γ-(2,3-环氧丙氧基)丙基三甲氧基硅烷的合成

以烯丙基缩水甘油醚与三甲氧基硅烷为原料,并以目标产物γ-(2,3-环氧丙氧基)丙基三甲氧基硅烷(KH 560)为溶剂,使用自制催化剂,原料三甲氧基硅烷和烯丙基缩水甘油醚通过逆流在塔中进行气液接触反应制备KH 560,降低了两种原料的副反应和β加成副产物的量,提高了KH 560收率。该工艺路线简单,对设备要求低,投入较少,可优化KH 560的工业化生产。     

Synthesis of HTPB based PU-PS IPN membrane for pervaporation recovery of butanol

Hydroxyl terminated polybutadiene(HTPB) based polyurethane(PU)-polystyrene(PS) interpenetrating polymer network(IPN) was prepared and characterized by FTIR, TGA, WCA, swelling experiments, and SEM. The IPN was used for pervaporation(PV) recovery of butanol. Both the permeation flux and separation factor increased with feed temperature, and both water and butanol fluxes increased with feed concentration while no obvious effect of concentration on separation factor was found. Through the formation of IPN structure, the total flux of HTPB based PU increased greatly with the decrease of separation factor. At the feed temperature of 60 °C, the IPN membrane obtained a total flux of 613.3 g/m~2 h with a separation factor of 6.15.     

Preparation of γ-methacryloxypropyl Trimethoxy Silane Cross-linked PDMS Membrane for Pervaporation Recovery of Butanol

The present study aimed to improve the pervaporation(PV) performances of polydimethylsiloxane(PDMS) membranes by using special cross-linkers. The γ-methacryloxypropyl trimethoxy silane(KH-570) cross-linked PDMS membranes were fabricated and characterized by FTIR, TGA, WCA, DSC, SEM, and swelling properties. Experimental results showed that the separation factor of the membrane increased slightly with the feed temperature whereas permeate flux increased. Butanol flux increased slowly with the feed concentration while the water flux decreased. The overall result indicated that the separation factor decreased slowly with the feed concentration. The membrane, with a thickness of 55 μm, showed a total flux of 308.4 g/m~2h with a separation factor of 26.8 at 70 ℃, and butanol permeability reached 11.13×10~5 Barrer with a membrane selectivity of 56.0.     

基于光纤光栅的钢轨受力状态监测技术研究

钢轨状态监测对列车的安全运营具有重要意义.基于光纤光栅传感技术,采用钢轨三维梁模型对轴向应变、竖向和横向曲率进行测量.与传统一维测量模型相比,该方法可以同时测量钢轨竖、横向曲率和轴向力.通过实验室静态轴向加载试验对比了一维和三维模型,验证了三维模型的有效性与优势.     

多面体低聚硅倍半氧烷的研究进展

综述了多面体低聚硅倍半氧烷（POSS）的结构特性和合成方法，重点介绍了同取代基、单官能度、双官能度、多官能度四类POSS的合成方法，比较了各种合成方法的优劣，展望了POKS合成研究的发展方向。     

加强管理 办好研究生课程进修班

加强管理办好研究生课程进修班中南工业大学廖俊规开展在职人员申请学位工作，是满足四化建设对高层次人才的需求的重要途径。为了给更多的在职人员申请学位创造条件，我校根据中华人民共和国学位条例暂行实施办法及国务院学位委员会关于授予具有研究生毕业同等学力的在职...     

综合电子干扰对编队对地攻击作战效能的影响

建立了编队对地攻击作战效能和战损模型,重点分析了编队综合电子干扰（雷达干扰、通信干扰、光电干扰）对敌防空预警系统、指挥引导系统以及武器制导系统的探测概率、引导概率和跟踪概率的影响,进一步指出了其对编队战损及作战效能的影响。     

300kt/a硫磺制酸装置混酸器技术改造

0引言川化股份有限公司制酸厂300kt/a硫磺制酸装置于2009年7月建成投产,干吸工段循环酸槽(VV008)的混酸器采用管式混酸器。常用的管式混酸器具有结构简单、操作稳定、安装和维修方便等特点。但实际生产应用中,300kt/a硫磺制酸装置的混酸器先后出现了加水管溶胀变形并脱落、主酸槽上部壳体和出酸管多处严重腐蚀等现     

培养当代大学生创造性思维方式的障碍分析

本文主要分析了当代大学生思维方式的现状，提出了妨碍培养当代大学生创新性思维方式的四大障碍，即：逻辑性较强与创造性不足；绝对化有余而辩证性不足；封闭性过强与联通性太弱；理论性较强而实践性较差。     

精密陀螺全站仪在城市综合地下管廊中的应用研究

本文对精密陀螺全站仪在城市综合地下管廊中的应用进行研究和分析,以供参考。