衡枣高速公路永州互通设置方案选择

结合所在地区的实际情况，将技术，经济和环境等因素综合考虑，并考虑到有利于当地长远发展规划的实际要求，对322国道衡阳至枣木铺高速公路永州互通设计方案进行了介绍，比选结果表明，文中介绍了方案Ⅱ是最佳的互通设置方案。     

互通式立交中T形平面交叉设计探讨

高速公路一般通过互通与被交叉公路的连接 ,大多以T形平面交叉来实现。在设计中 ,往往仅注意互通式立交本身而忽视平面交叉的设计。本文详细地探讨了平面交叉口渠化设计 ,提出在平面交叉设计中 ,应先着眼于交通量 ,速度与交通构成的研究。     

公路互通式立交方案的模糊综合评价

在对公路互通式立交设计、施工及使用进行综合分析的基础上，建立了立交方案综合评价指标系和多级模糊综合评价数学模型。提出一套比较科学的适用于公路互通式立交方案比选的多级模糊综合评价的方法。该方法具有较好的适用性。     

水南高速西津互通立交绿地喷灌工程管理

介绍广西水任—南宁高速公路西津互通立交绿地喷灌工程的施工情况,对施工技术的供水系统、管网系统、喷头、电磁阀和控制器、系统调试进行研究,并总结了施工过程的几点经验。     

Interchange reaction kinetics and sequence distribution of liquid crystalline poly(ethylene terephthalate-co-2(3)-chloro-1,4-phenylene terephthalate)

Liquid crystalline (LC) poly(ethylene terephthalate-co-2(3)-chloro-1,4-phenylene terephthalate) [copoly(ET/CPT)] was prepared using poly(ethylene terephthalate) (PET) as a flexible spacer, terephthalic acid (TPA), and chlorohydroquinone diacetate (CHQDA). All reactions involved in the copolymerization were investigated using some model compounds: TPA was used for acidolysis, diphenylethyl terephthalate (DPET) for interchange reaction between PET chains, and di-o-chlorophenyl terephthalate (DOCT) and di-m-chlorophenyl terephthalate (DMCT) for interchange reaction between PET and rigid rodlike segments. Activation energies obtained for the acidolysis of PET with TPA and for interchange reaction of PET with DPET, DOCT, and DMCT were 19.8 kcal/mole, 26.5 kcal/mole, 60.2 kcal/mole, and 45.9 kcal/mole, respectively. This result supports that the copolymerization proceeds through the acidolysis of PET with TPA first and subsequent polycondensation between carboxyl end group and CHQDA or acetyl end group, which is formed from the reaction of CHQDA and TPA. Also, it was found that ester-interchange reaction can be influenced by the steric hindrance. Copoly(ET/CPT)s obtained had ethylene acetate end groups formed from acetic acid and hydroxy ethylene end groups and showed almost the random sequence distribution for all compositions.