查询词典 closure

For the synthesis of NHC precursors, there are also several routes: condensation of glyoxal, amines and paraformaldehyde; alkylation of imidazole or monosubstituted imidazole with alkyl halide; annulation of ortho esters and 1,2-diamines; ring closure of hydrazines or amides with acetic anhydride; reduction of thiones with Na/K in THF.

关于N-杂环卡宾前体的合成途径主要有：乙二醛、伯胺和多聚甲醛的缩合反应；卤代烷与咪唑及其取代咪唑的烷基化反应；原甲酸酯与1，2-二胺的成环反应；肼或酰胺与酸酐的环化反应；用Na/K对环硫脲化合物的还原反应。

The conversion of the cyclobutanes to the corresponding annulation products was achieved by a reaction sequence of [elimination of HCl in the cyclobutanes-4 electron electrocyclic ring opening-6 electron electrocyclic ring closure-elimination of another HCl molecule] .

这些环丁烷产物向增环产物的转化是经一个[脱除－分子HCl得环丁烯－环丁烯电环开环为丁二烯－6电子电环闭环－脱除另一分子HCl]这一连续反应进行的。

Whether it is case or carton closure, poly, paper or plastic, it will provide the right tank, hoses and applicator.

无论是案件或纸盒封闭，聚，纸张或塑料，它将提供正确的坦克，软管和喷头。

Under UBM examination, appositional angle closure was found to be more common under dark room conditions than under light conditions.

浅前房患者，应用UBM检查，在暗室状态较明室状态下，房角更多发生相贴关闭。

Objective To assess the efficacy and safety of two kinds of arterial suture-mediated closure devices in patients after coronary arteriography and percutaneous coronary intervention.

目的 评价并比较Angioseal和Perclose两种血管闭合器在经皮冠状动脉造影及介入治疗中应用的有效性和安全性。

A stage of arteriosclerosis involving closure of blood vessels.

血管阻塞的一种动脉硬化。

Starclose (n=286): Starclose utilized a small flexible nitinol clip that gave circumferential extravascular closure of the femoral arteriotomy site after CAG or PCI.

Starclose闭合器组(n=286)：冠脉造影或介入术后直接利用一个环形可弯曲的小镍钛合金闭合夹从血管外对穿刺口周围进行闭合。

If we consider the integers with ordinary multiplication we have closure , associativity, and identity element.

如果我们考虑整数集且用通常的乘法，我们有封闭性，可结合性，和一个单位元。

In Section 6, we set up the closure axioms of poset matroids. which is one of our main results in this thesis.

在第6节，我们建立了偏序集拟阵的闭包公理，这是本文主要定理之一。

If the shaft seal bad back, there will be large number of resin powder leaked, each class should be pressed for several Pan-gen still leakage phenomenon not only affects the sanitation, and increase the volume of maintenance and therefore a need to use The system forms a seal 4 gear is reasonable Screw conveyor is the use of motor driven rotary screw, the passage of materials in order to achieve the purpose of transportation machinery, it can level, tilt or vertical transmission, a simple structure, small cross sectional area, sealing, and easy to operate, easy maintenance, facilitate closure transportation and other advantages.

如果轴后端密封不好，就会有大量树脂粉泄漏，每个班要压好几次盘根，仍有泄漏现象，既影响了环境卫生，又增加了维修量，因此急需选用一种适用于该系统的密封形式 4传动装置的合理性螺旋输送机是利用电机带动螺旋回转，推移物料以实现输送目的的机械，它能水平、倾斜或垂直输送，具有结构简单、横截面积小、密封性好、操作方便、维修容易、便于封闭运输等优点。

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。