查询词典 selectivity

The investigation indicates that the Shalagang antimony has osculatingrelationship with the Structure but has no selectivity with the host rock: The ore bodyis controlled by the fault zone, which insert into it as a nervation;The host rockincludes chert, carbonaceous slaty rock, altered diorite , altered diabase and so on. Theore-forming epoch of Shalagang antimony is obviously later than era of the host rock,so it is concluded that the Shalagang antimony maybe formed in the late Himalayan.

研究表明，沙拉岗锑矿床与构造关系密切，而对容矿岩石类型无选择性：矿体主要受控于断裂及层间破碎带；主要容矿岩石有硅质岩、碳质板岩、强蚀变中基性火山岩和蚀变辉绿岩等，并以硅质岩为主；矿床成矿时代明显滞后于容矿岩石时代，据此推断沙拉岗锑矿床可能形成于喜山晚期。

It was found that the nitration reaction has a high ortho-selectivity, and a high conversion could be achieved.

结果发现在此微乳体系中，苯酚的硝化具有明显的邻位选择性，而苯酚氧化等副反应明显减少，实现了高产率。

Therefore, NLM and NCM both showed higher activity and selectivity than the Ni/MgO catalyst NM.

所得催化剂NLM、NCM具有较大比表面和较小镍晶粒度，以NCM中镍物种的还原性能改善尤为明显。

As an important target of frequency synthesizer design, phase noise determines system's sensitivity and selectivity whose design is being the emphasis as well as nodus at all times.

它作为频率合成器的重要指标，决定了系统的灵敏度和选择性能，一直是设计者的难点和重点。

Methane, oxygen and H_2O molecules are activated, ionized and dissociated into active particles such as CH_3~+, O~-, H_2O~+, CH_3, CH_2, CH, H,OH and O, by nonelastic collision with high energy electrons. The particles react with each other in the reactor to synthesize chemically products including gaseous oxy-hydrocarbons.We study the rule of reaction by changing electrical parameter, gas flow etc. Study the conversion of methane, selectivity of gaseous hydrocarbons and yield of methanol under different reaction condition.

针对常规甲烷催化转化和氧化偶联制备含氧化合物的问题，遵循国际化学科学研究前沿"绿色化学"原则，采用自然界存在丰富的CH_4、H_2O和O_2为原料，在绿色友好的常温大气压无任何催化剂的条件下，采用强电场电离放电加速电子及其激励气体分子的极端物理手段，在反应腔体内进行无任何环境污染的非平衡等离子体化学反应，将气体分子激发、电离、离解成CH_4~+、CH_3~+、CH_4~·、H_2O~+、H_2O~·、O_2~+、O(~1D)等活性粒子，生成气态烃及含氧碳氢化合物，整个反应过程实现零污染、零副产品。

One way to speed up an LC run is to increase the temperature, and this article discusses the benefits of elevated temperatures, including sensitivity improvements, selectivity changes and simultaneous analysis of polar and nonpolar analytics using temperature gradients.

一种提高分析速度的方法是提高温度，本文讨论了升高温度的优势，包括灵敏度改善，选择性变化，以及采用温度梯度同时分析极性和非极性分析物。

The condensation reaction,in which the yield of intermediate product after refining process was more than 90%,used iso-butylaldehyde and formaldehyde as materials,Et 3N as catalyst.The hydrogenation,in which the conversion of hydroxypivaldehyde and selectivity of NPG were respectively 99% and 95%,used Cu-ZnO as catalyst,and ethanol as solute,meanwhile in the hydrogenation,the impurity in material could also ...

缩合反应采用异丁醛和甲醛为原料，三乙胺为催化剂，在 60℃左右反应，缩合产物经减压蒸馏和结晶、干燥，得到收率为 90 %以上的中间体羟基戊醛；加氢反应采用自制的Cu -ZnO催化剂，乙醇为溶剂，在 15 0℃将HPA加氢生成新戊二醇，HPA转化率为 99%，新戊二醇收率在 95 %以上，而且HPA缩合反应的副产物在加氢反应中也转化为新戊二醇。

The catalyst, palladium supported with chitosan condensated with salicylaldehyde, was studied in hydrogenation ofα-octene, nitrobenzene, 4-nitrophenol and m-dinitrobenzene, it was active and good selectivity forα-octene and nitrobenzene, when the activation time is 90 min, the catalyst showed the best hydrogenation active.

壳聚糖缩水杨醛负载不同比例PdCl_2的催化剂对α-辛烯、硝基苯、4-硝基酚和间二硝基苯的催化性能进行了研究，结果表明该催化剂活化90 min时加氢催化活性最好，对α-辛烯，硝基苯的催化选择性在催化5 h时达到了100%。

It was showed that the imprinted polymer has good affinity and marked selectivity for the template molecule, and can be used to determine the trace amount of TBZ in biological and environemtal samples in an off-line mode. This methodology may be important for accurate investigation and determination of TBZ levels in the environmental and biological matrices.

研究结果表明，戊唑醇分子印迹聚合物对模板分子具有很强的亲和性和显著的选择性，可离线富集各种环境和生物样品中痕量的戊唑醇，在戊唑醇检测中具有实际的应用价值。

The selectivity and the yield can reach to 99% under the optimum conditions.

在最佳反应条件下，糠醇的选择性和收率达到99%以上。

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％。