查询词典 atom

Based on the atomic interaction potential with the embedded atom, molecular dynamics simulation was used to study the variation of Cu（001） surface caused by a Cu adatom and the hopping barriers of another Cu adatom in its vicinity.

采用嵌入原子方法的原子间相互作用势，利用准静态分子动力学模拟研究了Cu原子在Cu（001）表面吸附所导致的基体晶格畸变以及对其附近的另一个吸附原子自扩散行为的影响。

The surface modification reaction is facile and the molecules are directly attached to the neighboring adatom and rest-atom with the formation of two covalent Si-C bonds at the Si (111)-7×7 surface.

我们的研究结果表明，Si（111）-7×7表面上空间分立的硅悬键在表面加成反应中可以看作为分立的活性表面自由基。

The categorical names are often combined, with a six-carbon-atom aldehyde sugar being termed AN aldohexose.

它们的命名经常被结合起来，一个六个碳原子的醛糖被称为已醛糖。

The present invention relates to compounds of formula wherein R is hydrogen, lower alkyl, lower alkoxy, halogen or lower alkyl substituted by halogen; R is hydrogen or halogen; or R and R are together with the carbon atom to which they are attached -CH=CH-CH=CH-; R is hydrogen, lower alkyl, phenyl optionally substituted by halogen, or is hetaryl, optionally substituted by lower alkyl; R is hydrogen, lower alkyl, phenyl, benzyl, lower alkenyl, lower alkoxy, phenyloxy, benzyloxy, S-lower alkyl, halogen, CN, lower alkyl substituted by halogen or O-lower alkyl substituted by halogen; R is hydrogen or lower alkyl, aryl is phenyl or naphthyl; n is 1, 2 or 3; m is 1 or 2; and pharmaceutically acceptable acid addition salts and tautomeric forms thereof.

本发明涉及式化合物及其可药用的酸加成盐和互变异构形式，其中R 1 是氢、低级烷基、低级烷氧基、卤素或被卤素取代的低级烷基；R是氢或卤素；或R 1 和R与它们连接的碳原子一起是-CH＝CH-CH＝CH-；R 2 是氢、低级烷基、任选被卤素取代的苯基或者是任选被低级烷基取代的杂芳基；R 3 是氢、低级烷基、苯基、苄基、低级链烯基、低级烷氧基、苯氧基、苄氧基、S-低级烷基、卤素、CN、被卤素取代的低级烷基或被卤素取代的O-低级烷基；R 4 是氢或低级烷基，芳基是苯基或萘基；n是1、2或3；m是1或2。

The reaction of C_(60) with freshly prepared sodium alkoxide solution under aerobic condition was well investigated,which provides a facile protocol to synthesize a variety of C_(60)-fused tetrahydrofuran derivatives with oxygen atom directly attached to fullerene cage.

系统的研究了C_(60)与新鲜配置的醇钠溶液在O_2存在条件下的反应，得到了一系列氧原子直接与C_(60)分子相连的富勒烯四氢呋喃结构的衍生物。

There is an allotropic change temperature (1155K) for pure Ti and it is a hydrogen-absorbing metal for different solubility in a-phase titanium and 3-phase titanium. The hydrogen atom dissolves in lattice and occupies tetrahedron interstitial position, and then forms TiH2 sublattice of face-centered cubic.

钛是－种具有同素异型转变点T(1155K)的吸氢金属，氢在α钛和β钛中有不同的溶解度，在T以下易形成具有面心立方晶格结构的TiH2，氢原子溶解在晶格中，占据四面体间隙位。

Because these substrates are synthesized from the corresponding allylic alcohols, palladium-catalyzed conversion of allylic alcohols directly into allylation products are highly desirable, especially from the viewpoint of the atom economy.

因为这些受质是从烯丙醇合成的，钯催化烯丙醇转换直接变成烯丙基化合物从原子经济的观点来看是较有益处的。

The result indicated that the AlTiN multilayer coating deposited on high speed steel substrates with alternated nitrogen contents in layers. In each layer, AlTiN exhibited nanocomposites of nanocrystallites embedded into amorphous matrices despite of the nitrogen content. The difference between bilayers was that AlTiN layer with lower nitrogen content had a lower density of nanocrystallites. The AlCN coating deposited on Si (100) substrate appeared a strained layer on substrate in the ilm-substrate interface, which thickness was 3～5 atom layer.

结果表明：在高速钢基体上制备的AlTiN多层薄膜由两种氮含量交替变化的膜层构成，尽管交替的两层中氮含量不同，但每一单层都为纳米晶包含在非晶点阵中的纳米复合结构，不同之处是低氮含量层中纳米晶密度较小；生长在单晶硅基体(100)晶面上的非晶AlCN薄膜，在膜基界面处硅基体上出现应力畸变层，应力畸变层厚度很薄，约3～5个原子层。

The Mo/W atom is coordinated by eight cyanides in an irregular square antiprism.

两个〓中的铜原子处于倒置中心，配位环境为拉长的八面体。

In this model the carbon atom amount, which exist in austenitic crystal lattice, decided the structure size.

在这一模型中决定&有序簇聚结构&尺寸的一个重要因素是奥氏体晶格点阵中实际固溶的碳原子数量。

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％。