查询词典 covalent bond

A chemical bond consisting of a hydrogen atom between two electronegative atoms (e.g., oxygen or nitrogen) with one side be a covalent bond and the other being an ionic bond .

一种化学键：由两个负电原子及其间的氢原子组成，其中一边是共价键，另一边是离子键。

May be an electrovalent bond , covalent bond and metallic bond mark like chemistry key.

化学键一般可分为离子键、共价键和金属键。

Gemini surfactants are novel surfactant with especial molecule structure, which are made up of at least two hydrophilic groups and two hydrophobic groups. They are connected at the level of the head groups by a spacer groups through chemical bond (covalent bond or electrovalent bond).

孪连表面活性剂是一种结构较为特殊的新型表面活性剂，其分子中至少含有两个亲水基和两条疏水链，在其亲水基或靠近亲水基处，由联接基团通过化学键联接在一起。

The chemical bonding is formed the between coating and the substrate. The bond shows a mixed property of covalent bond and ionic bond.

镍晶格和基体粒子之间产生了键合作用，形成的键显示出共价键和离子键的混合性质。

Usually, they are suitable to mixed crystals with metallic bond but not to those with covalent bond or ionic bond.

上述近似方法通常适用于金属键混晶系统，但对于共价键或离子键混晶系统计算结果则不理想。

Results indicate that non-covalent bonds, including hydrogen bond and hydrophobic reaction contribute most to the coagulating reaction, while ionic bond and disulfide bond have little effect on the coagulating process.

结果发现凝固过程中的分子间作用力主要是氢键和疏水作用，而离子键和二硫键对凝固过程影响不大。

There are many factors that determine the ionic bond and covalent bond. What kind of chemical bond is formed between two atoms does not only have connections to the atom itself.It is related to the price attitude of the iton.

决定离子键、共价键的因素比较多，两原子之间形成哪种类型化学键不仅与原子本身性质有关，还与形成的化合物中离子的价态有关。

However, the thermal stability of metallic coordination polymer hardly enhanced in comparison with the polymer never coordinated transitional metallic ions. The reason might be that the energy of coordinate bond formed between metallic ion and polymer was trival in comparison with that of covalent bond in polymer. It started with coordinate bond when the coordinate polymer decomposed under high temperature, so it engendered little for the thermal stability at high temperature.

而金属配聚物较未配位金属的配体高温热稳定性提高不大，可能是由于金属离子与配体之间形成配位键的键能与配位体内的共价键键能相比要小得多，当金属配聚物受热裂解时，首先从配位键开始，因此对高温热稳定性的影响甚微。

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。

On the other hand, in the ground state of NiSin(n=1-6) and Ni2Sin(n=1-6) clusters, electronic charges is transferred from Si-Si bond to Ni-Si bond, forming Ni-Si covalent bond, and the Mulliken overlap population of Ni-Si is positive, which I'orming bonding orbital and contribute to the stability of clusters.

另外，基态NiSi_n(n=1-6)团簇中，电荷从Si-Si键向Ni-Si键转移，形成Ni-Si共价键，Ni-Si重叠布局为正，为成键轨道，增强团簇的稳定性。

More direct, directer ; most direct, directest

径直的，笔直的

Do you know how to use a chain saw?

你知道如何使用链锯吗？