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hydrogen     
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     A Study on Hydrogen Transfer Reaction over Catalytic Materials Used in FCC Process
     FCC催化材料上的转移反应研究
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     Effect of Alloying, Heat Treatment and Magnetization Treatment on Microstructure and Electrochemical Properties of AB_5 Type Hydrogen Storage Electrode Alloy
     合金化、热处理及磁化处理对AB_5型贮电极合金微结构与电化学性能的影响
短句来源
     A Study on the Improvement of Cycling Stability of Ball-milled Mg-based Hydrogen Storage Electrode Alloys by Means of Multi-component Alloying
     以多元合金化改进球磨Mg基贮电极合金循环稳定性的研究
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     The Nanosecond and Femtosecond Laser Photoionization and Initio Calculation Stndies of Some Hydrogen Bond Clusters
     若干键团簇的纳秒和飞秒激光光电离及从头计算研究
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     Study on Electrochemical Behavior of AB_5-type Hydrogen Storage Alloys for Ni-MH Battery
     MH-Ni电池用AB_5型贮合金电化学行为的研究
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  氢气
     Studies on Novel Four-Bed Pressure Swing Adsorption Process for Hydrogen Purification
     新型四塔变压吸附提纯氢气过程研究
短句来源
     Studies on the Catalytic Conversion of Alkanes to Hydrogen/Syngas
     烷烃催化转化制氢气/合成气的研究
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     A Mossbauer study on thermal decomposition of supported K_3[Fe(CN)_6] in hydrogen
     穆斯堡尔谱研究负载型K_3[Fe(CN)_6]在氢气中的热分解
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     STUDIES ON THERMAL DECOMPOSITION OF DODECAMOLYBDOPHOSPHORIC ACID AND ITS SALTS WITH HYDROGEN
     十二钼磷酸及其盐在氢气中热分解过程的研究
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     Study of Isochronal Annealing Behavior of Neutron Irradiated Hydrogen FZ Silicon by Positron Annihilation
     中子辐照氢气区熔硅单晶退火行为的正电子湮没研究
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  氢的
     Catalytic Oxidation and Reforming of Methanol to Produce Hydrogen
     甲醇催化氧化重整反应制氢的研究
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     Physiologial and Biochemical Control of Photobiological Hydrogen Production from Microalgae and Microalgal Biotechnology
     微藻光合放氢的生理生化调控及生物技术研究
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     Hydrogen Generation from Ammonia Decomposition and Separation by Palladium Membrane
     氨分解制氢与钯膜分离氢的研究
短句来源
     STUDIES ON IRON CATALYSTS OF AMMONIA SYNTHESIS PROMOTED BY ALKALI METAL--Ⅳ.STATE AND ROLE OF HYDROGEN IN THE IRON CATALYST
     碱金属助催的合成氨铁催化剂的研究--Ⅳ.合成氨铁催化剂中氢的状态和作用
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     STUDIES ON ANALYSIS OF ORGANO-METALLIC COMPOUNDS-Ⅰ -MICRODETERMINATION IN ORGANO-METALLIC COMPOUNDS OF CARBON AND HYDROGEN
     有机金属化合物分析研究(Ⅰ)——有机金属化合物中碳与氢的微量测定
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  制氢
     Study on Process of Biological Hydrogen Production from Indirect Photo-hydrolysis by Unicellular Green Algae
     绿藻间接光解水制氢过程的研究
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     Study on the CO_2 Sorbents in the Single-Step Hydrogen Production from Carbonaceous Energy
     含碳能源直接制氢中CO_2吸收剂的研究
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     A Novel Process of Catalytic Gasification of Biomass for Hydrogen Production with Solid Heat Carrier
     固体热载体法生物质催化气化制氢新工艺研究
短句来源
     Study on the System of Photosynthetic Hydrogen Production by Solar Energy and Its Spectrum Co-Operate Character
     太阳能光合生物制氢系统及其光谱耦合特性研究
短句来源
     Hydrogen Generation from Ammonia Decomposition and Separation by Palladium Membrane
     氨分解制氢与钯膜分离氢的研究
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  hydrogen
In the CoMSIA model, steric, electrostatic, hydrophobic and hydrogen bond donating factors were correlated to the activity and later the favorable and unfavorable regions of interaction were obtained.
      
tripos standard, hydrogen bonding, parabolic indicator in the case of CoMFA and steric, electrostatic, donor, acceptor, hydrophobic, donor and acceptor, steric and electrostatic in the case of CoMSIA.
      
Flavonoid antioxidants act as scavengers of free radicals by rapid donation of a hydrogen atom.
      
In addition, electrostatic, hydrogen-bonding, and dipole-dipole interactions are responsible for the above separations, which improve the selectivity of DNB for solutes.
      
Both metalation reaction with n-butyllithium and hydrochlorination reaction with dry hydrogen chloride selectively and quantitatively occurred at the pendant reactive sites, generating polymeric benzyllithium and 1-chloroethylbenzene species.
      
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A variatioual calculation of the energy of the-2s2 is state of helium has been carried out with the use of a wave function of the Hylleraasian typo. The wave function is where s,t u are in units of 4 times the first Bohr radius of hydrogen. The energy iscompared with the value -1.4400 Rh obtained by the method of self-consistent field.

本文以变分法计算2s~21~S态氦原子之能量,所用之波函式,即:=e~(-0.2278s){1-0.17079s-0.063155u-0.013869t~2 +0.010044u~2+0.0064785s~2}上式中之s,t,u均以4倍於氢原子之第一Bohr半径为单位。由此所计算得之能量为 E(2s~21~S)=-1.5412Rh而由自足场方法所算得之值则为-1.4400Rh。

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)三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.

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。

 
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