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hydrogen     
相关语句
  
    Study on Coal Pyrolysis by Hydrogen Plasma to Produce Acetylene
    等离子体裂解煤制取乙炔的研究
短句来源
    The Technical Research on the Preparation of Vacuum Carbureted Medium──the Mixture of Methane and Hydrogen by Cracking of Liquidized Hydrocarbon
    液化烃热裂解法制取真空渗碳介质──甲烷、混合气的工艺研究
短句来源
    Research on Bromination of 4-Nitroaniline With Hydrobromic Acid and Hydrogen peroxide as Brominating Agent in Medium of Dilute Sulfuric Acid
    4-硝基苯胺在稀硫酸介质中用溴酸和过氧化为溴化剂溴化反应的研究
短句来源
    STUDY OF STRUCTURE OF POLYDIMETHYLSILOXANES AND DETERMINATION OF HYDROGEN AND HYDROXYL BONDED TO SILICONE BY FOURIER TRANSFORM ~1H NMR
    聚二甲基硅氧烷结构的~1H NMR研究和硅、硅羟基含量的测定
短句来源
    REDUCTION OF 2-[β-(2-THIENYL) VINYL] BENZOIC ACID WITH CATALYTIC HYDROGEN TRANSFER
    催化转移法还原2-[β-(2-噻吩基)乙烯基]苯甲酸
短句来源
更多       
  氢气
    THE STUDY OF ONE-STEP SYNTHESIS OF MIBK WITH ACETONE AND HYDROGEN CATALYZED BY RESIN-PD
    用离子交换树脂-Pd催化丙酮和氢气一步法合成甲基异丁基酮的研究
短句来源
    Effects of Hydrogen Self produced in the Aromatization of Propane on ZnHZSM 5
    ZnHZSM-5上丙烷芳构化反应自身氢气气氛的影响
短句来源
    MANUFACTURE AND IMPROVEMENT OF OUTLET CHECK VALVE FOR HYDROGEN COMPRESSOR
    氢气压缩机出口单向阀的制造及改进
短句来源
    The catalytic co-pyrolysis of the mixture of corncob and polyethylene(2∶8 in weight ratio),using HZSM-5,H-Beta,NaY and TiO2 as the catalysts,was performed in a self-made fixed bed reactor in an atmosphere of hydrogen at 490℃ for 4 hours.
    本文研究了在氢气氛围及HZSM-5、H-Beta、NaY和TiO2催化剂作用下玉米芯与LDPE混合物(重量比2∶8)的共热解情况。
短句来源
    The factors influencing on the synthetic process were investigated and the optimum conditions were obtained, i.e. the mass ratio of 2,3,4-trifluoronitrobenzene to self-made Raney-Ni catalyst was 70.8∶1.0, reaction temperature of nitration was 65~70℃, the pressure of hydrogen was 0.1~0.2 MPa.
    并对其合成工艺中的影响因素进行研究,获得最佳工艺条件为:反应温度65~70℃,氢气压力0.1~0.2MPa,m(2,3,4-三氟硝基苯)∶m(自制催化剂)=70.8∶1.0。
短句来源
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  制氢
    Thermochemical Generation of Hydrogen from Water
    热化学法分解水制氢
短句来源
    FRESH WATER IMMERSION FOR DISCHARGING THE LOW TEMPERATURE SHIFT CONVERSION CATALYST IN HYDROGEN PRODUCTION PROCESS
    用新鲜水浸泡法卸制氢装置低温变换催化剂
短句来源
    Optimization of hydrogen manufacture process using JT 1G hydrogenation catalyst
    采用JT-1G型加氢催化剂优化制氢工艺
短句来源
    PERFORMANCE ANALYSIS AND MAINTENACE DISCUSSION OF FURNACE TUBE FOR HYDROGEN MANUFACTURING CONVERSION FURNACE
    制氢转化炉炉管的性能分析与维护措施探讨
短句来源
    Repair of Conversion Furnace Tubes in Hydrogen Plants
    制氢转化炉炉管的修复
短句来源
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  氢能
    Based on the analysis, the paper indicates that in the first 30 years of 21 st century, DME is exactly the fuel that China needs, as if has mature technology, good economy and emission between using oil and hydrogen.
    阐述了在 2 1世纪前 30年内二甲醚是一种技术成熟、经济性好、污染排放介于石油和氢能之间的中国所需的能源。
短句来源

