Large Decay Rate Variation of ^7Be in Pd and Au

Platinum and gold have the similar crystal structure but different electronic affinities, as well as different effective electron densities near the implanted ions. Both the differences favour larger decay rate of ^7 Be in Pd than that in Au. We measured the variation of the decay rate of ^7Be implanted in Pd and Au host materials. We have found that the decay rate of ^7 Be in Pd is larger than that in Au by 0.8%.     

广西融水北高村人的遗传学和体质人类学特征

本研究用适合民族研究的Y染色体非重组区单核苷酸多态(SNP)单倍型分析方法检测了北高村人和广西已定水族男子的遗传学特征，并对北高村人的男女都进行了体质特征观测分析。两种方法都得出了北高村人与水族相当一致，而与汉族较远，综合地证实了北高村人与水族的血缘关系，鉴于民族不是简单的遗传概念，民族成分的正式确认还要解决各方面问题，仍须慎重进行。     

回归式减速器的最佳尺寸选择

本文介绍了为新型轻便型灰浆搅拌机配套的回归式齿轮减速器的优化设计。设计结果表明，经优化设计的减速器尺寸有明显的减小，文章还给出了几个主要设计变量与整体尺寸关系的分析，可供设计时参考。     

谈谈正确理解电子电路中有关约束条件的重要性

全面考虑电路的约束条件，对于正确地分析电子电路是非常重要的。本文通过具体的应用实例，强调正确地、全面地理解约束条件在电子电路分析中的重要性。     

克服“空怀”果树的措施

生长过旺的果树,往往出现低产或“空怀”。其原因主要是营养生长占优势,生殖生长变劣势。所以要采取相应的技术措施,克服“空怀”。具体方法如下: 一、断根。断根的目的是减少根系对水分养分的吸收,促进生殖生长。做法是:结合深耕改土,沿着树冠垂直线下挖一条约60～70厘米深,宽35～40厘米     

酵母菌呼吸缺陷型和野生型线粒体DNA比较

以酒精酵母，ＩＦＦＩ１３００ 材料，建立了以”蜗牛酶＋机械振荡“复俣自理破碎细胞的方法；先提取并纯化线粒体，后从线粒体中提取线粒体ＤＮＡ的方法，得到了紫外吸收Ａ２６０／２８０为１．８２３，琼脂糖电泳为一条带且分子量大λＤＮＡ的线粒体ＤＮＡ。     

Dynamical Evolution of Globular Clusters in the Galaxy

Given the initial conditions of spatial density distribution, velocity distribution and mass function, the dynamical evolution of globular clusters in the Milky Way is investigated in details by means of Monte Carlo simulations.Four dynamic mechanisms are considered: stellar evaporation, stellar evolution, tidal shocks due to both the disc and bulge, and dynamical friction. It is found that stellar evaporation dominates the evolution of low-mass clusters and all four are important for massive ones. For both the power-law and lognormM initial clusters mass functions, we can find the best-fitting models which can match the present-day observations with their main features of the mass function almost unchanged after evolution of severM Gyr. This implies that it is not possible to determine the initial mass function only based on the observed mass function today. The dispersion of the modelled mass functions mainly depends on the potential wells of host galaxies with the almost constant peaks,which is consistent with current observations.