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kinetic mechanisms
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  动力学机制
     Study on the Kinetic Mechanisms of Dissolution and Transformation of 2MgO·2B 2O 3·MgCl 2·14H 2O
     2MgO·2B_2O_3·MgCl_2·14H_2O溶解及相转化的动力学机制研究
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     Study on Structural and Kinetic Mechanisms and Quantitative Patterns of T Cell Specific Recognition
     T细胞特异性识别的结构动力学机制和数量模式研究
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     Thus, the kinematic and kinetic mechanisms fortremolite-talc retrogressive reaction were explored and a theory of topotacticreaction sequence has been proposed.
     探讨了透闪石退变质为滑石的反应运动学和反应动力学机制; 提出了拓扑定向反应系列的理论。
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     The kinetic mechanisms of dissolution and crystallization reactions have been confirmed according to order reaction, activation energy and effect of stirring.
     依据反应级数、活化能及搅拌效应,确定了该复盐的溶解和转化结晶反应动力学机制
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     It is believed that Chaidamu basin has different kinetic mechanisms and tectonic settings in Early-Middle Jurassic and Late Jurassic, with the former being a weak relaxed extensional tectonic setting, while the latter being a weak compressional tectonic setting.
     ②柴达木盆地在早中侏罗纪与晚侏罗纪有不同的成盆动力学机制与成盆构造背景:前者是弱松弛伸展环境,后者形成在弱挤压构造环境。
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  “kinetic mechanisms”译为未确定词的双语例句
     Popescu Method for Combustion Kinetic Mechanisms of Coals
     利用Popescu法对煤燃烧反应机理的研究
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     In main reaction region the kinetic equation is 1- (1-α) = kt and apparent acti-vation energy is 270 kJmol -1. The kinetic mechanisms from isothermal and non - isothermal methcxl are not different, and the value of activation energy is approximately the same.
     中期主体反应阶段的动力学方程是1-(1-α)=kt,表观活化能为270kJmol(-1)。
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     The kinetic mechanisms for the extraction of active constituents in dissimilar plants Lycoris radiata and Rhizma polygoni cuspidati by microwave-assisted extraction(MAE) were investigated. Lycorine,lycoramine and galanthamine in Lycoris radiate,resveratrol and emodin in Rhizma polygoni cuspidati were target constituents.
     以鳞茎药材石蒜(Lycoris radiata)和根茎药材虎杖(Rhizma Polygoni Cuspidati)作为研究对象,采用微波辅助提取(MAE)石蒜中的石蒜碱、力可拉敏和加兰他敏以及虎杖中的大黄素和白藜芦醇,研究了提取过程的动力学机理。
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     The Thermodynamic and Kinetic Mechanisms of the Process of the Flux Refinement of Al Alloys
     铝熔体熔剂精炼的热力学及动力学分析
短句来源
     Kinetic Mechanisms for the Extraction of Active Constituents in Lycoris Radiata and Rhizma Polygoni Cuspidati by Microwave-assisted Extraction
     微波辅助提取石蒜和虎杖中有效成分的动力学机理
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  相似匹配句对
     On Mechanisms
     机制论
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     With the help of kinetic analysis,the reaction mechanisms were discussed.
     由这些分析结果出发进行氧化锌铋系颜料合成的初步的热力学与动力学探讨。
短句来源
     Popescu Method for Combustion Kinetic Mechanisms of Coals
     利用Popescu法对煤燃烧反应机理的研究
短句来源
     The mechanisms of desulfurizationwith T.
     T.
短句来源
     the kinetic equations are derived;
     推导了有限元动力方程;
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  kinetic mechanisms
Various possible kinetic mechanisms, ensuring the existence of a stationary state of the adiabatically enclosed plasma, are considered.
      
Kinetic mechanisms of polymerization of butyl acrylate in the presence of porphyrin cobalt during induction
      
1.We studied the kinetic mechanisms in the linear oligomerization of butadiene and butadiene-d6 by the use of complex catalysts containing iron and cobalt.
      
In this study, the degree of dissociation and recombination of oxygen atoms produced by a microwave discharge in oxygen is examined by comparing a theoretical model of the kinetic mechanisms to chemical titration data.
      
Nevertheless, embryo chick retina accumulated [3H]taurine by two different kinetic mechanisms withKms of 242 μM and 21 μM for the low- and high-affinity processes, respectively.
      
