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reaction
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  反应
    Study on Synthesis of Organic Chloride by the Reaction Rectification Technique
    有机氯化物的反应精馏合成研究
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    Study on the Nonlinear Behavior of CO Coupling-regeneration Reaction System
    CO偶联再生反应系统的非线性行为研究
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    Transport and Reaction in Microchannel Recator
    微通道反应器的传递和反应特性
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    The Studies of Catalysis and Chemical Reaction Engineering on Hydroesterification of Ethylene to Synthesis of Propionic Ester
    乙烯氢酯基化合成丙酸酯的催化及反应工程研究
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    A STUDY ON THE REACTION OF PHOSPHATE BONDED ALUMINA CASTABLES AT 105~500℃
    磷酸铝胶结剂和刚玉骨料在105~500℃的反应
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  化学反应
    THE GRAPHICAL ANALYSIS AND CALCULATION OF ABSORPTION ACCOMPANIED BY THE INFINITELY RAPID IRREVERSIBLE CHEMICAL REACTION
    伴有飞速不可逆化学反应的吸收图解分析和计算
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    Chemical Reaction Engineering in Metals Production J. Szekely
    金属生产中的化学反应工程
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    New development in world chemical reaction engineering.
    世界化学反应工程新进展
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    A Simple Introduction of the Synthesis of ultrafine Si_3N_4 Powders by the Laser-Induced Chemical Reaction
    利用激光诱发化学反应合成Si_3N_4超细粉末概述
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    MECHANO-CHEMICAL REACTION AND CHEMICAL CHANGE IN THE GRINDING OF MIXED PbO AND TiO_2 POWDER
    PbO和TiO_2混合粉磨的机械力化学反应和化学变化
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  “reaction”译为未确定词的双语例句
    An Engineering Model for Multicomponent, Reversible Reaction Network
    多元可逆反应网络的一个工程模型
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    A New-Type Stirring Reaction Device-Resonance Stirring Reactor
    一种新型的振动搅拌装置─共振搅拌反应器
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    Multicomponent Diffusion Model for Effectiveness Factors of Porous Catalysts (Ⅱ) Effectiveness factors of high-temperature shift reaction catalyst B109
    多孔催化剂效率因子的多组分扩散模型 (Ⅱ)B109中温变换催化剂的效率因子
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    A Mathematical Model of a Tubular Reactor for Exothermic Liquid Phase Reaction and its Application
    均液相管道反应器的数学模型及其应用——邻硝基氯苯氨化反应器的设计
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    THE ISOTOPIC EFFECT OF THE U(Ⅳ)-U(Ⅵ) ELEC-TRONIC EXCHANGE REACTION IN HYDROCHLO-RIC ACID SOLUTION OF HIGH CONCENTRATION CONTAINING CATALYSTS
    在含有催化剂Fe~(2+)的高浓度盐酸介质中U(Ⅳ)-U(Ⅵ)电子交换过程的同位素效应
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  reaction
Several 1-(substituted phenoxy)-3-{[4-(4-trifluoromethyl) phenoxy] piperidin-1-yl} propan-2-ols (str.II) were prepared in a six-step reaction sequence starting from methylamine and ethyl acrylate and evaluated for antidepressant activity.
      
Substituents at the 4th and 5th positions of the target thiazoles were introduced by a Hantzsch reaction, and the chain at the second position was extended through a Sandmeyer reaction, formylation, and Wittig olefination.
      
A series of ortho- meta- and para-N9-[(chloromethylphenyl)methyl]chloropurines 4-12 and N7-[(chloromethylphenyl)methyl]chloropurines 13-21 were obtained by the reaction of various substituted chloropurines with α,α'-dichloroxylenes.
      
A series of 1-[(sub)]-6-fluoro-3- [(sub)]-1, 3, 4-oxadiazol-2-yl-7-piperazino-1, 4-dihydro 4-quinolinones were synthesized by the reaction between ciprofloxacin and norfloxacin with an appropriate acid hydrazide in phosphorous oxychloride.
      
The pyrazolo[4,3-d]oxazinone 4 was obtained from direct reaction of the acid 1 with hydroxylamine hydrochloride.
      
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The corrosive action of neutral and reducing gas streams containing HF at high temperatures on fireclay and high-alumina refractories has been investigated. The influences of HF eoncontration, temperature variation and the water vapor content in the gas stream etc. have been eritically studied. With the aid of thermodynamie analyses of the various reactions between HF and the mineral constituents of the alumino-silicate refractories, it has been found possible to satisfactorily explain the mechahism of...

