选择性

Selective hydrogenation ; Nickel catalyst ; FCC light gasoline ; Diene

选择性加氢；镍催化剂；催化裂化轻汽油；二烯烃

The factors which influence holography diffraction efficiency, the angle selectivity of volume holography and wavelength bandwidth are analyzed with the coupled wave theory.

利用耦合波理论分析了影响体积全息图的衍射效率的因素、体积全息图的角度选择性以及波长带宽等方面。

Diketoreductase is a new class of enzyme, and compared to other oxidoreductase, the unique property is that it can be reduced diketone substrate to corresponding dihydroxy alcohol with high stereoselectivity.

双羰基还原酶（Diketoreductase，DKR）是一类全新的酶，与其他的氧化还原酶相比，其独特之处在于它能够同时还原两个羰基还原成羟基，并有高度的立体选择性。

Next year will continue to have alternative dilate, but speed will be compared 2008 slow down.

明年将继续有选择性的扩张，但速度将比2008年减缓。

The results show that the ionic liquid Et〓NHCl-AlCl〓 is an effective catalyst for the dimerization.

研究的结果表明，Et〓NHCl-AlCl〓是二聚反应的高效催化剂，反应无需加热且在无溶剂条件下得到的主要产物为环状二聚物1，1，3-三甲基-3-苯基茚满，反应在80℃、进行5min即可达到转化率100％、茚满的选择性为97.3％。

The catalytic activity of this new resin catalyst in the isobutene oligomerization was measured in detail, it exhibited good catalytic activity and excellent isobutene dimerization selectivity.

在异丁烯的低聚反应中，对这种新型树脂催化剂的催化活性进行了细致的研究，磺化聚醚碸酮树脂催化剂在反应中表现出了很好的催化活性和优良的二聚选择性。

The most possible reason for the production of it is the disproportionation of dimethylamine.

调整Cu-Ni比例或加入Zn、Mg之所以能调整催化剂的选择性，主要是由于催化剂组份的调整影响了NiO的还原程度。

But larger amount of Ni in the catalysts could cause the adsorption of dimethylamine in the state to break N-C bond to lead the disproportionation of dimethylamine and lower the selectivity of the catalysts.

但加入Ni量较大时会使二甲胺在催化剂表面有涉及N-C断裂的吸附状态，从而催化二甲胺的歧化，使催化剂的选择性下降。

Reaction curves of 180 and 60 mmol/L diol 1 concentrations ensured the high reaction rate and enantioselectivity.

分别考察二醇1浓度为60和180mmol/L的反应情况，均具有较高的选择性和反应速度。

The reaction conversion and selectivity can be increased effectively by using multi-stage hydrogenation process and controlling H 2/ diolefin s molar ratio.

以该催化剂为基础开发的长链双烯多段选择性加氢工艺，在很宽的温度、压力、空速范围内都可达到很好的结果，严格控制氢气与双烯烃摩尔比，可有效提高反应的转化率和选择

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