THE DEPENDENCE OF OVERLAP INTEGRAL ON QUARK MASS IN BETHE-SALPETER THEORY

In the literature, the overlap integral of a transition (e.g. 1^-→0^-+γ) is usuallywritten asI = ∫d³xe^iσx/2φ_f^*(x')φ_i(x) Using Bethe-Salpeter equation with instantaneous approximation, we arrive at adifferent result which depends obviously on the mass of the quarks. Our result willapproximate the above expression only when the binding energy can be neglected.     

Cl+HCl非反应截面和速率常数的TST-CEQ研究Ⅲ

本文将TST-CEQ方法推广用于计算非反应弛豫速率和平均截面, 并以Cl+HCl反应为例作了计算, 与文献结果比较表明, 这种推广是可行的, 此外, 还给出了该体系反应和非反应一维态态速率常数; 结果发现, 低温时非反应弛豫速率大于反应速率; 高温时两种通道速率相近, 表现了反应的竞争机理。     

粗糙菝葜中甾体皂甙

粗糙菝基(Smilax lebrunii Lévl)为百合科菝葜属植物,主要分布在我国甘肃、四川、湖南等地,其化学成分迄今未见报道.前文报道了防已叶菝葜植物甾体皂甙的研究工作,本文介绍从粗糙菝葜根茎中分得的2个新的甾体皂甙.用70％乙醇提取粗糙菝葜根粉(500g),将乙醇提取物经常法脱脂和除糖后,采取多次硅胶柱层析,最后用Sephadex LH-20柱纯化,甲醇洗脱分别得到甙1(50mg)和甙2(10mg).     

Synthesis of Macroporous and High Crosslinking Styrene-Methacryloyloxyphenyl Propane-(bisvinyl-A) Copolymers

Up till now, the crosslinking agent used in the preparation of highcrosslinking polystyrene has usually been divinylbenzene(DVB), which usually results in the crosslinking net structure of styrene-DVB copolymer being uneven. On the contrary, bisvinyl-A has the well compatibility with styrene,which can polymerize to form an even copolvmer, this copolymer has well     

离子注入对YBa2Cu3O7-x薄膜超导性能的影响

本文报道了Ar和F离子注入对YBa₂Cu₃O_7-x超导薄膜电学性能及结构的影响,通过X射线衍射和电阻温度关系的测量研究了离子注入后YBa₂Cu₃O_7-x薄膜T_c,J_c和结构的变化。实验中发现,在低剂量注入情况下,T_c和J_c随着注入剂量的增加而下降。但是,上临界温度和X射线衍射谱却几乎保持不变。当Ar离子的注入剂量达到1.2×10¹³Ar/cm²时,样品发生金属一半导体相交。当注入剂量大于1.2×10¹³Ar/cm²时,样品的体超导性能基本上完全消失了,X射线衍射峰的强度也有所减弱,最终发生了晶态-非晶态相变,室温电阻率增加了好几个数量级。讨论了超导性能变化及金属一半导体相变的物理起因。     

Changing Rules of Bonding Electron Pair Correlation Energies of CH3X （X = F, OH, NH2） Systems

1 INTRODUCTION It has been known that the electron correlation energy of molecular systems was, and still is, one of the most serious bottleneck problems to the chemis- try accuracy of computational quantum chemistry. Since L鰓din[1] gave the definition …     

The Incompressible Limits of Compressible Navier-Stokes Equations in the Whole Space with General Initial Data

It is showed that, as the Mach number goes to zero, the weak solution of the compressible Navier-Stokes equations in the whole space with general initial data converges to the strong solution of the incompressible Navier-Stokes equations as long as the later exists. The proof of the result relies on the new modulated energy functional and the Strichartz＇s estimate of linear wave equation.