查询词典 ethene

The cracking furnace piling of ethene facilities has been completed. 0.3 million/year LLDPE and 0.3 million/year HDPE piling, stake prefabricating, the construction within the plant and the preparation ofthe road construction within the plant and the preparation of drain and pipes are under construction.

乙烯装置的裂解炉打桩已完成。30万吨／年LLDPE装置和30万吨／年HDPE装置的打桩和桩预制以及厂区内道路的施工及雨排、地管施工的准备工作正在加紧进行。

From the potential energy profile, it can be predicted that, the dominant channel of this reaction consists of three steps: the two reactants first form a three-membered ring intermediate (INT1) through a barrier-free exothermic reaction of 19.2 kJ/mol; three-membered ring intermediate (INT1) isomerizes to a four-membered ring silylene(P2) via the transition state (TS2) with an energy barrier of 22.8 kJ/mol; four-membered ring silylene(P2) further reacts with ethene(R2) to form a silicic bis-heterocyclic compound (P3), which is also a barrier-free exothermic reaction of 132.2 kJ/mol.

用CCSD//MP2/6-31G*方法研究了单重态二甲基亚烷基硅烯与乙烯生成硅杂双环化合物环加成反应的机理，根据该反应的势能面可以预言，该反应的主反应通道有三步组成：第一步是两反应物（R1， R2）首先生成了一三元环中间体（INT1），它是一无势垒的放热反应，放出的能量为19.2 kJ/mol；第二步是三元环中间体(INT1)经过渡态TS2异构化为了四元环硅烯（P2），其势垒为22.8 kJ/mol；第三步是四元环硅烯（P2）进一步与乙烯(R2)反应生成了硅杂双环化合物（P3），该反应也是一无势垒的放热反应，放出的能量为132.2 kJ/mol。

When the doses are between 10 and 1 000 kGy,the main light hydrocarbons produced by radiation degradation of N,N-diethyl hydroxylamine are methane, ethane, ethene, propane and n -butane.

结果表明：当吸收剂量为10～1000kGy时，N，N 二乙基羟胺水溶液辐解产生的气态烃类主要有甲烷、乙烷、乙烯、丙烷和正丁烷。

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 %)。

The results showed that wind precooling could inhibit the respiration intensity of plum fruit, while the two precooling methods had little effect on the formation of ethene. The firmness and soluble solid content decreased on storage. The precooling methods had little effect on the firmness of fruit, but wind precooling could relieve the decrease of to a certian extent. The two varieties of plum fruit both became rotten in the late period of storage, the rot with ice precooling was higher than wind.

结果表明，风预冷可抑制'黑宝石'和'安哥诺'李果实的呼吸速率，但这2种预冷方式对果实乙烯释放量的影响不明显；随着贮藏时间的延长，'黑宝石'和'安哥诺'李果实的硬度和SSC含量均下降，这2种预冷方式汁果实硬度的影响不大，但风预冷可在一定程度上缓解果实SSC含量的下降；在贮藏后期，2品种李果实均表现出腐烂症状，冰水预冷果实的腐烂症状明显高于风预冷。

The results showed that wind precooling could inhibit the respiration intensity of plum fruit, while the two precooling methods had little effect on the formation of ethene. The firmness and soluble solid content decreased on storage. The precooling methods had little effect on the firmness of fruit, but wind precooling could relieve the decrease ofto a certian extent. The two varieties of plum fruit both became rotten in the late period of storage, the rot with ice precooling was higher than wind.

结果表明，风预冷可抑制'黑宝石'和'安哥诺'李果实的呼吸速率，但这2种预冷方式对果实乙烯释放量的影响不明显；随着贮藏时间的延长，'黑宝石'和'安哥诺'李果实的硬度和SSC含量均下降，这2种预冷方式对果实硬度的影响不大，但风预冷可在一定程度上缓解果实SSC含量的下降；在贮藏后期，2品种李果实均表现出腐烂症状，冰水预冷果实的腐烂症状明显高于风预冷。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。