共查询到18条相似文献,搜索用时 109 毫秒
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扭摆法是测量物体转动惯量的有效方法,其不确定度分析是关键.本文推导了扭摆法测物体转动惯量准确的不确定度传递公式,得到各直接测量量及其不确定度对转动惯量不确定度的影响.并进行了算例分析.结果表明,扭摆法比三线摆测得物体的转动惯量的误差以及不确定度要小很多.这对实验方法的选择和仪器的研制具有重要的实际意义. 相似文献
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针对传统扭摆法测物体转动惯量系统误差较大的缺点,在扭摆的改进和实验数据的处理方面提出了行之有效的方法,从而达到减小系统误差的目的. 相似文献
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通过声卡并运用Audition软件可以对扭摆次数和时间进行自动记录和保存,计算出扭摆周期,从而测定刚体转动惯量.从图形上读出时间数据具有直观、快捷、准确的特点,减少了由于人为因素造成的误差. 相似文献
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在当前大学物理实验扭摆法测量物体转动惯量实验中,通常将"几何法"与"扭摆法"相互交织,导致实验过程逻辑混乱.本文提出删除用"几何法"倒推"扭摆法"中弹簧扭转常数K值这一环节,改用"定义法"直接测量K值,从而将"几何法"与"扭摆法"隔离,并重新设计了实验内容,使实验条理更加清晰. 相似文献
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Summary The internal friction (loss tangent) of solids is normally measured, as a function of temperature, with a torsion pendulum
operating in free decay. Curves of the internal friction and the oscillation frequency, against temperature, are obtained
at various moments of inertia, to extract the parameters characteristic of the relaxation process (relaxation time and strength).
In all these experiments only the temperature is considered as an independent variable and the moment of inertia of the pendulum
is mainly used to shift the internal friction peaks in the temperature scale. It is pointed out in the paper that the moment
of inertia is also an independent variable which can be used to determine, with high accuracy, if the measured peak is of
the Debye type or not. A new torsion pendulum, with continuously variable moment of inertia is presented, which allows measurements
of the partial derivative of the internal friction and the oscillation frequency with respect to the moment of inertia, at
constant temperature. Finally, some measurements of the Snoek relaxation in Nb-O alloys are presented, to show the applicability
of the concepts developed in the paper.
The authors of this paper have agreed to not receive the proofs for correction. 相似文献
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本文研究分析扭摆法测量转动惯量实验的系统误差来源,在此基础上对实验方法、装置提出改进,改进后实验结果与理论值的百分差可降低一至二个数量级. 相似文献
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The standard evaluation of the partition function Z of Schwarz's topological field theory results in the Ray–Singer analytic torsion. Here we present an alternative evaluation which results in Z=1. Mathematically, this amounts to a novel perspective on analytic torsion: it can be formally written as a ratio of volumes of spaces of differential forms which is formally equal to 1 by Hodge duality. An analogous result for Reidemeister combinatorial torsion is also obtained. 相似文献
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Based on the theory of gravitation with torsion developed by Hammond [Rep. Prog. Phys. 65 (2002) 599], the interaction between the intrinsic spin of a particle and the mass source is calculated. It is shown that spin can interact with the gravitimagnetic field created by a rotational mass, where the spin-rotation coupling is also discussed. According to the recent torsion pendulum experiment with polarized electrons by Heckel
et al. [Phys. Rev. Lett. 97 (2006) 021603], we set a new limit
on the value of the torsion coupling constant K as K∈[0.53,0.95],
which has improved many orders than the constraints from the early spin-spin
experiment with K<2×1014. 相似文献
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B.P. van Eijck 《Journal of Molecular Spectroscopy》1982,91(2):348-362
The consistency of the substitution method has been checked by examining the change of the planar moment of inertia upon substitution in those cases where this change should be zero by symmetry. From 438 literature data it was concluded that Costain's estimate for the reliability of substitution coordinates is adequate except for the HD substitution where it is too optimistic by at least a factor of 2. A special case is formed by the substitution CH3CH2D, where absurdly large differences in the planar moments of inertia occur. It is shown that these differences can be largely eliminated when the effects of the torsion on parent and substituted molecules are properly accounted for. Approximate formulas for this purpose are derived and tested. It appears that neglect of these corrections is not justified when the geometry of a methyl group is to be determined accurately. 相似文献