Thermodynamic properties of refrigerants R11, R12, R13, R14, R22, R23, R113, R114, R500 and R502

The publication presents a set of equations and constants for calculating thermodynamic properties of refrigerants. State equation, equation of saturated vapor pressure, equation of liquid volume, equation of specific heat capacity, enthalpy and entropy for R11, R12, R13, R14, R22, R23, R113, R114, R500 and R502 are presented. High accuracy of results was achieved in comparing with ASHRAE tables. All equations are in SI units.     

手性分子2, 3-丁二醇的旋光拉曼光谱研究

本文从拉曼峰和旋光拉曼峰出发,通过键极化率和微分键极化率分析研究(2R, 3R)-2, 3-丁二醇. 通过分子C₁和C₂两种点群的优化结构,获得不依赖于这两种结构的结果 和有关这个手性系统物理图像的丰富信息.对分子拉曼键极化率分析,得出在拉曼弛豫过程中, 电荷主要从外围流向骨架结构.对分子微分键极化率的分析,显示在不对称C原子和与其相联系的H原子 两侧化学键, C-O和C-CH₃的微分键极化率的符号正好相反,意味着这个分子具有相当好的手性 不对称性质.对比对称和反对称的键极化率、微分键极化率,本文得到这样的结论: 对于(特别是键伸缩的)键极化率,(大体上是)对称的大于反对称的; 而对于微分键极化率则是反对称的大于对称的. 关键词： 旋光拉曼 键极化率 微分键极化率 2,3-丁二醇     

Etude R.P.E. des anions paramagnétiques SnH4 - et SiF4 -

The E.S.R. spectra of the radicals SnH₄ ^- and SiF₄ ^- are described, and their spectral parameters compared with those of PH₄ and PF₄ respectively.