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preparation methods
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  制备方法
     INFLUENCE OF PREPARATION METHODS ON THE PERFORMANCES OF SiO_2-Al_2O_3 GEL
     不同制备方法对SiO_2-Al_2O_3凝胶性能的影响
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     PREPARATION METHODS OF AMORPHOUS HYDROGENATED CARBON THIN FILMS
     无定形氢化碳薄膜的制备方法
短句来源
     Relation between the Preparation Methods of Molybdenum Trioxide-Silicon Oxide and Their Surface Structure and Surface Acidity
     三氧化钼-二氧化硅的制备方法与表面结构、表面酸性的关系
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     STUDIES OF ETHYLENE POLYMERIZATION OVER EXCHANGED ZEOLITES Ⅶ. EFFECT OF PREPARATION METHODS ON THE CATALYTIC PROPERTIES OF PdY ZEOLITES
     交换沸石催化剂上乙烯聚合反应的研究 Ⅶ.制备方法对PdY沸石催化性能的影响
短句来源
     The Preparation Methods of Pt/SnO2 Catalyst Dope by REOX
     添加稀土氧化物的Pt/SnO_2催化剂的制备方法
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  “preparation methods”译为未确定词的双语例句
     Thermal Behavior and Kinetics of the Decomposition of CuC_2O_4-ZnC_2O_4·2H_2O by Different Preparation Methods
     不同制备方法的CuC_2O_4-ZnC_2O_4·2H_2O的热行为和热分解动力学
短句来源
     Effect of Preparation Methods on the Properties of Zr_(0.9)Ti_(0.1)(Ni,Co,Mn,V)_(2+α) Hydrogen Storage Alloys
     Zr_(0.9)Ti_(0.1)(Ni,Co,Mn,V)_(2+α)贮氢合金的制备过程对其性能的影响
短句来源
     INFLUENCES OF PREPARATION METHODS ON STRUCTURE AND PROPERTIES IN BI-LAYERED PEROVSKITE MANGANITES La_(1.4) (Ca_(1-x)Sr_x)_(1.6) Mn_2O_7
     双层钙钛矿锰氧化物La_(1.4)(Ca_(1-x)Sr_x)_(1.6)Mn_2O_7的制备工艺对材料结构和性能的影响
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     Researching Status of Preparation Methods for Nanometer TiO_2 by TiCl_4
     用TiCl_4制备纳米TiO_2的研究状况
短句来源
     From AAS analysis, it shows that the composition of as-cast La3-xMgxNi2.5Co0.5 (x=0.1, 0.33, 0.5, 0.8) alloys synthesized with induction melting preparation methods was controlled well.
     原子吸收光谱分析结果表明,感应熔炼法制备La_(3-x)Mg_xNi_(2.5)Co_(0.5)(X=0.1,0.33,0.5,0.8)系列贮氢合金,可以有效抑制Mg的挥发和准确控制合金成分。
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  相似匹配句对
     Preparation Methods of Macromonomers
     大分子单体的制备方法
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     Preparation methods for trehalose
     海藻糖的生产方法
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     Methods:?
     材料与方法:
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     [Methods]
     【方法】
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  preparation methods
In our experiment, cloned embryos were reconstructed with different passage and preparation methods of ossocartilaginous cell, skin fibroblast, and cumulus cells.
      
In this paper, preparation methods, surface modification and application of magnetic carriers are reviewed.
      
Effects of preparation methods of support on the properties of nickel catalyst for hydrogenation of m-dinitrobenzene
      
Two sample preparation methods were introduced and compared in this paper to establish a simple, quick and exact analysis of geosmin and 2-methylisoborneol.
      
Physicochemical regularities and analytical potentialities of chromatomembrane gas extraction and chromatomembrane absorption as sample-preparation methods in determining organic pollutants in natural waters and atmospheric air were considered.
      
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The preparation method of p-nitrobenzoic acid from p-nitrotolueneby oxygen oxidation is reported. Effects of catalysts, solvents, reactiontemperature, reaction time and chloroacetic acid on yields of the productwere studied. Optimum conditions were found and better yields weregiven. The proposed method may be used as a new technic for thepreparation of p-nitrobenzoic acid, and provides the necessary conditionsfor further studies on air oxidation.

