the stability of viscous modes. But there is more influence on the stability of magneto-acoustic modes, which is related to the perturbation wavelength and different parts of disk. Finally, we use our model to explain the long-term variability of Quasar 3C345. 相似文献
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Technical Physics - The results are presented for the initial form stability analysis of the optimal aerodynamic design algorithm in context of an isolated three-dimensional wing of a wide-body... 相似文献
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Transverse vibration and stability analysis of circular plate subjected to follower force and thermal load are analyzed . B ased on the thin plate theory in involving the variable temperature, the differential equation of transverse
vibration for the axisymmetric circular plate subjected to follower force and thermal load is established. Then, the differential equation of vibration and corresponding boundary conditions are discretized by the differential quadrature
method. Meanwhile, the generalized eigenvalue under three different boundary conditions are calculated. In this case, the change curve of the first order dimensionless complex frequency of the circular plate subjected to the follower
force in the different conditions with the variable temperature coefficient and temperature load is analyzed. The stability and corresponding critical loads of the circular plate subjected to follower force and thermal load with simply supported edge, clamped edge and free edge are discussed. The results provide theoretical basis for improving the dynamic stability of the circular plate. 相似文献
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