查询词典 selectivity

Zirconium phosphate has recently been demonstrated as an excellent sorbent for heavy metals due to its high selectivity, high thermal stability, and absolute insolubility in water.

磷酸锆最近被证明是一种优良的吸附剂重金属，由于它具有选择性高，热稳定性较高，绝对溶解在水中。

Application : This series can be widely used in the communication systems of Intermediate Frequency for improving selectivity and anti-jamming capacity of signals.

用途：可广泛应用于中频通讯系统中，提高信号的选择性和抗干扰能力。

Based on this definition, it is concluded that community public products are a kind of special social intervenient products between pure public products and pure private products. Therefore, they have the characteristics of partly-non-exclusiveness, limitedly-non- rivalry, selectivity, and openness.

通过对社区公共产品概念的界定，我们知道，社区公共产品是介于纯公共产品和纯私人产品之间的一种特殊社会产品，它具有局部的非排他性、有限的非竞争性、可选择性和外部性的特征。

In this method, a feature vector with desirable characteristics including spatial locality, frequency and orientation selectivity is obtained by DT-CWT. Then, the dimension of the vector is linearly reduced by ONPP, thus effectively preserving the intrinsic neighborhood geometry of the vector and the global geometry.

先通过DT－CWT得到具有空间、频率以及方向特征的人脸特征表示，然后使用ONPP对特征向量进行线性降维，有效地保持了数据的局部与全局的几何特征，最后进行识别测试。

The main content of this paper as follows: The acidic strength, reaction temperature, reaction time of Chlorine-aluminate Ionic Liquids with different structure of cation on the activity of transalkylation of MN with TeMB and the selectivity of 2,6-DMN were studied. The optimum reaction condition was obtained: the molar fraction of AlCl_3 is 0.71, molar ratio of 2-MN and TeMB is 1, the amount of ionic liquid is 32wt%, reaction temperature is 20℃and reaction time is 8h using X-xAlCl_3 and X-xAlCl_3 as catalysts; the optimum reaction time is shortened 6h using Et_3NHCl-xAlCl_3 as catalyst.

本文主要研究了以下内容：分别考察了不同阳离子结构的氯铝酸盐类离子液体的酸强度、反应温度、反应时间等因素对MN和TeMB转移烷基化的催化反应活性和2，6-DMN选择性的影响，优化得到适宜的反应条件为：以X-xAlCl_3和X-xAlCl_3为催化剂时，AlCl_3的摩尔分数x=0.71，2-MN和TeMB摩尔比为1∶1，离子液体用量为32wt％，反应温度为20℃，反应时间为8h；以Et_3NHCl-xAlCl_3为催化剂时，反应时间缩短到6h。

The catalyst on calcination temperature of 400℃ had the highest conversion of isobutylene and the catalyst on calcination temperature of 500℃ had the highest selectivity of methacrolein .

焙烧温度为400℃的催化剂异丁烯的转化率最高，焙烧温度为500℃的催化剂甲基丙烯醛的选择性最高。

Result showed that conversion of isobutylene reached 80% and selectivity of diisobutylene was 90% when reacted at 180 oC with mass airspeed of 3h-1 by self-made R2 catalyst.

利用分子筛催化异丁烯合成二聚异丁烯，在固定床反应器中考查了温度、空速对异丁烯齐聚反应的影响。

To understand the molecular basis of the high selectivity of the inhibitor and the mechanism of feedback inhibition, we determined the crystal structure of LiCMSC (C-terminal regulatory domain of LiCMS) in complex with isoleucine, and performed a biochemical study of the inhibition of LiCMS using mutagenesis and kinetic methods.

丁建平和赵国屏课题组合作，运用结构生物学和生物化学的方法分别研究了 CMS 的催化结构域与其底物丙酮酸、乙酰辅酶 A 、金属辅基的四元复合物的晶体结构，和 CMS 的调节结构域与反馈抑制剂异亮氨酸的复合物的晶体结构，以及全酶与这些配体相互结合的动力学性质。

An appropriate and short reaction time is the key to obtain high yield of the targets and low selectivity of the trans-trans isomer.

适当短的反应时间是获得高的主产物收率和低的反-反异构体选择性的关键。

The result shows that this catalyst has a high catalytic activity and a good selectivity to isomerization of longifolene.

结果表明，该催化剂对长叶烯的异构化反应有很高的催化活性和较好的选择性。

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％。