以下为句子列表：
英文: Abstract: Polyphenylacetylenes were synthesized by ［Rn(nbd)Cl］2 and WCl6/Ph4Sn catalyst systems in N2 at room temperature.Polymers with high yield and high molecular weight were obtained.Their structures were characterized by UV,IR,NMR and GPC,respectivel
中文: 文摘:使用有机金属铑、金属钨/四苯基锡催化剂体系聚合苯乙炔，分别获得了高产率和高分子量的聚苯乙炔.使用UV，IR，NMR，GPC等分别对聚合物结构进行了表征.采用不同波长的激发光对聚合物荧光性能进行研究，详细分析了聚合物结构与荧光性能之间的关系.研究结果发现，不同聚合物结构对聚合物荧光性能产生很大影响，规整性高的聚合物，将有较高的发光量子效率；聚合物规整性差，将可能导致多个荧光发光结构点，其荧光强度降低.聚合物荧光光谱研究将对某些共轭聚合物结构的规整性分析提供一些有用的信息.
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英文: Abstract: The mathematical model that describes the reaction kinetics and molecular weight distribution for the polycondensation reaction process is developed by methods of reaction extent and generation function,in which an industrial process of poly(eth
中文: 文摘:以一个工业化聚酯生产过程为例，将反应度法和生成函数作为工具，建立了描述此类缩聚反应过程的反应动力学及其分子量分布的数学模型，并介绍了求解数学模型的方法。
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英文: Any of a group of water-soluble colloidal carbohydrates of high molecular weight found in ripe fruits, such as apples, plums, and grapefruit, and used to jell various foods, drugs, and cosmetics.
中文: 果胶任一种用于凝结各种食物、药品和化装品的高分子量且溶于水的胶质碳水化合物，存在于如苹果、杏和葡萄等成熟的水果中
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英文: Based on the polymerization reaction mechanism of PET, the model includes all main reactions and major side reactions with measured operational variables as its input and polymerization degree (DP), average molecular weight and parameters of molecular wei
中文: 模型从聚合反应机理出发，考虑了所有的主反应和主要的副反应，以实测的工艺操作参数为输入，以各反应釜、特别是终端产品的聚合度、平均相对分子质量及相对分子质量分布参数为输出。
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英文: Because the hydrogen has the special kind in quality, its density is small, the molecular weight is small, so the common stop valve can't satisfy it requests, and, the hydrogen belong to the combustible and explosive gas, once leak happened, will exist hi
中文: 摘要由于氢气性质特殊，其密度小，分子量小，所以普通截止阀不能满足它的使用要求，而且氢气属于易燃易爆气体，一旦发生洩漏，会存在很大的隐患。
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