查询词典 substituted

The substituted half-sandwich titaconece with bulky alkoxyl group [CpTiC1〓 or CpTi 〓] or indene ring can not be fluorinated by BF〓·Et〓O under the selected condition, but still coordinates with the BF〓, this coordination then enhances the steric effect that stabilizes the precursor and hinders the reduction of the Ti to the Ti species, reflected in the decrease in polymerization activity.

但是这个转化受主催化剂分子的空间位阻和聚合反应温度的影响，当主催化剂为大位阻的烷氧基取代茂钛络合物或茚钛络合物时，在一般的聚合温度下BF〓不能对它们进行氟化，但可以和其中的OR配位，这种配位进一步加剧了空间位阻，从而阻碍了活性中心的形成，导致催化活性的下降。

Based on matrix analysis of motor and general theory of alternating current machines,3-phases induction synchronous motor is substituted for symmetrical 2-phases motor with even gas,then the equation for instantaneous torque of induction synchronous motor step motion is obtained.

文中采用了电机的矩阵分析方法，根据交流电机统一理论，将三相感应式同步电机用等效的具有均匀气隙的两相电机来代替，得出了感应式同步电机步进运动的瞬时转矩表达式。

A catalyst composition for the polymerization of propylene comprising one or more Ziegler-Natta procatalyst compositions comprising one or more transition metal compounds and one or more esters of aromatic dicarboxylic acid internal electron donors; one or more aluminum containing cocatalysts; a selectivity control agent comprising at least one silicon containing compound containing at least one C1-10 alkoxy group bonded to a silicon atom, and one or more activity limiting agent compounds comprising one or more aliphatic or cycloaliphatic carboxylic acids; alkyl-, cycloalkyl- or alkyl-ester derivatives thereof; or inertly substituted derivatives of the foregoing.

一种用于丙烯聚合的催化剂组合物，所述催化剂组合物包括：一种或多种齐格勒-纳塔主催化剂组合物，该主催化剂组合物包括一种或多种过渡金属化合物和一种或多种芳族二羧酸酯内部电子给体；一种或多种包含铝的助催化剂；选择性控制剂，该选择性控制剂包括至少一种包含硅的化合物，该化合物包括至少一种与硅原子连接的C 1-10 烷氧基；和一种或多种活性限制剂化合物，该活性限制剂包括一种或多种脂族或脂环族的单或聚羧酸类、其烷基-、环烷基-或烷基-衍生物、或上述惰性取代的衍生物。

Aim To prepare lower degree of substituted starch acetate with cassava starch as material, acetic anhydride as acetylation reagent, sodium hydroxide as catalyst and sodium sulfate as gelatinization inhibiter.

目的 以木薯淀粉为原料，醋酸酐为乙酰化试剂，NaOH为催化剂，Na2SO4为膨胀抑制剂，制备了低取代度木薯淀粉醋酸酯。

It has an advantage of innocuity, non-residual and non-pollution which is not substituted by any general way. The performance of the sterilization and modification is very good.

具有无毒、无害、无残留、无环境污染的其他传统方法无可替代的优点，辐照加工过程可控制，灭菌、改性效果极佳。

According to analyses of the existing problems in the evaluation of agent of government investment project ,combining with the characters of the substituted construction system of the government invested project and the project management,a performance evaluation index system of the agent of government invested project was constructed,fdlowing the basic principles of the index settlement.

通过对当前政府投资项目代建单位绩效考评存在问题的分析，结合政府投资项目代建制特点及项目管理特点，遵循指标设置的基本原则，构建了政府投资项目代建单位绩效考评指标体系，引入层次分析法、模糊综合评价法以及数据包络法相结合的AFD综合评价模型，并列举了应用算例。

And some say that at the very last second, Artemis substituted the girl's body with a deer's and Iphigenia went off to become a minor goddess.

另一些人说，在最后第二，女神取代了鹿和丽江山去了，成为一个小女神女孩的身体。

When the regular television program didn't come on, a jerry-built program was substituted at the last minute.

原来节目被取消之后，最后一刻临时拼凑了一个节目作为替代。

Rubber and PVC tubes substituted for the jugular vein and carotid artery, and an electric pump became the heart.

橡胶和PVC管颈替代了静脉和颈动脉。用一个小电动抽水机代替心脏。

Therefore, when a corn-based kibble is substituted, an improvement is possible.

因此，当一个以玉黍蜀为基础的磨成粗粒的食物被替换的时候，进步是可能的。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！