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hydrogen peroxide
相关语句
  过氧化氢
    A NEW METHOD FOR THE ELECTROLYTIC HYDROGEN PEROXIDE PRODUCTION
    生产过氧化氢的电解新方法
短句来源
    Study of Reaction Mechanism of CoTSPC as Catalyst used for Electrocatalysis Reduction of Oxygen and Hydrogen Peroxide
    四磺基酞菁钴作为氧和过氧化氢电催化还原催化剂的作用机理研究
短句来源
    Study on digestion method of liquid sample with perchloric acid and hydrogen peroxide
    高氯酸-过氧化氢法消化液体样品的研究
短句来源
    A study of treatment of wastewater containing refractory organics with hydrogen peroxide in presence of ferrous ion and UV radiation
    紫外光及亚铁离子催化下过氧化氢处理废水中难分解有机物的研究
短句来源
    USE OF COBALT( Ⅱ)-LUMINOL-H2O 2 CHEMILU- MINESCENT SYSTEM FOR THE DETERMINATION OF HYDROGEN PEROXIDE
    利用Co(Ⅱ)-鲁米诺-H_2O_2化学发光体系测定过氧化氢
短句来源
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  双氧水
    CYCLOHEXANE OXIDATION CATALYZED BY TITANIUM SILICALITE (TS-1) WITH HYDROGEN PEROXIDE
    TS-1分子筛催化双氧水氧化环己烷(英文)
短句来源
    Rapid Determination of Cation Surfactant Tetrabutylammonium Halide Using Its Parallel Catalytic Hydrogen Wave in the Presence of Hydrogen Peroxide
    双氧水存在下平行催化氢波法快速测定四丁基卤化铵
短句来源
    SYNTHESIS OF FERRITE CATALYST UNDER MAGNETIC FIELD AND ITS INFLUENCE ON HYDROGEN PEROXIDE DECOMPOSITION
    铁氧体催化剂磁性合成及其对双氧水分解反应的影响
短句来源
    Liquid Phase Selective Oxidation of Toluene and Ethylbenzene over V-based Catalysts in the Presence of Hydrogen Peroxide
    钒基催化剂在双氧水存在下对甲、乙苯液相选择氧化的研究
短句来源
    Study of Hydrogen Peroxide Oxidation Cyclohexanone to Adipic Acid Catalyzed by Heteropoly Acids under Microwave Irradiation
    微波促进杂多酸催化双氧水氧化环已酮制备己二酸
短句来源
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  “hydrogen peroxide”译为未确定词的双语例句
    PYRIMIDINE RESEARCH: THE ACTION OF HYDROGEN PEROXIDE ON MERCAPTO-PYRIMIDINES. FORMATION OF 2-HYDROXY-4-CHLORO-PYRIMIDINE, 2-HYDROXY-4-ALKOXY-PYRIMIDINE,URACIL AND CYTOSINE
    嘧啶的研究:過氧化氫對硫醇基嘧啶的作用2-羟基-4-氯代嘧啶,2-羟基-4-烷氧基嘧啶,2,4-二羟基嘧啶和2-羟基-4-氨基嘧啶的合成
短句来源
    THE ACTION OF HYDROGEN PEROXIDE TOWARDS 2-METHYL-3- (β-DIETHYLAMINOETHYL) INDOLE
    過氧化氫對2-甲基-3-(β-二乙胺乙基)吲哚的作用
短句来源
    Spectrophotometric Determination of Titanium(IV) in Iron and Steel with 3,5-dibromo-PADAP and Hydrogen Peroxide
    钛(Ⅳ)-3,5-二溴-PADAP-H_2O_2体系光度法测定钢铁中钛
短句来源
    Studies on Catalytic Activities of Anticancer Drugs Platinun Series Complexes and Their Derivates——Ⅱ. Catalytic activity applying to decomposition of hydrogen peroxide
    抗癌药物铂系配合物及其衍生物的合成应用与催化活性的研究——Ⅱ.用于H_2O_2分解的催化活性
短句来源
    Spectrophotometric Determination of Vanadium with 2-(2 Thienylazo) -5-Diethylaminophenol and Hydrogen Peroxide
    应用V-H_2O_2-TADAP三元配合物光度法测定钒
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  hydrogen peroxide
Their catalytic activity in the oxidation of cyclohexanol and benzyl alcohol was investigated with only aqueous 30% hydrogen peroxide.
      
Electrochemical behavior of hydrogen peroxide sensor based on new methylene blue as mediator
      
A novel amperometric hydrogen peroxide sensor was proposed by co-immobilizing new methylene blue (NMB) and Horseradish peroxidase (HRP) on glassy carbon electrode through covalent binding.
      
The experiments showed NMB could effectively transfer electrons between hydrogen peroxide and glassy carbon electrode.
      