 

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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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    The current methods for the preparation of ethyl orthosilicate do not give satisfactory results.It is found that the low yield is due to the use of excess alcohol,which,in presence of hydrogen chloride,produces water and causes the ethyl orthosilicate to undergo a hydrolytic polycondensation.The condensation products have been isolated and identified as 1,3-hexaethoxydisiloxane and 1,3,5- octaethoxytrisiloxane. An improved method,consisting of the addition of equivalent quantities of silicon tetrachloride...

    The current methods for the preparation of ethyl orthosilicate do not give satisfactory results.It is found that the low yield is due to the use of excess alcohol,which,in presence of hydrogen chloride,produces water and causes the ethyl orthosilicate to undergo a hydrolytic polycondensation.The condensation products have been isolated and identified as 1,3-hexaethoxydisiloxane and 1,3,5- octaethoxytrisiloxane. An improved method,consisting of the addition of equivalent quantities of silicon tetrachloride and anhydrous ethyl alcohol into ice-cold ethyl orthosilicate as diluent,is recommended.The reaction mixture gives 95% of theoretical yield of the ethyl orthosilicate.

    现行文献中所载原矽酸乙酯的制备法,其产率均不能使人满意。我们找出产率不高的主要原因是过量的醇和作用所发生的氯化氢生成了水,水引起了原矽酸乙酯的水解缩聚作用。这已经由实验证明。作用副产物亦经纯化鉴定,主要的是1,3-六乙氧基二矽氧烷和1,3,5-八乙氧基三矽氧烷。改进的制备法是将等作用量的四氯化矽和无水乙醇(克分子数比为1:4)同时滴入冷却的、受搅拌的原矽酸乙酯(作为稀释剂)中,经搅拌半小时,即徐徐加热以除去氯化氢,然后蒸馏。这样,原矽酸乙酯的产率达95%。这个方法并适用于连续操作。

    Desdimethylaminoaureomycin (Ⅳ) and desdimethylaminodesoxyaureomycin (Ⅴ), when subjected to catalytic hydrogenation, yield deschlorodesdimethylaminoaureomycin (Ⅶ) and deschlorodesdimethylaminodesoxyaureomycin (Ⅷ) respectively. On warming with methanolic hydrogen chloride, Ⅶ and Ⅷ give their corresponding anhydro-compounds: deschlorodesdimethylaminoanhydroaureomycin (Ⅹ) and deschlorodesdimethylaminodesoxy- anhydroaureomycin (Ⅺ). On catalytic hydrogenation, anhydroaureomycin (Ⅵ) is converted into deschloroanhydro-...

    Desdimethylaminoaureomycin (Ⅳ) and desdimethylaminodesoxyaureomycin (Ⅴ), when subjected to catalytic hydrogenation, yield deschlorodesdimethylaminoaureomycin (Ⅶ) and deschlorodesdimethylaminodesoxyaureomycin (Ⅷ) respectively. On warming with methanolic hydrogen chloride, Ⅶ and Ⅷ give their corresponding anhydro-compounds: deschlorodesdimethylaminoanhydroaureomycin (Ⅹ) and deschlorodesdimethylaminodesoxy- anhydroaureomycin (Ⅺ). On catalytic hydrogenation, anhydroaureomycin (Ⅵ) is converted into deschloroanhydro- aureomycin (Ⅳ), which, on further hydrogenation with zinc-acetic acid, produces a mixture of Ⅹ and Ⅺ. A comparison of the ultra-violet absorption spectra of Ⅶ, Ⅷ, Ⅸ, Ⅹ with the cor- responding degradation products of terramycin, Ⅻ, (XIII), (XIV), (XV), provides further evidence for the similarity of the structures between aureomycin and terramycin.

