查询词典 chemical compound

They can also be used for such materials as following:making planes and spacecrafts,screening high-speed neutron reactors,a superconductor in electrical appliance industry,The vanadium compound can be used as a caterlyzer in sulphuric acid industry,a mixture of ethylene and propylene in symthetic rubber and a desulfurizer in oil-refinery ,an oxidizer in making nylon,pesticide,polyvinyl chloride,a non-propylene decarbonizer in chemical fertilizer industry,amilioration of A.D.A.non poisonkous desulpurtion.

我公司生产的五氧化二钒99.5级，99级，98级以及偏钒酸铵，用途广泛，它可制取金属钒和钒合金，用于钢铁冶炼\机械，飞机以及宇宙飞船制造等行业，快中子反应堆的屏蔽材料和电子工业的超导材料，钒化物应用于硫酸工业催化剂，合成橡胶的乙烯和丙烯交联，石油精炼中的脱硫，尼龙，农药，塑料聚氯乙烯制造的氧化，化肥工业的笨非尔无毒脱碳，改良A，D，A法无毒脱硫，钒化物还因其色泽艳丽而作为颜料应用到玻璃，陶瓷，医药等行业，钒酸盐也是印染业良好的媒染剂。

In our research on study chemical reaction of active methylene compounds and brom-acetophenone. Because of brom-acetophenone is compound that contain carbonyl and halogen ,which will take place electrophilic substitution and nucleophilic addition. When active methylene compounds are ethyl acetoacetate and β-diketone, controlling reaction condition, we have found that mono-substitution's production and di-substitution's. production is isolated; active methylene compounds are acetoacetanilide and acetoacetanilide derivate, pyrrolidin-2-one derivants were obtained by substitution and close-ring reaction .but there is no report about it.

本文是让活泼亚甲基类化合物与溴代苯乙酮发生化学反应，由于溴代苯乙酮是含有羰基的卤代烃结构，它可以发生亲电取代和亲核加成反应，当活泼亚甲基类化合物为乙酰乙酸乙酯和β-二酮时，控制反应条件可以发生单取代和双取代两种产物；当活泼亚甲基类化合物为乙酰乙酰芳胺类化合物来反应时，溴代苯乙酮中的羰基与氨基会发生分子内的关环反应生成吡咯烷-2-酮衍生物，这在以前的研究中是没有发现的。

This paper introduces industrial application of the new compound slant-hole tray with multiple downcomer in the refinery gas separation unit, The result shows that the methods for design of the new tray is reliable, and the new tray can be used widely among the fractionating tower, absorbing tower, desorber in petrochemical, chemical, pharmaceutical industries and so on.

介绍了新型多溢流复合斜孔塔板在炼厂气体分馏装置上的工业化应用，结果表明其设计方法是可靠的，可以广泛应用于石化、化工、医药等许多行业的精馏塔、吸收塔和解吸塔上，特别适用于液相负荷很大的体系。

The C, H chemical shifts of the compound were assigned and the coupling constant, J values, were also given out. The three downfield proton and carbon signals in the 1H NMR and 13C NMR spectra for target compounds have been assigned for the first time.

对代表性目标化合物TM-I-5c的NMR谱进行了详细的研究，对其C、H化学位移进行了全归属，给出了相应的偶合常数J值，并确定了其空间结构。

However, the properties of biomacromolecule are different from inorganic and organic compound with smaller molecular weights, which include electrostatics property, more complicated shape, the instability of physical and chemical properties and so on. These make crystallization process of biomacromolecule more complex.

然而，生物大分子的许多特性不同于有机和无机的小分子，例如：静电学性质、较复杂的形状及物理化学不稳定性等等，这就使生物大分子的结晶过程变得较为复杂。

This compound could be used as a chemical standard product of Euphorbia fischeriana Steud.

狼毒乙素可作狼毒大戟的化学对照品，以控制其制剂的质量。

In order to find out completely the soil-wheat contaiminated by heavy metals in Tianjin sewage farm, we collect samples on the dry land and examinate contents of heavy metals in soil-wheat system. Firstly, the anthor evaluates that soil irrigated by sewage that has been contaminated slightly, the main polluting factors are Cd and Zn, and then the anthor evaluates soil according to different regions, soil types and irrigating water. Secondly, the anthor analyzes content and enrichment ability of heavy metals in different part of wheat, evaluates wheat is contaiminated by Cd widespreadly, only few samples polluted by Zn.Finally the anthor put up correlative analysis about heavy metal contents in the soil-wheat system, as well as plant enrichment coefficient and some physico-chemical properties of soil, and establishes a prognostic model about heavy metal content among wheat spike, soil, soil types, PH, organic matter and salinity with the quantifying theory.The prognostic accuracy of primarily contaminative factors is the best with compound correlative coefficient examining, the model can be founded.With improvement of living level, people need cleaner food.

为全面了解天津市污灌区农产品生产地土壤和旱地作物小麦的重金属污染状况，我们于2004～2005年对全市污灌区的土壤和小麦进行了采样，在对该区土壤—小麦系统中六种重金属元素(Cd、Cu、Pb、Zn、Cr和Ni)的含量进行检测的基础上，本文首先分析评价了污灌区农田土壤的环境质量总体已达到了轻度污染水平，主要的污染因子是Cd和Zn，同时对污灌区农田土壤分区县、土壤类型和不同灌水类型进行了评价；然后分析了重金属在小麦不同部位的含量与富集能力，评价了污灌区旱地作物小麦普遍遭受了Cd的污染，只有个别样点遭受了Zn的污染；最后对土壤—小麦系统重金属含量间以及植物富集系数与土壤部分理化性质间进行了相关分析，由于土壤类型是定性变量，本论文以数量化理论建立了小麦穗实中重金属含量与土壤中重金属全量、土壤类型、PH值、有机质和全盐量间的预测模型，经复相关系数检验，污灌区主要的污染因子Cd和Zn的预测精度最高，模型可以成立。

Positive such as all compound combine to°from the chemical element of so, all art relate to combine of factors such as lines, space, shape, material and color etc. or organization, unless theoretically study, these basic factors never isolatedly present a fictile factor of decorate skill.

正如所有化合物都是由化学元素组合而成的那样，所有的艺术都与线条、空间、形状、材料和色彩等因素的结合或组织有关，除非在理论上探讨，这些基本因素从不孤立地显现可塑因素的装饰手法。

By mixing the wastewater and the compound flocculator together which will set off chemical and physical reactions, and filtrating the deposition , we can get clear water .

这个工艺主要是把要处理的废水和复合絮凝剂混合，发生化学与物理反应，在通过高浊度污水净化器内使絮体与水快速分离达到处理要求。

By mixing the wastewater and the compound flocculator together which will set off chemical and phisical reactions, and filtrating the deposition , we can get clear water .

这个工艺主要是把要处理的废水和复合絮凝剂混合，发生化学与物理反应，在通过高浊度污水净化器内使絮体与水快速分离达到处理要求。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。