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transition diffusion
相关语句
  过度扩散
     According to the magnitude of average distance of oxygen molecular freedom motion at different temperature, comparing oxygen molecular diffusion rate of three kinds of diffusions through micropores, mesopores and macropores with combustion rate (CR) of pulverized coal char (pcc), it is shown that CR is less than transition diffusion rate, and less one or more orders than molecular diffusion rate on particle surface within 2000 K.
     根据不同温度下氧分子平均自由程的大小,比较了小孔、中孔和大孔中三种扩散速率与煤焦表面燃烧速度的大小。 研究表明: 2000 K以内,颗粒表面分子扩散速率比氧化反应速率大1个数量级以上,过度扩散速率不小于氧化速率。
短句来源
  “transition diffusion”译为未确定词的双语例句
     Analysis is made on the diffusion mechanism of gas in coal pores according to the diffusion modes of gas in porous medium and the actual characters of coal structure, several diffusion modes are obtained including Ferction diffusion, Norseng diffusion, transition diffusion, surface diffusion and crystal diffusion, and analysis is also conducted on the factors affecting gas diffusion in coal seams and the applicable conditions of various diffusion modes.
     根据气体在多孔介质中的扩散模式,结合煤结构的实际特点,分析了瓦斯气体在煤孔隙中的扩散机理,得出瓦斯在煤体中有以下几种扩散模式:菲克型扩散、诺森扩散、过渡扩散、表面扩散和晶体扩散,并分析了煤层中影响瓦斯扩散的因素和各种扩散模式的适用条件。
短句来源
     fine grain ceramics (d=300~400 nm) obtained when sintered temperature is lower than (1 250 °C,)which exhibits the characteristics of low dielectric constant and phase transition diffusion;
     烧结温度低于1250°C时得到细晶粒陶瓷(d=300~400nm),表现出明显的低介电常数和相变弥散的特征;
短句来源
  相似匹配句对
     PHASE TRANSITION OF THE MODEL OF DIFFUSION LIMITED AGGREGATION
     扩散置限凝聚模型的相变
短句来源
     A Model of Transition from Smoldering to Flaming with Natural Diffusion
     自然扩散条件下阴然向有焰火转化的数理模型
短句来源
     Connection and Transition
     联系与过渡
短句来源
     Nonlinear Diffusion
     非线性扩散
短句来源
     and transition phase.
     转变 ,并析出过渡相。
短句来源
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  transition diffusion
Improving the structure of transition diffusion zones in composites of nichrome+alloyed molybdenum
      
This top-down process does not resemble the transition diffusion at its onset in Europe which had a strong geographical component.
      


Analysis is made on the diffusion mechanism of gas in coal pores according to the diffusion modes of gas in porous medium and the actual characters of coal structure, several diffusion modes are obtained including Ferction diffusion, Norseng diffusion, transition diffusion, surface diffusion and crystal diffusion, and analysis is also conducted on the factors affecting gas diffusion in coal seams and the applicable conditions of various diffusion modes.

根据气体在多孔介质中的扩散模式,结合煤结构的实际特点,分析了瓦斯气体在煤孔隙中的扩散机理,得出瓦斯在煤体中有以下几种扩散模式:菲克型扩散、诺森扩散、过渡扩散、表面扩散和晶体扩散,并分析了煤层中影响瓦斯扩散的因素和各种扩散模式的适用条件。  

BaTiO_3 ceramics sintered at different temperature is prepared from powders synthesized by high gravity reactive precipitation (HGRP). The microstructure and dielectric properties are studied by SEM and impedance analyzer. The results show that: the microstructure of ceramics especially the grain size has great effect on dielectric properties; fine grain ceramics (d=300~400 nm) obtained when sintered temperature is lower than (1 250 °C,)which exhibits the characteristics of low dielectric constant and phase...

BaTiO_3 ceramics sintered at different temperature is prepared from powders synthesized by high gravity reactive precipitation (HGRP). The microstructure and dielectric properties are studied by SEM and impedance analyzer. The results show that: the microstructure of ceramics especially the grain size has great effect on dielectric properties; fine grain ceramics (d=300~400 nm) obtained when sintered temperature is lower than (1 250 °C,)which exhibits the characteristics of low dielectric constant and phase transition diffusion; ceramics obtained when sintered temperature is up to or higher than (1 250 °C) is out of the range of fine grain ceramics. When sintered temperature is 1 300 °C ceramics with grain size of 3~4 μm is prepared and the ambient dielectric properties are better than that of coarse grain ceramics.

以超重力反应沉淀法制得的纳米BaTiO3为初始粉体,在不同温度烧结得到BaTiO3陶瓷。分别用SEM和阻抗分析仪测试陶瓷微结构和介电性能。结果表明:陶瓷微结构尤其晶粒尺寸对陶瓷介电性能影响极大;烧结温度低于1250°C时得到细晶粒陶瓷(d=300~400nm),表现出明显的低介电常数和相变弥散的特征;烧结温度达1250°C时得到陶瓷超出细晶粒陶瓷范围,烧结温度为1300°C时,得到陶瓷晶粒尺寸为3~4μm,室温介电性能优于粗晶粒陶瓷。

The morphology and formation mechanism of the microstructure of the composite ion-nitrided plus chromized layers obtained at various chromization temperatures in a plain low-carbon steel (steel 20) were investigated using metallography, X-ray diffraction and microanalysis. It was found that the surface zone of the composite-chromized layers obtained at various temperatures was composed of the phases CrN (fcc), β-Cr2N (hcp) and α-(Cr, Fe) (bcc), in which the fraction of α-(Cr, Fe) decreased with increasing the...

The morphology and formation mechanism of the microstructure of the composite ion-nitrided plus chromized layers obtained at various chromization temperatures in a plain low-carbon steel (steel 20) were investigated using metallography, X-ray diffraction and microanalysis. It was found that the surface zone of the composite-chromized layers obtained at various temperatures was composed of the phases CrN (fcc), β-Cr2N (hcp) and α-(Cr, Fe) (bcc), in which the fraction of α-(Cr, Fe) decreased with increasing the chromization temperature. During chromization of the nitrided layer, the diffusion-controlled reaction transformation occurred within the white (compound) layer of the former nitrided layer, forming a white composite-chromized layer. Meanwhile, the precipitation/eutectoid reaction took place in the transition (diffusion) zone of the nitrided layer during air cooling from a chromization temperature at or above 580 ℃, resulting in the formation of a γ' nitride precipitate zone and/or an (α+γ') eutectoid zone similar to the pearlitic structure.

应用金相、X射线衍射和微区成分分析研究了20钢经离子氮化后在不同温度渗铬(复合渗铬)所得渗铬层的显微组织及其生成机制.不同温度复合渗铬层的表面层均由CrN(fcc),β-Cr2N(hcp)和α-(Cr,Fe)(bcc)组成,其中α-(Cr,Fe)的含量随渗铬温度提高而减少.在复合渗铬过程中,原先的氮化白亮层发生扩散反应相变,生成复合渗铬白亮层,而扩散层中的相变主要是析出/共析转变,生成γ’氮化物析出带和/或一种类似珠光体的(α+γ’)共析反应带.

 
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