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precursor
相关语句
  前驱体
    The ultrafine nickel powders are prepared by polyol reduction process with NaOH, Ni(NO3)2·6H2O,ethylene glycol(EG) and polyvinylpyrrolidone(PVP) as raw materials,and the effects of precursor on particle size and morphology of nickel powders are investigated.
    采用Ni(NO3)2.6H2O、NaOH、乙二醇(EG)和聚乙烯吡咯烷酮(PVP)为原料,用多元醇法制备超细镍粉,研究前驱体对产物粒径和形貌的影响。
短句来源
    Interesting finding is that H content in the film grown by with NH3 as precursor is lower than that with N2 as precursor.
    实验发现, 使用NH3作为前驱体所制备的膜中较N2具有更低的H含量;
    Preparation of Ultra-fine CeO_2 Precursor for Optical Glass Polishing Material
    光学玻璃抛光材料用超细CeO_2前驱体的制备
短句来源
    Preparation of Bi-Based Superconductor Precursor Powder by a Spray-Dry+Fluidized Bed Denitration Technology
    喷雾干燥-流化床脱硝法制备Bi系超导前驱体粉末
短句来源
    Influence of precursor solution on preparation of (W,Ni,Fe) composite powder
    前驱体溶液对(W,Ni,Fe)复合氧化物粉末制备的影响
短句来源
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  先驱体
    SYNTHESIS FOR PRECURSOR OF NANO SI(C,N) COMPOSITE POWDER AND ITS GASIFICATION BEHAVOR
    Si-C-N微粉的硅氨烷先驱体的合成及气化行为
短句来源
    (2) A new kind of Organically modified oxygen-sensitive membrane based on fluorescence quenching was prepared by sol-gel method, using DDS and TEOS as the mixed precursor, RufchenbCla as the indicator.
    (2)以四乙氧基硅烷和二甲基二乙氧基硅烷为共聚先驱体,Ru(phen)_3Cl_2为荧光指示剂,通过改变DDS/TEOS比值,制备了有机改性溶胶凝胶氧敏感膜。
短句来源
    Using TTIP as the precursor, titanium films had been deposited by DBD-CVD method on slide substrates, which had good photocatalysis and hydropilicity. Base on this, titanium films were deposited on Low-E glass preliminarily, and the multiplicity of the functions of Low-Emission and self-cleaning was realized at some extent.
    以TTIP(四异丙醇钛)为先驱体,采用介质阻挡放电化学气相沉积法(DBD-CVD),在普通玻片上制备得到具有一定光催化性和亲水性的TiO_2单层薄膜,并且以此为基础,初步在Low-E玻璃(SnO_2:F薄膜)上镀TiO_2薄膜,在一定程度上实现了低辐射和自清洁功能的复合。
短句来源
    篫ro2(3Y) precursor which uniformly mixed with Y2O3 was prepared via hydrous-zirconia,which was prepared by microwave heating, coated with Y(OH)3 by heterogeneous nucleation processing. After ZrO2(3Y) precursor was calcined, its phase structure was analyzed by XRD. It wasfound that m-ZrO2 didn't exist in ZrO2(3Y) powder at room temperature.
    用微波法制备单分散、纳米水合二氧化锆,利用异相成核工艺在水合二氧化锆粒子表面均匀包覆一层Y(OH)3,制备出包覆型ZrO2(3Y)粉体先驱体.最后对煅烧ZrO2(3Y)粉体进行相结构分析,发现在室温下包覆型ZrO2(3Y)粉体中无m-ZrO2存在.结果表明;
短句来源
    An organosilazane precursor which can be product nanometer Si(C,N) compositepowders by aerosol method was studied. The reaction of CH3SiHCl2 with gaseous NH3 in diethylether solution results in the formation of silazane precursor.
    研究了用气相裂解法制备Si-C—N复合纳米微粉时CH3SiHCl2氨解产物先驱体的合成及形成气溶胶时的行为,结果表明:合成温度对先驱体的摩尔质量有较大的影响,摩尔质量随红解温度的降低而增大;
短句来源
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  前驱物
    Using InCl_3·4H_2O as raw materials, the precursor of ultrafine In_2O_3 powder was prepared by hydrolysis,
    本文以InCl_3·4H_2O为原料,经水解、胶溶、凝胶制备超细粉的前驱物,350℃煅烧得到In_2O_3超细粉末。 利用XRD、TEM、TG-DTA等测试手段对粉末的物相、形貌进行了较详尽的研究。
