金属化

Crystal lattice constants are close to other experiment results. Three kinds of chemical bonds exist among Mg and B atoms, between magnesium and boride is ionic bond and metallic bond is the predominant interaction in the layer formed by magnesium atoms. A strong covalent bond in the form of sp2 hybrid between boride atoms is the most important factors which can affect the transition temperature of MgB2. Population analysis clearly shows that electrons are transferred from Mg to B, as a result, the electron-phonon coupling in the layer of B is very strong.

规范保守赝势的计算结果表明，晶格常数与实验值误差在很小的范围内，分析了引起MgB2(001)面结构超导转变时电子浓度和偏态密度的变化情况，发现构成该超导体结构的成键有3种，着重从结构的电子浓度变化分析了其超导特性，六角蜂窝状结构中硼原子间相互作用为sp2杂化的共价键，镁原子和硼原子之间是离子键结合，镁原子层是金属键结合，镁原子的价电子部分转移到硼原子的pz轨道，部分电子为镁原子层共用。

Recently, the progress has been made in the area of extending the light absorption of titanium oxide into visible light region by metal doping, metalloid doping, and photosensitization.

目前TiO2可见光催化的研究取得了一定进展，金属掺杂、非金属掺杂和染料光敏化等方法都不同程度地实现了TiO2可见光催化。

The metals which are of particular concern are those which have been shown to be methylated in nature.

人们特别关心那些在自然界能被甲基化的金属。

The problem of microporosity corrosion in metal coating arisen from the imprecision of sealing agent in practice was effectively solved by means of the sealing agent of passive film.

钝化膜封孔剂有效地解决了实际中金属涂层封孔剂涂刷不严造成微孔腐蚀的问题。

In the presence of cobalt ion, nearly 100% selectivity to ortho-chloroanilinewas achieved over PVP-Ru/Pt colloids at 100% conversion of o-CNB, with an activity twoorders of magnitude higher than that of monometallic PVP-Ru colloid.

当在反应体系中加入钴离子时，邻氯硝基苯被高选择性地氢化为邻氯苯胺(邻氯硝基苯转化率为100%时，选择性～100％)，同时，反应的活性比PVP-Ru单金属胶体提高了约两个数量级。

In addition,the one complex containing benzoaza-15-crown-5 pendant has a relatively higher catalytic activity over another one containing morpholine,which may be due to the preponderant effect of hydrophobic environment of the former.

Schiff碱类金属配合物除在氢化反应、环氧化反应、聚合反应、仿生催化氧化等方面得到广泛的应用外[5]，近两年来，我们发现Schiff碱金属配合物也能有效地促进酯的水解或剪切4

When machining hard metals with carbde-tipped cutters, a negative rake angle of about 10 degree is usually employed

。 当用碳化的刀具加工硬金属的时候，通常要有一个10度的后角。

ReShi Chemicals is a specialist in manufacturing and distributing metal surface treatment reagent: phosphorus treatment reagent, water treatment reagents, electro-plating additive reagents, normal temperature nigrescence reagent, pre-treatment reagents ,etc.

是一家专业从事金属表面处理药剂：磷化处理药剂、水处理剂、电镀添加剂、钢铁常温发黑剂以及前处理产品的生产商和代理商。

To study feasibility of individuation design and clinical effect of nitinol stent for relieving malignant gastric outlet obstruction.

摘要目的探讨用于扩张治疗晚期胃窦恶性肿瘤所致胃出口梗阻的金属支架的个体化设计的可行性及临床效果。

Another is studying the effect of silicon nitride on growth rate of metal induced lateral crystallization.

第二部分是探讨氮化矽对金属诱发侧向结晶速率的影响。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。