缩并

The reaction process in methanol solvent can be deduced from the computational results with CPCM solvent model and the supermolecular handling, namely the reaction involves four steps in the methanol solvent. The nucleophilic addition of trimethylamine to acraldehyde generates an enolate. Nucleophilic attack of the enolate on the aldehyde forms the carbon-carbon bond, followed by the proton-transfer process and the further elimination generating the product and liberating the trimethylamine catalyst.

对于CH3OH对反应体系的影响，可以综合考虑CPCM溶剂模型及超分子模型下的研究结果，即CH3OH溶剂中反应按四步进行，催化剂三甲胺首先与丙烯醛发生亲核加成，生成的两性离子中间体与甲醛发生类似于Aldol的醛醇缩合，形成碳-碳键，之后发生分子内质子转移，最后经E1cb消除得到产物，并释放催化剂三甲胺。

In this scheme, the description of unitary evolution and quantum measurement is unified and the quantum control operation is represented by probability state transition. The algorithm works as follows. At first a measurement is applied on the system. If the state after collapse is not the desired eigenstate, then system evolution will go on. After a period of time, the system is measured again. The process will go on like this until we get the desired eigenstate by measurement. Finally the system is driven to the target state with admissible control as before.

4把本征态能控性概念进一步向前发展，提出了概率能控性的概念，将幺正演化和量子测量这两种量子控制手段统一的用概率状态转移来描述，并针对一类特殊的本征态能控的系统，提出了幺正演化和测量交替进行的量子反馈控制策略：如果单步测量所得到的本征态不是期望的本征态，则让系统以这一本征态作为新的初态进行下一步的幺正演化，然后在适当的时候再次测量，让系统塌缩到某一本征态，如此重复进行，直到达到期望的目标态为止。

Juvenile bronchial asthma is a severe disease which is harmful to children. It characterized of whoop , dyspnea , chest stuffiness and cough time after time. It is caused by the EOS, T-cell and so on which lead the chronic inflammation of respiratory air-way. Asthma often outbreak or aggravate at nighttime and early morning.

支气管哮喘简称哮喘，是由嗜酸性粒细胞、肥大细胞和T淋巴细胞等多种炎性细胞参与的气道慢性炎症，使易感者对各种激发因子具有气道高反应性，并可引起气道缩窄，表现为反复发作的喘息、呼吸困难、胸闷或咳嗽等症状，常在夜间和清晨发作、加剧，多数患儿可经治疗或自行缓解。

The X-ray imaging observation and the localized velocity structure favor such a bound-incoming model that these two clusters, with a true spatial separation of about 6.4Mpc/h, are moving together with a relative velocity of 664 km/s along the direction with a projection angle of 71.5 du.

近来的X-ray成像观测以及局域速度结构支持这样一种束缚塌缩模型：两星系团的真实空间距离约为6.4Mpc/h，其投影角为71.5度，并正以大约664千米每秒的相对速度靠近。

The model was used to simulate the angular velocity distribution of the liquid Al Si alloy under different magnetic intensity .

在对电磁离心工艺深入分析的基础上，建立了该工艺过程中液态金属角速度分布数学模型·并模拟了不同磁场强度下，液态金属角速度分布·结果表明：为避免铸件产生缩松，在电磁离心铸造过程中，必须有合适的磁场强

In this thesis, a convenient and efficient synthesis of highly functionalizeddihydropyrido[2,3-d]pyrimidines via a double [5 + 1] annulation strategy startingfrom easily available α-alkenoyl-α-carbamoyl ketene--acetals 1 and cheapreagents (NH4OAc, DMF, and POCl3) has been developed.

本论文探索了一种简便有效的合成高度官能化的二氢吡啶并[2，3-d]嘧啶的方法，此方法由易得的α-乙酰基-α-氨基乙酰基二硫缩烯酮1和便宜的试剂(醋酸铵，二甲基甲酰胺和三氯氧磷)通过两步[5 + 1]加成而实现。

Results The pharynx, larynx, epiglottic cartilage, thyroid cartilage, cricoid cartilage, arytenoid cartilage, hyoid bone, vocal cord, artery, and vein were successfully restructured and displayed.

结果 成功重建并显示了咽、喉、会厌软骨、甲状软骨、环状软骨、杓状软骨、舌骨、声带、动脉、静脉、环杓肌、咽缩肌、甲状舌骨肌等结构，形成三维立体模型，使其可以任意角度旋转、切割、观察。

According to the application of the cement treated base,this thesis analyzes the cause of reflection cracks in cement treated base asphalt pavement,combined with strength,dry and heat shrinkage deformation properties, anti-crack evaluation index is put forward.

针对目前水泥碎石基层的应用现状，分析了水泥碎石基层沥青路面产生反射裂缝的成因，并结合强度、干温缩变形性能提出了综合抗裂指数的抗裂评价指标。

This seems to work fairly well and allows the same game to be scaled in a window of any size.

这看来相当好，并允许在同一比赛将在任何大小的窗口缩放。

Result vitamin A and 4HPR fall to Hela cell collect form have apparent inhibition, can restrain Hela cell to be opposite the action causing tumor of naked rat (the curb tumour action of P.01); vitamin A issues visible cell solid by force to shrink at 4HPR(P.01); report lens, nuclear film is screwy, nuclear chromosome gathers agglomerate stand by the wither such as nuclear film to die DNA of cell of cellular feature; by degradation, a collection of illustrative plates of typical " of shape of " a flight of stairs appears in electrophoresis of agaragar candy gel.

结果维生素A和4HPR对Hela细胞集落形成有明显抑制功能，并可抑制Hela细胞对裸鼠的致瘤功能(P.01)；维生素A的抑瘤功能强于4HPR(P.01)；电镜下可见细胞固缩，核膜扭曲，核染色体聚集成块并靠近核膜等凋亡细胞特征；细胞DNA被降解，在琼脂糖凝胶电泳中呈现典型的&阶梯状&图谱。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。