原子

The empty p orbital and the occupied σorbital by a lone electron pair of carbene point towards H atom and C atom of the C—H bond respectively.

卡宾空的p轨道和占有一对孤电子的σ轨道分别指向C—H键的H原子和C原子。

The influences of decay coefficient of the cavity and the intensity of the field on the phase distribution as well as its fluctuation are discussed.The results show:if there is absence of the phase damping,the phase distribution oscillates with the period π/λ.It presents single leaf at t=nπ/λ,but it splits into multi-leaf construction during the evolution period due to the interaction between the field and the atoms.

结果表明：当腔不存在损耗时，光场相位分布概率以π/λ作周期性振荡；且在t=nπ/λ时刻，光场和原子是退纠缠的，相位分布概率曲线在极坐标图中呈单叶型结构；但在演化周期内，由于光场与原子的相互作用相位分布概率曲线会劈裂为多叶型结构。

A number of electrons revolving around a center of force constitutes an atom; atoms unite in absolutely regular mathematical ratios and form molecules, and these unite with each other to form a multitude of compounds which unite to build the Universe.

许多电子围绕一个能量的核心旋转，就构成了原子；原子按照一定的数学比例组合，就形成了分子；这些分子相互联合，就形成了许多化合物；这些化合物又构成了整个宇宙。

The X-ray crystal structure reveals that thiourea coordinates with Pd via S atom,and the complex as a whole was in complete symmetry with palladium atom at the symmetry center of the plane square structure.

硫脲是有效反萃剂，从萃合物的晶体结构看出，硫脲通过S原子与Pd配位，萃合物以Pd原子为中心构成平面正方型结构。

The process and conditions of cesium atomic fountain were introduced with detailed discussion of the influence of the optical component on fountain optical system.

介绍了实现铯原子喷泉的过程及条件，并详细讨论了光路中各种光学元件对铯原子喷泉光学系统性能的影响。

The work in this dissertation provides a systematic approach for evaluating the accuracy of the laser-cooled cesium fountain frequency and a basis for the design of the standard and the improvement of the accuracy.

本文的工作为正确评定激光冷却与囚禁铯原子喷泉频率基准的准确度提供了系统的理论与方法，为铯原子喷泉频率基准的设计和进一步提高其准确度提供了依据。

Chadwick's discovery made it possible to create elements heavier than uranium in the laboratory.

中子就这样被他发现了。他解决了理论物理学家在原子研究中遇到的难题，完成了原子物理研究上的一项突破性进展。

The advantage of supercritical carbon dioxide used as an environmental medium in polymerization and reactions in supercritical carbon dioxide are described. It includes homogeneous free radical polymerizations, precipitation free radical polymerizations, dispersion free radical polymerizations, emulsion and inverse emulsion free radical polymerizations, cationic polymerizations, ring-opening polymerization, melt-phase condensation polymerizations, sol-gel polymerizations, polymer blend synthesis, catalytic chain transfer polymerizations, oxidative coupling polymerization, nitroxide-mediated radical dispersion, atom-transfer radical polymerization, reversible addition-fragmentation chain transfer polymerization, electrochemical polymerization, simultaneous one-pot combination of enzymatic and chemical polymerization, copolymerization of carbon dioxide used as monomer.

评述了ScCO2作为聚合反应介质的优点，以及在ScCO2中可进行的聚合反应类型，包括均相聚合、沉淀聚合、分散聚合、乳液及反相乳液聚合、阳离子聚合、开环聚合、熔融态缩聚、溶液-凝胶聚合、聚合物混合合成、链催化转移聚合、氧化-偶合反应聚合、氮氧自由基可控活性聚合、原子转移自由基聚合、可逆加成-断裂链转移、电化学聚合、原子转移聚合与酶催化开环聚合两种活性聚合在ScCO2中同时聚合、二氧化碳作为原料共聚合等。

Chronograph Atomic Time Clock is a simple award-winning program which keeps your computer's clock accurate using atomic time servers of the National Institute of Standards and Technology.

计时原子时钟的时间是一个简单的屡获殊荣的计划，让您的电脑时钟的准确使用原子时间服务器的国家标准与技术研究院

The model of an open four-level atomic system is presented on the basis of the closed four-level atomic system.

在封闭的简单四能级原子系统模型的基础上提出了开放的四能级原子系统模型。

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％。