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real materials     
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  真实材料
     Since it has the advantage of high calculating speed and it can fit the experimental results of most real materials, the model can be widely used in the analysis of static or dynamic viscoelastic problems in engineering.
     由于其计算速度快,能与大多数真实材料的性能实验结果相拟合,可以广泛应用于工程实际中的粘弹性静力和动力问题的计算。
短句来源
     Comparison with the experimental data measured on various real materials shows that, the present simulation algorithm and software are more suitable to predict the effect of the reinforced particles on thermal stability of the matrix grain structure than the theoretical models and computer simulations existed in literature.
     与多种真实材料实验数据比较研究表明,本文研究成果比文献中已有理论模型和仿真方法更适合于研究和预报复相材料中第二相粒子对基体晶粒组织热稳定性的影响规律。
短句来源
  真实的材料
     viewing the multi-brand strategy at TCL、Zhigao and Xinke as example, the author analyze the history、current situation and market practice of Kelon multi-brand one by one and try to evaluate the yes or no of multi-brand strategy at Kelon based on real materials.
     以TCL、志高、新科等多品牌战略为佐证,对科龙多品牌历史、现状及市场实践作了逐一剖析,希望以最真实的材料,对科龙多品牌战略的是与非作出最中肯的评价。
短句来源
     By selecting the real materials,holding the scientific approach and adopting the suitable method,The articale explained the first character istic scientific spirit of scientific papers then explained how to have a thorough grasp of this characteristics.
     从选取真实的材料、把握科学的观点和采用恰当的论证方法三个方面 ,阐述了科学性这一科技论文的首要特征 ,认为把握科学性的特征是写好科技论文的第一前提 ,并就如何把握这一特征进行了必要的阐释
短句来源
     Some documents written on bamboo and silk have been found in China since last century, it provides real materials for researching Chinese history.
     二十世纪以来出土的简帛文献,为汉语史的研究提供了极为真实的材料,具有很高的研究价值。
短句来源
     In this paper, according to the microscopic pictures, real materials (GaP nanopaticles aggregation) are analyzed in the way of complex network.
     本文利用显微照片对真实的材料(纳米GaP粒子在溶液中的凝聚体)进行了网络分析。
  实际材料
     5. The analytical integration of constitutive equations of real materials proposed by Wang Xucheng and writer is extended to plane stress and cycle elasto-plastic problems. It, combined with the total strain increment schem in stress calculation, raises the precision and efficiency to calculate stress.
     5.将作者提出的实际材料本构关系的解析积分推广应用于平面应力和循环弹塑性问题,结合应力计算的全应变增量方案,显著地提高了应力计算的精度和效率。
短句来源
     In this paper,the morphological structure of high-speed spinned polypro-pylene fibre uniaxial-and biaxial-oriented polypropylene film etched by ionbombardment were investigated with scanning electron microscope and the threedimensional oriented crystalline state of these real materials were studied.
     本文用扫描电镜观察了经离子刻蚀处理的聚丙烯单轴、双轴取向膜和高速纺丝的形态结构,研究了这些实际材料的三维结晶取向态。
短句来源
     Because the constitutive equations based on the strain equivalence principle for damaged materials do not reflect the damage behaviour of real materials, the constitutive functional expansion method(CFEM) is developed on the strict theoretical basis of irreversible thermodynamics, and by using the CFEM the constitutive equations for isotropic elastic damaged materials are derived.
     已经发现有效应力概念与应变等效假设存在较大缺陷,基于应变等效假设的损伤本构方程不能正确反映实际材料的损伤行为。 为克服经典连续损伤理论存在的缺陷,在严格的不可逆热力学理论基础上,提出了建立损伤本构方程的本构泛函展开法,推导出弹性各向同性损伤材料本构方程的一般形式。
短句来源
  现实材料
     The party-politics in England had developed into a high level then, which provided Engels more sufficient and more typical real materials than those in Germany and in France to study party-politics.
     这时的英国政党政治已经发展到比较高的水平,因而为恩格斯研究政党政治提供了远比德国和法国更为充足、更为典型的现实材料
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  real materials
In particular, differential equations of fractional order lead to relaxation functions coming very close to the relaxation behaviour of real materials.
      
Using properties of three widely different real materials, the wave propagating behavior, in terms of stress, pore pressure, displacement, and flux, are examined.
      
In the linear theory, it is shown that an exact equation, governing dilatational wave propagation, must be used for certain real materials.
      
