芳氨基硫脲类化合物的质谱研究（Ⅱ）

本文报道了五种新的芳氨基硫脲类化合物，即１－（４－溴－２－羧基苯基）－４－烷基氨基硫脲的电子轰击质谱（ＥＩＭＳ）。结果表明，该类化合物的分子离子峰（Ｍ＋）很弱，但却具有效强的［Ｍ－Ｈ］＋峰。分子离子的断裂以Ｎ－Ｎ键和Ｃ－Ｎ键的断裂为主，并伴随着六员环或四员环过渡态氢重排，生成相应的芳氨基正离子和芳肼基正离子，这两种离子继续失水或失其它小分子，从而形成一系列特征离子，包括骨架重排离子。     

二元合金界面平衡偏析的预测——Ⅰ.晶界偏析与晶间脆性的预测

本文首先评述了可用于预测界面平衡偏析的理论:理解偏析规律及影响因素,讨论了如何获得用于预测参量的方法;其次,提出预测晶界偏析及表面偏析的方法和程序.     

Statistical Thermodynamic Properties of Linear Protein Solutions

利用统计力学理论结合格点模型,讨论了链状蛋白质分子溶液的热力学性质. 结果表明,对于稀溶液来说,溶液的吉布斯函数随蛋白质浓度的增加而降低,蛋白质分子化学势随其浓度增加而升高. 还分析了蛋白质分子链长及温度对溶液吉布斯函数和蛋白质分子化学势的影响. 并且计算讨论了几种第一类抗冻蛋白的化学势.     

Mei Adiabatic Invariants Induced by Perturbation of Mei Symmetry for Nonholonomic Controllable Mechanical Systems

Two types of Mei adiabatic invariants induced by perturbation of Mei symmetry for nonholonomic controllable mechanical systems are reported. Criterion and restriction equations determining Mei symmetry after being disturbed of the system are established. Form and existence condition of Mei adiabatic invariants are obtained.     

基于动态线性模型的中国狭义货币需求及缺口的贝叶斯估计

本文应用动态线性模型研究我国的狭义货币需求,利用贝叶斯吉布斯抽样方法估计模型的参数和方差,获得了潜在货币需求趋势和货币缺口,对我国的货币供给进行分析并获得一些有益结论,对于央行更好地实施货币管理,保持经济平稳发展有积极意义。     

Characterizing neural activities evoked by manual acupuncture through spiking irregularity measures

The neural system characterizes information in external stimulations by different spiking patterns. In order to examine how neural spiking patterns are related to acupuncture manipulations, experiments are designed in such a way that different types of manual acupuncture （MA） manipulations are taken at the ＇Zusanli＇ point of experimental rats, and the induced electrical signals in the spinal dorsal root ganglion are detected and recorded. The interspike interval （ISI） statistical histogram is fitted by the gamma distribution, which has two parameters： one is the time-dependent firing rate and the other is a shape parameter characterizing the spiking irregularities. The shape parameter is the measure of spiking irregularities and can be used to identify the type of MA manipulations. The coefficient of variation is mostly used to measure the spike time irregularity, but it overestimates the irregularity in the case of pronounced firing rate changes. However, experiments show that each acupuncture manipulation will lead to changes in the firing rate. So we combine four relatively rate- independent measures to study the irregularity of spike trains evoked by different types of MA manipulations. Results suggest that the MA manipulations possess unique spiking statistics and characteristics and can be distinguished according to the spiking irregularity measures. These studies have offered new insights into the coding processes and information transfer of acupuncture.     

生长温度和结构参数对InGaAs／GaAs量子阱光学特性的影响

研究了不同生长温度下制备的In0.15Ga0.85As/GaAs应变量子阱的PL谱,结果表明,生长温度越高,In偏析和In-Ga互混越严重,同时,导致更多的In脱附,PL谱发光峰蓝移。对不同In含量的和不同InGaAs厚度的InGaAs/GaAs量子阱进行PL谱测试,分析表明In含量<0.2,生长温度低于560℃时,In含量和InGaAs层量子阱的厚度对In偏析、脱附和In-Ga互混基本没有影响。     

基于吉布斯弯曲界面相平衡判据的开尔文方程推导

对两种界面热力学处理方法(古根海姆法与吉布斯法)进行了介绍。采用吉布斯界面热力学方法建立了存在界面相时两相平衡的热力学判据,并以此为基础提出了一种新的开尔文方程推导方法。