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diffusion     
相关语句
  扩散
     Some New Discontinuous Galerkin Method For Convection-Dominated Diffusion Problems
     对流占优扩散问题的某些新型间断有限元方法
短句来源
     Traveling Wave Solutions and Global Attractor for Continuous and Discretized Reaction Diffusion Equations
     连续与离散反应扩散方程组的行波解及整体吸引子
短句来源
     Interaction, Social Capital and Technological Diffusion in Sustainable Development
     互动、社会资本与可持续发展中的技术扩散
短句来源
     Statistical Inference for Diffusion Processes
     扩散过程的统计推断
短句来源
     Research on the Technology of FTIR Spectra Analysis about Toxic Organic Compounds in the Atmosphere and the Establishment of Diffusion Models in the Indoor Air
     大气中有毒有机物FTIR光谱解析技术及其室内扩散模型建立的研究
短句来源
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  弥散
     Objective To investigate the influencing factors on Apparent diffusion coefficient(ADC) of diffusion-weighted image(DWI) in breast magnetic resonance imaging(MRI).
     目的研究乳腺磁共振成像(Magnetic resonance imaging,MRI)弥散加权像(diffusion-weighted image,DWI)中表观弥散系数(apparent diffusion coefficient,ADC)的影响因素。
短句来源
     First, diffusion weighted imaging was done with the single shot SE-EPI sequence, b=0s/mm~2, 400s/mm~2, 600s/mm~2, 800 s/mm~2, 1000s/mm~2; slice thickness, 5mm.
     先行弥散加权成像,采用单次激发SE-EPI序列,弥散加权系数b值取0 s/mm~2、400 s/mm~2、600 s/mm~2、800 s/mm~2、1000 s/mm~2,层厚:5.0mm。
短句来源
     Intestinal metaplasia gastric cancer vs. diffusion gastric cancer, OR=1.11(95%CI: 0.87-1.42);
     肠型与弥散型胃癌的OR =1 11(95 %CI 0 87~ 1 42 ) ;
短句来源
     Materials and Methods: Using a GE 1.5T super conduct MR unit, 16 grade 1-2 astrocytomas and 16 grade 3-4 astrocytomas underwent conventional MR imaging ,including T1WI,T2WI,FLAIR,diffusion tensor imaging and T1WI with intravenous contrast.
     材料和方法:采用GE1.5T超导MR成像系统,对16例1~2级星形细胞肿瘤及15例3~4级星形细胞肿瘤进行了MRI检查,检查序列包括T_1WI、T_2WI、FLAIR、弥散张量序列(diffusion tensor imaging,DTI)及增强后T_1WI。
短句来源
     Quantitative Studies of Diffusion Weighted Imaging Using 3.0T MR in Rat C6 Glioma Models
     3.0T MRI鼠脑C6胶质瘤模型弥散加权成像定量研究
短句来源
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  扩散的
     Study on the Physical Properties,Point Defects and Atomic Diffusion in Intermetallics by a Modified Analytic EAM Model
     金属间化合物物理性能、点缺陷及扩散的改进分析型EAM模型研究
短句来源
     Investigation on Phase Equilibriums, Phase Transformation and Diffusion at Low Cu Side in Al-Zn-Cu Ternary System
     Al-Zn-Cu三元系低Cu侧相平衡、相变与扩散的研究
短句来源
     Research on the Environment and Mechanism of Technology Innovation Diffusion
     技术创新扩散的环境与机制研究
短句来源
     A Study on Design, Preparation of Refractory Ceramic Coating Materials Containing Nano-Nickel Particles, Properties of the Coating, Interface Reaction and Elements Diffusion between Substrate and the Coating
     含纳米Ni粉高温陶瓷涂层材料的设计、制备和涂层性能、界面反应及元素扩散的研究
短句来源
     The Study for the Mathematical Ecology Models with Diffusion and Cross-diffusion
     带扩散和交叉扩散的生态数学模型的研究
短句来源
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  漫射
     A set of relevant datafor the optical parameter of phantom was found as follows: scattering coefficient 306.5cm~(-1), absorption coefficient 0.1cm~(-1), mean cosine of scattering angle 0.86, diffusionlength 0.22cm and diffusion coefficient 0.012cm.
     一组优选的模型光学数据如下:散射系数306.5cm~(-1),吸收系数0.1cm~(-1),平均散射余弦0.86,漫射长度0.22cm和漫射系数0.012cm。
短句来源
     PRECISION ANALYSIS OF DIFFUSION APPROXIMATION THEORY
     漫射近似理论的精度分析
短句来源
     Study on Second-order Theory of Diffusion Equation in Multiple-scattering Media with Photon Density Wave
     多散射介质中光子密度波漫射方程的二阶理论研究
短句来源
     The Steady-state Study of Diffusion Equation for A Four-layered Matched Medium
     四层匹配介质漫射方程的稳态研究
短句来源
     MONTE CARLO SIMULATION OF AUTO-CORRELATION OF DIFFUSION PHOTONS MODULATED BY ULTRASOUND
     超声调制漫射光子自相关的Monte Carlo模拟
短句来源
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  diffusion
Aqueous and organic solvent extracts tested by agar-well diffusion method against 12 human pathogenic bacteria and 3 fungal strains showed activity to most of the organisms.
      
