查询词典 selectivity

However, like other cytotoxic agent, taxol lacks of selectivity and contributes to serious side effects.

然而，由於紫杉醇缺乏对癌细胞的专一性，在治疗癌症的同时也会伤害到其他的正常组织。

The super acid SO〓/ZrO〓, due to its strong acidity, favores the dealkylation and disproportionatin of 4-TBC or/and DTBC, preventing the increase of the selectivity for 4-TBC.

而固体超强酸SO〓/ZrO〓由于酸性较强，易于发生4-叔丁基邻苯二酚和3，5-二叔丁基邻苯二酚的脱烷基反应和4-叔丁基邻苯二酚的歧化反应，因此不利于提高4-叔丁基邻苯二酚的产率。

The efficiency and selectivity of oxygen delignification are improved.

摘 要：对麦草浆H2O2强化中浓氧脱木素的主要影响因素进行了研究，得出了H2O2强化氧脱木素的优化工艺条件，并进行了OpQP全无氯漂白。

Flotation reagent ; desulphuration and deashing ; selectivity ; coal pyrite

浮选药剂；脱硫降灰；选择性；煤系黄铁矿

From the beginning of 1980s, Non-asbestos Compressed Fiber Sheet wasdeveloped by some advanced countries as substitute of Compressed AsbestosFiber Sheet.It has been widely used as seal material in many different fieldsbecause of its good processing method and no harm to environment andpeople. Such material has diversity and devisable ingredient and performancesince non-asbestos fiber has wide selectivity and combination, which make peopleto pay close attention and take researches on it.

压缩非石棉纤维橡胶板(Non-asbestos Compressed Fiber Sheet，CFS)是八十年代初以美国为首的工业发达国家为替代传统压缩石棉纤维橡胶板(Compressed Asbestos Fiber，CAF)而开发研制的一类新型非石棉纤维增强密封材料，它不仅具有较好的加工工艺性，而且还具有对环境和人体的无害性，因此被广泛用于各行业密封的需要。

The chelating fibers with diethanolamine group or diethylamine group present great adsorption capacity , high adsorption rate as well as good selectivity for Au3+ ion.

结果表明，含二乙胺基和二乙醇胺基的螯合纤维对金离子的吸附量较大，而且吸附快、对金的选择性好，还能将所吸附的金离子还原成单质金

After analyzing the reaction mechanism through literature, we think the reaction from diethanolamine to iminodiatic salt is composed of two steps—reaction from alcohol to aldehyde and the disproportionation reaction of the aldehyde. The selectivity, conversion, rate of this reaction are mainly attributed to the capability of this catalyst.

通过查阅文献资料，分析了反应机理，认为二乙醇胺脱氢生成酸是由两步反应组成─醇脱氢生成醛与醛的歧化，催化剂的性能是影响反应转化率、选择性及反应速度的主要因素，确定了采用沉淀法制备Cu/ZrO2做催化剂。

From the point view of product distribution, conversion of dimethyl ether and energy consumption, with RCD plasma DME conversion was higher and was hardly affected by the residence time of dimethyl ether, and hydrogen, carbon monoxide and unsaturated hydrocarbons with RCD plasma were more than those with DBD plasma.There was no liquid product with RCD plasma, but the liquid product obtained with DBD plasma consisted of aldehydes, alcohols and methoxy-containing organic compounds, for instance, formaldehyde, methyl alcohol, dimethoxy ethane and so on.Moreover, most compositions of liquid product were methoxy-containing compounds, and the liquid product selectivity was as high as 32.23%.However, energy consumption for the reaction with DBD plasma was more than that with RCD plasma.

从产物分布、转化率及能耗上看，利用RCD所获得的二甲醚的转化率高，几乎不受二甲醚停留时间的影响，且氢气、一氧化碳和不饱和烃的含量大，几乎没有液相产物，而利用DBD能获得较多的液相产物，包括一些醇、醛和含有甲氧基的有机化合物，如甲醛、甲醇和二甲氧基乙烷，且大部分组成都是含有甲氧基的化合物，液相产物的选择性高达32.23％，但是能耗较大。

It's found that the aromatic dinitro compounds can be monoreduced to nitroanilines in high selectivity, aromatic nitro compound s and muti.

本文旨在探索一种具有先进性和创造性的催化方法，利用一氧化碳在温和的条件下高选择性地还原芳香硝基化合物制备芳胺。

It's found that the aromatic dinitro compounds can be monoreduced to nitroanilines in high selectivity, aromatic nitro compounds and muti-cycle aromatic nitro compounds can be quantitively reduced to the corresponding amine by selenium catalyst with CO/H2O in polar aprotic solvents under atmospheric pressure using medical inorganic bases as co-catalysts.

在实验的基础上提出了对硒催化CO/H_2O还原芳香硝基化合物机理的一些粗浅认识。

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％。