查询词典 selectivity

Ideal catalysts are selected. Main factors influencing the selectivity of cis-pinane and the content of pinane hydroperoxide are investigated. Optimum conditions are decided.

选择了较理想的催化剂，考察了催化反应的某些因素对氢化反应中顺式蒎烷选择性、氧化反应中蒎烷氢过氧化物含量的影响，确定了适宜的工艺条件。

The role of gold is to activate molecular oxygen and promote the decomposition of cyclohexyl hydroperoxide to target products, accounting for the high activity and selectivity of gold catalysts in cyclohexane oxidation.

金在环己烷氧化过程中的作用主要表现为活化分子氧，同时促进中间产物环己基过氧化氢分解为目标产物，从而表现出较高的活性和选择性。

The selectivity is close to 100% and the highest conversion of IB is 92% on optimum conditions.

在最佳条件下处理的分子筛，最高异丁烯转化率达到92％。

At last, after all these researches, ILs were finally proved to promote the reaction on the improvement of catalytical activity and selectivity.

这一效果的产生，是整个离子液体助催化剂共同产生的，并不是单独的阴离子和阳离子所能的达到的效果。

Distribution coefficients, separation factors and selectivity were evaluated for the immiscibility region, and their connections with temperature and the concentration of aromatic hydrocarbon were studied respectively.

Othmer-Tobias和Bachman方程对三元体系相平衡实验数据关联的结果表明实验数据具有较好的一致可靠性。2、N-甲酰吗啉抽提性能研究。

Medium to high conversion and selectivity were achieved with easy separation of the products from the ionic liquids due to their immiscibility.

反应具有适中至高的转化率和选择性，依据底物的不同，反应结束后可以和离子液体系分层，便于产物分离。氯铝酸离子液体具有一定的重复使用性

A catalyst composition for the polymerization of propylene comprising one or more Ziegler-Natta procatalyst compositions comprising one or more transition metal compounds and one or more esters of aromatic dicarboxylic acid internal electron donors; one or more aluminum containing cocatalysts; a selectivity control agent comprising at least one silicon containing compound containing at least one C1-10 alkoxy group bonded to a silicon atom, and one or more activity limiting agent compounds comprising one or more aliphatic or cycloaliphatic carboxylic acids; alkyl-, cycloalkyl- or alkyl-ester derivatives thereof; or inertly substituted derivatives of the foregoing.

一种用于丙烯聚合的催化剂组合物，所述催化剂组合物包括：一种或多种齐格勒-纳塔主催化剂组合物，该主催化剂组合物包括一种或多种过渡金属化合物和一种或多种芳族二羧酸酯内部电子给体；一种或多种包含铝的助催化剂；选择性控制剂，该选择性控制剂包括至少一种包含硅的化合物，该化合物包括至少一种与硅原子连接的C 1-10 烷氧基；和一种或多种活性限制剂化合物，该活性限制剂包括一种或多种脂族或脂环族的单或聚羧酸类、其烷基-、环烷基-或烷基-衍生物、或上述惰性取代的衍生物。

This technology has theadvantages of simplicity, accuracy, inexpensiveness, sensitivity and well-selectivity,and also can be compatible with DNA chips technology.

DNA电化学传感技术是一门涉及生物化学、电化学、医学及电子学等领域的交叉学科，具有简单、可靠、价廉、灵敏和选择性好等优点，并且与DNA生物芯片技术兼容。

Compared with the performance of the glucose sensor based on blank carbon paste electrodes, our sensor had larger response current and better selectivity, but inferior detection limit.

和基于空白碳糊电极的葡萄糖传感器各性能指标相比后发现，虽然最小检测值有所欠缺，但电流响应更大，且选择特性明显优于后者。

Recently open-chain marocyclic ligand and then lanthanide complexes have attracted much attention mainly because the ligands have the unique molecular structures: changeable chain, inflexibly terminal group and high selectivity and coordination to lanthanide ions.

一个优良的发光器件必须具备以下几个条件：配体对金属离子有较高的选择识别性能；配体含有共轭发色团有利于能量从配体向中心离子转移；配合物具有相对较高的动力学和热力学稳定性。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。