In this study, a semi-empirical Lennard-Jones/embedded atom method model is used to capture real materials behavior through the introduction of many-body forces.
      
A semiempirical Lennard-Jones/Embedded Atom Method model is used to capture real materials' behavior through the introduction of many-body forces.
      
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We have determined the first several coefficients of the series formula (1) for superconducting Tc. For the double-σ spectrum as and that of several real materials, we have compared the Tc calculated from the series formula, the Allen-Dynes formula and the numerical solution of the Eliashberg Equation, respectively. The results suggest that when the series is convergent, the calculated results by using the series formula is a better approximation of the numerrieal solution than that from the A-D formula....

We have determined the first several coefficients of the series formula (1) for superconducting Tc. For the double-σ spectrum as and that of several real materials, we have compared the Tc calculated from the series formula, the Allen-Dynes formula and the numerical solution of the Eliashberg Equation, respectively. The results suggest that when the series is convergent, the calculated results by using the series formula is a better approximation of the numerrieal solution than that from the A-D formula.

本文定出超导临界温度T_c级数公式(1)的前几项系数。对于形式为 α_2F(ω)=λω/2[a_1δ(ω-ω_1)+(1-a_1)δ(ω-ω_2)]的双δ型有效声子谱及若干具体材料的谱,将级数公式计算的T_c与Allen-Dynes公式(以下简称A-D公式)及Eliashberg方程的数值解作了比较。计算表明,当级数(1)收敛时,级数公式计算的结果较A-D公式更接近于数值解。 此外,本文还给出了一个近似的T_c级数公式,得到了估计该T_c级数收敛半径的方法,并计算了若干材料的收敛半径值。因此,可估计级数公式(1)的适用范围。

The argument about the lower limit of Poisson's ratio for isotropic materialshas been continued for many years.Most people consider it as 0. Some peoplethink it to be-1,but they often make mistakes in theoritical deduction and findno real material with negative value of Poisson's ratio.In this paper,the authorhas made a theorical analysis of this ploblem and given a conclusion that Pois-son's ratio of the material with bulk modulus of elasticity less than two thirdsof modulus in shear is negative.Under...

The argument about the lower limit of Poisson's ratio for isotropic materialshas been continued for many years.Most people consider it as 0. Some peoplethink it to be-1,but they often make mistakes in theoritical deduction and findno real material with negative value of Poisson's ratio.In this paper,the authorhas made a theorical analysis of this ploblem and given a conclusion that Pois-son's ratio of the material with bulk modulus of elasticity less than two thirdsof modulus in shear is negative.Under the guidence of the theory,the authorhas firstly found the material with negative value of Poisson's ratio.That isfoamed plastics.

关于各向间性材料的泊松比的下限问题,已经争论了许多年。多数人认为是 0_。少数人认为是-1,但他们在理论推导上往往出错,而且一直找不到泊松比为负的实物。本文对这个问题作了理论上的分析,得出的结论是:体弹性模量小于剪切弹性模量的三分之二的材料,泊松比为负。在这种理论的指导下,笔者第一次找到了泊松比为负的材料--泡沫塑料。

Engineering materials always contains defects, such as dislocations, inclusions, cracks---, and many material physical properties are considerably changed by their presence. Specific investigations of their effects on the mechanical properties of materials can be backdated to Taylor's work on dislocations (1934 ( 1 )) , Eshel-by's elegant method on inclusions (1961 (2)) ,Bristow's study on microcracked solids (1960 (3)) , and Hashin and Shtrikman's powerful variational principle on inhomogeneous materials (1962...

