查询词典 chemical compound

Structure and composition analysis of the experiment: it is the determination of the chemical composition or compound of atoms or atomic group of an experimental space structure.

结构及成分分析实验：它是测定物质的化学组分或化合物的原子或原子团的空间结构的一种实验。

The manufacture of chemicals from petroleum is based on the ready response of the various compound types to basic chemical reactions, such as oxidation, halogenation, nitration, dehydrogenation, addition, polymerization, and alkylation.

从石油生产化学品的依据是各种类型的化合物对各种基本的化学作用感应迅速，如氧化作用、卤化作用、硝化作用、脱氢作用、添加作用、聚合作用和烷基化作用。

The manufacture of chemicals from petroleum is based on the ready response of the various compound types to basic chemical reactions, such as oxidation, halogenation, nitration, dehydrogenation, addition, polymerization, alkylation.

从石油生产化学品的依据是各种类型的化合物对各种基本的化学作用感应迅速，如氧化作用、卤化作用、硝化作用、脱氢作用、添加作用、聚合作用和烷基化作用。

Ure of chemicals from petroleum is based on the ready response of the various compound types to basic chemical reactions, such as oxidation, halogenation, nitration, dehydrogenation, addition, polymerization, and alkylation.

从石油生产化学品的依据是各种类型的化合物对各种基本的化学作用感应迅速，如氧化作用、卤化作用、硝化作用、脱氢作用、添加作用、聚合作用和烷基化作用。

Ultra-high pressure vessels are widely applied in the fields and industries of chemical, petrochemical, artifical crystal, compound diamond, isometrical hydrostatics treatment, ultra-high hydrostatics extrusion, powder metallurgy, material moulding, physical geography, geologic mechanism etc.

超高压容器广泛运用在化学、石化、人造水晶、合成金刚石、等静压处理、超高静液压挤压、粉末冶金、金属成型、地球物理和地质力学等行业或领域。

Polyphenol compound was one of important chemical components in Laminaria japonica against infection of alginic acid decomposing bacteria.

多酚类化合物是海带抵抗褐藻酸降解菌入侵的重要化学防御物质。

He successfully isolated the chemical from the mould Penicillium notatum, but could not purify the compound.

他成功的将盘尼西林从特异青霉素霉菌中提取了出来，但无法对混合物进行提纯。

The most parts of thesis as follows:1. Five symmetrical intra-molecular charge transfer oligomeric phenylene vinylene light emitting materials were designed and synthesized using oligomeric phenylene vinylene as a framework.2. The structures of target molecule were characterized by ~1HNMR,~(13)CNMR, IR, MS and element analysis.3. In order to study the influence of the location and numbers of electron-donor and electron-acceptor on their photoelectric performance by changing length of OPV chain, the UV spectra and fluorescence spectra of target compounds has been compared. We have researched into main factors effecting on material emitting red-shift; organic electroluminescence device was prepared using the compound P4. The capability of eletroluminescence was researched.4. The photoelectric properties of P4 was explained by quantum chemical calculation (the Gaussian 98 quantum chemistry program). It is greatly contributed know the whole process of charge transfer to guide the design of red emitters.

本文研究的内容主要包括以下部分：(1)设计并合成5个对称的以齐聚苯乙烯类为骨架的分子内电荷转移型齐聚苯乙烯类发光材料；(2)通过IR，MS，~1H-NMR，~(13)C-NMR和元素分析对所合成的目标化合物进行表征；(3)通过对目标化合物的紫外光谱和荧光光谱比较分析，研究改变OPV的长度，电子给体和电子受体的位置及数量对其光电性能的影响，探讨材料发射红移的主要因素；选取性能良好的目标化合物P4制备成OELD器件，对其电致发光性能进行研究；(4)运用Gaussian98量子化学程序包，采用量子化学方法对目标化合物P4的光电性能从理论加以解释，进一步认识荷移跃迁的整个过程，为红光材料的设计加以指导。

The sample was isolated by sephadex G-25 gel filtration column after concentration. Then bioactivity was assayed by Candida albicans. The chemical components were isolated and identified by GC-MS. GC determined the relative percentage content of the extract, nine kinds of components were separated, identified and accounted for about 82.12%, the major compound was propenyl methyl disulfide.

浓缩后的样品通过Sephadex G-25凝胶柱分离提纯其中的有效成分，以白色念球菌进行生物活性测定，并用气相色谱-质谱法对其化学成分进行分离鉴定，GC法测定各种化合物的相对百分含量，共鉴定了9种成分，约占总提取物的82.12％，其中，主要物质是甲基丙烯基二硫化物。

With the protrusive vehicle tail-gas pollution increasingly multiply, there has been symptomatic of light chemical pollution in each city, together with being formed the phenomenon of atmosphere compound pollution.

珠三角形成了以广州、佛山为中心的酸雨高发地带，各城市机动车尾气型空气污染问题日益凸显，已出现光化学污染征兆，并形成了区域大气复合污染现象。

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。