本文报导在常压下氧气氧化对硝基甲苯制备对硝基苯甲酸的方法。对催化剂、溶剂、反应温度、反应时间和氯乙酸与收率的关系作了研究。寻出最佳反应条件,取得较好收率。本法可用于生产,也为空气氧化法提供了必要的化学反应前提。

In recent years,there has been an extremely active study of amorphous semiconductors. The present article will provide a survey of the electronic structure,conduction mechanism,electrical and optical properties of amorphous semiconductors mainly of amorphous silicon,as well as its preparation methods and its application to solar cells.

近几年来,对非晶态半导体的研究极为活跃。本文概述了非晶态半导体主要是非晶硅的电子结构、导电机理、电学和光学特性,以及它的制备方法和在太阳能电池方面的应用。

The preparation methods for perovskite-type catalysts, particularly the calcination step were investigated. Three methods, e.g. the thermal decomposition method (Ⅰ), the coprecipitation method (Ⅱ) and the complexing method (Ⅲ)were chosen for comparison with LaCoO_3 as catalyst. X-ray diffraction analysis, thermal analysis, surface measurement, electron microprobe and scanning electron microscopic examination as well as catalytic activity determination were used to describe the characteristics...

The preparation methods for perovskite-type catalysts, particularly the calcination step were investigated. Three methods, e.g. the thermal decomposition method (Ⅰ), the coprecipitation method (Ⅱ) and the complexing method (Ⅲ)were chosen for comparison with LaCoO_3 as catalyst. X-ray diffraction analysis, thermal analysis, surface measurement, electron microprobe and scanning electron microscopic examination as well as catalytic activity determination were used to describe the characteristics of the samples especially for the precursor prepared by method (Ⅲ).@@@@It was found that the calcining temperature required for the formation of perovskite crystalline structure depended largely on the preparation method of precursor. In the case of method (Ⅲ), the perovskite crystal appeared when calcining at 450℃ and the solid state reaction for LaCoO_3 formation nearly completed at 750℃ for 2 hrs. But in the case of methods (Ⅰ) and (Ⅱ) , little perovskite formed until 800℃. The surface area of product resulted from (Ⅲ) decreased sharply when the calcining temperature exceeded 550℃ and a texture-like structure composed of a series of bead with 0.5μ was found at 870℃. Furthermore, the sample prepared by method (Ⅲ) exhibited the highest activity in the oxidation of CO.@@@@It was proposed that by method(Ⅲ), a highly dispersed solid system of Co and La was obtained so that the solid state reaction between the components could take place at rather low temperature. In the precursors prepared by method (Ⅰ), (Ⅱ), a long distance diffusion resistance would be overcome before the reaction occured. A mechanism involving the transfer of oxygen through gas phase was suggested for the cases of method (Ⅰ), (Ⅱ).

本工作是对钙钛矿型稀土催化剂的合成方法,特别是对其烧成过程的研究。以LaCoO_3的合成为例,对硝酸盐热解法、共沉淀法和柠檬酸络合法三种合成基体的方法进行了比较。报导了用X-射线衍射分析、差热分析、化学组成分析、扫描电镜、电子探针、比表面积测定和催化活性的研究情况,着重阐述了有关络合法的研究结果。实验表明,烧成温度与合成基体的方法有关。络合法可在低温下烧成钙钛矿结晶、450℃即有LaCoO_3生成,比文献报导的一般烧成温度低得多。其他两种方法台成时,则需800℃以上才有显著量LaCoO_3生成。络合法可避免高温下钴的流失,有利于制得规定组成和结构的产物。550℃烧成者为片状构造,870℃时转变为球状粒子串接成的理纹构造,球径大约为0.5μ。此外,络合法还可大大缩短烧成时间。以CO氧化反应为模型反应,对比结果为用络合法烧成者催化活性最高。对烧成机理作了初步探讨。络合法合成的特点是可制得具有大量缺陷结构的、各组元高度分散的基体,组元离子只需经短距离扩散即可达成反应。其他两种方法合成者则组元离子需经历长距离扩散才能达成固相反应,烧成过程可能还与氧的气相转移机理有关。

 
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