气相渗透法测定数均分子量的仪器常数问题研究

讨论了蒸气压渗透计仪器常数的分子量依赖性问题．通过对某些已知分子量化合物的温差信号随时间变化的研究，提出了测量四个低分子一种改进的ＶＰＯ信号的测量手续和数据处理方式，可以得到更为准确的数均分子量．     

硫化物的冷分子吸收光谱法测定

本文研究了用冷分子吸收光谱法测定硫化物的方法。并用断续进样法测定了湖水、河水及大气中Ｓ＾２－的含量，结果令人满意。     

CALCULATION OF VAPOR PRESSURES FROM MODEL FRAGRANCE EMULSIONS DURING EVAPORATION

The vapor pressure data from previous publications of a model fragrance emulsion system consisting of water, an aromatic fragrance phenethyl alcohol, an aliphatic one limonene, and a nonionic surfactant Laureth 4, were used to calculate the variation in vapor pressures of both fragrances and water during free evaporation. The evaporation path in a three-dimensional four-component phase diagram was estimated from the vapor pressures.

The results showed as expected that the high note fragrance compound evaporates first followed by water and the low note one. Unexpectedly, it was found that vapor pressure of low note fragrance, phenethyl alcohol, is significantly increased during evaporation.     

主动式冷却系统微型化发展现状

常规的制冷系统在一些特殊场合下不能用作消除热害的理想解决方案.得益于微系统工艺和微尺度传热传质理论的不断完善,以蒸气压缩系统、吸收式系统和热电系统为代表的主动冷却系统在微型化和轻量化方面取得显著进展.文中基于国内外最新文献分别介绍了这三种主动冷却系统的优、缺点及发展现状,通过实例对比说明蒸气压缩系统具有较大发展潜力,就...     

Fabrication of High-Performance Dispersion Compensating Fiber by Plasma Chemical Vapor Deposition

In this paper, the dispersion compensating fiber (DCF) with figure of merit larger than 200 at 1550 nm has been fabricated by plasma chemical vapor deposition (PCVD). PCVD allows for a more precise and fine control of the refractive index. In addition, as the efficiency of PCVD is relatively much higher, DCFs can be fabricated faster with less material, which will reduce their cost.     

Phase Behavior and Vapor Pressures of the Pyrene + 9,10-Dibromoanthracene System

The present work concerns the thermochemical and vapor pressure behavior of the pyrene + 9,10-dibromoanthracene system. The phase diagram of the system has been studied using the thaw melt method and the results show the formation of non-eutectic multiphase mixtures. The temperatures of crystallization, and enthalpies of fusion and crystallization of the system were determined by differential scanning calorimetry. The system behavior can be divided into 5 regions. The X-ray diffraction results also indicated the existence of multiple phase characteristics. The solid-vapor equilibrium studies showed that for mixtures with high mole fractions of pyrene, two different preferred states exist that determine the vapor pressure. For those mixtures with moderate and low mole fractions of pyrene, only one preferred state exists that determines vapor pressure behavior. It was also demonstrated that the vapor pressure of the mixtures is independent of the mixture preparation technique.