原子键

The most preferable substituents are methyl groups for positions R1 and/or R2, due to the existence of a hyperconjugation effect between the p z orbital of the central carbon atom and one of the C—H bond orbitals in methyl group.

当R1， R2位置是甲基时，由于碳原子的p z 轨道与甲基的一个C—H键轨道间存在强的超共轭效应，从而可以较大程度地降低α-氢转移反应的势垒。

In addition, by using bondtype and polyhedron cluster type index methods to analyze the transformation of the microstructure, not only the key role of icosahedron in amorphous formation and stability can be explained, but also the solidification processes and the configuration characteristic of amorphous metals understood deeply.

此外采用键对及原子多面体类型指数法对凝固过程中微观结构组态变化的分析，不但能说明二十面体结构在非晶态合金形成和稳定性中所起的关键作用，又有助于对液态金属的凝固过程、非晶态结构特征的深入理解。

The approaches in organic chemistry reveal the essence of bonding of atoms within the oranic chemicals which constituent the matters in the world, the law of organic molecules interconversion, and designs and synthesizes organic molecules with special structures. Meanwhile, it provides theory, technology and materials for related subjects such as material science, life science and environmental science.

有机化学学科的发展，揭示了构成物质世界的有机化合物分子中各原子间键合的本质以及有机分子转化的规律并设计、合成了具有特定结构的有机分子；它又为材料科学、生命科学、环境科学等相关学科的发展提供了理论、技术和材料。

The NANOparticle used to the high elasticity interstice,strong all of the fibre organize,strong all of the combine power.

该系列球拍，成功的将纳米粒子渗透到高弹性碳原子的空隙之间，对所有碳纤维组织在分子键的基础上进行了补强，并增强分子之间的结合力。

An intramolecular connection that spans atoms or groups of atoms.

一个分子内原子间共用一对电子的化学键。

Simulation of Loop domain near active site was carried out with the PROLOOP programm. The initial model was energy-minimized by the 500 steps of steepest descents method and 500 steps of conjugate gradients . The Vanderwal contacts were eliminated, and the energy of the static electric interation and hydrogen binding were adjusted

优化工作用PROLOOP程序，将活性中心附近LOOP前后的有关残基构象进行最佳拟合，并采用GROMOS软件包中的能量优化程序，作500步最陡速降法及500步共扼梯度法进行优化，彻底消除范德华半径重叠，并进行原子间静电和氢键作用的优化调整，最终得到UK-B链最优结构。

On the other hand, the corresponding bromohydroxylation of 1, 2-allenyl sulfides with Br〓 and water should be carried out in aqueous acete nitrile at 0℃.

在1，2-联烯基硫醚分子中由于同时存在着硫原子和具有两个相互垂直π-键的累积双烯结构，使其具有一些特殊的反应性能。

Based on theoretical calculation of electronegativity of groups offlotation-reagent and method of infra-red adsorption spectroscopy, the collection andadsorption of α-nitroso-β-naphthol in hematite flotation have been studied. The chemicaladsorption seems to be predominant owing to formation of pentacyclic nitrosyl chelate com-pound by atoms of nitrosyl bond in α-nitroso-β-naphthol together with Fe~(3+) on hematitesurface.

研究了α-亚硝基β-萘酚对赤铁矿的捕收性能及吸附规律，导出了吸附方程和吸附速率方程用药剂基团电负性理论计算以及红外吸收光谱法论述了其作用机理α-亚硝基β—萘酚主要是以N O键合原子与赤铁矿表面的Fe形成N O五元环螯合物而化学吸附。

The coordination of noble gas atoms leads to a shift of the M-O stretch frequency.

由于稀有气体原子的配位，影响了过渡金属氧化物M-O键的强弱，从而导致M-O伸缩振动频率发生位移。

The metal ions form ionic bonds, which are nondirectional, with oxygen atoms that previously had been bonded rigidly to specific Si atoms.

金属离子与氧原子形成无方向性的离子键，而氧原子之前一直牢固结合在特殊的硅原子上。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。