Objective To study improved synthetic method of 1-[ ( 4-chlorophenyl ) phenylmethyl ]-piperazine, the intermediate of cetirizine hydrochloride.

The paper has reviewed the market development and related uses of piperazine.

本文首先简要介绍了无水哌嗪的市场发展情况以及相关用途.

A gang of 23 teen-age computer hackers has done significant damage to Chase Manhattan Bank records.

一群23 岁 的电脑骇客们对大通银行的记录造成了巨大破坏.

I was particularly struck by a group of teen-age girls going through their basic skills.

给我印象最深的是一群10多 岁 的练基本功的女孩子.

In the teen-age years the concept of happiness changes.

到了青少年时期,幸福观变了.

Every street had its teen-age gang in those days.

在那个时候,每条街的孩子都有帮.

However, the D-optimality does not consider the departure of the true model from the assumed model.

而当真实模型与假设模型有偏离时, D - 最优设计就会失去其有效性.

Finally, a heuristic search for the optimality would be performed under the constraints.

最后, 根据约束条件搜寻最优解.

Optimality conditions for vector optimization problem to attain strictly efficient solutions are considered in the paper.

本文研究向量优化问题在严有效解意义下的最优性条件.

Finally, optimality necessary and sufficient conditions for nonlinear convex semidefinite programming are proved.

并给出了非线性半定规划的最优性必要和充分条件.

A new way is carried out for design and optimality of the horn.

为超声变幅杆的设计和优化提供了新的途径.

The optimality conditions for multiobjective semi-infinite programming with semilocally convex functions are given.

研究半局部凸函数在多目标半无限规划下的最优性.

The conclusion of equivalence between the optimality function and the one-order optimality condition is concluded.

论述了最优性函数与一 阶 最优性条件的等价性.

Optimality-Behavior analyzed in terms analogous to economic decision making.

最优 - 行为的角度分析了类似的经济决策.

The necessary conditions for optimality were derived calculus of variations.

利用变分法原理,推导出满足优化问题的必要条件.

The optimality method are introduced on slope cutting project in the paper.

将优化理论引入到削坡方案的选择上.

Results of performance evaluation showed that this lubricant possesses extreme-pressure, anti-rust , antifoam and fire resistant properties.

润滑剂由实验室性能评定的结果.表明该润滑剂具有极压性 、 防锈 性 、 抗泡性和难燃性.

Under certain circumstances, antifoam additives can be abnormally depleted.

在某些情况下, 抗泡沫添加剂会无缘无故的损失.

The selection panel for the national squad ought to promptly integrate new promising players.

国家队的选拔小组应当迅速引入有潜力的新队员。

By the time he turned 32, Rees had already made 23 appearances for England's national team.

在他32岁之前，里斯已经为英格兰国家队出场23次。

Clad in the national team's colors, he scarcely demonstrated his complete capabilities.

尽管身着国家队队服，他几乎没能展示出全部才能。