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粉体颗粒
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  powder particle
     Sphere in shape, the manufactured nanometer zirconia powder particle are even in size with their diameters ranging from 20 to 40 nm under the TEM and SEM, and they have a narrow distribution of particle size with excellent dispersant adequacy.
     通过透射电子显微镜(TEM)和扫描电子显微镜(SEM)的分析发现,制得的纳米氧化锆粉体颗粒呈球形、直径在20~40nm之间、大小均匀、粒度分布窄、分散性良好。
短句来源
     The impact of powder particle flow of different R/D on the bend's pressure drop and pipe wall wear is also discussed.
     并讨论了不同R/D的粉体颗粒流动对弯管压力降及管壁磨损的影响。
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     The effect of ZnO powder particle size distribution on MLCV electric performance is studied.
     主要采用两种不同颗粒细度的 ZnO 粉体来研究粉体颗粒细度对多层片式氧化锌压敏电阻器性能的影响。
短句来源
     Effect of Powder Particle State on the Properties of Dry-pressed Anisotropic Permanent Magnetic Strontium Ferrite
     粉体颗粒状态对干压各向异性SrFe_(12)O_(19)永磁铁氧体性能的影响
短句来源
     The result shows that,by means of the intellective FD method,the shape of powder particle,the statistical distribution features can be quantitatively described.
     结果表明 :通过智能分形法可以定量描述粉体颗粒形状以及统计分布特点。
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  powder particles
     Study on Microstructure of Powder Particles by TEM
     粉体颗粒微观结构的透射电镜研究
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     Analysis of Efflux Pulverization Dynamics and its Influence on the Shape of the Powder Particles
     射流粉碎动力学分析及对粉体颗粒形状的影响
短句来源
     The gas-solid two-phase flow is investigated numerically for the moderate phase pneumatic conveying in 90° bends. And the pressure drops(Δp) are calculated by homogeneous and non-homogeneous powder particles flowing through 90° bends from horizontal to vertical,and from vertical to horizontal with different ratios(R/D=1.5~6.0) of curvature radius and the pipe diameter.
     对于中等浓度气力输送90°弯管内的气固流动状态进行数值模拟研究,并对水平转垂直、垂直转水平,不同弯径比(R/D=1.5~6.0)的90°弯管,均匀和非均匀粉体颗粒流过弯管的压力降Δp进行了模拟计算。
短句来源
     Magnetic powder particles, which were used for the preparation of magnetic fluids, were modified with a surfactant, oleic acid. The coating on the surface of the magnetic particles was evaluated by UV, and the effects of pH, temperature and time on the surface treatment were analyzed.
     采用油酸作为表面活性剂对磁流体制备过程中磁性粉体颗粒进行表面处理,并试图用紫外光谱分析方法对其表面改性效果进行定量评估,分析了pH值、温度和时间对磁性粉体颗粒表面修饰的影响。
短句来源
     The result indicates that the mean size of powder particles is about 200nm,the agglomerated particle after freeze-drying is smaller than that of after constant temperature drying,that is,freeze-drying can relieve particle's agglomeration in the super fine powder synthesizing process through liquid phase method.
     结果表明,所制得的粉体颗粒平均尺寸约为200nm,采用冷冻干燥的共沉淀产物的团聚体比恒温干燥的小,说明在液相法制备超细粉体过程中采用冷冻干燥可以减轻颗粒之间的团聚.
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  “粉体颗粒”译为未确定词的双语例句
     TEM observation of Ni/Al_2O_3 powder shows the particle shape of Ni/Al_2O_3 is globe with size of 50~60 nm.
     利用TEM对Ni/Al_2O_,复合粉体进行观察,发现Ni/Al_2O_3复合粉体颗粒呈球形,大小为50~60nm;
短句来源
     TEM observation shows the shape of Ni/Al_2O_3 particle is globoid and the particle size is 50~60 nm.
     利用TEM对Ni/Al2O3复合粉体进行观察,发现Ni/Al2O3复合粉体颗粒成球形,大小为50~60nm;
短句来源
     The result showed that the average size and uniformity degree of Bi4Ti3O12 powder increased with the increasing of excessive nonstoichiometry Bi2O3 content,and the average size reached the best value of 8~10 μm at the 7.5% of excessive Bi2O3.
     研究表明,随着Bi2O3过量程度的增加,所得Bi4Ti3O12粉体颗粒的平均尺寸和均匀程度均增加,当Bi2O3过量7.5%时达到最佳值,其平均粒径为8~10μm.
短句来源
     The outcome of contained 7.69%Al and 10%Al Zn-Al alloys are very big (350nm).
     利用Zn-7.69%Al和Zn-10%Al合金制备的ZnO粉体颗粒出现了一些大的颗粒(350nm)。
短句来源
     As-prepared Pb(Ti0.48Zr0.52)O3 minicrystals were characterized using XRD and SEM. Our results indicate that uniformly distributed Pb(Ti0.48Zr0.52)O3 minicrystal with little coalescence can be synthesized using the above method,the grain diameter range is 0.5~1.0 μm.
     对水热合成的Pb(Ti0郾48Zr0郾52)O3粉体用XRD和SEM进行表征,得到了颗粒均匀、团聚少、粒径0郾5~1郾0μm的Pb(Ti0郾48Zr0郾52)O3粉体颗粒
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  powder particle
The dependences of the powder particle size on the oxygen concentration and overheating of the exploding metal are discussed.
      
