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The asymmetric aldol reaction is one of the most important methods of forming carbon-carbon bonds.

不对称羟醛缩合反应是有机合成中立体选择性地形成碳碳键的最重要方法之一。

It is true that he used the old patterns all his life with dogged conservatism (another Sansculotte characteristic, by the way); but the imposed on them such an overwhelming charge of human energy and passion, including that highest passion which accompanies thought, and reduces the passion of the physical appetites to mere animalism, that he not only played Old Harry with their symmetry but often made it impossible to notice that there was any pattern at all beneath the storm of emotion.

不错,他一生非常保守地(顺便说一句,这也是激进共和主义者的特点)使用着旧的乐式;但是他加给它们以惊人的活力和激情,包括产生于思想高度的那种最高的激情,使得产生于感觉的激情显得仅仅是感官上的享受,于是他不仅打乱了旧乐式的对称,而且常常使人听不出在感情的风暴之下竟还有什么样式存在着了。

We studied the effect of the coupling strength between the emission dipole and the electric field of the cavity on the emission intensity for the first time, and found that when the emitter located at the antinode of the electric field of the cavity the PL intensity reached its maximum, while at the node of the electric field the PL intensity reached its minimum.

通过理论推导确定了金属穿透深度和反射相移的表达式,并设计腔长为λ/2的对称金属镜腔结构,通过改变金属的厚度得出不同厚度金属的穿透深度,与我们给出的公式的结果基本一致,从而为精确地设计微腔器件提供了理论指导。

The multi-equilibrium may be in existence combined with model,consequently,the game result of both sides is not simply depending on the degree of information symmetry,which makes the army exhume and use the information in reason and in high effect,then enhance the benefit of the weapon equipment repair.

结合具体实例,分析了在性态复杂的信息结构下,可能存在多种均衡,使得双方的博弈结果并不简单地依赖信息对称的程度,有利于军方合理、高效地发掘和利用信息,以提高武器装备修理的效益。

Integrating the research findings in the field of sociology and psychology and the former research foundation, the paper presents a new with aims to systematically analyze stochastic stability of symmetric coordination game (2x2) under the divergence condition.

结合社会学,心理学等研究成果及已有研究的基础,提出了新模型来系统地研究离散条件下对称协调博弈的随机稳定性,新模型增加了可操作性与实用性,便于分析演化中间状态与逆转成本的具体数量关系,能够更加容易地解释现实中许多现象。

In this thesis, three major achievements were made in theoretical study: conditions and rules for preparing nano-powders by chemical precipitation are analyzed from the point of view of thermodynamics and kinetics, the principle, standards and experimental method for the aqueous dispersion of nano-scaled metal oxide powders were proposed and verified, mathematical model of nano-filming addition of dopants by chemical coprecipitation was established. In experimental research, nm-ZnO, nm-Bi〓O〓, nm-Co〓O〓 and nm-MnO powder with spherical shape, narrow particle size distribution and small particle size were prepared successfully, highly stable and dispersive aqueous suspensoid of nm-ZnO, nm-TiO〓, nm-Co〓O〓 and nm-MnO powder were prepared successfully and surface modification on these nano-powders was also achieved, 0-3 nanocomposite ZnO varistors with nm-ZnO, nm-TiO〓and nm-MnO respectively were prepared successfully by conventional mechanical attrition, and exhibited much better electrical properties than those of conventional varistors.

综上所述,本文在理论研究方面取得了三项成果:(1)从热力学和动力学角度推导并分析了液相化学沉淀法制备纳米粉体的反应条件和规律,(2)提出了纳米氧化物的水分散体系的设计原理、规范和通用实验步骤,(3)提出了共沉淀的数学模型和计算方法;在实验方面所取得的成果有:(1)成功制备了粒度小、分布窄、形貌对称的纳米氧化锌、纳米氧化铋、纳米氧化钴和纳米氧化亚锰,(2)成功地制备了纳米氧化锌、纳米二氧化钛、纳米氧化钴和纳米氧化锰的高稳定分散悬浮液并实现了干粉体的表面改性,(3)成功地进行了纳米氧化锌、纳米二氧化钛和纳米氧化锰对压敏电阻的0—3复合掺杂实验,试样性能远优于常规压敏电阻,为实现压敏电阻的高能高压化提供了新的方法和思路。

It is of great significance to better improve resource-disposition with the correct awareness of the unsymmetry of price infornation leading to harmful results for market mainbody economy.

目前我国经济还处于转型阶段,我们正努力地建立和完善市场经济体系,正确认识价格信息不对称对市场主体经济行为扭曲的经济后果,对于更好地优化资源配置具有重要意义。

The mantle shear zone played an important role in continental blackup. Especially, the dissymmetry caused by simple shear deformation resulted in the different amount of extension in upcrust and subcrust, which in turn formed the detachment of the upper mantle from the crust, that is, the thinning positions of upper mantle and crust were different.

地幔剪切带在大陆裂解过程中起关键性作用,特别是简单剪切变形所产生的强烈不对称构造,以至壳上伸展量明显不同于壳下伸展量,壳幔明显折离,使得壳幔变薄区的位置明显分离,这将能很好地解释华北地台东部岩石圈地幔演化及其浅部盆地形成等的响应。

In the realistic tax revenue, the tax revenue gambles both sides not to be impossible, not to have the cost gain information, the information content which the information issue side and the demand side has is not assymetrical quickly, the information issue side general meeting unintentionally conceals or abbreviates some to the oneself disadvantageous information, the information demand side in gains and confirmed when these information is must spend the cost.

在现实税收中,税收博弈双方不可能快捷、无成本地获取信息,信息的发布方和需求方拥有的信息量是不对称的,信息的发布方总会有意无意地隐瞒或省略一些对自己不利的信息,信息的需求方在获取和证实这些信息时是要花费成本的。

This polarity is maintained with great seriousness: manipulators and manipulated, actors and imitators, simulants and simulated, stupefiers and stupefied face one another in a fine symmetry.

这种极端一直严肃认真地维持着:操纵者和被操纵者;演员和仿效者;模拟者和被模拟者;麻木者和被麻木者,他们相互看着对方,并且相互之间很好地形成了对称。

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推荐网络例句

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸,那乌黑、忧郁的眼睛,她便会相信,他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失

But because of its youthful corporate culture—most people are hustled out of the door in their mid-40s—it had no one to send.

但是因为该公司年轻的企业文化——大多数员工在40来岁的时候都被请出公司——一时间没有好的人选。