    脫二甲胺金黴素(IV),脫二甲胺脫羥金黴素(V)分别予以接觸氫化,產生脫氯脫二甲胺金黴素(VII)及脫氯脫二甲胺脫羥金黴素(VIII)。這兩種產物再分別以甲醇鹽酸處理,得到它們相當的脫水化合物:脫氯脫二甲胺脫水金黴素(X)及脫氯脫二甲胺脫羥脫水金黴素(XI)。脫水金黴素(VI)經接觸氫化。產生脫氯脫水金黴素(IX)。後者用鋅粉醋酸氫解,亦得到Ⅹ與Ⅺ。

    This paper deals with the synthesis of 3-[o-dichloro (or monochloro-) acetamino-p-nitro-plenyl]-propanol (Ⅱ or Ⅱa),structurally varying from chloramphenicol on the one hand by shif-ting the dichloroacetamino group from the aliphatic side-chain to aromatic ring and replacing thesecondary hydroxyl group by hydrogen on the other,for the purpose of investigating the relationbetween biological action and chemical constitution of the antibiotic.The resulting compoundsshowed no inhibiting effect against E.coli,S.thphosa,S.paratyphi...

    This paper deals with the synthesis of 3-[o-dichloro (or monochloro-) acetamino-p-nitro-plenyl]-propanol (Ⅱ or Ⅱa),structurally varying from chloramphenicol on the one hand by shif-ting the dichloroacetamino group from the aliphatic side-chain to aromatic ring and replacing thesecondary hydroxyl group by hydrogen on the other,for the purpose of investigating the relationbetween biological action and chemical constitution of the antibiotic.The resulting compoundsshowed no inhibiting effect against E.coli,S.thphosa,S.paratyphi A and B.staphylococcusaureus,and B.subtilis.The compounds Ⅱ and Ⅱa were prepared by a 4-step synthesis starting from o-nitrocin-namyl alcohol (Ⅵ),which upon hydrogenation in the presence of Raney-nickel catalyst led tothe formation of 3-(o-aminophenyl)-propanol (Ⅶ),m.p.65°.By nitrating the latter with amixture of HNO_3 and H_2SO_4,there was formed 3-(o-amino-p-nitrophenyl)-propyl hydrogen sul-phate (Ⅷ),m.p.203°(decomp.); which on subsequent hydrolysis with dilute mineral acidgave the desired product 3-(o-amino-p-nitrophenyl)-propanol (Ⅸ),m.p.90°.In order toestablish the orientation of the nitro group,this compound was converted into its N,O-diacetylderivative (Ⅹ),m.p.128°,which on oxidation with potassium permanganate gave the knowno-acetamino-p-nitrobenzoic acid (Ⅺ).Finally,the compounds Ⅱ,m.p.132°,and Ⅱa,m.p.118°,were obtained by chloroacetylation with an appropriate acid chloride.Direct hydrogenation of o-nitrocinnamaldehyde (Ⅻ) in the presence of Raney-nickel catalystgave rise to 1,2,3,4-tetrahydroquinoline (ⅩⅢ).

    本文报告合成氯霉素相似化合物3-[隣二氯(或一氯)乙醯氨基-对硝基苯基]-丙醇。此等化合物对大肠杆菌,伤寒杆菌,副伤寒甲及乙杆菌,金色葡萄球菌及枯草杆菌等细菌均不现抑制作用。说明氯霉素分子上的二氯乙醯氨基从脂肪炼上移至芳香环的相邻位置上,以及仲醇羟基以氢代替后则原有的抗生作用即消失。

     
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