查询词典 selectivity

The experimental results showed that: 1 cylindrical catalyst prepared by extrusion was used in mixed butene oligomerization, whose conversion and dimer selectivity wre seperately as high as 41% and 52%.

实验结果表明：1挤出成型法制得的圆柱状催化剂催化混合丁烯齐聚反应的转化率和二聚物选择性分别高达41%和52%。

The effects of temperature, feed flow rate and O2/C4H8 ratio on butene conversion and selectivity for butadiene were systematically studied.

系统地考察了反应温度、进料量、氧／烃比对丁烯转化率及丁二烯选择性的影响。

Under suitable conditions, the conversion of α-pinene reached 98% and the selectivity of camphene reached 63%.

在适宜的工艺条件下，α-蒎烯的转化率为98%以上，莰烯的选择性达到63%。

The result showed that whether the trace water was toomuch or too less,the conversion rate of pinene would decrease,while the changeof the selectivity of camphene was not obvious.

结果表明：反应体系中的微量水过多或者过少，都会降低蒎烯转化率，但对莰烯的选择性影响不大。

The experimental results showed that the catalyst had better catalytic activity and selectivity. The main product of the isomerization reaction was camphene, and the byproducts were limonene, terpinolene and tricyclene etc.

该催化剂具有较好的催化活性和选择性，异构化反应的主产物是莰烯，副产物是苎烯、异松油烯、三环烯等。

By means of GC, GC-MS, GC-IR, IR, H1-NMR,the reaction products were investigated and the results showed that there are camphene, limoneneN terpinolene, Me a -fenchyl ether, Me -terpinyl ether, Me bornyl ether and Me isobornyl ether containing in the products,and the content of the main product Me a -terpinyl ether is up to 42.5%,the selectivity is 44.7%.

采用GC、GC-IR、GC-MS、IR、H~1-NMR等对反应产物进行定量和定性分析，结果表明：微波辐射下α-蒎烯与甲醇的反应产物含有莰烯、柠檬烯、α-小茴香甲醚、异松油烯、异菠基甲醚、菠基甲醚、α-松油基甲醚等，在较好的工艺条件下，主产物α-松油基甲醚的得率为42.5％，选择性为44.7％。

By means of GC, GC-MS, GC-IR, the reaction products were investigated and the results showed that there are triylene, camphene, limonene, p-cymene, terpinolene -terpinene,-terpinene,-fenchyl formate, linalyl formate, terpinyl formate, bornyl formate and isobornyl formate containing in the products,and linalyl formate was first discovered in addition reaction of a -pinene and formic acid .The content of the main product terpinyl formate is up to 60.4%,the selectivity is 64.5%.

采用GC、GC-IR、GC-MS等对反应产物进行定量和定性分析，结果表明：微波辐射下α-蒎烯与甲酸的反应产物含有三环烯、莰烯、对-伞花烃、α-松油烯、γ-松油烯、柠檬烯、异松油烯、甲酸葑醇酯、甲酸异龙脑酯、甲酸龙脑酯、甲酸芳樟酯、甲酸松油酯。

It combines the advantages of high efficiency of capillary electrophoresis with high selectivity of high performance liquid chromatography.

毛细管电色谱结合了毛细管电泳的高分离效率和高效液相色谱的高选择性，因而在这几年受到了越来越多的关注。

The results indicated that the use of such membrane could achieve satisfactory separation effects (condensate of high alcoholicity and rich flavoring substances was obtained, membrane-flowing rate: ethanol＞esters except ethyl lactate＞aldehyde＞other alcohol＞water), the membrane had good selectivity to ethanol and ethyl caproate had good membrane-flowing rate and membrane-passing percentage, however, ethyl lactate, aldehyde and methanol had poor mambrane-passing percentage with heavy loss during membrane-passing.

结果表明，渗透汽化膜有良好的分离性能，可得到高酒精度、香味物质富集的冷凝液；过膜速率：乙醇＞酯类＞醛类＞其他醇类＞水；膜对乙醇选择性好，己酸乙酯的过膜率及过膜速率高；乳酸乙酯、醛类及甲醇过膜率较小、损失量较大；渗透汽化膜用于白酒的香气成分分离有良好的工业应用前景。

Using B3LYP method, the mechanism of NaBH_4 reducing carbonyl function and its selectivity was studied.

利用B3LYP方法，对硼氢化钠还原羰基的机理以及选择性进行了研究，计算得到的ee值跟实验值非常接近。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。