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precursor     
相关语句
  前体
    APPLICATION OF DIAZOMETHANE IN DRUGS SYNTHESIS AND ITS PRECURSOR REAGENTS
    重氮甲烷及其前体试剂在药物合成中的应用
短句来源
    Production of Vitamin C Precursor——2-Keto-L-Gulonic Acid from L-Sorbose by a Novel Bacterial Component System of SCB329-SCB933 I. The Biological Characteristics of a Novel Bacterial Component System of SCB329-SCB933
    新组合菌系SCB329-SCB933利用L-山梨糖发酵产生维生素C前体——2-酮基-L-古龙酸的研究 Ⅰ.新组合菌系SCB329-SCB933的生物学特性
短句来源
    Production of Vitamin C Precursor——2-Keto-L-Gulonic Acid from L-Sorbose by A Novel Bacterial Component System of SCB329-SCB933 II. High Sorbose Fermentation by Installment-Batch Method
    新组合菌系SCB329-SCB933利用L-山梨糖发酵生产维生素C前体——2-酮基-L-古龙酸的研究 Ⅱ.利用L-山梨糖批加技术实现高糖发酵
短句来源
    Study on phase composition in the precursor of a Cu based methanol synthesis catalyst
    合成甲醇铜系催化剂前体物相的研究
短句来源
    METHODS 3,4,5-trimethoxy-triphenyl benzylidene bromide phosphine salt,the important precursor of the phosphine Ylide,was synthesis from deoxidize,bromization and addition.
    方法以3,4,5-三甲氧基苯甲醛为原料,经过还原、溴代、加成三步反应得到叶立德前体3,4,5-三甲氧基苄溴三苯基膦盐。
短句来源
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  前驱体
    ADSORPTION AND MODIFICATION OF MACROMOLECULAR PEG ON THE ZrO_2 PRECURSOR
    PEG在ZrO_2前驱体表面的吸附及改性作用
短句来源
    Study on the Thermal Decomposition Mechanism and Reaction Kinetics of the Precursor of Ultrafine BaTiO_3 with High Purity
    高纯超细BaTiO_3前驱体的热解机理及动力学
短句来源
    In order to select suitable catalyst from four metals(Fe、Co、Ni、Mo)to synthesize carbon nanofibers/carbon nanotubes on carbon fibers,by the impregnation-reduction method and chemical vapor deposition method were used four metal—salts separately as catalyst precursor,CO as carbon source,H_2 as reduction gas,N_2 as carrier gas.
    为了选择合适的催化剂,来催化炭纤维生长纳米炭纤维/纳米碳管,分别以Fe、Co、Ni和Mo的金属盐为催化剂前驱体,H_2为还原气体,N_2为载气,采用浸渍—还原法在炭纤维表面制备纳米催化剂颗粒,再以CO为碳源,催化热解生长纳米炭纤维/纳米碳管。
短句来源
    The vinyl silazane (VL20) is a kind of liquid ceramic precursor.
    乙烯基硅氮烷(VL20)是一种液态陶瓷前驱体,在光引发剂存在下与巯基化合物快速发生光聚合反应。
短句来源
    with the increase of molar ratio of Li to Ti in the precursor,the content of Li-Ti-O solid fusion increases and mainly presents the cubic form of Li1.33Ti1.66O4;
    随着浸渍过程Li与Ti摩尔比的增加,前驱体中Li-Ti-O固熔体的量逐渐增加,主要物质为立方晶系的Li1.33Ti1.66O4;
短句来源
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  先驱体
    Preparation of Polycarbosilane Precursor for SiC Fiber with Low Specific Resistance from PDMS/PVC
    PDMS/PVC制备低电阻率碳化硅纤维先驱体聚碳硅烷
短句来源
    Study on Preparation of Phenolic Foam Precursor for Carbon Foam
    碳泡沫先驱体酚醛泡沫制备工艺研究
短句来源
    Preparation and Characterization of Polycarbosilane Precursor for SiC Fiber with Low Specific Resistance
    低电阻率SiC纤维先驱体聚碳硅烷的制备与表征
短句来源
    SYNTHESIS AND CHARACTERIZATION OF PRECURSOR POLYALUMINOCARBOSILANE TO SiC(Al) CERAMIC FIBERS
    SiC(Al)陶瓷纤维先驱体聚铝碳硅烷的合成与表征
短句来源
    SYNTHESIS OF PRECURSOR FOR BN FIBERS
    BN纤维先驱体的合成
短句来源
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  前驱物
    Study on Preparation of Pd/C Catalyst with Palladium(Ⅱ)Acetylacetonate as Precursor
    用乙酰丙酮钯作前驱物制备Pd/C催化剂的研究
短句来源
    The structural characteristics of γ Al 2O 3 and its pseudoboehmite precursor were discussed.
    本文阐述了负载型催化剂常用载体γ Al2 O3其前驱物拟薄水铝石的孔结构特征。
短句来源
    The effects of active metal M(Pt,Pd,Rh and Ru),support(ZSM-5,β-zeolite,MCM-41 and SiO_2)and Pd precursor on the performance of chiral M-CS-support catalyst were also studied.
    研究了活性金属(Pd、P t、Rh和Ru)、载体(ZSM-5、β、M CM-41、S iO2),及钯的前驱物对多相手性加氢催化剂性能的影响。
短句来源
    Zinc oxide, cerium oxide, alpha-iron oxide, zinc oxide/nickel oxide and chromium oxide/alumina nanofibers were fabricated by sol-gel process and electrospinning technique, using polyvinyl alcohol (PVA Mn=80000) and various of inorganic salts as precursor. This method offered a brand-new way for fabricating one-dimensional inorganic nanomaterial.
    本文通过溶胶-凝胶过程,采用静电纺丝技术技术,以聚乙烯醇(PVA Mn=80000)和各种无机盐为前驱物,制备了 ZnO、CeO_2、α-Fe_2O_3等单组分纳米纤维和 NiO/ZnO 和 Cr_2O_3/Al_2O_3等复合组分纳米纤维,为一维无机纳米材料的制备提供了一条崭新的途径。
短句来源
    Zirconium oxide, tungsten oxide/zirconium oxide and molybdenum oxide/zirconiumoxide nanofibers were fabricated by sol-gel process and electrospinning technique, usingpolyvinyl alcohol (PVA Mn=80000) and various of inorganic salts as precursor. This methodoffered a brand-new way for fabricating one-dimensional inorganic nanomaterial.
    本文通过溶胶-凝胶过程,采用静电纺丝技术,以聚乙烯醇(PVA,Mn=80000)和各种无机盐为前驱物,制备了ZrO_2单组分纳米纤维和WO_3/ZrO_2和MoO3/ZrO_2复合组分纳米纤维,为一维无机纳米材料的制备提供了一条崭新的途径。
短句来源
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      precursor
    The overall process involves three steps: preparation of insoluble carboxyl-containing grafted starch copolymer (ISC), formation of precursor (ISC-Co), decomposition of ISC-Co, and phase transition of Co3O4 nanoparticles.
          