It has been shown that the relative width of the pore-size distribution is virtually independent of powder particle sizes.
      
The strength and morphology of granules generated by high shear agglomeration of powder with a highly viscous surfactant paste were investigated as a function of mixing time and powder particle size.
      
The sintering behavior of NiFe2O4-10NiO/xNi cermet which was used as the most prospective inert anode materials for aluminum electrolysis was studied by examining the effects of raw powder particle size, sintering temperature, and the contents of Ni.
      
Attenuation values in a sintered compact are shown to follow a simple Rayleigh scattering dependence on frequency which yields a powder particle size consistent with the known value.
      
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  powder particles
A model describing a supersonic high-temperature gas flow containing powder particles is constructed.
      
Among a whole series of technological problems, attention is concentrated on the behavior of the powder particles in a supersonic jet of high-temperature gas.
      
The protective properties of the layer covering the powder particles were found to be determined by oxide and organosilicon compounds.
      
Examination by the layer self-arrangement method, scanning electron microscopy, and atomic-force microscopy showed that the powder particles are spherical aggregates from 0.4 to 2.0 μm in size, consisting of nanoparticles 16-30 nm in diameter.
      
Unusual piezoresponse signals have been observed in glycine aminoacid powder at a frequency near 10 MHz, which exhibited a regular pattern in time determined by a periodic phase variation in the elastic vibrations of individual powder particles.
      
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According to the fact that the main heat exchange between powder particles (d_p≤150μ) and hot gas occurs in the heat exchange tubes with the cyclones acting merely as dust collectors,two theoretical formulae of thermal efficiency,one for single stage preheater and the other for multistage preheater,are presented here. ψ_Π=[η(T_(go)-T_(Po))]/[(T_(go)+ZC_PT_(Po)/C_g)(1+C_g/ZC_P)] (1) ψ_Π=η_1η_2((1-η_1+η_1η_2)/Z+C_P/C_g))(1-T_(Po)/T_(go))/(1-η_1+η_1η_2)(T_(Po)C_P/T_(go)C_g+1/Z)(1+η_1C_PZ/C_g+(1-η1+η_1η_2)/Z C_G/C_P))...

According to the fact that the main heat exchange between powder particles (d_p≤150μ) and hot gas occurs in the heat exchange tubes with the cyclones acting merely as dust collectors,two theoretical formulae of thermal efficiency,one for single stage preheater and the other for multistage preheater,are presented here. ψ_Π=[η(T_(go)-T_(Po))]/[(T_(go)+ZC_PT_(Po)/C_g)(1+C_g/ZC_P)] (1) ψ_Π=η_1η_2((1-η_1+η_1η_2)/Z+C_P/C_g))(1-T_(Po)/T_(go))/(1-η_1+η_1η_2)(T_(Po)C_P/T_(go)C_g+1/Z)(1+η_1C_PZ/C_g+(1-η1+η_1η_2)/Z C_G/C_P)) (2) The analysis equations with respect to the maximum of ψ_1 and ψ_n are also given in this paper.All the above relationships which are bac- ked by experimental data can be used as a guide for the development of new types of powder preheater and the operation of existing preheat- er. Theoretical analysis shows that the three most important ways to heighten thermal efficiency of a preheater are to increase (1) the solid-gas feed ratio,(2) the number of stages,and (3) the sepa- ration efficiency of each stage.

