这种修正的分子连接性指数是由原子半径取代原子的点价计算得来。
This indices were derived from the substitution of the atom valence of vertex by atom radius in the calculations of the molecular connectivity indices.
在半重水的水分子中，一个氢原子（H）被一个称之为氘（D）的氢原子的同位素所取代。
In a semiheavy water molecule, one hydrogen atom (H) is replaced with a heftier version called deuterium (D).
为环状构造的化合物，环中一个或多个碳原子被另一元素的一个原子（诸如氮、硫、或氧）所取代。
Ring compounds in which one or more of the carbon atoms in the ring are replaced by an atom of another element such as nitrogen, sulfur or oxygen.
本文建立了一种以气动稳流取代蠕动泵的流动注射氢化物发生原子吸收测定趾甲中硒的方法。
A method for determining selenium in human's toenail by using pneumatic steady flow injection with hydride generation atomic absorption spectrometry instead of peristaltic pump has been developed.
他们主张用整体论、建构论、去客观化、或然论和定性研究来取代心理学研究中因袭已久的原子论、还原论、客观论、决定论和定量分析。
They propose to replace the atomism, reductionism, objectivity, determinism and quantati tive study with holism, constructionism, deobjectification, problematicism and qua litative study.
摘要碳环糖是一类呋喃或吡喃糖环中的氧原子被亚甲基取代后形成的糖类似物。
Carbasugars carbocyclic analogues of true sugars are compounds in which the ring-oxygen of furan oid or pyranoid sugars is replaced by methylene group.
一种同质晶体结构，其中一个或更多类型的原子或分子可以部分地取代原来的原子或分子，而其结构并不发生变化。
A homogeneous crystalline structure in which one or more types of atoms or molecules may be partly substituted for the original atoms and molecules without changing the structure.
阐述了酞菁环的电子结构是其具有气敏性的基础，讨论了配合物中的中心原子和取代基团对配合物气敏性的影响。
The fundamental function of the electron structure of the ring skeleton and the influence of central atoms and substituents on gas-sensitivity is illustrated.
可以用愚浮液进样法取代灰化法处理样品，以火焰原子吸收光谱法测定中草药中的钾。
It is possible to replace the ashing method by suspension sampling method for the determination of potassium in Chinese medicinal herb by flame atomic absorption spectrometry.
钻石中的黄色是由于钻石结构中氮原子缉骸光缴叱剂癸烯含楼取代碳原子而导致的。
The yellow color in diamonds is caused by nitrogen replacing carbon atoms in the diamond's structure.
现代原子理论已取代了这个理论。
一种例外的类型是硅树脂，其链上的碳原子被硅取代作为链中的基本原子。
An exceptional type is represented by silicone resins, in which carbon is replaced by silicon as the basic atom in the chain.
从金属羰基化合物和氧原子转移试剂两个方面讨论了影响CO取代反应速率的各种因素。
Various factors relating to the metal carbonyls and to the o atom transfer reagents that effect the rates of CO substitution are discussed.
本文探讨了有关二聚体的形成与溶剂极性、溶液浓度、取代基团性质及络合金属原子的关系。
In this paper, the correlations of the formation of dimers with solvent polarity, concentration, nature of substituent group and central metal were investigated.
对所有共振谱线进行了全面归属，并讨论了不同取代基和环内不同杂原子对化学位移值的影响。
All of the resonance lines were fully assigned and the effects of substituents and heteroatoms in ring on chemical shifts were discussed.
加成物（ 1 ）与卤素反应后，与锡原子相连的苯基被取代，得到一卤代、二卤代和混合二卤代物（2—8） 。
The phenyl groups in compound 1 were substituted by ICl, Br 2 or I 2 to yield mono- and dihalide derivatives(2—8).
化合物(6)上与氮相连的活泼氢原子，可能对某些反应有不利影响，故用碘甲烷对其进行甲基取代，得到了新的手性胍—化合物(7)，并做了表征。
The active hydrogen in the compound (6) might take negative effect in some reactions and was substituted by a methyl to get compound (7) which was a new chiral guanidine.
反应以自由基机理进行，溴取代主要发生在主链上的叔氢原子上。
Thesubstitution of bromine atoms is on the tertiary carbon of main-chain of the polymersprimally.
溶质原子取代或代替溶剂原子而形成的固溶体。
A solid solution wherein the solute atoms replace or substitute for the host atoms.
从前线轨道特征、电荷分布等与自由卟啉对比讨论了杂原子取代卟啉的电子结构。
Based on the frontier orbital characters and charge distributions the electronic structures of these compounds are discussed.
本发明涉及一种含氟原子和氰基的取代偶氮苯羧酸酯类液晶化合物及其制备方法。
The present invention relates to one kind of substituted azophenyl carboxylate containing fluorine atom and cyan group as liquid crystal compound and its preparation process.
讨论了N原子取代对分子结构及振动模的影响。
The effects of N substitution on the molecular structure and the vibrational modes are also discussed.
结果表明，铁原子通过同晶取代方式进入分子筛骨架，结晶度高，晶粒均匀。
The results showed that Fe atoms embed the framework of FeAPO-5 molecular sieve by isomorphous substitution and the crystallinity of FeAPO-5 molecular sieve exhibited good and grains were uniform.
量子力学是理论物理的一基本分支，理论物理在原子与亚原子水平上取代牛顿力学和经典电磁学。
Quantum mechanics is a fundamental branch of theoretical physics that replaces Newtonian mechanics and classical electromagnetism at the atomic and subatomic levels.
烃中一个或多个氢原子被氯原子取代。
Chlorinated hydrocarbon a hydrocarbon in which one or more hydrogen atoms are replaced by chlorine atoms.
结果显示对1,3-取代位置的优异选择性，并且烷基链可以是饱和的或不饱和的，并且可以含有一种或多种杂原子。
The result shows excellent selectivity of to the 1, 3 - substitution positions, and the alkyl chain may be saturated or unsaturated and may contain one or more heteroatoms.
活性亚甲基上的一个氢原子是被环氧基所取代的。
One of the hydrogen atoms of the active methylene group is replaced with a cyclooxy group.
活性亚甲基上的一个氢原子是被环氧基所取代的。
One of the hydrogen atoms of the active methylene group is replaced with a cyclooxy group.
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