    Fabrication technique by the way of precursor crystal sublimation and photocatalysis for TiO_2 film
    前驱物结晶体升华成膜法制备TiO_2薄膜及其光催化性研究
短句来源
    A homogenous mixture precursor of Al2O3 + C was prepared by the chemical precipitation method and AlN powders were fabricated by carbon thermal reduction nitridation of the precipitated precursor.
    采用化学沉淀法制备出混合均匀的Al_2O_3+C前驱物,以此前驱物为原料制备AlN粉末,与直接以氧化铝和碳黑为原料的工艺相比较,氮化反应温度降低约100℃,反应速率也大大提高。
短句来源
    AlO(OH) fiber with the ratio of length with diameter 13:1 were prepared at 350℃ by using 1mol/LAl(NO3)3 as precursor, 1 mol/L KBr as additive; complex oxides made up of ZrO2 and AlO(OH) were prepared at 240℃ by using 0.75mol/L AlC13 and 0.25mol/L ZrOCl2 mixed solutions as precursor.
    1mol/LKBr为添加剂,在350℃可制得长径比为13:1的AlO(OH)纤维.当采用AlCl3、ZrOCl2溶液为前驱物,Zr/Al的比例为1:3时,在240℃可制得纤维状AlO(OH)颗粒和球形ZrO2颗粒的复合氧化物粉体.
短句来源
    A new precursor containing a homogenous mixture of noncrystalline Al2O3 and carbon was prepared with aluminium nitrate, glucose and urea as raw materials, by a low-temperature combustion process.
    采用硝酸盐-有机物低温燃烧反应溶胶-凝胶工艺,以硝酸铝(Al(NO3)3·9H2O)、葡萄糖(C6H12O6·H2O)、尿素(CO(NH2)2)为原料,制备出粒度细小、混合均匀的铝源和碳源的混合前驱物,然后以该前驱物为原料进行碳热还原反应制备氮化铝粉末.
短句来源
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  “precursor”译为未确定词的双语例句
    THE POSSIBILITY OF A KIND OF EARTHQUAKE PRECURSOR MONITORING USING SATELLITE CH_4 CHANNELS
    用卫星CH_4通道监测地震前兆的可能性
短句来源
    Thermodynamic Analysis of Coprecipitation Route to Synthesize Bi-Based Superconductor Precursor Powder
    共沉淀法制备Bi系超导体原始粉末的热力学分析
短句来源
    Amorphous precursor transformed directely into pure YAG phase at 800℃.
    在800℃,粉体直接由无定形相转变为YAG单相.
    By using aluminum sulfate as a precursor, and sulfate salt mixture (Na2SO4:K2SO4=2.4:1.6) as molten salt, the fine flaky alumina particles, with thickness of 200-400 nm and mean aspect ratio of 50 were synthesized in the presence of some additives.
    本文采用熔盐法制备了片状氧化铝粉体,考察了熔盐种类和熔盐用量对粉体形貌的影响. 以硫酸铝为铝源,复合硫酸盐(Na2SO4+K2SO4)为熔盐,辅以外加添加剂,合成出了厚度为200-400 nm,平均径厚比约为50的形貌较好的片状氧化铝.
    The results showed that the shape and the particle sizes of the products are mainly controlled by the composition of mineralizer and seeds as the particle sizes of alumina precursor are less than 1 μm.
    结果表明,当原料粒度小于1 μm时,产物的粒度大小和形貌主要取决于矿化剂和晶种的组成。
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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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Specific features of electro-magnetic disturbance with saw-tooth envelope near earth surface prior to the occurrence of an earthquake and its corretion with the magnitude of the earthquake are investigated on the basis of abundant data obtained from the Tangshan disaster of 1976. To give the physical mechanism of bringing about such a precursor, a preliminary hypothesis with a mode of stress concentration-microfracture in rocks-acoustic emission-variation in electrical conductivity-electro-magnetic disturbance...

