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  tri
    The Synthesis and Crystal Structure of Tri(α-Dithionaphthoato) Chromium, Cr(α-C10H7CS2)3·1/2 CH2C12
    (α-萘荒酸)合铬(Ⅲ)Cr(α-C_(10)H_7CS_2)_3.1/2CH_2Cl_2的合成与晶体结构
短句来源
    SYNTHETIC AND CHARACTERISTIC STUDIES ON COMPIEX OF Cu(l) AND TRI [β((BEMZOTHIOZOLE-2) THIO) ETHYL] AMINE
    [β((苯并噻唑-2)巯)乙基]胺与铜(Ⅰ)的配合物的合成和性质
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    Synthesis and Properties of Tri(1-methylimidazole)cobalt(Ⅱ) Sulfate and Hexaimidazolecobalt(Ⅱ) Sulfate
    硫酸(1-甲基)咪唑合钴(II)、硫酸六咪唑合钴(II)的合成和性质研究
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    SEPARATION AND DETERMINATION OF GOLD WITH TRI (2-ETHYLHEXYL) PHOSPHATE BY PAPER AND COLUMN EXTRACTION CHROMATOGRAPHY
    用(2-乙基己基)磷酸酯萃取纸色层及柱色层分离、测定金的研究
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    STUDIES ON BORON COMPOUNDS——ⅩⅩ.SYNTHESIS AND CONVERSION OF ETHANOLAMINE TRI(2-FURYL)BORANE
    硼化合物的研究——XX.乙醇胺合(2-呋喃基)硼烷的合成及其转化
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  tris
    Synthesis and Characterization of Transition Metal Complexes with Tris(2-Pyridylmethyl)Amine Derivatives
    (2-吡啶甲基)胺衍生物过渡金属配合物的合成及结构表征
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    THE PREPARATION OF 2, 4, 6--TRIS(2', 4'--DIHYDROXYPHENYL)--1, 3, 5--TRIAZINE BY SOLID PHASE REACTION
    固相法合成2,4,6,-(2’,4’-二羟基苯基)-1,3,5-
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    GAS-CHROMATOGRAPHIC STUDIES ON THE COMPLEXATION INTERACTION OF RARE EARTH COMPLEXES Ⅰ. THE INTERACTION OF TRIS (1, 1, 1, 2, 2, 3, 3-HEPTAFLUORO-7, 7-DIMETHYL-4, 6-OCTANEDIONATO)-EUROPIUM (Ⅲ) WITH ETHERS
    气相色谱法研究稀土金属络合物的络合作用——Ⅰ.-[1,1,1,2,2,3,3-七氟-7,7-二甲基-辛二酮-(4,6)]铕(Ⅲ)与醚类的相互作用
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    CRYSTAL AND MOLECULAR STRUCTURE OF SYNERGISTIC COMPLEX OF TRIS (1-PHENYL -3-METHYL-4-TRIFLUOROACETYL-PYRAZOLONE 5)BIS(TRIPHENYLPHOSPHINE OXIDE) NEOD YMIUM (III)
    (1-苯基-3-甲基-4-氟乙酰基-吡唑啉酮-5)二(苯基氧化膦)合钕(Ⅲ)协萃配合物晶体和分子结构
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    Stereoselectivity in Tris(phenanthroline) Chromium (Ⅲ) Binding to DNA
    菲咯啉合铬键合DNA的立体选择性
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  “三”译为未确定词的双语例句
    Study on the Phase Behavior of Binary Polymer Blends and Ternary Mixtures Containing Fillers by Dynamic Rheological Technique
    二元聚合物及含填料的元共混体系相行为的动态流变学研究
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    Microwave-assisted Ring-opening Polymerization of 2, 2-Dimethyltrimethylene Carbonate and ε-Caprolactone
    2,2-二甲基亚甲基碳酸酯和ε-己内酯的微波开环聚合
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    Studies on Low Temperature Solid-state Syntheses, Crystal Structures and Third-order Non-Linear Optical (NLO) Properties of the Homo-(hetero-)nuclear Metal Clusters
    金属同(异)核簇合物的低温固相合成、结构及阶非线性光学性能的研究
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    Multicomponent Biginelli Reaction and Pd-catalyzed Aldol Condensation Reaction in the Presence of TMSCI
    甲基氯 硅烷参与的多组分Biginelli反应及钯催化的Aldol缩合反应
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    Synthesis and Properties of Reactive Ternary Fluorescence Complexes of Terbium and Europium as Well as Their Polymer Fluorescence Complexes
    反应型铽、铕元荧光配合物及其高分子荧光配合物的合成与性能研究
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  tri
The sequences, including the SNPs, were amplified via polymerase chain reaction (PCR) and labeled using digoxigenin deoxyuridine tri-phosphate (Dig-dUTP).
      
Some high-cost and toxic materials such as tri-n-octylphosphine oxide (TOPO) are used in the popular method to synthesize CdSe NCs.
      
Especially, the triblock copolymer can form a multi-layer, tri-dimensional fibrous network and a petaline structure from the mono-layer fibrous network with the increase of its concentration in ethanol.
      