粉体颗粒(dp<150μ)与高温气流在换热管中的热交换是瞬间完成的基本事实出发,本文从理论上推出了单级和多级粉体预热器热效率及其它们最大值的解析式。指出粉体预热器的热效率与气固起始温度、固气比、各级预热单元的分离效率及气固相的物性参数等有关。应用上述解析式可得最佳设计和最优操作参数。理论研究表明:在尽可能的情况下,提高各级预热单元的分离效率、加大固气比,增加预热单元的级数是提高系统热效率的三大重要途径。

Tetragonal pure zirconia powders which can partially transform to monoclinic phase under stress inducement were prepared by controlling the final pH for precipitation of zirconia gel and the particle size. It is estimated that the transformation critical particle size of tetragonal pure zirconia powders is less then 180A,and the metastabilization of tetragonal pure zirconia powders is controlled both by the structure of zirconia gel precursor and the critical particle size.

通过控制沉淀过程pH值以及粉体颗粒度,制得了一种四方相纯氧化锆粉体。在应力诱导下,这种四方相纯氧化锆粉体部分能发生相变。其相变临界粒径小于180A,它的亚稳保留受凝胶先驱体结构及临界粒径双重控制。

BaTiO_3 powder prepared by coprecipitation of barium oxalic titanate was chosen as matrix material and a magnesic organic salt solution containing 5wt% MgO was added for coating MgO on particle surface of the powder. Magnesic organic salt solution was synthesized by MgCO_3.The solution was completely dispersed in BaTiO_3 matrix in proportion by ball milling or high-speed stirring or ultrasonic dispersing. As a result, magnesic organic salt solution was uniformly coated on particle surface of the powder. The...

BaTiO_3 powder prepared by coprecipitation of barium oxalic titanate was chosen as matrix material and a magnesic organic salt solution containing 5wt% MgO was added for coating MgO on particle surface of the powder. Magnesic organic salt solution was synthesized by MgCO_3.The solution was completely dispersed in BaTiO_3 matrix in proportion by ball milling or high-speed stirring or ultrasonic dispersing. As a result, magnesic organic salt solution was uniformly coated on particle surface of the powder. The coated powder was sprayed and completely dried in vacuum oven at low temperature,then the white and loose precursor was obtained. After calcining at 800℃, BaTiO_3 superfire powder coated by MgO was obtained. Its average particle size is of 0.48μm(D_(50)) and 0.17μm (D_(?)), respectively. By characterizing the matrix, MgTiO_3 phase is formed and MgO nonexisted. The morphology of particles is spheroidal. The particle size is within 1000~3000A, but, a part of particles of the prepared powder is agglomerated. The ceramic material sintered by this kind of powder possesses finer grain (0.1 ~0.3μm), higher density and hardness as well as breaking voltage in compared with those prepared by conventional methods. It has also indicated that it is beneficial to prevent grain growth, enhance density and hardness of the sintered material and enlarge its sintering temperature range.

选取用草酞酸钡共沉淀法生产的BaTiO_3粉料为基体原料,加入5(wt)%MgO进行粉体颗粒表面改性。对粉体的表征及X-射线结构分析结果表明,Mg与基体表面充分反应,生成MgTiO_3新相,无游离MgO存在,一次颗粒形貌为球状,粒度均在100~300nm范围内,但颗粒团聚情况仍存在。用获得的粉料进行成瓷试验,制得细晶(1.00~300nm),高致密,而显微硬度与耐电场击穿强度都较一般的BaTiO_3基陶瓷高的试样。结果表明,加镁改性有阻止晶粒生长、提高致密度、扩大烧成温度范围和提高硬度的作用。

 
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