The Alternating Segment Crank-Nicolson scheme for one-dimensional diffusion equation has been developed in [1], and the Alternating Block Crank-Nicolson method for two-dimensional problem in [2].
      
In this paper for the two-dimensional diffusion equation, the net region is divided into bands, a special kind of block.
      
This paper analyses a mathematical model of the pattern formation on the shell of molluscs which is actually a kind of reaction-diffusion system.
      
Exact solutions for Belousov-Zhabotinskii reaction-diffusion system
      
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Equations determining the velocity and density distributions within the mixing region of two incompressible gases with different densities are set up, their temperatures being assumed to be the same. For incompressible mixing the total number of gas molecules per unit volume is constant, although the density of the gaseous mixture varies from point to point due to diffusion of matter. As an illustration we consider the plane jet and steady motion. The boundary layer method of approximation can still be...

Equations determining the velocity and density distributions within the mixing region of two incompressible gases with different densities are set up, their temperatures being assumed to be the same. For incompressible mixing the total number of gas molecules per unit volume is constant, although the density of the gaseous mixture varies from point to point due to diffusion of matter. As an illustration we consider the plane jet and steady motion. The boundary layer method of approximation can still be applied. The boundary of the jet is shown to be the same as that for one fluid. The solution of the problem then depends upon the numerical value of the coefticient of viscosity of the mixture which is a function of the number of molecules of each constituent gas in the unit volume. The present method of investigation is applicable to the cylindrical and half jets and also to the case where the two gases are at different temperatures.

本文求出规定二不能压缩气体的分片合流运动时,速度与质量密度分布的微分方程式。假定两种气体的密度不同但温度则相等。不能压缩的定义是每单位体积中的两种气体分子数的和不变。本文只讨论一平面守恒注中所需要的微分方程式。粘滞流体运动中之边界近似法仍可应用。同样方法亦可用到守恒圆柱体注,半注及气体中温度不同诸问题。

Creep under very small torsional stress has been investigated for 99.95% polycrystalline iron in the temperature range of 350°-525℃. The general features of the creep curves obtained are essentially the same as those previously reported for 99.991% aluminum. The creep is shown to be consisted of two parts, one occurring at lower temperatures or shorter times and the other at higher temperatures or longer times. The first part of the creep is limited in extent and is associated with the viscous behavior of grain...