The corrosive action of neutral and reducing gas streams containing HF at high temperatures on fireclay and high-alumina refractories has been investigated. The influences of HF eoncontration, temperature variation and the water vapor content in the gas stream etc. have been eritically studied. With the aid of thermodynamie analyses of the various reactions between HF and the mineral constituents of the alumino-silicate refractories, it has been found possible to satisfactorily explain the mechahism of the corrosive actions.Within the temperature range 500—900℃, it has been found that an increase in temperature is always unfavorable to the corrosive reactions. At temperatures above 700℃, the action of neutral gas streams containing 0.1% HF is very mild on both kinds of refractories. For gas streams containing HF up to 1%, mullite is murh more resistant to attack than eristobalite, especially for temperatures over 700℃. When the HF concentration is increased to 6%, mullite is, however,also severely attacked in the above mentioned temperature range. Gas streams containing water vapor is helpful to minimize the corrosive action of HF gas. Lastly, it is interesting to note that a reducing gas stream, similar in composition to that of blast furnace gas, further supresses the corrosive action of HF in low concentration (0.1%), due probably to some sort of carbon protective film formed on the surfaces of refractory sample grains.

本文研究了含HF的中性与还原性气流在高温下对于粘土砖与高铝氧砖的侵蚀作用。探讨了HF的浓度变化、温度变化及气流中的水蒸气含量变化等因素,对于侵蚀作用的影响。借助于HF气体与矽酸铝耐火材料各个矿物组分间的化学反应的热力学分析,可以较满意地阐明侵蚀作用的机理。 在500~900℃的温度范围内,提高温度不利于侵蚀作用的进行。含HF0.1%的气体,在700℃以上对两种耐火材料的侵蚀均甚轻微。当气流中HF的浓度低于1%时,莫来石抵抗侵蚀的能力,特别在700℃以上,远较方石英为优。当HF的浓度到达6%时,莫来石在上述温度范围内也被严重地侵蚀了。气流中含有水蒸气可以减轻HF的侵蚀作用,类似高炉气的还原性气氛更可使低浓度的HF气体的侵蚀作用大为减弱。

During the smelting of an iron ore containing high fluoride content in a small blast furnace, the hearth refractories were severely corroded. This can be ascribed to the action of very fluid fluoride-containing slags.Moreover, the products of corrosion reactions also have low viscosity which easily flow away from the working face, and leave a new surface fresh for further attack.The stack lining with the same 45%-Al_2O_3 blast furnace brick was, however, in fairly good condition. The chemical analyses...

During the smelting of an iron ore containing high fluoride content in a small blast furnace, the hearth refractories were severely corroded. This can be ascribed to the action of very fluid fluoride-containing slags.Moreover, the products of corrosion reactions also have low viscosity which easily flow away from the working face, and leave a new surface fresh for further attack.The stack lining with the same 45%-Al_2O_3 blast furnace brick was, however, in fairly good condition. The chemical analyses of the inner surface of the brick samples show a high percentage of alkali-,alkaline earth-and fluoride-ion contents. But as the amount of melt formed at the temperatures on these zones is comparatively little, that corrosion is not severe.Minerals identified at the stack lining surface consist of: fluorite, fluoro-biotite, kaliophilitenephelite, leucite, cuspidine and spinels etc. This is the first time that mica minerals have ever been identified in blast furnace linings. It is thought that the formation of fluoro-biotite has fixed a part of the F~-, K~+ or Ca~(2+)-ions, which would otherwise go into the melt. Thus its formation actually exerts some protective action against the corrosion of the stack lining.The higher temperatures prevailing in the bosh region in contrast to the stack caused the formation of a much larger amount of fluoride-containing melt, which is probably responsible for the remarkable degree of Corrosion on the bosh refractories.High temperature experiments carried out in the laboratory on the reactions betwccn CaF_2 and 45%-Al_2O_3 brick powder in closed graphite crucibles throw light to explain the process of corrosion of the furnace lining. Hexagonal anorthite was identified in all of these experimtnts, which has identical optical properties and X-ray diffraction patterns with those of hexagonal anorthite synthesized in our laboratory. It is also interesting to note that these hexagonal anorthites change over to normal triclinic modification under heat treatment at 1000℃ for a period of 24 hours.As a result of this and other previous studies in this laboratory, the appropriate selection of refractory materials for the lining of blast furnaces, smelting iron (?)e containing high fluoride content, is recommended.