Whether rapid ATP hydrolysis requires the binding of ATP to a second site (bi-site activation) or to a second and third site (tri-site activation) is considered.
      
The transition from ethyleneimine monomer to di-, tri-, and tetramer leads to a sharp increase in the rate constant of infectivity inactivation, whereas the rate constant of protein modification changes insignificantly.
      
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  tris
Hyperbranched poly(aryl ether ketone)s were prepared by polymerization of hydroquinone (A2) and 1,3,5-tris[4-(4-fluorobenzoyl)phenoxy]benzene (B3).
      
A convenient method for the synthesis of tris(2,2'-bipyridyl) dichlororuthenium(II) hexahydrate-doped amino-modified double-layer silica nanoparticles is presented in this paper.
      
Changes in the Antigenic Properties of Azospirillum brasilense Lipopolysaccharide, Induced by Addition of Tris-(hydroxymethyl)-a
      
Addition of tris-(hydroxymethyl)-aminomethane (Tris) into the culture medium of Azospirillum brasilense sp245 changes the antigenic properties of the lipopolysaccharide (LPS) isolated from the external membrane of the bacteria.
      
LPS preparations from the bacteria grown in the presence of Tris have been analyzed by immunodiffusion, using monospecific antibodies.
      
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1. A simple method is presented for determining double bond index of pure unsaturated hydrocarbons, petroleum fractions and other hydrocarbon mixtures based on a correlation of observed refractive index, calculated refrac-tive index, molecular weight and the number of double bonds per molecule. The data neccessary are: (a) mid-boiling point, (b) refractive index at 20℃ for sodium D line, (c) density at 20℃ and (d) weight percent hydrogen of the

依据在20℃钠D线折光率实测值,在20℃钠D线折光率计算值,分子量及每一分子内所含双键数间之相互关系,推衍得一简易方法,用以测定纯不饱和烃及石油分馏油份之双键率(Double Bond Index).所需由实验测得之数据为试料之(甲)在20℃钠D线折光率,(乙)在20℃时之密度,(丙)中间沸点(Mid-boiling point),及(丁)含氢重量百分数.用本法测得双键率值,与用尼蒲金(Lipkin),圣金(Sankin)及马丁(Martin)氏法测得双键率值适相吻合.因此,用本法所测得之双键率,足资用以鉴定石油分馏油份内所含芳香族烃及烯(?)烃之主要型式.惟需指明者,即在依据本法测得之双键率,用以鉴定石油分馏油份内所含不饱和烃之主要型式时,必须测定由石油分馏油份内提出仅含不饱和烃浓缩物之双键率.

Von Knorre first suggested the use of benzidine and o-tolidine for the determination of tungsten. With the latter reagent, he succeeded also in separat- ing tungstate from phosphate. Later on, o-dianisidine and vanillylidene benzidine have been proposed as precipitants for tungstate. The optimum pH ranges for the quantitative precipitation of tungstate by means of these precipitants and tetraminodiphenyl, which have not yet been found in the literature, are: benzidine pH: 2.0-5.5 o-tolidine 2.9-4.7 o-dianisidine...

Von Knorre first suggested the use of benzidine and o-tolidine for the determination of tungsten. With the latter reagent, he succeeded also in separat- ing tungstate from phosphate. Later on, o-dianisidine and vanillylidene benzidine have been proposed as precipitants for tungstate. The optimum pH ranges for the quantitative precipitation of tungstate by means of these precipitants and tetraminodiphenyl, which have not yet been found in the literature, are: benzidine pH: 2.0-5.5 o-tolidine 2.9-4.7 o-dianisidine 2.0-4.1 vanillylidene benzidine 1.7-3.9 tetraminodiphenyl 1.7-4.8 The effect of introducing various groups into the benzidine molecule upon the tungsten precipitating property is not profound. The relation between quantitative precipitation of tungstate with benzidine and the product of concentrations of both constituents before precipitation Was studied. It is found that quantitative precipitation of tungstate ions Can be realized only when the product of concentrations of reactants before precipitation is equal to or greater than 0.8 × 10~(-5), and the moles of benzidine added must be at least equal to that of tungstate. The gravimetlic determination of tungsten by means of o-tolidine may be applied to samples containing as low as 10 mg of rungsten trioxide in 200 ml solution, if an absolute error of 0. 5 mg can be tolelxted. For larger quantities of tungsten present in sample, the absolute errors amount to only 0.1-0.2 mg. Tetraminodiphenyl may be used as a tungsten precipitant, but no advantage over benzidine Wan found in our present studies.

