光场与Ⅴ型三能级原子依赖强度耦合系统场熵的演化特性

研究了光场与v型三能级原子依赖强度耦合系统场熵的演化特性,讨论了单光子跃迁失谐量和初始光子数对场熵演化的影响.研究结果表明,当失谐量比较小且初始光场较弱时,场熵的时间演化行为与单光子JaynesCummings模型相似;当失谐量足够大或初始光场足够强时,场熵的时间演化表现出类似于双光子Jaynes-Cummings 模型中场熵演化的周期性.     

关于强子中胶子分布函数的QCD预言

本文对Altarelli-Parisi方程采用Mellin变换方法解析地求得胶子分布函数的级数解析表达式,这个级数收敛得很快,利用它讨论了胶子分布函数的演化行为.     

我国高压物理的进展—三十年来的回顾

我国高压物理学科是在五十年代末着手筹建的．三十年来我国高压物理在赶超世界先进水平方面取得了不少重要进展．本文简介了三十年来我国高压物理在静压部分，包括高压购理实验技术、高压下物质的相变和性质、高压下人造金刚石等超硬材料三方面的研究进展．     

CnH2n(n=2,3,4)与BX3(X=H,F,Cl)作用的DFT研究

用量子化学的密度泛函理论方法对BX3(X=H,F,Cl)与烯烃CnH2n(n=2,3,4)形成的复合物进行了研究,结果表明,复合物的构型皆为BX3位于烯烃π键的上方,并且偏向氢原子数较多的碳原子一侧.C-C双键中的π电子通过向BH3中B的空p轨道转移电子而形成复合物,但BF3和BCl3与烯烃分子只是通过微弱的分子间作用力结合,复合物的形成使分子的振动光谱随作用的强弱而出现一定的红移现象.     

First-Principles Prediction of High-Pressure Phase of CaC6

The lattice dynamics of rhombohedral GaG6 is studied as a function orpressure to probe Its high pressure phase with low superconducting transition temperature using the density functional liner-response theory. The pressureinduced phase transition in CaC6 is attributable to the softening transverse acoustic （TA） phonon mode at the zone boundary X （0.5, 0.0, 0.5） point. The high pressure phase is then explored by performing fully structural optimization in the supercell which accommodates the atomic displacements corresponding to the eigenvectors of the unstable mode of TA（X）. The high-pressure phase is predicted to be a monoclinic unit cell with space group P21/m.     

Single-Proton Pickup Reaction of the Halo Nucleus ^6He on a ^9Be Target at 25 MeV/nucleon

The inclusive differential cross sections of the ^7 Li nucleus in a reaction induced by ^6He on a ^9Be target are measured at an incident energy of 25 MeV/nucleon. Finite-range distorted-wave Born approximation calculations suggest that these ^7 Li particles are formed in a direct single-proton pickup reaction ^9Be（^6He,^7 Li）^8Li. The experimental data can be well reproduced by taking into account of the contributions of both the ground states and the first excited states of ^7Li and ^8Li.     

Light Irradiation through Small Particles and Its Applications for Surface Nanostructuring in Near Field

We investigate the light scattering through small particles and its applications in nanostructuring, such as nanobumping, nanopatterning and dry laser cleaning. The theoretical calculation based on Mie theory provides an exact solution for sphere cavity resonance and plasmon resonance, which are two mechanisms for dielectric and metallic particles assisted surface nanostructuring in near field. The experimental results indicate that nanobumps on glass surface and subwavelength holes array on silicon surface can be formed without cracks with the self-assembly of 1 μm silica particle mask under laser irradiation. It is also found that the scattering wave by 40 nm gold particles can propagate 200 times away in terms of particle radius as recorded by photoresist under the UV light irradiation. Meanwhile, dry laser cleaning of 40nm gold particle on silicon wafer is demonstrated at plasmonic resonance frequency. The total cleaning efficiency is estimated to be 80%.     

托卡马克实验数据的可视化时序处理软件开发

运用VBA在Excel中的编程,编制了托卡马克实验数据的时序处理软件。使HL-1M和HL-2A装置标准格式数据在Excel表中能被直接读取并进行图形显示;且能将Excel表格中的实验数据直接传递给MATLAB系统。从而输出多道时序图形。并在MATLAB独立环境下,开发了具有读取标准实验数据、进行图形显示、可视化界面及部分高级处理功能的软件系统。     

4-(2-羟基-4-硝基苯偶氮)-1-苯基-3-甲基吡唑啉酮光度法测定烟草中镁

研究了 4 - (2 -羟基 - 4-硝基苯偶氮 ) - 1-苯基 - 3-甲基吡唑啉酮 (HNAPMP)与镁的显色反应 ,在 p H=10的硼砂 -氢氧化钠缓冲介质中 ,HNAPMP与镁反应生成 2∶ 1稳定络合物 ,λmax=5 2 2 nm,ε=3.5 8× 10 4L·mol-1· cm-1。镁含量在 0— 2 0 μg/2 5 m L范围内符合比耳定律 ,方法用于烟草样品中镁含量的测定 ,结果令人满意     

微波消化-固相萃取光度法测定生物样品中的钴

根据 2 - (2 -喹啉偶氮 ) - 1,5 -苯二酚 (QADHB)与钴的显色反应及 C18固相萃取小柱对显色络合物的固相萃取 ,建立了一种测定生物样品中痕量钴的新方法。在 p H=4 .0的 HAc- Na Ac缓冲介质中 ,溴化十六烷基三甲基铵 (CTMAB)存在下 ,QADHB与钴反应生成 2∶ 1稳定络合物 ,该络合物可用 C18固相萃取小柱富集 ,小柱上富集的络合物用乙醇 (内含 2 %乙酸 )洗脱后用光度法测定 ,络合物最大吸收波长为5 80 nm,钴含量在 0— 0 .8μg/m L范围内符合比耳定律 ,摩尔吸光系数 ε=5 .6× 10 4L· mol-1·cm-1。本方法用于几种生物样品的分析 ,结果令人满意。