在某地高氟含量铁矿石的冶炼过程中,炉缸粘土质高炉砖砖视遭到了极其严重的破坏作用。主要侵蚀介质是含氟炉渣,侵蚀产物容易从砖面流失,因而加速了耐火材料的溶解。在炉身部位发现的矿物是:氟化钙、含氟黑云母、钾和钠的铝矽酸盐、枪晶石及尖晶石等。虽然在砖面附着物中包含着相当数量的氟、硷金属及硷土金属的化合物,但是由于温度较低,只有少量熔体出现,砖衬的损毁情况,并不严重。在高炉砖衬中发现云母矿物,还是第一次。在炉身部位的温度条件下,含氟黑云母具有固定F~-,K~+成Ca~(+2)的能力,对砖机起了保护作用。由于炉腹部位的温度较高,较大量含氟熔体出现,侵蚀就相当显著了。 CaF_2—45%Al_2O_3高炉砖的化学反应实验,可以帮助了解高炉砖视的损毁过程。反应产物中发现有六方钙长石,与实验室合成的六方钙长石具有一致的光学性质和X—射线粉末衍射图型。经过1000℃,24小时热处理后,这种六方钙长石会转变成为三斜晶系变体。 根据两个高炉砖衬的化学-矿物学研究及实验室中辅助研究的结果,对于冶炼高氟含量矿石的高炉砖衬的选择提出了建议。

Considering the experimental methods used and results obtained by previous investigators on the preparation of silicon carbide by gaseous cracking, we have performed our experiments in a similar carbon plate resistance furnace in an atmosphere of hydrogen, argon or nitrogen at temperatures from 1400 to 2200℃. The vapor reacting agents used are either SiCl_4,CH_3SiCl-3, (CH_3)_3SiCl or the mixture of toluene and SiCl_4 or (CH_3)_3SiCl。Having examined carefully under polarising microscope, we revealed with no...

Considering the experimental methods used and results obtained by previous investigators on the preparation of silicon carbide by gaseous cracking, we have performed our experiments in a similar carbon plate resistance furnace in an atmosphere of hydrogen, argon or nitrogen at temperatures from 1400 to 2200℃. The vapor reacting agents used are either SiCl_4,CH_3SiCl-3, (CH_3)_3SiCl or the mixture of toluene and SiCl_4 or (CH_3)_3SiCl。Having examined carefully under polarising microscope, we revealed with no exception that all of the crystal grains of silicon carbide grown over the above-mentioned temperature range contain skeletons of alpha-silicon carbide platelets, with beta-silicon carbide forming a matrix. Intergrowth of the C planes of alpha-silicon carbide with beta-silicon carbide was observed. The twinning angles of the C planes in alpha-silicon carbide crystal were determined to be 37.3°and 70.2°By calculating the temperature dependence of the free energy change of the possible chemical reactions with SiCl_4 in silicon carbide formation, it has been shown that these reactions can be grouped into three catagories: (1) the decomposition of SiCl_4, (2) the decomposition of hydrocarbons or the syntheses of simple hydrocarbons, and (3) various possible reactions leading to silicon carbide formation. The reactions with methyl chlorosilanes as reacting agents have also been discussed.As a consequence of this investigation, the problem of controlling the crystalline modification during the synthesis of silicon carbide monocrystals by the gaseous cracking method is emphasized, and it is believed that the better solution of this problem would be of no less importance than to increase its crystal size or purity.

本文考虑了前人的研究条件和结果之后在类似的碳片炉内进行了裂化法合成碳化硅的实验,反应试剂为SiCl_4、CH_3SiCl_3、(CH_3)_3SiCl或SiCl_4及(CH_3)_3SiCl与甲苯的混合蒸气,气氛为H_2、Ar或N_2,温度为1400~2200℃。岩相法观察表明,在实验温度范围内制备的碳化硅晶粒内都包含α-SiC晶体的片状骨架,它们往往沿C画与β-SiC相间互生:α-SiC晶架的C面孪晶角为37.3°和70.2°;β-SiC则形成基体物质。 化学反应的自由能变化与温度的依赖关系的计算表明,裂化法的化学作用可以概括为以下三类:(1)SiCl_4的分解反应;(2)碳氢化合物的分解或简单碳氢化合物的介成反应;(3)各种可能合成碳化硅的反应。此外,也讨论了氯化硅烷反应剂系统的裂化反应。 根据实验结果,提出了裂化法生长β-SiC单晶的晶型控制问题,并认为解决这;一问题的重要性应不亚于晶体的大小与纯度。

 
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