1.用二胺聯苯及其數種衍生物沉澱鎢酸根時,其適宜的pH範圍如下:[4,4′]二胺聯苯 pH:2.0-5.5[3,3′]二甲基[4,4′]二胺聯苯 2.9-4.7[3,3′]二甲氧基[4,4′]二胺聯苯 2.0-4.1[4]對胺聯苯氮甲烯[2]甲苯酚 1.7-3.9[3,4,3′,4′]四胺聯苯 1.7-4.8 2.用[4,4′]二胺聯苯作沉澱劑時,二胺聯苯和鎢酸根在沉澱前的濃度之乘積與後者沉澱完全與否的關係,曾加研究。 3.用[3,3′]二甲基[4,4′]二胺聯苯作沉澱劑時,能测定低至10毫克的氧化鎢。

In view of the necessity of a rapid and accurate process for the deter-mination of fluorine applicable in the analysis of sodium fluoride and otherfluorine compounds,the author has established a new volumetric processconsisting in the titration in aqueous-alcoholic medium with ferric nitrate asstandard solution and sodium salicylate as indicator.All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the reaction:6NaF+FeCl_3→Na_3FeF_6+3NaCl....

In view of the necessity of a rapid and accurate process for the deter-mination of fluorine applicable in the analysis of sodium fluoride and otherfluorine compounds,the author has established a new volumetric processconsisting in the titration in aqueous-alcoholic medium with ferric nitrate asstandard solution and sodium salicylate as indicator.All of the methods,published by Guyot,Greeff,Fairchild andVisintin proposed for the determination of fluorine using ferric solutionas standard,are based on the reaction:6NaF+FeCl_3→Na_3FeF_6+3NaCl. But the sodium ferric fluoride thus formed is fairly soluble in water and makesthe end-point unclear,therefore the titration can not be performed accurately.This seems to be due to the fact that the following two reactions advancesimultaneously,and accordingly the formation of sodium ferric fluoride is in-complete in aque(?)us medium:3NaF+Fe(NO_3)_3→FeF_3+3N_aNO_33NaF+FeF_3→Na_3FeF_6Nevertheless,these reactions,according to the author's experiments;proceedalmost quantitatively in meda.containing at least 50% by volume of alcohol.This paper reports the xperimental results obtained in the fundamentalstudies on the various factors influencing the accuracy of the volumetry,namely,the sensitivity and the necessary amount of sodium salicylate used asindicator,the pH value,the alcoholic concentration of the titration medium,the concentration of the fluoride taken for the determination and the timewhen alcohol should be added in the course of titration.Furthermore,a rapidvolumetric process with high accuracy is proposed together with its applicationsin ordinary analyses of sodium fluoride and other fluorine compounds.The proposed method is characteristic in using sodium salicylate asindicator,which shows sharp violet color with minute amount of ferric ion inmedium of pH 3 controlled with buffer solution,then titrating with standardferric nitrate,and adding proper amount of alcohol(the alcoholic concentra-tion at the end-point should be above 50%)during the titration,when themedium becomes orange yellow in color.The method may be summarized as follows:Take 5 ml of neutral sodiumfluoride solution of about 0.3 N in a small Erlenmeyer flask,add 2.5 mlof Walpole's buffer solution of pH 3(formed by dissolving 34.0 g ofcrystalline sodium acetate and 20 ml of 38% HCl in water,and making upto 250 ml)and 1 ml of 0.1 M sodium salicylate dissolved in 50% alcohol.After sufficient stirring,titrate with standard 0.3 N(0.05 M)ferric nitratesolution,using micro-burette until the medium becomes orange yellow,thisstep being reached after addition of about 4 ml of titrant.Then decolorizethe solution by adding 12.5 ml of absolute alcohol(or 13 ml of 95% alcohol),previously purified by redistillation with lime;stirring is necessary during theaddition.Further continue the titration until the light pink color formeddoes not fade after stirring for 30 seconds when observed over a white surface. In the analyses of sodium fluoride and other fluorine compounds con-taining interfering substances,such as divalent and polyvalent metallic ions,phosphate,silicate,borate,carbonate,sulfide ions and reductants acting on ferricion,it is necessary to separate fluorine from these interfering substances bythe distillation with sulfuric acid according to the method of Willard andWinter(20).Then the distillate is neutralized with dilute sodium hydroxideand adjusted to the proper pH with hydrochloric acid using p-nitrophenol asindicator.The solution is ready for titration as described.But in the caseof absence of these interfering substances except carbonate,for example,inthe determination of the concentration of sodium fluorde solution obtained bythe extraction of the crude product,produced industrially by fusing fluorsparwith sodium carbonate and silica,the above separation of fluorine by dis-tillation is dispensable.The anaIytical results obtained by the proposed method are in goodagreement with those obtained by the lead chlorofluoride process(8),whichis recognized as official method for the determination of fluorine in agriculturalproducts.

本文介绍一容量分析氟的新方法和在工业制品上的应用,并分析了一种工业制备的氟化钠液,所得的结果和氟氯化铅法所得的极为一致。对于影响该分析法准确度的各种因素:指示剂的灵敏度和滴定时适宜的用量、溶液的 pH 值、应加的乙醇量、操作中加乙醇的次序、以及氟离子的适宜浓度,均加以研究并找出适宜的情况。本法用硝酸铁为标准液,水杨酸钠作指示剂,在 pH=3左右作滴定;当溶液呈橙黄色时,加入适量的乙醇,使其浓度在终点时仍不低于50%。如有干扰物质如二价及多价金属离子、磷酸根、矽酸根、硼酸根、碳酸根、硫化物和还原物质可能与价铁起作用者,均应分离之。

 
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