结电阻对微波和约瑟夫逊隧道结耦合的影响

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ON THE NEUTRINO MASS,THE ABUNDANCE OF RIGHT-HANDED NEUTRINO AND THE CLOSENESS OF THE UNIVERSE

We point out that although the neutrino mass is finite,the left-handed neutrino density still dominates over the righthanded one in the universe unless there exists one or more elementary fernions (quark or lepton) whose mass is larger than 10⁶ GeV. or M_WR/M_WL≤10². (M_WLand M_WR are the left and right handed intermediate boson respectively.If there exists neutrino the mass of which is about 34 ev. as indicated in some experiments, then one can conclude that the total neutrino mass of the universe s,bvld contribute abput 99%. to the whole masses and lead to the closeness of the universe.This conclusion can be brought to the agreement of all observation datd which have been-obtained so far. A mass limit of all species of neutrinos obtained by reexamining all data is ≤ 200 eV.     

近邻原子的空间排列对非晶态铁磁体自旋波谱的影响

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THE BEHAVIOR OF THE PHASE-SHIFT IN THE BAKAMJIAN-THOMAS THEORY

The behavior of the phase-shift of the Bakamjian-Thomas theory and its relationwith the phenomenological nuclear force V=V_RiV_I at high energy are explored.Two limits are obtained:It is found that the repulsive core with a sharp outer edge may induce a characteris-tic oscillation of Re δ₁,and Im δ₁ is sensitive to V₁.The conclusion is that the analy-sis of the phase-shift extending to higher energy is relevant in determining therepulsive core and the imaginary part of the nuclear force.     

关于动态位错场张量势的规范变换

本文引入并论证了描述动态位错场的张量势(A与B)的规范交换问题,而且证明这种变换可采取这样的形式:B′=B+▽F, A′=A-ρ?/(?t)▽G,x′=x-ρ?/(?t)F,其中x_i=e_iklA_kl。至于F与G,则为带有很大任意性的时空坐标的矢量函数,但它们要满足以下关系式:F=▽×G,▽²F-1/G_t²-(?²/?t²)F=0.进 关键词：     

THE PERFECT GAS IN THE KALUZA-KLEIN UNIVERSE

The equations of state for a perfect bosonic gas in Kaluza-Klein universe M⁴ × SD have bean studied.We have derived out the variation of density, pressure and entropy density of the gas as the functions of the temperature T and the scale factor of the extra subspace R₂.A rapid change of the behavior of the gas is found to happen while R₂T is about one. A dynamical model shows that provided the dimension D of extra subspace is not too small,the gas behaves till the end of inflation stage the gas behaves till the end of inflation stage as an ordinary gas in M^4+D rather than that in M⁴ as usually expected.     

THE ORIGIN OF ENTROPY IN THE UNIVERSE

We discuss the entropy generation in quantum tunneling of a relativistic particle under the influence of a time-varying force with the help of squeezing formalism. It is shown that if one associates classical coarse grained entropy to the phase space volume, there is an inevitable entropy growth due to the changes in position and momentum variances. The entropy change can be quantified by a simple expression S=ln cosh 2r, where r, is the squeeze parameter measuring the height and width of the potential barrier. We suggest that the universe could have acquired its initial entropy in a quantum squeeze from nothing and briefly discuss the implications of our proposal.     

透射式GaAs光电阴极AlGaAs/GaAs外延层倒易点二维图分析

本文介绍了摇摆曲线和倒易点二维图在评价晶格完整性时的特点,分析了透射式GaAs光电阴极样品AlGaAs/GaAs外延层的倒易点二维图,获得了晶面弯曲以及AlGaAs外延层中Al组份变化等方面的信息,为优化外延工艺提供了可靠的保证.     

声光器件的换能器带宽和镀层厚度的确定

根据压电换能器的Mason等效电路,就36°у切LN/PM声光器件和x切LN/TeO₂声光器件以及各种镀层材料和厚度计算了换能器损耗TL随规一化频率f/f₀的变化关系,由此可确定各镀层的厚度和器件的换能器带宽,还给出器件的电输入阻抗z_i在阻抗圆图上随f/f₀变化的轨迹,它可作为器件性能测试的理论依据。 关键词：     

ON THE HYDROGEN MOLECULAR CORRECTION TO THE TRITON β-SPECTRUM AND THE MEASUREMENT OF THE NEUTRINO MASS

By using a highly accurate variational wave function with 50 parameters for hydrogen molecule^[4] and the wave function of HeH⁺ used by Wolniewicz with 64 parameters^[5], the behavior of the β-spectrum of H-T→ HeH⁺+β^-+νe is discussed. The spectral shape thus obtained deviates remarkably from the β-spectrum of an atomic triton, and hence is different from the for mula used by Lyubimov et al. in determining the neutrino mass. This means that the "atomic approximation" is invalid in describing the molecular β-spectrum of valine, and the conclusion about the value of neutrino mass based upon the analysis of β -spectrum of valine also cannot be regarded as a reliable one. Therefore, in order to obtain ari accurate value of neutrino mass from the β-spectral shape, it is important to investigate the structure of the radioactive source, from which the corection has arisen.