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general preparation methods
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  常用制备方法
     The applications of metal membranes and metal composite membraiiee to hydrogena- tion and dehydrogenation reaction are introduced. The general preparation methods and theprospects of metal composite membranes are also discussed.
     文介绍了金属膜和金属复合膜在加氢和脱氢反应中的应用及金属复合膜的常用制备方法和发展趋势。
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  “general preparation methods”译为未确定词的双语例句
     The general preparation methods and the application of Ni-YSZ cermet are reviewed.
     总结了目前国内外制备Ni-YSZ金属陶瓷常用的方法并介绍其应用前景。
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     In this paper,general preparation methods are discussed.
     本文介绍了纳米SiO2 的一般制备方法 ,对各种制法的优缺点进行了评述 ;
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     In this paper, general preparation methods were discussed.
     介绍了纳米SiO2的一般制备方法,对各种制法的优缺点进行了评述;
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     In general,L.
     L.
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     general;
     (2)总论;
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     The general situation of carbon nanotubes' preparation
     碳纳米管的制备方法概况
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     General Setting Preparation of Conference Interpreting
     论译员会议前的口译准备工作
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     In this paper, general preparation methods were discussed.
     介绍了纳米SiO2的一般制备方法,对各种制法的优缺点进行了评述;
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The applications of metal membranes and metal composite membraiiee to hydrogena- tion and dehydrogenation reaction are introduced.The general preparation methods and theprospects of metal composite membranes are also discussed.Comparing with metal membranes,themetal composite membranes have the advantages of high hydrogen permeation flux and low cost.

文介绍了金属膜和金属复合膜在加氢和脱氢反应中的应用及金属复合膜的常用制备方法和发展趋势。与非复合的金属膜相比,金属复合膜具有氢透量高、金属用量少和成本低等优点。

Preparation methods of D - amino acid including general method, chemical asymmetric transformation and biological asymmetric transformation were reported. Preparation of DL - amino acid followed with division of general preparation method of D - amino acid, included physical division, chemical division and biological division. Preparation process of D - amino acid by heating L - or DL - amino acid, chirality s reagent and catalyst followed by reaction with base are known...

Preparation methods of D - amino acid including general method, chemical asymmetric transformation and biological asymmetric transformation were reported. Preparation of DL - amino acid followed with division of general preparation method of D - amino acid, included physical division, chemical division and biological division. Preparation process of D - amino acid by heating L - or DL - amino acid, chirality s reagent and catalyst followed by reaction with base are known as chemical asymmetric transformation. By this method, D - proline, D - phenyl glycine, D - 4 - hydroxyl phenyl glycine and other D - amino acid were prepared. Biological asymmetric transformation included asymmetric degrade of DL -amino acid derivative and asymmetric conversion of DL - intermediate to D - amino acid catalyzed with microbial enzymes.

简述了制备D-型氨基酸的方法、化学不对称转换、生物不对称转换方法。制备D-型氨基酸的一般方法是先制备外消旋体,再进行拆分。根据拆分的手段和途径不同,分为物理拆分、化学拆分、生物拆分等。化学不对称转化是以L-型氨基酸或DL-型氨基酸为原料在拆分剂和催化剂共同存在下加热得到D-型氨基酸与拆分剂形成的盐,后者与碱反应得到D-型氨基酸。生物不对称转换包括两种情况,(1)不对称降解,即首先把DL-氨基酸衍生化。然后利用微生物产生的酶使氨基酸衍生物不对称水解,(2)先制备某一外消旋中间体,然后通过微生物体产生的消旋酶和水解酶在一定条件下使外消旋中间体转变为D-型氨基酸。

The general preparation methods and the application of Ni-YSZ cermet are reviewed.The homogeneous nanocomposite30Ni-YSZ(mol%)cermet powders are prepared by liquid-phase method.The identification of phases is carried out using a X-ray diffractometer(XRD).The particle size and morphology are deter-mined by a scanning electron microscopy(SEM).The results show that the nanocomposite cermet powders with homogeneous size and distribution are prepared.The crystal type of ZrO 2 in the powders is tetragonal.The...

The general preparation methods and the application of Ni-YSZ cermet are reviewed.The homogeneous nanocomposite30Ni-YSZ(mol%)cermet powders are prepared by liquid-phase method.The identification of phases is carried out using a X-ray diffractometer(XRD).The particle size and morphology are deter-mined by a scanning electron microscopy(SEM).The results show that the nanocomposite cermet powders with homogeneous size and distribution are prepared.The crystal type of ZrO 2 in the powders is tetragonal.The average crystal size of ZrO 2 in ZrO 2 -NiO and ZrO 2 -Ni powders are19.2nm and24.7nm respectively.

总结了目前国内外制备Ni-YSZ金属陶瓷常用的方法并介绍其应用前景。采用液相法制备出Ni金属在YSZ陶瓷中分布均匀的复合材料,用XRD分析了其物相组成并用SEM观察了其颗粒形貌。研究结果表明,用该法可以制备出分布均匀的金属陶瓷纳米复合粉末,粉末中的ZrO2均为四方相。ZrO2-NiO和ZrO2-Ni粉末中ZrO2的平均晶粒大小分别为19.2nm和24.7nm。

 
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