共价键

The results show that the bonds between the coordinate waters and the Mg atom have certain extent covalent character.

结果表明Mg原子与配位水分子之间的配位键具有共价键性质。

Molecular capsules based on glycoluril are one kind of unique artificial receptors assembled through noncovalent weak interactions and has already been widely applied to molecular recognition, self-assembly, molecular reactor and smart material.

甘脲类分子胶囊是一类独特的由非共价键弱相互作用力组装而成的人工受体，在分子识别、自组装、分子微反应器、智能材料等方面得到了广泛而深入的研究。

It indicates that sp3 bonds have been formed between adjacent fullerene molecus via [2+2] cycloaddition reaction, leading to the inequivalent sp2 carbons on C60 cage. The former line has been broadened and has several components due to this inequivalent sp2 carbons.

这表明通过[2+2]加环反应在邻近C60分子之间形成了sp3杂化共价键，使得C60分子球笼上出现了五个位置不等价的sp2杂化碳原子，导致位于145ppm附近的sp2杂化峰展宽。

In order to improve the solubility of the CNTs in solution without any structural damage, the surface-modified approach with noncovalent bond is considered. Anionic polyelectrolyte, poly(sodium 4-styrenesulfonate), used as modifier was applied to overcome the difficulty of CNT's dispersion into insoluble and infusible polymer matrix.

为了使奈米碳管在高分子基材中达到良好的分散性，又不会破坏其原始特性，本研究采用非共价键结表面改质的方式来进行奈米碳管之分散，研究中以阴离子型聚电解质，Poly(Sodium 4-Styrenesulfonate)，为奈米碳管分散剂。

Hybrid mesoporous molecular sieve materials with hexagonal mesoporous structure and covalent bonded polyoxometalates were synthesized based on tetraethoxysilane anti lacunary polyoxometalate, SiW11, via sol-gel method in the presence of triblock copolymers P123 as the structure-directing agent. The influences of molar ratio of inorganic precursors and aging temperature on the structure and the loadings of SiW11 in the hybrid materials were investigated. Some reaction details in the synthesis were revealed.

用嵌段共聚物P123为模板剂，正硅酸乙酯和缺位结构的多金属氧酸盐SiW11为无机前驱体，由溶胶－凝胶法合成了具有六方结构和SiW11共价键联的介孔分子筛杂化材料SiW11/SBA-15，着重考察了无机前驱的配比和老化温度对杂化材料结构及SiW11负载量的影响。

Monomers A monomer is the basic building block of polymers.The word mer (from the Greek meros,meaning part) indicates the smallest repetitive unit,similar to the term unit cell in crystal structures.Thus,polymer means many mers or units.Monomers are organic materials.They include carbon atoms joined in covalent bonds with other atoms such as hudrogen,oxygen,nitrogen,fluorine,chlorine,silicon,and sulfur.

单体 单体是基本积木的polymers.the字经（从希腊美罗斯，这意味着部分）显示，最小的重复单位，类似的任期股细胞在晶体structures.thus ，高分子意味着许多市场汇率或units.monomers是有机materials.they包括碳原子加入共价键，与其他原子如hudrogen ，氧气，氮气，氟，氯，硅，硫。

There have been a few studies on the coordination behavior of these metals in both aqueous and nonaqueous media.

组装的原理是通过共价键和分子间力在刚性配体的支持下将构件连接成配位聚合物。

Compound 4 exhibits an unusual 2-D (4,6)-lattice-type network constructed by the [Co222]2- dimers and [Co(H2O)2]2+ units. As for Compound 5, four basic units link to each other form an approximately parallelogrammic pore, which constructed a 2-D covalent bond double-layers network.

化合物4展现出由[Co_2_2_2]~(2-)二聚体和[Co(H_2O)_2]~(2+)组成的具有4、6两种格子的不同寻常的二维网状结构，化合物5以类平行四边形孔道为基本单元构筑了二维共价键网络结构。

We immobilized carbonic anhydrase onto the surface of membrane oxygenator of polymethyl pentene to enhance the removal of carbon dioxide in blood by two steps.

采用两步法将碳酸酐酶共价键合在聚甲基戊烯(Polymethyl-pentene， PMP)膜式氧合器表面以提高其清除血液中CO2的能力。

Results show that protons are liberated by dehydration or dehydroxylation after calcination at 500℃. These protons disrupt the silicon-oxygen-aluminium bridges where there are Al substitutions in the tetrahedral sheet of the montmorillonite. Some of silicon-oxygen and aluminum-oxygen tetrahedral invert to react with the pillaring agents and yield covalent bonds which firmly fix the pillars to the host clay. The Al-MMT are thermally and hydrothermally stable up to 700℃.

经过500℃高温焙烧后，交联剂经脱水或脱羟基释放出质子攻击蒙脱土四面体层中Si-O-Al四键，硅氧四面体和铝氧四面体发生翻转，与交联剂发生反应生成共价键，形成稳定的层柱黏土材料，在700℃高温下，Al-MMT材料不仅具有较好的热稳定性，而且具有较好的水热稳定性。

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。