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<正>这类钟的优势在于使用的原子数量;它不是按照单个原子的节奏嘀嗒走针,而是同时与几千个原子同步。从1955年原子钟出现至今,量子时间计量的准则一直没有改变:将原子与外场隔离,调谐相干辐射源频率到原子跃迁,并通过对辐射振荡周期的计数来测量时间。 相似文献
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<正>声空化主要是研究空泡在声场下的动力学及其产生的一些物理和化学现象的一门学科。这门学科有着丰富的内涵,比如传热、传质、非线性和混沌等。图1显示了单个空泡在声场下的非线性振荡。在一个空泡振荡周期内,空泡先逐渐膨胀,直到半径增加至其初始半径的数倍,然后空泡迅速地进行若干次溃灭(即空泡半径减小)。在一定的声场参数下,空泡可以产 相似文献
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On the Existence of Oscillating Periodic Solutions of Differential Difference Equation With N Time Lags 总被引:2,自引:0,他引:2
In this paper,the existence of nonconstant oscillating periodic solution of differential difference e-quation with n time lags is stutied:x′(t)=-g(x(t))[f(x(t-τ1)) f(x(t-τ2)) … f(x(t-τn))] the results of Paper[1-6] are extended and improved. 相似文献
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The propagation behaviour of terahertz (THz) pulses at an edge is characterized. The phenomenon that the amplitude oscillates periodically in the frequency spectrum is similar to Young's interference, if the absorption effect is neglected. The oscillation cycle is shorter for a thicker sample. THz pulses at an edge are analyzed by the broadband Huygens-Fresnel diffraction integral. The experimental results are in agreement with the simulation results approximately. The simulation errors are also analyzed. 相似文献
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根据振荡电路产生不同周期的计时信号,对打点计时器的供电电源进行了改进。改进后,实验者可根据不同的运动速度来选择适宜的打点计时单位,使纸带上的点疏密程度较为合理,从而减少测量误差。 相似文献
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乳酸-溴酸钾-硫酸锰-硫酸-丙酮体系的B-Z振荡反应 总被引:7,自引:0,他引:7
This paper presents a study of the concentration range of reactant of oscillation reaction in α-hydroxy-propionic acid-KBrO3-MnSO4-H2SO4-propanone system. The special feature of the reaction is a damped oscillation. A section of the damped oscillation wave is similar to a spindle. Effects of many factors on the oscillation have been examined. The period and amplitude as function of the initial concentration of each reactant have been studied. It was found that mumbers, period and amplitude of each section of damped oscillation and preoscillatory time depend on the initial concentrations of the reactants. 相似文献