The oxidant was a 30 wt-% aqueous solution of hydrogen peroxide.
      
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When ceric iodate is precipitated from acid solution by the addition of asoluble iodate,a gelatinous precipitate is obtained,which is difficult to filterand wash.The precipitate must be redissolved and reprecipitated as oxalatefor final ignition to ceric oxide.A method has been deviced to improve the form of the ceric iodateprecipitate by slow precipitation in homogeneous solution.Advantage is takenof the fact that cerium exists in two distinct valence states,the cerous and theceric.Cerous iodate is soluble...

When ceric iodate is precipitated from acid solution by the addition of asoluble iodate,a gelatinous precipitate is obtained,which is difficult to filterand wash.The precipitate must be redissolved and reprecipitated as oxalatefor final ignition to ceric oxide.A method has been deviced to improve the form of the ceric iodateprecipitate by slow precipitation in homogeneous solution.Advantage is takenof the fact that cerium exists in two distinct valence states,the cerous and theceric.Cerous iodate is soluble in dilute acid solution,while ceric iodate isinsoluble.Cerium is first reduced to the cerous state by hydrogen peroxide innitric acid solution.Ammonium iodate is added and no precipitation occurs atthis moment.The precipitation is brought about by the slow formation ofceric ion in the iodate solution by ammonium persulfate.Thus a denseprecipitate is formed slowly.This compact volume of the precipitate facilitatesfiltration and washing.The precipitate is ignited directly to ceric oxide,part of which is always stained with a brown color.This is remedied by evapora-tion of the ignited precipitate to dryness with a few drops of concentratedsulfuric acid and ignition to ceric oxide for final weighing.For samples containing 10-50 mg of ceric oxide,a total volume of 300-400 ml gives best results.The optimum concentration of the nitric acid presentis 0.4-0.5 N.A starting temperature of 40-60℃ favors the denseness of theprecipitate.Precipitation is continued at an elevated temperature(70-80℃ )on a hot plate.Stirring not only improves the crystallinity of the precipitateand may decrease the occlusion of impurities,but also shortens the time forcomplete precipitation.Dilute iodic acid solution(1-2%)is used as washsolution.This method is good for samples containing 2.5-250 mg of cericoxide.The composition of the precipitate is not reproducible.The precipitate is abasic iodate and the ratio of IO_3~-found/IO_3~- theoretical for Ce(IO_3)_4 increaseswith the concentration of the nitric acid present(up to 0.5 N)to a maximumvalue of about 0.92.The ratio never reaches unity.An analysis of the pre-cipitate dried at 40-45℃ for 2-3 days shows a fairly constant ratio of IO_3~- found/IO_3 theoretical for Ce(IO_3)_4 From the ratio of Ce:IO_3,an approximate formulaCe_2(IO_3)_7(OH)·XH_2O has been proposed for the precipitate obtained under theconditions described.The number of water molecules in the formula is in-definite,varying from 3 to 5.

1.在均匀溶液中沉淀的碘酸铈,性质紧密,便利于过滤和洗涤。烧灼成为氧化铈后,适合于作为铈的定量分析。2.利用碘酸亚铈能溶解于稀酸溶液而碘酸铈则不溶的区别,先用过氧化氢把全部铈离子还原,再加入碘酸铵,然后进行氧化,使碘酸铈在均匀溶液中沉淀出来。3.本方法适用于含氧化铈2.5—250毫克的样品。4.所得沉淀的分子式经初步测定为 C_(e2)(IO_3)_7(OH)·x H_2O,其中 x 的数值不定,涨落在3与5之间。

In this paper a new method has been proposed for computing the potential functions of internal rotations.Applying this method,we have calculated the potential functions of several important molecules,such as 1,2-dichloroethane, 1,1,2-trichloroethane,1,1,2,2-tetrachloroethane,n-butane,2-methyl butane,2,3- dimethyl butane,etc.All the calculated results agree with the experimental data. According to our theory,the potential functions of the three types of molecules CX_2Y-CX_2Y,CXY_2-CXY_2 and CX_2Y-CXY_2 are intimately...

In this paper a new method has been proposed for computing the potential functions of internal rotations.Applying this method,we have calculated the potential functions of several important molecules,such as 1,2-dichloroethane, 1,1,2-trichloroethane,1,1,2,2-tetrachloroethane,n-butane,2-methyl butane,2,3- dimethyl butane,etc.All the calculated results agree with the experimental data. According to our theory,the potential functions of the three types of molecules CX_2Y-CX_2Y,CXY_2-CXY_2 and CX_2Y-CXY_2 are intimately related,if the poten- tial function of the first molecule is written as V_1(φ)=A_1+Bcosφ+Ccos2φ+D_1cos3φ. Then those of the second and the third will be of the following forms: V_2(φ)=A_2+Bcosφ+Ccos2φ+D_2cos3φ V_3(φ)=A_3-Bcosφ-Ccos2φ+D_3cos3φ where D_i~'s(i=1,2,3)can be calculated from the potential barriers of CX_3-CX_3, CY_3-CY_3,CX_3-CY_3 or similar kinds of molecules,while the A_i~'s are not important for actual problems. In this paper we have also discussed the structures of hydrazine,ethyl alco- hol,hydrogen peroxide,and the meso and active forms of the CXYZ-CXYZ type of molecules.Besides,we have pointed out that the potential functions of both the meso and the active forms of the CXYZ-CXYZ type can be calculated from those of the CX_2Y-CX_2Y,CY_2Z-CY_2Z and CZ_2X-CZ_2X types.

