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model compounds
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  模型化合物
     Studies on the Synthesis, Characterization and Quantum Chemistry of Carbonic Anhydrase Active Site Model Compounds {η~3 - HB(3-Phpz)_3ZnX} (X = Cl~- ,Br~- ,I~- ,NO_3~-)
     碳酸酐酶活性部位模型化合物{η~3-HB(3-Phpz)_3ZnX}(X=Cl~-,Br~-,I~-,NO_3~-)的合成、表征及量子化学研究
短句来源
     Study of the Catalytic Activties of the model Compounds for Cu,Zn SOD in O_2~- Disproportionation
     Cu、Zn-SOD酶模型化合物催化O_2~-歧化作用的研究
短句来源
     The active site model compounds[η3 - HB(3 - Phpz)3ZnX] [X= Cl- (1) ,Br-(2), I-(3), NO3- (4) ] of the carbonic anhydrase have been prepared and characterized by elemental analysis,IR/H NMR spectrum.
     制备了碳酸酐酶活性中心模型化合物{η~3-HB(3-Phpz)_3ZnX}[Ph=苯基,pz=吡唑,X=Cl~-(1),Br~-(2),I~-(3),NO_3~-(4)],通过元素分析,IR,~1HNMR对其结构进行了表征.
短句来源
     The influence of the axial organic base on the electrochemical oxidation and reduction of the coenzyme B1 2 model compounds [R Co(salen) L ],where R=n- C3 H7,i- C4H9; L =H2 O, py,γ- pic was studied by means of cyclic voltammetry.
     用循环伏安法研究了辅酶 B1 2 模型化合物 RCo(salen) L (R=n- C3 H7,i- C4H9;L=H2 O,py,γ-pic)的电化学行为 ,讨论了轴向碱基 L对氧化还原电位的影响。
短句来源
     Synthesis and Characterization of Tyrosinase Model Compounds
     酪氨酸酶活性中心模型化合物的合成与表征
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  “model compounds”译为未确定词的双语例句
     Mossbauer studies on nitrogen fixation model compounds with double-cubane configuration (Et_4N)_ 4[Mo_2Fe_7S_8 (sph) _(12)]
     双立方烷固氮模拟物(Et_4N)_4[Mo_2Fe_7S_8(sph)_(12)]的穆斯堡尔研究
短句来源
     Mossbauer studies on nitrogen fixation model compounds with monocubane configuration [ (Et_4 N) MoFe_3 S_4 (Et_2dtc) 5 ]·CH_3 CN
     单立方烷固氮模拟物(Et_4N)[M_0Fe_3S_4(Et_2dtc)_5]·CH_3CN的穆斯堡尔研究
短句来源
     Results Four model compounds could scavenge O ÷ 2 in the concentration of 10 -5 —10 -6 mol/L and the activity order was as follows: Cu 2+ >Mn 2+ >Co 2+ >Fe 2+ .
     结果  1×10 - 5~ 1× 10 - 6 m ol/ L具有良好的清除 O÷2 作用 ,活性顺序为 :Cu2 +>Mn2 +>Co2 +>Fe2 +;
短句来源
     Progress in Coenzyme NAD(P)H Model Compounds
     辅酶NAD(P)H模型分子的研究进展
短句来源
     Mossbauer spectra of nitrogen model compounds with double-cubane configuration (Et4N)4[Mo2Fe7S8(sph)12] have been measured.
     本实验测定了双立方烷固氮模拟物(Et_4N)_4[Mo_2Fe_7S_8(sph)_(12)]的穆斯堡尔谱。
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  相似匹配句对
     model.
     模型。
短句来源
     Model.
     模型的适用范围。
短句来源
     SYNTHESIS AND PROPERTIES OF HEMOCYANIN MODEL COMPOUNDS
     血蓝蛋白模型化合物的合成和性质
短句来源
     Model Compounds for Investigating the Mechanism of Photoreactivation
     DNA光复活作用机理研究中的模型化合物
短句来源
     The compounds F, G, H and I are novel.
     其中,化合物F、G、H、I为自然界新发现化合物。
短句来源
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  model compounds
Study of the Curing Kinetics for Modified Epoxy Amine Systems Using Model Compounds
      
The effects of flavonols and structurally related model compounds on the formation of the final radiolysis products of ethanol and aqueous ethylene glycol and 2-methoxyethanol solutions were studied.
      
Analysis of the experimental data and quantum-chemical calculations of vibrational spectra for the model compounds are used to identify the IR bands.
      
The oxidation of model compounds was studied, and experimental evidence for the proposed mechanism was obtained.
      
The quantitative characteristics of carbonization of the model compounds are influenced by the nitrile group.
      