Creep under very small torsional stress has been investigated for 99.95% polycrystalline iron in the temperature range of 350°-525℃. The general features of the creep curves obtained are essentially the same as those previously reported for 99.991% aluminum. The creep is shown to be consisted of two parts, one occurring at lower temperatures or shorter times and the other at higher temperatures or longer times. The first part of the creep is limited in extent and is associated with the viscous behavior of grain boundaries. The activation energy for this grain-boundary creep is 78,000 ± 4,000 calories per mole according to the present creep and stress relaxation measurements. This value is close to the activation energy for self-diffusion of iron, a correlation which indicates that, in so far as to the mechanism of atomic migration is concerned, grain boundaries may not be very different from the interior of the grains.

用99.95%的多晶纯铁作了从350°-525℃的扭转微蠕变及应力弛豫试验,所得结果的概貌与以前用多晶纯铝所得的基本上相同。从蠕变曲线上可以看出这蠕变是由两部分组成的:第一部分是在较低温度或较短时间内发生的,第二部分是在较高温度或较长时间内发生的。第一部分的蠕变是有限的,是由于晶粒间界的粘滞性滑移所引起。根据微蠕变及应力弛豫测量的结果,这一部分蠕变所包含的激活能是78,000±4,000卡/克分子。这个激活能(晶粒间界滑移激活能)的数值与纯铁自扩散的激活能很相近,表示晶粒间界与晶粒内部对于原子迁移的基本过程而言并没有显著的差异。 加碳于纯铁中对于这两部分的蠕变都有显著的影响。最值得注意的结果是含碳量少到0.0004%时已经使晶粒间界的粘滞性滑移受到显著的阻碍。这些发现在控制金属高温蠕变的问题上指出一个一般性的原则,对于以前所提出来的晶粒间界空穴模型也提供了一些新的实验证据。 根据加碳的实验结果,对于第二部分高温蠕变的机构也提出了一个初步的看法,这蠕变所包括的基本过程可能是晶粒内部的空穴中的原子重新排列。

It is well-known that blue brittleness and temper brittleness of steel are related to diffusion and precipitation in steel. An attempt was made in the present research to investigate this problem by means of internal friction measurements. Experiments show that the diffusion of carbon in α-iron is not affected by carbon concentration, alloying elements and the stage of precipitation in iron. The diffusion of nitrogen in α-iron is, however, hindered by the addition of alloying elements, and...

It is well-known that blue brittleness and temper brittleness of steel are related to diffusion and precipitation in steel. An attempt was made in the present research to investigate this problem by means of internal friction measurements. Experiments show that the diffusion of carbon in α-iron is not affected by carbon concentration, alloying elements and the stage of precipitation in iron. The diffusion of nitrogen in α-iron is, however, hindered by the addition of alloying elements, and is enhanced during the initial stage of precipitation.

一般认为钢的变脆例如蓝脆和回火脆都与钢中的扩散和沉淀有关系。本文尝试用内耗测量的方法研究碳与氮在α-铁及碳素钢中的扩散、脱溶和沉淀,从而进一步地了解钢的变脆的机构。实验的结果指出,碳在α-铁中的扩散不受自身浓度、合金元素和沉淀历史的影响。氮的情形与碳显著不同,合金元素使氮的扩散变慢,在沉淀初期使氮的扩散加速。 较有系统地研究了碳、氮在加工后的α-铁中脱溶时所引起的内耗峰(当振动频率约为每秒1周时出现在250℃左右),发现了高温淬火在含碳或氮较多的试样中所产生的内应力也可以引起这个内耗峰。实验指出:①这个脱溶内耗峰的出现条件与钢的蓝脆的出现条件相同,都是一种应变时效或淬火时效的现象;②与这个内耗峰有关的碳、氮是处于原子的状态。这些联系使我们认为钢的蓝脆是一种应变脱溶或淬火脱溶的过程,是由于原子状态的碳或氮聚集于钢中的内应力区域或晶体缺陷(例如原子脱节)中所引起来的。关于这方面的深入研究正在继续进行中。 根据本实验及以前关于钢铁中碳氮的扩散、脱溶和沉淀所得的结果,对于钢的回火脆的机构也提出了一种初步的看法。回火脆是一种回火沉淀的过程,引起回火脆的沉淀似乎是氮化物而不是碳化物。

 
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