查询词典 selectivity

The effects of the preparation and reaction conditions on the conversion and isomerization selectivity of n-heptane were studied carefully.

详细讨论了催化剂的制备条件和反应条件的改变对正庚烷的转化率和异构化选择性的影响。

The higher selectivity to isopentenes, however, was regarded as a consequence of both insufficient active sites for further hydrogenation of isopentenes to isopentane and lower electronic interaction between Pd and the alumina surface.

而较高的选择性则可归因於没有足够的钯活性中心可供异戊烯进一步氢化生成异戊烷以及钯金属和氧化铝间较低的电子效应所致。

The selected prepared catalyst for isomerization of light oilis used under the reaction conditions of 260°C, 2.0MPa, WHSV=1.0h-1 , H2/Hydrocarbon molarration 4.0, n-pentane conversion rate is 62.17%,isopentane yield is 57.01%(isomerization rate is58.00%), isopentane selectivity is 91.60%, liquid product yield is 94.84%.

在 T=260°C，P= 2.0MPa ，WHSV= 1.0h-1 ，H/C5= 4.0 时，正戊烷转化率为 62.17%，异戊烷收率为 57.01%(产率为58.00%)，选择性为 91.60%，液体产物收率为 94.84%。

Pyrolyzing the kenaf core s directly,a new kind of absorbent with superior selectivity and high sorption capacity to oil was obtained.

以红麻杆为原料，经热解处理制备出选择性亲油和高吸油量的吸油材料。

Pyrolyzing the kenaf cores at 250℃~500℃ directly, a newkind of absorbent with superior selectivity and high sorption capacity to oil was obtained.

以红麻杆为原料，经250℃-500℃热解，制备出了选择性亲油和高吸油量的吸油材料。

The catalyst prepared by mixed support (MgO+ kieselguhr) had the decrease in selectivity to CHN for support's acidity, but the change is very little.

采用混合载体浸渍的催化剂，由于硅藻土的酸性作用，环己酮的选择性略有降低，但对催化剂的整体活性影响不大。

It was found that Pd-Co/active carbon catalyst was the optimal catalyst, and Pd-Co/γ-Al2O3 was also good, but silica and kieselguhr were not proper carriers for the object reaction, because of their stronger surface acidity, which could result in the formation of polymer, jammed the micro pores of catalyst, and then resulted in its deactivation. Addition of Bi, Ce and Cu promoters could not improve the activity of catalyst, but La and Ba promoter could enhance the activity of catalyst apparently, and the Co was the best promoter, especially Co was impregnate in advance. It was attributed to that the pre-impregnated Co may occupy the micro pores of active carbon, and cover some bad functional groups on the surface of catalyst, so that the active and selectivity of catalyst could be enhanced obviously.

研究结果表明，Pd-Co/活性炭催化剂是目标转移加氢反应的最适宜催化剂，Pd-Co/γ-Al203效果也较好，而硅胶和硅藻土由于表面酸性较强，容易造成生成聚合物而堵塞催化剂微孔、使催化剂迅速失活；此外，添加Bi、Ce、Cu等助剂时对活性并无改善作用，而添加La和Ba助剂时可使Pd的催化活性有所提高，效果最好的是Co助剂，尤其是先浸渍Co的Pd-Co/C催化剂，原因是Co占据了活性炭的微孔、覆盖了某些对目标反应不利的官能团，使其活性和选择性都有较大幅度的提高。

Shape memory alloy with thermoelastic martensite metallography transform represents absolute shape memory effect, for matrix metallography lattice orientation selectivity in reverse metallography transform.

具有热弹性马氏体相变的形状记忆合金，在逆相变中必定会选择相变前母相的晶格位向，表现出完全的形状记忆效应。

Its hypotoxicity and high selectivity against AChE make become the ideal leading compound in developing new AChE inhibitors.

土震素B具有低毒性、高选择性等优点，是发展新的AChE抑制剂理想的先导化合物。

The part analyzes profit and free-rent period through discussing probability of house in-and-out quantity in profit risk, proposes the risk management measures of cash supervisory mechanism and selectivity financing in capital gap risk, putts forward the measures of liquidity gap forecast, improving credit and adopting different free-rent period in house liquidity risk, and introduces the credit swap to transfer leaseholder default risk.

本部分主要分析了房屋置业中心的四个风险，分别是收益风险，通过引入给定时间段内的房屋存贷量的概率分布分析了房屋置业中心的收益风险和空租期的确定；资金缺口风险，并提出现金监理机制和选择性融资的风险预防措施；房屋流动风险，提出流动缺口预测、提升自身形象、采用不同空租期的风险管理措施；承租人的支付风险，主要引入了信用掉期合同来转移这种风险。

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％。