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A mechanism of ammonia-synthesis reaction on doubly-promoted iron catalysts has been proposed, together with the derivation of the kinetic equation, based upon the model of active-centre described in the first article, and other known experimental facts, such as infrared absorption spectroscopy of adsorbed N2 and the partially-hydrogenated intemediates, the FEM, LEED rcsuls, the 15N2-14N2 isotopic exchange, the inverse isotope-effect of D2 on rate of ammonia-synthesis reaction, the stoichiometric...

A mechanism of ammonia-synthesis reaction on doubly-promoted iron catalysts has been proposed, together with the derivation of the kinetic equation, based upon the model of active-centre described in the first article, and other known experimental facts, such as infrared absorption spectroscopy of adsorbed N2 and the partially-hydrogenated intemediates, the FEM, LEED rcsuls, the 15N2-14N2 isotopic exchange, the inverse isotope-effect of D2 on rate of ammonia-synthesis reaction, the stoichiometric number, and the effect of hydrogen on adsorption and rate of formation of ammonia.The kinetic expression and the essential steps of derivation are the same as that given by in 1963, but there is one important difference in kinetic mechanism, together with difference in physical meaning of some microscopic parameters. Instead of assuming that adsorbed N2 reacts with gaseous H2 as proposed by , it is assumed in the present article, that the reaction between adsorbed N2δ and adsorbed H6+ (or H2δ+) is one of the rate-controlling steps.A critical review of the internationally more popularly accepted kinetics equations for amonia synthesis reaction on iron catalysts is also given.Based upon the kinetic equatien thus derived, treatment of the experimental kinetic data given by Ozaki and Taylor (1960) is shown to give exellcnt agreement between theory and experiment. The inversed isotope-effect on reaction kinetics is explained as the commulative effect of the thermodynamic factor (KND3>KNH3,KD2)>KH2) and the kinetic factor [(k2)D>(k2)H], without reserving to the disputable assumption of NH as the predomincnt adsorption speiccs.

在前文的基础上,根据红外吸收光谱,场离子质谱,俄歇电子能谱,低能电子衍射,吸附后金属输出功增量,~(15)N_2-~(14)N_2同位素交换,D_2对氨合成反应速率的反同位素效应,氢对氮吸附量、吸附速度、氨生成速度的影响,同位素方法测出的化学计量比等方面的实验事实,以及量子化学计算结果,提出在铁催化剂上氨合成的催化作用机理,并推导出相应的动力学方程式。这方程形式上与1963年推广式一致,但动力学机理与微观参数物理化学意义不同。本文不主张气相H_2分子与吸附氮作用而主张吸附的N_2δ~-与诱生吸附的H~δ~+(或H_2δ~+)相作用,为速率控制步骤之一,从而较好地解释氮解离的化学推动力。同时,说明了N_2与H_2不互相竞争吸附位的微观原理。综合评论了国际上主要的氨合成动力学方程式及其互相间的联系。 根据本文推得的动力学方程,将0zaki-Taylor实验数据重新处理,结果表明本文方程与实验值符合程度更好。例如,由该方程处理实验数据求得的动力学参数a与压力的关系,αH/αD随温度变化的关系,都与理论估计符合。本文还求得某些新的动力学参数,并讨论其物化涵义。结果表明,D_2对氨合成反应速率的反同位素效应是热力学因素...

在前文的基础上,根据红外吸收光谱,场离子质谱,俄歇电子能谱,低能电子衍射,吸附后金属输出功增量,~(15)N_2-~(14)N_2同位素交换,D_2对氨合成反应速率的反同位素效应,氢对氮吸附量、吸附速度、氨生成速度的影响,同位素方法测出的化学计量比等方面的实验事实,以及量子化学计算结果,提出在铁催化剂上氨合成的催化作用机理,并推导出相应的动力学方程式。这方程形式上与1963年推广式一致,但动力学机理与微观参数物理化学意义不同。本文不主张气相H_2分子与吸附氮作用而主张吸附的N_2δ~-与诱生吸附的H~δ~+(或H_2δ~+)相作用,为速率控制步骤之一,从而较好地解释氮解离的化学推动力。同时,说明了N_2与H_2不互相竞争吸附位的微观原理。综合评论了国际上主要的氨合成动力学方程式及其互相间的联系。 根据本文推得的动力学方程,将0zaki-Taylor实验数据重新处理,结果表明本文方程与实验值符合程度更好。例如,由该方程处理实验数据求得的动力学参数a与压力的关系,αH/αD随温度变化的关系,都与理论估计符合。本文还求得某些新的动力学参数,并讨论其物化涵义。结果表明,D_2对氨合成反应速率的反同位素效应是热力学因素(K_(ND_3)>K_(NH_3),K_(D_2)>K_(H2))以及动力学因素[(k_2)_D>(k_2)_H]的加和,而不是Ozaki所提出的

