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electrostatic effects
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  静电作用
     It was showed that hydrophobic (hydrophilic), electrostatic effects are important for the retention behaviour and resolution of the compounds investigated on the newly synthesized chiral column.
     实验结果表明,在反相条件下,疏水(亲水)作用、静电作用对手性化合物在柱上的保留以及对映体的拆分起到了非常重要的作用;
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  静电效应
     Cu(Ⅱ) complex of poly(4-vinylpyridine) partially quaternized by ethyl bromide (EBQP4VP) possesses the character of oxidase analogue. Oxidation of hydroquinone catalyzed by this complex at 25℃ exhibits a typical Michaelis-Menten kinetic behavior. The molecular chain conformation and electrostatic effects of the complex vary with the variations of "static"-microchemical environment and "dynamic"-solution condition.
     用溴乙烷部分季胺盐化的聚4-乙烯基吡啶(EBQP4VP)-Cu(Ⅱ)络合物具有类氧化酶特性,它在25℃下催化氢醌的氧化反应是典型的 Michaelis-Menten型动力学行为,络合物分子链的构象和静电效应随“静态”-微化学环境和“动态”-溶液条件变化而异。
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  “electrostatic effects”译为未确定词的双语例句
     After a comnarison betxveen the electrostatic effects and the orbitaleffects,a more detailed understanding of the CO/NiO( 1 00)chemisorption mechanism isobtained.
     比较表面电场作用与轨道作用对CO性质的影响,并考虑到BSSE校正,对CO在NiO(l00)面上的吸附行为有了较深入的认识。
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     The effect mechanism can be summarized as thermal insulation effects, electromagnetic field effects, electrostatic effects and magnetic effects generated by current.
     其作用机理可概括为“绝热效应”、“电磁辐射场作用”、“静电场作用”和电流产生的磁场效应。
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     Based on the electrostatic effects of the alkyl R and the substituent X, combining the polarizability ef- fect index PEI(R) of alkyl R and the electronegativity χx of substituent X, the interaction of R and X in monosubsti- tuted alkane RX was quantified.
     根据烷基R和取代基X(Cl、Br、I、OH、SH、NO2、CN、NH2、CHO和COOH等)本身的电子效应,应用烷基R的极化效应指数PEI和取代基X的电负性!
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  相似匹配句对
     The effects of G.
     而G.
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     The Effects of Electrostatic Discharge on Human Body
     静电放电(ESD)对人体的影响
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     Effects of Electrostatic Field on Bafley Seeds
     电场对作物种子影响的研究
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     The effects of N and P were strong.
     不同营养障碍使铃重有不同程度的降低 ,其中以 N、P营养影响最大 ;
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     Electrostatic oiling
     钢板表面涂油新方法——静电涂油
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  electrostatic effects
Electronic structure of long polyene chains with consideration of long-range electrostatic effects and the influence of the term
      
electrostatic effects in the nucleophilic addition to (4R,6S)-4-(tert-butyldimethylsiloxy)-2,2,6-trimethylcyclohexanone (1), a well-known chiral building block, is investigated.
      
electrostatic effects in the nucleophilic addition to a hindered cyclohexanone
      
Electrostatic effects in the magnetic screening of19F in alkali-metal fluorides
      
This correlation is possible only in the absence of electrostatic effects due to the presence of PEG.
      
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Even though in the application of adsorption to industry or research one almost never deals with solutions containing only a single solute, yet the number of investigations on the adsorption from mixed solutions is very limited. Following the lead of Freundlich the generally held opinion is that the effect of one adsorbate on the adsorption of another is simple displacement. While this may be true for some special cases, it is undoubtedly too simple to be of general validity, because the various interactions,...