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The characteristic infra-red absorption bands for the cis- and trans-forms of the polyester from maleic anhydride-ethylene glycol have been identified by comparison with the absorption bands of the corresponding model compounds, i.e., diethyl maleate and diethyl fumarate: Cis-form—825, 1410, 3052 cm~(-1); trans-form—780, 1371, 3072 cm~(-1). The ratio of the optical densities of the 825 and 780 cm~(-1) bands has been chosen for the determination of the ratio of cis-.and trans-forms present in the polyester....

The characteristic infra-red absorption bands for the cis- and trans-forms of the polyester from maleic anhydride-ethylene glycol have been identified by comparison with the absorption bands of the corresponding model compounds, i.e., diethyl maleate and diethyl fumarate: Cis-form—825, 1410, 3052 cm~(-1); trans-form—780, 1371, 3072 cm~(-1). The ratio of the optical densities of the 825 and 780 cm~(-1) bands has been chosen for the determination of the ratio of cis-.and trans-forms present in the polyester. Increased temperature and duration of polyesterification increased the trans-content of the polyester obtained. The cis-trans isomerization reaction has been shown to be a first order reaction with an activation energy of 19 kcal/mole. The large increase of viscosities of reaction mixture during polyesterification of maleic anhydride and ethylene glycol is mainly due to the increase of trans-content of the polyester formed.

1.以顺式和反式丁烯二酸二乙酯为模型化合物,确定表征聚酯中顺、反构型的红外光谱特征吸收带。顺式为825,1410和3052厘米~(-1),反式为780,1371和3072厘米~(-1)。 2.测定一系列顺式聚酯和反式聚酯混合弑样在825和780厘米(-1)的光密度比值,得到可以定量顺、反构型的工作曲线。 3.缩聚反应温度和反应时间对顺-反异构化有显著的影响。提高温度和延长反应时间都会增加聚酯中反式构型的含量。顺-反异构化反应系属一极反应,反应活化能为19千卡/克分子。 4.在顺丁烯二酸酐和乙二醇的缩聚过程中反式构型的增多是聚合物粘度增大的主要因素。

In relation to the graft copolymerization of cellulose using Ce4+ as catalyst, the mechanism of cellulose oxidation and the reaction sites on the cellulose macromolecular chain in Ce4+-H2O-cellulose system were studied.From the experimental data concerning the rate of reduction of Ce4+ to Ce3+ in aqueous solution, the photosensitive character of this system has been confirmed.From the rates of oxidation of cellulose and its related model compounds, such as hydrocellulose, cellobiose, dialdehydecellulose,...

In relation to the graft copolymerization of cellulose using Ce4+ as catalyst, the mechanism of cellulose oxidation and the reaction sites on the cellulose macromolecular chain in Ce4+-H2O-cellulose system were studied.From the experimental data concerning the rate of reduction of Ce4+ to Ce3+ in aqueous solution, the photosensitive character of this system has been confirmed.From the rates of oxidation of cellulose and its related model compounds, such as hydrocellulose, cellobiose, dialdehydecellulose, glucose and methylglucoside, as determined in eerie salt solution, the kinetics of cellulose oxidation may be represented by the following equation:where [Ⅰ]0, [Ⅱ]0 and [Ⅲ]0 are the initial concentrations of the functional groups of type Ⅰ, Ⅱ2 and Ⅲ, and kⅠ, kⅡ and kⅢ are their reaction rate constants respectively.By determining and comparing the rate constants of the same type but of different cellulose model compounds, it was found that the values of k for the same functional group are approximately equal irrespective of the model compounds to which the particular type of functional group is attached. It was also confirmed that there are at least three oxidation sites on a cellulose macromolecular chain. The sites of greater and medium reactivity are the aldehyde group and 5,6-glycol unit of the terminal anhydroglucose unit respectively. The least reactive site is the hydroxyl groups attached to the third position of the rest of anhydroglucose rings. Though the value of km is very small, nevertheless, the reaction of third position should not be neglected for the number of such hydroxyl groups is great.When cellulose is oxidized by eerie salt, it was found that one mole of terminal aldehyde group or 5,6-glycol unit consumes two moles of eerie salt and was finally converted into new aldehyde group. Cellulose free radical formed as an intermediate product initiates the graft copolymerization. Hence, it may be assumed that the copolymer of cellulose obtained by Ce4+ initiation is possibly a graft-block complex copolymer.