本文对分子内旋转问题作了以下的贡献:首先在理论上,提供了一种分子内旋转势函数的新的计算方法。这种新方法不仅理论上来得谨严,避免了以往旧方法中的一些缺点,而且比较简单,应用范围也因此比较广泛。其次,应用这种方法到一些具体问题,得到了下列结果:1.严格的得到了 Pitzer 方程,并估计了它的准确程度。2.证明了 CX_2Y-CX_2Y、CY_2X-CY_2X 和 CX_2Y-CXY_2内旋转势函数间的连系性,设第一种分子的势函数为V_1(φ)=A_1+B cosφ+C cos 2φ+D_1 cos 3φ第二和第三两种分子的势函数分别为V_2(φ)=A_2+B cosφ+C cos 2φ+D_2 cos 3φ和V_3(φ)=A_3-B cosφ-C cos 2φ+D_3 cos 3φ具体讨论了两类很重要的相关的分子:一类是 CH_2Cl—CH_2Cl、CHCl_2—CHCl_2和CHCl_2—CH_2Cl,另一类是 CH_2(CH_3)—CH_2(CH_3)、CH(CH_3)_2—CH(CH_3)_2和CH_2(CH_3)—CH(CH_3)_2。理论上得到的结果和实验全都符合。3.批判了以往一些人建议的乙醇的内旋...

本文对分子内旋转问题作了以下的贡献:首先在理论上,提供了一种分子内旋转势函数的新的计算方法。这种新方法不仅理论上来得谨严,避免了以往旧方法中的一些缺点,而且比较简单,应用范围也因此比较广泛。其次,应用这种方法到一些具体问题,得到了下列结果:1.严格的得到了 Pitzer 方程,并估计了它的准确程度。2.证明了 CX_2Y-CX_2Y、CY_2X-CY_2X 和 CX_2Y-CXY_2内旋转势函数间的连系性,设第一种分子的势函数为V_1(φ)=A_1+B cosφ+C cos 2φ+D_1 cos 3φ第二和第三两种分子的势函数分别为V_2(φ)=A_2+B cosφ+C cos 2φ+D_2 cos 3φ和V_3(φ)=A_3-B cosφ-C cos 2φ+D_3 cos 3φ具体讨论了两类很重要的相关的分子:一类是 CH_2Cl—CH_2Cl、CHCl_2—CHCl_2和CHCl_2—CH_2Cl,另一类是 CH_2(CH_3)—CH_2(CH_3)、CH(CH_3)_2—CH(CH_3)_2和CH_2(CH_3)—CH(CH_3)_2。理论上得到的结果和实验全都符合。3.批判了以往一些人建议的乙醇的内旋转势函数经验式,从理论上提出了乙醇势函数的正确形式,并推断了乙醇的内旋转异构体。4.由内旋转势函数推得过氧化氢的结构,并推得联氨的可能结构,和实验结果相符合。并提供了一种实验方法,来判断联氨分子中的——因此也就是氨分子中的氮原子上独对电子的性格,是 s 还是 sp~3,或者接近于哪一种。 5.讨论了 CXYZ-CXYZ 内旋消式和活性式的内旋转问题,证明了它们的内旋转势函数,和 CX_2Y-CX_2Y、CY_2Z-CY_2Z 以及 CZ_2X-CZ_2X 的密切相关联。知道了后三者的势函数,前者的也就立刻可以计算。同时推测了 CXYZ-CXYZ内旋消式有两种内旋转异构体,活性式有三种,都以对位结构为最稳定。根据我们所讨论的,可以很清楚地看出:Pitzer 和 Crawford 等人所造的计算表已经不够用了。为了使得分子内旋转问题很好的向前发展,需要造一种以V_(φ)=A+B cosφ+C cos 2φ+D cos 3φ为内旋转势函数的计算表。

There was described a condition for the action of hydrogen peroxide on some mercapto-pyrimidines. 2-Ethylmercapto-pyrimidines [Ⅰ, X=Cl, OCH_3, OC_2H_5, NH_2, NHCH_3 or N(C_2H_5)_2] reacted with hydrogen peroxide in ethanol to form 2-hydroxy-pyrimidines [Ⅱ, X=Cl, OCH_3, OC_2H_5, NH_2, NHCH_3 or N(C_2H_5)_2]. The reaction is represented as follows: In case that X in formula Ⅰ was C_2H_5S, it was possible to prepare uracil (Ⅱ, X=OH).By means of the above mentioned new reaction, the following pyrimidine...

