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二级
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  second order
    THEORETICAL ANALYSIS OF TPD SPECTROGRAM OF SECOND ORDER DESORPTION KINETICS
    二级脱附反应TPD谱图剖析
短句来源
    Studies on Thermokinetics(Ⅴ)——Thermokinetic Method for the Second Order Reactions
    热动力学的研究(Ⅴ)——二级反应的热动力学研究法
短句来源
    The Determination of Second Order Rate Constant of the Reaction Between O(~3p) and Cyclopentanone
    O(~3P)原子与环戊酮的二级反应速率常数测定
短句来源
    Thermokinetics Study of Unequal Concentration Second Order Reactions-Ring-Ppening Reaction of Epichlorohydrin
    不等浓度二级反应的热动力学研究——环氧氯丙烷开环反应
短句来源
    STUDIES ON THERMOKINETICS-(IX)—ABOUT THERMOKINETIC METHOD FOR SECOND ORDER REACTIONS
    热动力学研究(Ⅸ)——关于二级反应的热动力学研究法
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    A Study of Deviation Two-order Reaction on Soap Reaction of Acetoacetyl
    乙酸乙酯皂化反应偏离二级反应行为的研究
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    STUDIES ON FRAGMENTATION OF PHILLIPS TYPE Cr_2O_3/SiO_2 CATALYST DURING ETHYLENE POLYMERIZATION
    菲利浦型Cr_2O_3/SiO_2催化剂二级颗粒分裂模式的研究
短句来源
    Studies on Adiabatic Thermokinetics Ⅲ. Thermokinetic Research of Second-Order Reactions
    绝热式热动力学的研究——Ⅲ.二级反应的热谱解析
短句来源
    KINETICS OF DIFFUSION WITH CHEMICAL REACTIONS IN GELATIN LAYER (Ⅱ) NUMERICAL MODELING OF DIFFUSION WITH A SECOND-ORDER REACTION
    明胶层中的扩散和反应的动力学研究 (Ⅱ)扩散伴随二级反应的动力学模型
短句来源
    Artificial Intelligence Interpretation of Organic Mass Spectra-Two Level Group Classification With Z_i/Z_T Value and Its Application in Environmental Pollution Compounds
    有机质谱人工智能解释——Z值二级族分类及在环境污染物质谱解释中的应用
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  second order
Behavior near the boundary of positive solutions of second order parabolic equations
      
We state a localization principle for expansions in eigenfunctions of a self-adjoint second order elliptic operator and we prove an equiconvergence result between eigenfunction expansions and trigonometric expansions.
      
We also obtain a way of constructing an arbitrary number of non-Gaussian continuous time processes whose second order properties are the same as those of fractional Brownian motion.
      
The line search functions used are Han's nondifferentiable penalty functions with a second order penalty term.
      
Finally, we prove the global convergence and the local second order convergence of the algorithm.
      
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The softening point and Young's modulus of polymethylmethacrylate at low temperature with various contents of dibutyl phthalate have been measured by using a consistometer and a dilatometer respectively. The relationship between the molar con- centration of dibutyl phthalate, N, and the softening point, T, can be expressed by the equation T=112-947N. An explanation for the difference between the coefficient 947 and the value 228-232, previously obtained by Zhurkov, is suggested. The addition of 1% or more dibutyl...

The softening point and Young's modulus of polymethylmethacrylate at low temperature with various contents of dibutyl phthalate have been measured by using a consistometer and a dilatometer respectively. The relationship between the molar con- centration of dibutyl phthalate, N, and the softening point, T, can be expressed by the equation T=112-947N. An explanation for the difference between the coefficient 947 and the value 228-232, previously obtained by Zhurkov, is suggested. The addition of 1% or more dibutyl phthalate substantially improves the low temper- ature impact strength of polymethylmethacrylate, but it shows no appreciable change in Young's modulus at room temperature with 1-5% dilbuytl phthalate.

測定了不同苯二酸二丁酯含量的聚甲基丙烯酸甲酯的軟化温度、二級轉變温度和低温彈性模數,得出苯二酸二丁酯含量和軟化温度的關係式:T=112-947N。並從低温彈性模數說明添加苯二酸二丁酯後改進了聚甲基丙烯酸甲酯的低温度衝擊強度。

The reaction of quinoline-methyl iodide in salicylic aldehyde has been studied by conducto-metric method,The second order velocity constants of the reaction have been found asfollows:4. 37×10~(-3) liter per mole per minute at 25℃ 9. 57×10~(-3) at 35℃,and 19. 8×10~(-3)at 45℃ respectively.The value of the activation energy of the reaction has been determined tobe 14,200 cal.per mole,and that of the entropy of activation,-32. 0 cal.per mole per degreeat 45℃.

喹啉-碘甲烷在水杨醛中的反应为二级反应。它的反应速度常数 k25°时为4. 37×10~(-3) ,35°时为9. 57×10~(-3) 及45°时为19. 8×10~(-3) 升/克分子·分。反应的活化能为14,200卡/克分子。45°时的活化熵为-32. 0卡/克分子·度。

Although esterification reaction betweea monobasic acids and mouohydric alcohols is a well-known chemical reaction,on which various authors,such as Goldschmidt,Hinshelwood,Flory and others,have done much work,but the mechanism of esterification and the order of the reaction in the absence or presence of a foreign acid remain unclarified.For this purpose we have studied the kineties of esterification reactions between laurie acid and normal octyl alcohol with equi-or non-eqnimolar quantity ratios in the absence...

Although esterification reaction betweea monobasic acids and mouohydric alcohols is a well-known chemical reaction,on which various authors,such as Goldschmidt,Hinshelwood,Flory and others,have done much work,but the mechanism of esterification and the order of the reaction in the absence or presence of a foreign acid remain unclarified.For this purpose we have studied the kineties of esterification reactions between laurie acid and normal octyl alcohol with equi-or non-eqnimolar quantity ratios in the absence or presence of a foreign acid at different temperatures.According to our experimental data,we propose the following mechanism for the esterification reaction between monobasic acids and monohydri calcohols:

本文建议一种新的酯化反应的氢离子催化机构,这机构与公认的酯化反应的氢离子催化机构的区别在于氢离子的来源和氢离子参与反应的详细历程,肯定氢离子不仅由外酸供给,而且也可由单元酸本身电离得来,另外,单元酸和单元醇都可作为氢离子的载体。酯化反应的功力学方程与单元酸和单元醇起始的克分子比有密切关系,应由(3)式表示。当酸与醇以等克分子比起反应,在无外酸作催化剂时,酯化反应是2(1/2)级反应;若有外酸作催化剂,当外酸的量加得适当多,由单元酸本身供给的氢离子的贡献可以忽略时,是二级反应;当外酸的量加得少,由单元酸本身供给的氢离子的贡献不可以忽略时,它不再是二级反应。当酸与醇以不等克分子比起反应,动力学方程比较复杂,实验结果亦与理论相一致。这样,我们用同一反应机构解释所有不同克分子比的单元酸与单元醇的酯化反应的实验数据。

 
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