共查询到20条相似文献,搜索用时 46 毫秒
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结合"单臂电桥测电阻"这个实验的特点提出了一个设计性实验,并给出了解决方案.在指导学生做该实验时,要求学生来完成这个设计,可以帮助学生理解单臂电桥测量电阻的原理. 相似文献
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介绍了惠斯通电桥测电阻的原理,给出了电桥灵敏度的定义和公式。利用电桥测量了未知电阻的阻值和电桥灵敏度,用实验分析和验证了影响电桥灵敏度的因素。 相似文献
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谈双“单电桥”测低电阻的两类方法 总被引:2,自引:2,他引:0
谈双“单电桥”测低电阻的两类方法李龙海(北京理工大学应用物理系,100081)物理实验中,人们常称惠斯登电桥为“单电桥”,认为其只适于测10Ω一108Ω之间的“中电阻”,至于欲测1Ω以下的“低电阻”,只能应用“双电桥”——开尔文电桥.其实不然,我们利... 相似文献
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惠斯通电桥的灵敏度是影响其测量精度的关键因素。对电压法和电流法惠斯通电桥测电阻实验进行了理论探讨和实验验证,发现电桥灵敏度与桥臂电阻密切相关。提出最佳桥臂电阻的计算公式,为惠斯通电桥的精确测量提供便利。 相似文献
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迈克耳孙-莫雷实验
在古希腊,以太(Ether)指的是青天或上层大气.17世纪时,法国科学家笛卡儿(René Descartes)最先将以太引进科学,并赋予它某种力学性质.后来,以太又在很大程度上作为光波的荷载物,同光的波动学说相联系. 相似文献
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从60年代开始,我所就开展了聚变中子积分实验,完成了造氚率、裂变率、穿透率及泄漏中子能谱测量等研究课题.1987年以来承担了“863”计划的聚变裂变混合堆包层中子学积分实验,开展了Be、Pb的14MeV中子倍增率实验,其中Be实验为中、美、日国际合作,实验误差为2.8%,实验结果为理论计算提供积分检验.新的一轮中、美、俄的更大厚度的Be中子倍增率实验国际合作正在进行之中.现在,中美关于核聚变合作已经确定了17个项目,我所承担了其中的“关于ITER和建议的聚变堆包层及屏蔽系统的中子学积分实验”这一项目. Since 1960s, the fusion neutronics integral experiments have been carried outin our institute. Several research subjects, including the measurements of the tritium production rate,the fission rate,the leakage rate and the neutron energy spectra, have been finished. Since 1987,neutronics integral experiments of the blanket in the fusion-fission hybridreactor in the "863" project have been taken on. The experiments of 14MeV neutron multiplication in Be and Pb have been performed and the experimental error is ... 相似文献
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Olof Echt 《Hyperfine Interactions》1987,38(1-4):685-698
In this contribution we discuss four different types of experiments that have been conducted at molecular beams of neutral
clusters. The size of particularly stable sodium chloride clusters and their corresponding geometrical structure is inferred
from intensity anomalies in mass spectra. This information is obtained either for charged or for neutral clusters depending
on whether the clusters are ionized by electron impact or by multiphoton absorption. The important role of fragmentation in
mass spectrometry of xenon clusters is revealed by multiphoton ionization; dissociative reactions occurring on the time scale
of 10−7 s with respect to the ionizing event can be analyzed. The solvation energy of negatively charged carbon dioxide clusters
as a function of cluster size is obtained from electron attachment spectra. A resonance in the ion yield close to zero eV
electron energy signifies that all clusters except for the monomer feature a positive electron affinity. An analysis of the
kinetic energy of fragment ions, originating from delayed dissociation of triply charged carbon dioxide clusters, reveals
that the size distribution of their fission fragments is extremely symmetric. 相似文献
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At the COSY cooler synchrotron several experimental facilities are in operation at internal and external target stations. The combination of a high quality low emittance proton beam with high acceptance detector systems allows precise and complete experiments. The momentum range of the COSY beam from 300 MeV/c up to about 3.5 GeV/c opens a large field of experimental studies. One main topic of the present experiments is strangeness production with emphasis to the threshold region. 相似文献
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高中实行新课程改革的目标就是要对学生实施素质教育,让学生按照自己的爱好特长和将来的发展方向,挑选自己感兴趣的课程,有选择地进行学习. 相似文献
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How do we learn about the electronic and atomic characteristics of novel materials for efficient solar energy conversion (photovoltaics and water-splitting), energy storage (Li-ion batteries and multivalent-ion batteries), and efficient catalytic activity and selectivity in catalysis? The fundamental scientific problems that we plan to understand and ultimately control are: (1) efficient absorption-induced electron-hole pair formation and its separation at the complex interfaces; (2) bandgap, band levels, and band structure of earth abundant materials that are of crucial importance in electrochemical and photocatalytic applications. 相似文献