Engineering materials always contains defects, such as dislocations, inclusions, cracks---, and many material physical properties are considerably changed by their presence. Specific investigations of their effects on the mechanical properties of materials can be backdated to Taylor's work on dislocations (1934 ( 1 )) , Eshel-by's elegant method on inclusions (1961 (2)) ,Bristow's study on microcracked solids (1960 (3)) , and Hashin and Shtrikman's powerful variational principle on inhomogeneous materials (1962 ( 4 )) .]t is known, however, that those non-statistical approaches do give reasonable estimates for the effective mechanical properties for some defectuous materials but they fail for others.This is due to the fact that the periodic defect array model or random model used in these approaches does not accurately represent the micro-structure of the material.Some improved models accounting for the material micro-structure are tnerefore needed. In real materials,too the different types of defects often co-exist. However, each of them was treated in a different way. It would be therefore convenient to find. a unified approach for the treatment of different types of defects.The purposes of this paper are concerned with the answering to these two problems. Using the approach of elastic multipole modeling of defects originated by Siems (5) , Kovacs (6) , Zhon. and Hsieh (7,8) , we develop accordingly a statistical theory based on micromechanics analysis which would make it possible to set up a bridge between the macroscopic continuum approximation and the discrete microstructure of micro-defects, and to derive the macro-properties of all types of solid defects from a common basis.Two illustrations are given. The first one is concerned with the study of the interaction of a macrocrack with distributed microcracks in an elastic solid.In this problem, the usual assumption of a uniform effective field for the treatment of cracked solids (see Hill (9) and Budiansky (10))may be not suitable since the existence of the macrocrack in a microcracked solid makes the stress field near the macrocrack tip varies rapidly. This has been noticed by Chudnovsky and Kachanov (1983 (11)) who studied the two-dimensional interaction of a crack with a field of microcracks distributed in the vicinity of the main crack, and by Zhon and Hsieh-(1984(l2))who gave the results of three-dimensional interaction of a crack with a field of micro-defects(including microcracks)in an elastic solid. These considerations based on a generalized self-consistent method, in which the effective stress field may be non-usiform, however arrived at a system of linear algebraic equations for the determination of large number of unknown-values of effective stress fields at the defect "centers" although they can be solved exactly in principle. Through this statistical theory, an attempt is made to reduce such a phenomenon resulting from the analysis of any discrete microstructure system to an appropriate macroscopic continuum approximation.In the case of the interaction problem, the system of discrete linear algebraic equations is reduced to a self-consistent linear integral equation for the determination of the average effective stress field, which may be solved more easily.The second application is concerned with the determination of effective elastic moduli of solids with micro-defects which maybe statistically inhomogeneous.

工程材料或多或少地含有某些缺陷,如位错,夹杂物,裂纹等等。这些缺陷的存存,往往严重地影响材料的物理性质。关于缺陷对材料机械性质的影响的专门研究可以追溯到1934年Taylor关于位错的工作,1961年Eshelby处理非均匀夹质物的巧妙方法,1960年Bristow关于含有微观裂纹的弹性体的研究以及1962年Hashin和Shtrikman处理非均匀弹性材料的变分原理。 我们知道这些非统计的方法确实能对某些含有缺陷的材料的有效机械性质给出合理的估计,但是在另外一些情形它们却不适用。这是由于在这些方法中所使用的缺陷的周期分布或均匀随机分布的假定并不真实地反映了材料的微观结构。因此有必要研究某种能考虑到材料微观结构的模型。此外,在实际材料中,不同类型的缺陷往往同时存在。可是以往处理不同的缺陷却要使用不同的方法。因此寻找出一种统一处理的方法可以使问题得以简化。 本文的目的就是要试图解决这两个问题。使用由Siems,Kovacs以及Zhou和Hsieh等发展起来的模拟缺陷的弹性多极子方法,对应地我们发展一个基于微观力学分析的统计理论。这个理论使我们有可能在缺陷的离散微观结构与宏观的连续近似之间建立起一座桥梁,并且可以...

工程材料或多或少地含有某些缺陷,如位错,夹杂物,裂纹等等。这些缺陷的存存,往往严重地影响材料的物理性质。关于缺陷对材料机械性质的影响的专门研究可以追溯到1934年Taylor关于位错的工作,1961年Eshelby处理非均匀夹质物的巧妙方法,1960年Bristow关于含有微观裂纹的弹性体的研究以及1962年Hashin和Shtrikman处理非均匀弹性材料的变分原理。 我们知道这些非统计的方法确实能对某些含有缺陷的材料的有效机械性质给出合理的估计,但是在另外一些情形它们却不适用。这是由于在这些方法中所使用的缺陷的周期分布或均匀随机分布的假定并不真实地反映了材料的微观结构。因此有必要研究某种能考虑到材料微观结构的模型。此外,在实际材料中,不同类型的缺陷往往同时存在。可是以往处理不同的缺陷却要使用不同的方法。因此寻找出一种统一处理的方法可以使问题得以简化。 本文的目的就是要试图解决这两个问题。使用由Siems,Kovacs以及Zhou和Hsieh等发展起来的模拟缺陷的弹性多极子方法,对应地我们发展一个基于微观力学分析的统计理论。这个理论使我们有可能在缺陷的离散微观结构与宏观的连续近似之间建立起一座桥梁,并且可以使我们从一个共同的基础上导出各种类型的缺陷体的宏观性质。 作为这个理论的具体应用,文中

 
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