查询词典 ethylene

Advances in ethylene selective trimerization catalysts, especially composition, activity and cost of trimerization catalysts and their overall selectivity to 1-hexene.

对乙烯选择性三聚反应进行了论述，着重分析了催化剂的组成、活性、成本和1-己烯的总选择性，并展望了烯烃选择性齐聚反应的发展。

The different effect of support on trimerization catalyst activity was due to the hindrance of the ligand imposed to the active site, which might block off ethylene coupling, coordination, and insertion.

负载化对两种催化剂活性的影响程度不同，是由于R基为-C_(12)H_(25)时催化剂本身的位阻基团比较大，催化剂负载化加剧了位阻对乙烯配位、络合及插入的影响。

However, in S8/MAO catalytic system, the polymer was produced as main product and the activity and the selectivity of ethylene trimerization was very low.

然而，对于S8／MAO催化体系，却不能选择性催化乙烯三聚，主要生成高聚产物。

The combinative effect of the fluorine substitute and the bridging unit can make complex 2 as a highly active and selective catalyst for ethylene trimerization.

氟原子效应和桥碳原子上大取代基效应两者结合在一起，可以使络合物2成为一种高活性和高选择性的乙烯三聚催化剂。

Due to the hemilability of the heteroaromatic functionalized cyclopentadienyl ligand, these complexes showed considerable activity and high selectivity for ethylene trimerization to 1-hexene.

由于这类芳香杂环-茂配体具有Hemilabile特性，因此，此类络合物显示了一定的乙烯三聚活性和高的三聚选择性。

By comparing the catalytic behavior of S3/MAO and S8/MAO, a conclusion could be drawn that the coordination of the sulfur atom to the titanium center of the active species was essential for ethylene trimerization.

通过比较S3与S8不同的催化性能，可以认为，硫原子对钛活性中心可能存在配位，而这一配位对乙烯三聚反应起重要作用。

In the second chapater, first-principles electronic structure calculations were performed to examine the reaction pathway and corresponding activation free energies for alkaline hydrolysis of representative phosphodiesters, including dimethyl phosphate, trimethylene phosphate, ethylene phosphate, and a simplified model of adenosine 3\', 5\'-phosphate.

第二章中主要应用量子化学从头计算方法研究了四种磷酸二酯—二甲基磷酸酯，乙撑磷酸酯，TMP阴离子及cAMP的模型化合物的碱性水解反应途径，并估算了各个反应的能垒和自由能能垒。

ABSTRACTS In this thesis the diagnostic expert system theory and methodology are studied, with the emphasis on the fuzzy knowledge representation, uncertain reasoning and diagnostic knowledge acquisition. The applications of neural networks in the fault diagnosis for rotating machinery are also studied. A fuzzy diagnostic expert system for turbocompressor called ETHYLENE is implemented.

本文以大型旋转机械为研究对象，着重研究了旋转机械故障诊断专家系统的理论和方法，包括模糊知识表达、不确定性推理与诊断知识获取等问题；本文还研究了神经网络模型及其在旋转机械故障诊断中的应用；并研制了一个透平压缩机组模糊诊断专家系统。

RESULTS Twelve hours were spent in the sterilization to the undurable orthopedic instruments when the ethylene oxide was used, and 10h were needed using the 2%GTA.

结果 不耐热骨科手术器械采用环氧乙烷灭菌法进行消毒每次需要12h；戊二醛浸泡灭菌每次需要10h；低温过氧化氢等离子灭菌法消毒每次需要55rain。

Since this method probably killed the unoccluded spores, the strips for the moist- and dry-heat experiments were first treated, at 54 C, 40% RH, with 1,200 mg of ethylene oxide for 1 hr.

由于这种方法可杀死未封闭的孢子，因此进行湿热和干热试验的纸带均在54C、40% RH下用1，200 mg环氧乙烷首先处理了1小时。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。