Even though in the application of adsorption to industry or research one almost never deals with solutions containing only a single solute, yet the number of investigations on the adsorption from mixed solutions is very limited. Following the lead of Freundlich the generally held opinion is that the effect of one adsorbate on the adsorption of another is simple displacement. While this may be true for some special cases, it is undoubtedly too simple to be of general validity, because the various interactions, such as solid-solvent, solute-solute, solute-solvent, have been neglected in this theory. In the theoretical study of chromatography it is necessary to know the equation for the adsorption isotherm when more than one solute are present in the solution. The most widely adopted equation for this purpose is (x/m)_a=k'_aC_a/(1+k_iC_i) (1) This equation can be easily derived from that for a single adsorbate: x/m = k'C/ (1+kC) (2) by assuming that the presence of an additional solute merely reduces the available surface area of the solid. Formally, this equation is analogous to that of Langmuir for the adsorp- tion of gaseous mixtures, replacing pressures by concentrations, but it is actually an empirical equation, because the numerical values of the k's can be obtained only from experimental data and their physical significance is not at all clear. This equation predicts the de-pression of the adsorption of one solute by another. While it is in line with the current idea, there is no experimental proof of its validity. It is the dual purpose of the present investigation to substantiate or disprove the dis- placement theory and to test the applicability of equation (1). We have studied the adsorption from binary solutions of hydrochloric, acetic, and oxalic acids by sugar char. The adsorbates are chosen because of their widely different strength. Sugar char is chosen because it has been shown from previous studies that with this adsorbent the experimental data for single adsorbate follow equation (2). The experimental results are given below: HCl-CH_3COOH and CH_3COOH-H_2C_2O_4 systems: (1) The adsorption of any acid is less than when it is present alone; (2) When the corresponding (x/m)'s are plotted, straight lines with negative slopes are obtained; (3) The slopes of these straight lines vary with the concentration of the acid being displaced; (4) The order of the displacing power, measured by the slope, is HCl> CH_3COOH > H_2C_2O_4, while the order of adsorption is just the reverse; (5) Equation (1) is not valid. HCl-H_2C_2O_4 system: (6) The adsorption of HCl is decreased; (7) When its concentration is higher than about 0.005 N, the adsorption of oxalic acid is increased; at lower concentrations the adsorption is decreased; (8) The higher the concentration of HCl is, the more pronounced will be the increase of adsorption of oxalic acid; (9) Corresponding (x/m)'s give straight lines whose slopes change sign as C_ox increases beyond 0.005 N. From (3) and (4) it is concluded that the observed decrease of adsorption is not due to simple displacement. Based on the hypothesis that it is primarily the solvent which is displaced with the subsequent shift of equilibrium, a mechanism is proposed to account for the effect of one solute on the adsorption of another, which seems to agree with all the observed results. The increase of the adsorption of oxalic acid disproves conclusively the displacement theory. The fact that there is a critical concentration below which the adsorption of oxalic acid is decreased indicates that there are two opposite influences at work. It is suggested that three factors contribute to the increase of adsorption of oxalic acid: (a) the decrease of dissociation; (b) the lowering of solubility; and (c) electrostatic effect. To determine the relative importance of these factors requires further investigation. Finally, an empirical equation involving three constants has been derived to represent the adsorption of oxalic acid in the presence of hydrochloric acid.

在此工作中我們研究了三種混合酸的吸附。在鹽酸-酸的體系中,鹽酸增加糖炭對於草酸的吸附量,倘若草酸的濃度超過0.005N。這個事實否定了在混合酸中各溶質間的作用是彼此頂替的說法。在醋酸-草酸及醋酸-鹽酸的混合溶液中,各酸的吸附量皆較其單獨存在時低。根據實驗的數據我們指出了各家說法的可疑之點。我們認為在混合溶液中吸附量之減少主要是因為溶質甲頂替了表面上的溶劑,因而使溶質乙的吸附量降低。若是溶質甲能使溶質乙的電離度或溶度降低,或增加溶質乙的Gegen-ion,則能使乙的吸附量增加。因為Langmuir式的混合吸附公式不能代表吸附之增加,我們提出了一個可以此較滿意的代表實驗結果的三常數經驗公式。各溶質的吸附量皆成直線關係。對此結果我們不能作定量的解釋,雖然此種現象與我們的假設並不矛盾。

Mixed ligand complexes are commonly formed in natural and biological fluids where various metal ions interact with various potential ligands. The formation of mixcd ligand complex may either obtained through simultaneous formation, stepwice formation or reproportionation.The Stabilization of the mixed species is considerably influenced by statistical effect, electrostatic effect, steric effect, cooprerative effect and covalency of the coordination bond. In biological systems mixed chelate...