    The precursor was proved to be [Zn5(OH)6(CO3)2] by TG-DTG-DTA and IR analysis.
          
    This precursor was calcined at 300°C for 1, 2 and 3 hours respectively, and then the nanocrystalline ZnO of different grain size were obtained.
          
    Steam produced during the decomposition process accelerated the sintering of MgO, and MgO with surface area as high as 412 m2 · g-1 was obtained through calcining its precursor in flowing dry nitrogen at 520°C for 4 h.
          
    ZrWMoO8 powders with different morphologies were obtained using ammonium tungstate, molybdate tungstate and zirconium tungstate as the starting materials by dehydrating the precursor ZrWMoO7(OH)2(H2O)2.
          
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    By using high and low resolution mass spectrometric determination as well as metastable technique, it has been found that in pyrrolizidine alkaloids(mostly macrocyclic dilactones)there exists a definite pathway of fragmentation, which leads to the formation of a specific ion series with the conjugated m/e 117 as the precursor ion. The relation between the abundance of these ions and the structure of the molecules has been investigated. This specific ion series can be used as a criterion of the presence...

    By using high and low resolution mass spectrometric determination as well as metastable technique, it has been found that in pyrrolizidine alkaloids(mostly macrocyclic dilactones)there exists a definite pathway of fragmentation, which leads to the formation of a specific ion series with the conjugated m/e 117 as the precursor ion. The relation between the abundance of these ions and the structure of the molecules has been investigated. This specific ion series can be used as a criterion of the presence of the pyrrolizidine alkaloids.

    本文通过高、低分辨质谱和亚稳跃迁实验解析了在C—7、C—9位有取代原子(团)的双吡咯烷类化合物(主要是大环双内酯系列)所存在的质谱特性,并论证了这种特征与其结构—N核上的双键数与C—7、C—9位的取代原子(团)——之间的关系,提出:此特征可以作为判别这类化合物是否可能存在的依据.

    This paper dealt with the application of a low toxicity, water soluble precursor, ph-enyl acetyl ethanol amine (PEAE), in ben- zyl penicillin fermentation process.A series of experiments had been done to get the best ratio between the amount ofPEAE and the fermentation medium. In a batch fermentation process, it can be added up to0.4~0.6%. No significant difference in ioxicities, specific productivities and conversion yields observed by using the pure or the crude compounds.

    应用苯乙酰基乙醇胺为苄青霉素发酵前体,与目前广泛采用的苯乙酸等比较,在发酵过程中,以菌体增殖、效价增长率等指标衡量,其显著特点是毒性低,其次是易溶于水,经一系列试验结果麦明:在单批发酵中,一次最高加入量可达0.4~0.6%左右。粗制品和精制品的使用效果无明显差异。

    This article deals with the recent technical development of PAN-based carbon fibres. The properties of carbon fibres such as Young modulus, tensile strength and uniformity can be improved through the proper choice of comonomers of precursor fibre, careful control of spinning process and adequate regulation of heating rates, heat treatment time and strength in carbonization and grafitization. Brief description is also made for ways of improving the qualitative stability and oxidization resistance of carbon...

    This article deals with the recent technical development of PAN-based carbon fibres. The properties of carbon fibres such as Young modulus, tensile strength and uniformity can be improved through the proper choice of comonomers of precursor fibre, careful control of spinning process and adequate regulation of heating rates, heat treatment time and strength in carbonization and grafitization. Brief description is also made for ways of improving the qualitative stability and oxidization resistance of carbon fibres and their present status. It is pointed that change of density in the process of heat treatment can be utilized as an effective means to characterize and control the degree of the reaction.

    综述了近年来丙烯腈基碳纤维的技术开发动态。通过适宜地选择原丝的共聚单体、精细地控制纺丝过程、合理地调节碳化和石墨化的升温速率及热处理时间和张力,可改善碳纤维的杨氏模量、抗张强度和均一性。简单介绍了碳纤维质量稳定性和耐氧化性的改善途径和现状。指出,热处理过程中密度的变化,可作为表征和控制热处理反应程度的有效方法。

     
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