从高铈盐水溶液分解动力学角度进一步确定了反应体系的光敏性质。 从水解纤维素、纤素二糖、二醛基纤维素、葡萄糖、葡萄糖甲甙等纤维素模型化合物在高铈盐溶液中的氧化动力学,确定了作为含有多种官能团的高聚物纤维素的氧化动力学方程式是: -(d[Ce~(4+)]/dt)=(k_Ⅰ[Ⅰ]_0+k_Ⅱ[Ⅱ]_0+k_Ⅲ[Ⅲ]_0+……)[Ce~(4+)]其中,[Ⅰ]_0、[Ⅱ]_0和[Ⅲ]_0分别为纤维素中第1、2和3官能团的初始浓度。k_Ⅰ、k_Ⅱ和k_Ⅲ分别为它们的反应速率常数。 不同模型化合物中相同官能团速率常数的对比,确定了速率常数的归属。k_Ⅰ、k_Ⅱ分别为巨分子端基环上的潜醛基和 5、6-乙二醇单元的反应速率常数。证明在纤维素巨分子中至少有三个氧化反应部位。 纤维素巨分子经高铈盐氧化时,每个潜醛基或5、6-乙二醇单元各消耗二个高铈离子,最后都转变为醛基。在消耗一个高铈离子时,可以生成中间络合物——巨分子自由基。自由基位于末端基环的第2位和第5位碳原子上。 第三反应部位位于中间基环上,其反应速率常数虽小,但由于含量很多,故其反应速率不容忽视。第三反应部位的精确位置现尚无法肯定。 用高铈引发所得共聚物主链没有明显的裂...

从高铈盐水溶液分解动力学角度进一步确定了反应体系的光敏性质。 从水解纤维素、纤素二糖、二醛基纤维素、葡萄糖、葡萄糖甲甙等纤维素模型化合物在高铈盐溶液中的氧化动力学,确定了作为含有多种官能团的高聚物纤维素的氧化动力学方程式是: -(d[Ce~(4+)]/dt)=(k_Ⅰ[Ⅰ]_0+k_Ⅱ[Ⅱ]_0+k_Ⅲ[Ⅲ]_0+……)[Ce~(4+)]其中,[Ⅰ]_0、[Ⅱ]_0和[Ⅲ]_0分别为纤维素中第1、2和3官能团的初始浓度。k_Ⅰ、k_Ⅱ和k_Ⅲ分别为它们的反应速率常数。 不同模型化合物中相同官能团速率常数的对比,确定了速率常数的归属。k_Ⅰ、k_Ⅱ分别为巨分子端基环上的潜醛基和 5、6-乙二醇单元的反应速率常数。证明在纤维素巨分子中至少有三个氧化反应部位。 纤维素巨分子经高铈盐氧化时,每个潜醛基或5、6-乙二醇单元各消耗二个高铈离子,最后都转变为醛基。在消耗一个高铈离子时,可以生成中间络合物——巨分子自由基。自由基位于末端基环的第2位和第5位碳原子上。 第三反应部位位于中间基环上,其反应速率常数虽小,但由于含量很多,故其反应速率不容忽视。第三反应部位的精确位置现尚无法肯定。 用高铈引发所得共聚物主链没有明显的裂解,自由基的可能位置表明它可能是接枝-嵌段复合共聚物。

The mechanism of solution polycondensation of MDI with TMA was preliminarily studied with model compound, by means of Semi-quantitative analysis of infra-red spectroscopy and viscosity. It is found that the polycondensation is an irreversible reaction and its important characteristic is that amido and imido groups are formed at the same time. The viscosity of the solution increases with the increasing of MDI in excess and eventually gelation takes place. All the solvents which contain active hydrogen or...

The mechanism of solution polycondensation of MDI with TMA was preliminarily studied with model compound, by means of Semi-quantitative analysis of infra-red spectroscopy and viscosity. It is found that the polycondensation is an irreversible reaction and its important characteristic is that amido and imido groups are formed at the same time. The viscosity of the solution increases with the increasing of MDI in excess and eventually gelation takes place. All the solvents which contain active hydrogen or unshared electrons are not suitable for this reaction due to the possibility of addition reaction with MDI. When the water content of the solvent used is over 0.16%, the polycondensation reaction can not normally proceed. Because of the absence of labile polyamide-acid and only CO2 evolving during the polycondensation, the storage stability of the condensation solution shows good.The high temperature treatment of the polycondensate induces the further completion of imidezation and changing of the structure of molecular aggregation, and thus causes the molecular weight to increase continuously. The addition of a certain amount of epoxide resin of low molecular weight into the polyconsation system not only reduces the fabrication temperature of the PAI about 80℃, but also improves both the property of film formed and its storage stability.

本工作用有关模型化合物、红外分析和ln η_r/C初步研究了MDI与TMA溶液缩聚反应机理,发现反应是一个单向缩聚反应,它的重要特征是酰胺与酰亚胺基团同时形成。在反应中随着MDI的过量溶液粘度随之增加以致成为胶冻,凡带活泼氢或含未共事电子的溶剂因可能与MDI加成而不适用,当溶剂的水份>0.16%时,缩聚反应不能正常进行,由于反应中不产生易降解的聚酰胺酸,仅选出CO_2,故缩聚液的贮存稳定性较好,缩聚产物的高温热处理起着继续增长分子量,补充酰亚胺化和改变序态结构的作用。在缩聚体系里加入适量的低分子环氧树脂可使PAI的成型温度约降低80℃。

 
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