Mixed ligand complexes are commonly formed in natural and biological fluids where various metal ions interact with various potential ligands. The formation of mixcd ligand complex may either obtained through simultaneous formation, stepwice formation or reproportionation.The Stabilization of the mixed species is considerably influenced by statistical effect, electrostatic effect, steric effect, cooprerative effect and covalency of the coordination bond. In biological systems mixed chelate complexes involving amino acid and peptides have provided approximate models for activation process such as occur in metalloenzymes or metal activated enzymes (e.g. Carboxy peptidase A, Carbonic Anhydrase, Oxaloacetate Decarboxylase etc.) The mixed chelate complexes suggests an important rote for such species in the storage and transport of either metal ions or of donor molecules. Hence these complexes appears very important within organisms in which they are metabolized.

自然界特别是在生物体系中广泛地存在着混合型络合物。它的形成可以是一步同时生成或逐步生成,也可以是由单一型络合物混合生成。混合络合物的稳定性是由如下因素所决定的,即:统计效应,静电效应,共价键性,立体效应和配体的合作效应。在生物体内,混合络合物的形成涉及到:生物分子的稳定化和三维构象的稳定化,金属离子和配体分子的分布和运转,某些金属酶的催化作用(如脱羧酶、水解酶,羰基水化酶,碳酸酐酶等)及生物固氮等等问题。

The adsorption from binary mixtures of aliphatic diacid C_2-Cand hydrochlorc acids has been studied systematically, by using sugar charcoal as an adsorbent.The experimental resnlts are given below. (1)The order of adsorption of pure aliphatic diacids is opal is acid>malonic acid>succinic acid>glutaric acid>adipic acid. It is just the reverse of Traubc rule. (2)The adsorption of malonic acid, succinic acid, glutaric acid or adipic acid in HCl solntions is less than when it is present alone. These facts agree...

The adsorption from binary mixtures of aliphatic diacid C_2-Cand hydrochlorc acids has been studied systematically, by using sugar charcoal as an adsorbent.The experimental resnlts are given below. (1)The order of adsorption of pure aliphatic diacids is opal is acid>malonic acid>succinic acid>glutaric acid>adipic acid. It is just the reverse of Traubc rule. (2)The adsorption of malonic acid, succinic acid, glutaric acid or adipic acid in HCl solntions is less than when it is present alone. These facts agree with Ting and Fu's assumption that the decrease of adsorption of individual acids is due to the displacement of the solvent, with subsequent shift of equilibrium, and not due to simple displaccment . (3)The adsorption of oxalis acid in HCl solutions is increased. The higher the concentration of HCl is, the more pronounced will be the increase of adsorption of oxalic acid. There may be three factors cntributing to the increase of adsorption of oxalic acid:(a) the decrease of dissociation; (b) electrostatic effect; (c) the lowering of solubility. To determine the relative importance of these factors requires further investigation.

本文是一项实验研究。我们选择脂肪族直链二元酸(C_2-C_6,乙二酸-己二酸),使其一个个地和盐酸配合成为混合酸溶液,在30℃用自制的糖炭考察了它在上述溶液中的吸附作用。发现:盐酸的存在使乙二酸的吸附量较其单独时增加,而丙二酸、丁二酸、戊二酸、己二酸的吸附量则因盐酸的加入而比单独时降低了。这种多样性有助于我们深入了解混合酸液中的吸附机理。

 
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