查询词典 selectivity

ZSM-5 zeolite catalyst is one with selectivity preferring normal paraffins to branched ones.

考察了ZSM-5型分子筛催化剂的择形裂解反应动力学过程。

Utilis had significant selectivity for microhabitats of parasitizing. The parasitizing rate in valley microhabitat (31.7%) was the highest, followed by woodland of pine tree (28.1%), orchard (26.1%) and wasteland (13.5%). The sequence of parasitizing rate implied that the tendency of parasitizing rate increases with the increase of water content of soils in the microhabitats.

结果表明，泽兰实蝇在不同微生境中对紫茎泽兰寄生率的高低依次为沟谷地31.7%，马尾松林地28.1%，果园26.1%和撂荒地13.5%，这一顺序反映了泽兰实蝇的寄生率有随微生境中土壤含水量升高而增加的趋势。

The satisfactory resolution and selectivity of the polymerized column still remain after conditioned at 250 ℃ for 6 h.

该聚合色谱柱在250 ℃下老化6 h后仍具有良好的分离能力和选择性。

Moreover, the sensor shows better selectivity and rapider response-recovery characteristics.

并有较快的响应恢复时间和较好的选择性。

In range of 300℃～900℃, all the transition metal oxide catalysts could get high ammonia conversion, during the initial stages of the reaction, the SO〓 conversion is relatively low since the catalysts have not been sulfureted, but it increases gradually and attain constant with rising temperature and time continuance,〓 is better than other catalysts in reactivity and elemental sulfur selectivity; XRD indicates that, in the SO〓-SCR process, stable transition metal sulfide is generated which is very important to SO〓 reduction and transition metal sulfide probably is the active phase of catalyst, further the reduction of SO〓 by H〓 to H〓S is the limiting step of all process, then the activity is somewhat related to its lattice oxygen yet not so notable; XPS indicates that little sulfur on surface exists as S〓 in sulfate, showing that TiO〓 could restrain the generation of sulfate.

对于过渡金属氧化物催化剂的研究发现，在300℃～900℃范围内，不同的催化剂均可获得很高的NH〓转化率，反应初期由于催化剂还未硫化，所以SO〓的转化率较低，随着温度升高和反应时间的延续，SO〓的转化率逐渐升高并达到了稳定值；七种过渡金属氧化物中，以〓对于NH〓还原SO〓反应的活性和选择性最好；XRD结果表明在NH〓-SO〓反应后生成了稳定的硫化物相，硫化物对SO〓的还原过程具有重要作用，催化剂的活性相可能是过渡金属硫化物，而且在硫化物催化剂上进行的H〓还原SO〓生成H〓S的反应是整个过程的速率控制步骤，所以催化剂的活性与其自身的晶格氧的氧化还原能力有一定的联系，但关系不明显；XPS结果表明催化剂表面的硫大部分以过渡金属硫化物的形式存在，只生成少量的S〓，说明TiO〓催化剂能够较好的抑制硫酸盐的生成。

The synthetic product was proved by IR and MS. The translation ratio of nitrobenzene was about 90%by titrating amino group value. The selectivity of p-aminophenol was 80%.

合成产品通过IR、MS确认其结构，并通过滴定氨基值计算出硝基苯的转化率为90％左右，产品的选择性达80％。

In order to improve size selection for shrimps of multi-codends beam trawls fishing in offshore of the East China Sea,experiments of several sea trials for size selectivity of codends with different mesh configuration, including diamond mesh, square mesh and turned through 90° mesh,have been carried out and catch data were collected by comparative fishing method.

选择性模型对哈氏仿对虾和葛氏长臂虾渔获数据的拟合结果显示，选择性模型具有较好的拟合性，但存在航次间差异；不同网目结构网囊的选择性曲线模型都可简化为Logistic曲线；对于哈氏仿对虾，相比菱形网目网囊，方形网目和转向网目网囊的L50较大，而SR较小(菱形和方形网目之间差异显著，菱形和转向网目之间差异不显著)；对于葛氏长臂虾，方形网目和转向网目网囊的L50较大(菱形和方形网目之间差异显著，菱形和转向网目之间差异不显著)。

However, the ratio of the unsaturated and saturated fatty acid amide is relatively stable in downcore indicating that there is no selectivity between those two types of fatty acid amides during diagenesis processes, including biological, chemical and physical degradation. For this reason, we suggested that the depositional environment in Qarhan paleolake was relatively aerobic during the organic component deposition.

另一方面，不饱和脂肪酸酰胺与饱和脂肪酸酰胺的相对量的比值在剖面上并没有呈现明显下降的趋势，说明各种生物、物理及化学作用对饱和与不饱和脂肪酸酰胺的降解过程不存在明显的选择性，指示了有机质在沉积过程中处于一个偏氧化的环境。

However, Iron polyhaloporphyrin catalyzing alkane selective auto-oxidation may have a real future for its using O〓 only and high selectivity for alcohol.

多卤代卟啉铁仅使用O〓就可催化烷烃选择性氧化，醇选择性高，可能有实用前景。

It was found that the Beckmann rearrangement of cyclohexanone oxime could be performed smoothly in the catalytic media consisting of room temperature ionic liquid and acidic phosphorated compounds, and excellent conversion and selectivity were achieved under mild conditions without any additional organic solvents.

发现酸性含磷化合物，如五氯化磷等在离子液体中可以高效地实现环己酮肟重排制己内酰胺，具有不需另加有机溶剂，选择性高等优点。

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