There was described a condition for the action of hydrogen peroxide on some mercapto-pyrimidines. 2-Ethylmercapto-pyrimidines [Ⅰ, X=Cl, OCH_3, OC_2H_5, NH_2, NHCH_3 or N(C_2H_5)_2] reacted with hydrogen peroxide in ethanol to form 2-hydroxy-pyrimidines [Ⅱ, X=Cl, OCH_3, OC_2H_5, NH_2, NHCH_3 or N(C_2H_5)_2]. The reaction is represented as follows: In case that X in formula Ⅰ was C_2H_5S, it was possible to prepare uracil (Ⅱ, X=OH).By means of the above mentioned new reaction, the following pyrimidine derivatives were prepared:2-Hydroxy-4-X-pyrimidine (Compound Ⅱ)Nature of X Empirical Formula m.p.CI C_4H_3ON_2Cl 152-154°OCH_3 C_5H_6O_2N_2 132-134°OC_2H_5 C_6H_8O_2N_2 168-170°OH C_4H_4O_2N_2 320°(with becomposition)NH_2 C_4H_5ON_3 290-292°(with decomposition; needles transformed to cubes at 190°)X=NHCH_3 C_5H_7ON_3 268°X=N(C_2H_5)_2 C_8H_(13)ON_3 280-281°The mechanism of the action of hydrogen peroxide on 2-ethylmercapto-4-chloro-pyrimidine was considered as follows: 2-Ethylmercapto-4-chloro-pyrimidine reacted with hydrogen peroxide to form 2-ethylsulphonyl-4-chloro-pyrimidine, which was then further oxidized by hydrogen peroxide to yield 2-hydroxy-4-chloro-pyrimidine and ethyl sulphonic acid. For supporting this interpretation, the authors attempted to oxidize with hydrogen peroxide 2-ethylsulphonyl-4-chloropyrimidine, which was prepared by Sprague and Johnson's method.2-Ethylmercapto-6-alkoxy-pyrimidine (Ⅰ, X=OCH_3 or OC_2H_5) reacted with hydrogen peroxide in ethanol to form 2-hydroxy-4-alkoxy-pyrimidine (Ⅱ, X=OCH_3 or OC_2H_5) in a lower yield and uracil in a higher yield. This phenomenon was interpreted as follows: 2-ethylmercapto-6-alkoxy-pyrimidine (Ⅰ, X= OCH_3 or OC_2H_5) reacted with hydrogen peroxide to form 2-hydroxy-4-alkoxy-pyrimidine (Ⅱ, X=OCH_3 or OC_2H_5) and ethyl sulphonic acid, the latter acting as a catalyst, which would accelerate the conversion of 2-hydroxy-4-alkoxy-pyrimidine (Ⅱ,X=OCH_3 or OC_2H_5) into uracil (Ⅱ, X=OH). The change is represented as follows:2-Hydroxy-4-chloro-pyrimidine was reduced to 2-hydroxy-pyrimidine, m.p. 178-180° or m.p. 180-182°, by (a) the action of zinc dust in ethanol in presence of ammonium hydroxide and (b) by the catalytic reduction in presence of palladium-charcoal in ethanol.

1.2-乙硫醇基嘧啶[Ⅲ,X=Cl,OCH_3,OC_2H_5,NH_2,NHCH_3或N(C_2H_5)_2]与過氧化氫在乙醇溶液中作用,形成2-羥基嘧啶[Ⅳ,X=Cl,OCH_3,OC_2H_5,NH_2, NHCH_3或N(C_2H_5)_2]。 2.以過氧化氫氧化2-乙硫醇基+氯代嘧啶形成2-羥基-4-氯代嘧啶的反應歷程,作者建議如下:首先過氧化氫氧化2-乙硫醇基-4-氯代嘧啶為2-乙磺醯基-4-氯代嘧啶,再以過氧化氫進一步氧化得到2-羥基-4-氯代嘧啶。 3.2-乙硫醇基-4-烷氧基嘧啶与過氧化氫作用,形成產量較低的2-羥基-4-烷氧基嘧啶,和產量較高的2,4-羥基嘧啶。 4.2-羥基-4-氯代嘧啶(1)在乙醇溶液中,有氫氧化銨存在下和鋅粉作用及(2)在乙醇溶液中,以鈀-碳為催化劑,進行催速氫化,均還原為2-羥基嘧啶。

 
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