乙烯

In this dissertation, preparation of polysubstituted ethene and heterocyclic compounds based on 2-hydroxyalkyl phenyl selenides andα-phenylselenopropionic acid reagents were further investigated as follow: Firstly, O-ethyl-O-vinyl phosphonates were prepared in a one-pot, two-step transformation by Mitsunobu reaction of 2-hydroxyalkyl phenyl selenides with monoethyl esters of phosphonic acid in the presence of diethyl azodicarboxylate and triphenyl phosphine (PPh3) followed by oxidation-eliminatio...

中文摘要：本文主要进一步探索了2-羟基烷基苯基硒醚、α-苯硒基丙酸试剂在制备多取代乙烯和杂环化合物反应中的应用，具体研究内容和结果如下：一、在偶氮二羧酸乙酯和三苯膦(PPh3)存在下，苯基-2-羟基烷基硒醚和O-乙基膦酸单酯发生Mitsunobu反应，无需分离和纯化反应中间体，直接使用30 %的双氧水进行氧化-消除反应，提供了&两步、一锅&合成O-乙基-O-乙烯基膦酸酯的新方法，该方法反应条件温和，操作简便，产物收率良好(76-82 %)。

Chocolate brown fog corrosion inhibitor could be prepared by using of waste materials with organic amine being the main contents from production of pharmaceutical industry intermediate 1;8diazabicyclo\hendecene7,built with surfactant compound nonyl phenol polyoxyethylene ether and aliphatic alcohol polyoxyethylene ether.

利用制药工业中间体1，8-二氮杂二环[5，4，0]十一烯-7生产中的废料，与复合表面活性剂壬基酚聚氧乙烯醚、脂肪醇聚氧乙烯醚等，复配得到棕褐色缓蚀抑雾剂。

Tris-(1-aziridinyl)- phosphine oxide and 2-[bis-(2-chloroethyl)-amino]-tetrahydro-1, 3, 2-oxazaphospholidine-2-oxide(Ⅲ, B-518) possess inhibitory action against a variety of animal tumours and have been used clinically. Recently, bis-(1-aziridinyl)-phosphinyl carbamic acid ethyl ester(Ⅱ, AB-100) was found to possess significant activity with low toxicity on experimental animal tumours.

双(2-氯乙基)氨基磷酰二氯与乙烯亚胺在脱水苯或对氧六环中并在三乙胺的存在下进行缩合，生成N，N-双(2-氯乙基)-N′，N-二乙烯基-磷酰胺；与双巯基或双氨基化合物作用，则生成相应的环状磷酰胺、磷酰胺酯以及磷酰胺硫代酯氮芥类化合物。

In the subatmospheric pressure system,the preparation of tetrafluoroethylene monomer by pyrolyzing waste polytetrafluoroethylene was studied.

在负压系统中，采用真空热裂解法裂解废聚四氟乙烯塑料，对四氟乙烯单体生产工艺进行研究。

The purpose of this work is to synthesize hydrophilic photosensitive polymers which possess high photosensitivity and at the same time high water resistance to fulfill the requirements of making screen printing plate for manufacturing electronic circuit board and thick film for integrated circuit and so on.

本文用重氮树脂为光敏剂，用聚乙烯醇和聚醋酸乙烯酯为成膜剂制作了感光性树脂，研究了聚醋酸乙烯酯对提高感光性树脂的耐水性的作用以及其对体系感度的影响。

The purpose of this work is to synthesize hydrophilic photosensitive polymers which possess high photosensitivity and at the same time high water resistance to fulfill the requirements of making screen printing plate for manufacturing electronic circuit board and thick film for integrated circuit and so on.

用重氮树脂为光敏剂、聚乙烯醇和聚醋酸乙烯酯为成膜剂制作了感光性树脂，研究了聚醋酸乙烯酯对提高感光性树脂的耐水性的作用以及其对体系感度的影响。

TiO〓/K-M supported Ag/SiO〓 composite ceramic membrane tubes have been prepared and used as a membrane reactor for selective separation of C〓H〓 during the catalytic reaction process of CO〓 partially oxidating C〓H〓. By removing C〓H〓 produced in the catalytic reaction, thermodynamic balance of the reaction is upset and some side reactions from C〓H〓 are avoided, thus the conversion rate of C〓H〓 and the selectivity to C〓H〓 are effectively increased.

本研究设计、制备了硅藻土—莫来石陶瓷管负载的Ag/SiO〓复合膜，并将其应用于二氧化碳部分氧化乙烷催化反应过程中产物乙烯的选择性分离，有效地提高了催化反应的反应物乙烷转化率和产物乙烯选择性。

PTFE is a typical low-surface-energy material: The CA for water on a smooth PTFE film is about 121.61.88, and for diesel oil it is 11.21.68, that is, PTFE is intrinsically hydrophobic and oleophilic.

聚四氟乙烯是一种典型的低表面能材料：核证机关水在光滑的PTFE膜约121.6？1.88，和柴油是11.2？1.68，也就是说，聚四氟乙烯在本质上是疏水性和亲油性。

The transparent and heat-insulating EVA/antimony-doped tin dioxide interlayers used for laminated glass were prepared by compression molding after adding Nano ATO with transparency and infrared reflection function to the EVA through extrusion blending. The heat-insulation performance of the prepared EVA/ATO interlayers was also characterized, and the effects of Nano-ATO content on the tensile property, the optical property, the thermal stability and the adhesive strength to glass of the prepared EVA/ATO materials were investigated.

通过挤出共混法将透明且具有红外反射功能的纳米锑掺杂二氧化锡添加到乙烯–乙酸乙烯酯共聚物中，并经热压成型制备了夹层玻璃用EVA/ATO透明隔热中间膜；表征了EVA/ATO中间膜的隔热性能，并考察了ATO用量对EVA/ATO材料的拉伸性能、光学性能、热稳定性及其与玻璃的黏合性能的影响。

Main physiological and biochemical parameters were studied in different mature stage and during ripening and senescence of tomato and strawberry fruits at pink stage after harvest under low and normal temperature.

中文题名Ca2+、CaM及其目标酶与乙烯诱导番茄和草莓果实成熟衰老关系的研究副题名外文题名 Studies of relationship between Ca2+，CaM，its target enzymes and ethylene inducing maturation，ripening and senescence of tomato and strawberry fruits 论文作者顾采琴导师席玙芳李广敏学科专业食品科学研究领域\研究方向学位级别博士学位授予单位浙江大学学位授予日期2003 论文页码总数117页关键词果实植物生理学番茄草莓乙烯馆藏号BSLW /2003 /Q945 /34 研究了跃变型果实番茄和非跃型果实草莓不同成熟度以及粉红期两种果实采后置于低温和常温下后熟衰老过程中与成熟衰老有关的主要生理生化指标的变化。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。