Specific features of electro-magnetic disturbance with saw-tooth envelope near earth surface prior to the occurrence of an earthquake and its corretion with the magnitude of the earthquake are investigated on the basis of abundant data obtained from the Tangshan disaster of 1976. To give the physical mechanism of bringing about such a precursor, a preliminary hypothesis with a mode of stress concentration-microfracture in rocks-acoustic emission-variation in electrical conductivity-electro-magnetic disturbance with saw-tooth envelope is proposed.

本文以唐山地震后较丰富的观测考察资料为依据,探讨了临地震前地球表面层锯齿形包络电磁场扰动信息的特点及其与地震的对应关系.初步提出了产生这种临震前兆信息的物理机制的假设,即应力集中—岩石微破裂—声发射—导电率σ变化—锯齿形包络电磁场扰动的模式.

Based on the data of the ground temperature of meteorological station at 20:00 (Beijing time) November 5 and 6 1988 before the Lancang M7.6 earthquake at 21:00 November 6 the satellite thermal infrared digital image and satellite picture almost at the same time, this paper analyzed the relations between thermal infrared images and tectonics, lithology, landform as well as heat raliation characteristic of normal background of meteorological phenomena etc.; expounded the differences and relations of temperature-increased...

Based on the data of the ground temperature of meteorological station at 20:00 (Beijing time) November 5 and 6 1988 before the Lancang M7.6 earthquake at 21:00 November 6 the satellite thermal infrared digital image and satellite picture almost at the same time, this paper analyzed the relations between thermal infrared images and tectonics, lithology, landform as well as heat raliation characteristic of normal background of meteorological phenomena etc.; expounded the differences and relations of temperature-increased anomaly of seismic precursors with normal state; summed up the method and experience for seizing impending precursors using the time-space dynamic variation of thermal infrared images.

本文基于1988年11月6日21时澜沧7.6级地震前的气象台站地面观测温度与相近时刻卫星热红外资料,分析了热红外图像与构造、岩性、地貌及气象等的关系,阐述了震兆增温异常与正常情况下的区别,初步总结了利用热红外图像的时、空动态变化特征捕捉地震临震前兆的方法和体会。

The studies on the thermal deposition of transition metal coordination compounds have been directly motivated by the development of organometallic chemical vapor deposition (OMCVD) technique. Among these compounds Cu(II) acetylacetonate, Cu(acac)_2, is a potentially important precursor for the deposition of Cu film and preparation of high T_e superconducting films. However, little information about the kinetics of thermal decomposition of this compound is available. In this paper we report a kinetic study...

The studies on the thermal deposition of transition metal coordination compounds have been directly motivated by the development of organometallic chemical vapor deposition (OMCVD) technique. Among these compounds Cu(II) acetylacetonate, Cu(acac)_2, is a potentially important precursor for the deposition of Cu film and preparation of high T_e superconducting films. However, little information about the kinetics of thermal decomposition of this compound is available. In this paper we report a kinetic study on the deposition of copper film by decomposing Cu(acac)_2. A CW CO_2 laser is used to heat a quartz substrate and to induce thermal decomposition on the surface. The deposition rate is measured in situ by monitoring the transmittance of the Cu film on the substrate with a He-Ne laser. As the CO_2 laser beam only heats the quartz window, the temperature of the reaction cell can be controlled. The dependenc(?) of the deposition rate on the laser intensity is determined at a given vapor pressure of Cu (acac)_2 and a laser intensity threshold has been observed. Above the threshold the deposition rate increases linearly with laser intensity in the low intensity region. The laser-induced temperature rise of the substrate and the deposition rate constant have been calculated. The Arrhenius plot is linear and the activation energy for thermal deposition of Cu(acac)_2 is 181±19kJ·mol~(-1). In higher laser intensity region the deposition rate becomes independent on the laser intensity, but is a function of the vapor pressure of Cu(acac)_2. The decomposition of Cu(acac)_2 has been found to be first order. The rate-controlling step seems to be the surfaoe reaction on the substrate at low laser intensity, while the transport of precursor molecules is crucial at high laser intensity.

金属有机化合物气相化学沉积(OMCVD)形成铜膜常用的母体化合物是铜(II)的β-二酮类配合物.本文首次采用CW二氧化碳激光研究二(乙酰丙酮根)合铜(II)[Cu(acac)_2]在石英基片上沉积铜膜过程的动力学.沉积速率由探测光束(He-Ne激光)通过铜膜时透过率的衰减进行实时测量.实验表明,二氧化碳激光辐照功率对沉积速率有明显的影响,并存在一阈值.在较低功率区域内,Cu(acac)_2在表面上热分解反应是沉积速率控制步骤.由Arrhenius关系已求得表面热分解反应的表观活化能为181 kJ/mol.在较高功率的区域内,沉积速率趋于恒定,可以认为此时气相Cu(acac)_2分子向表面扩散的传质过程是沉积速率控制步骤.沉积速率随外加惰性气体压力增加而下降,并测得与Cu(acac)_2蒸气压力之间呈一级反应关系.对Cu(acac)_2热分解机理作了讨论.

 
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