The natural insecticidal pyrethrins and synthetic pyrethroid erters are powerful insecticides. The potencies of pyrethroids are very sensitive to the structure and chirality of the acidic and alcoholic components. This paper reviews the relationships between biological activity and absolute comformation of pyrethroids, the methods of analysis and separation of geometric and optical isomers, the kinetic mechanism of metabolism of pyrethroid stereoisomers, and finally discusses how to synthesize the stereospecific...

The natural insecticidal pyrethrins and synthetic pyrethroid erters are powerful insecticides. The potencies of pyrethroids are very sensitive to the structure and chirality of the acidic and alcoholic components. This paper reviews the relationships between biological activity and absolute comformation of pyrethroids, the methods of analysis and separation of geometric and optical isomers, the kinetic mechanism of metabolism of pyrethroid stereoisomers, and finally discusses how to synthesize the stereospecific pyrethroids.The chromatographic methods for analysis and separation of stereoisomer of pyrethroids offer distinct advantages, such as small sample size,and high resolution for maderatescale separations and final products.

天然除虫菊素和人工合成的拟除虫菊酯是一类高效、低毒的杀虫剂。它们的化学结构,特别是立体构型对其生物学活性具有决定性的影响。 本文综述除虫菊农药的绝对构型与生物学活性之间的关系,测定和拆分除虫菊农药几何异构体和光学异构体的方法,除虫菊农药酶代谢的动力学机制,并讨论了化学合成立体特异性高效除虫菊酯的可能性。 文中所述测定和拆分除虫菊农药的色谱方法具有样品用量少、拆分效率高和分离产物纯等优点。

Based on the summation and theoretical analysis of the known corresponding experimental facts, the most possible active lattice phase for the dehydrogenation of ethylbenzene to styrene over potassium promoted iron oxide has been discussed, and a model of active center (a cluster consists of one potassium, two iron and one oxygen), modes of reaction transition states and kinetic mechanism have been proposed. The mechanism is as follows: Ethylbenzene is on(u1-η6) coordinated on Fe(2-3)+ ion center,...

Based on the summation and theoretical analysis of the known corresponding experimental facts, the most possible active lattice phase for the dehydrogenation of ethylbenzene to styrene over potassium promoted iron oxide has been discussed, and a model of active center (a cluster consists of one potassium, two iron and one oxygen), modes of reaction transition states and kinetic mechanism have been proposed. The mechanism is as follows: Ethylbenzene is on(u1-η6) coordinated on Fe(2-3)+ ion center, then the α-H of adsorbed ethylbenzene is removed on the negative oxygen ion of Fe-O to form benzene-propenyl radical and -OH group by means of super-hyperconjugation, at last, the β-H of benzene-propenyl is attached to the neigboring Fe(2-3)+ ion and is transformed to adsorbed styrene and Fe-H. In this article, the oxygen free radical mechanism of by-product formation is also proposed and K2O presents the effects of inhibiting oxygen free radical and to stabilize the active phase, thereby, increase's the number of active center. To give further support to above views, a quantum chemistry calculation is made by using.EHMO charge self-consistent method, the results of calculation demonstrate that the adsorption energies of various transition states, the electron transfer of surface reaction .and the change of oxidation valence of iron ions accompanying adsorption and surface reaction, are reasonably in agreement with the proposed mechanism.

提出了催化剂的活性相组成、乙苯脱氢生成苯乙烯的活性中心模型和在此模型上催化作用的微观机理;同时提出了副反应的氧自由基机理,以及氧化钾助催剂对抑制副产物与稳定活性相的作用。EHMO近似量子化学计算的结果表明了所提出的乙苯脱氢机理,以及关于吸附能量、决定性步骤、活化能、电子迁移和铁离子价态的变化等是合理的。

 
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