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层理论     
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  layer theory
     New results about the existence of the positive solutions to a singular integral equation are obtained in the form of w(t)=∫~1_t(1-s)(λ+λs+s)ds+(1-t)∫~t_0w(s)ds,t∈(0,1),in the boundary layer theory.
     对边界层理论新结果中出现的一类奇异积分方程w(t)=∫1t(1-s)(wλ(+s)λs+s)ds+(1-t)∫0tw(ss)ds,t∈(0,1)进行讨论,并得出了上述方程在λ∈(-21,0)上正解存在性的新结果。
短句来源
     The positive solutions of a class of second-order nonlinear singular boundary value problem(ρ(t)g'(t))+q(t)f(t,g)+h(t)=0,0layer theory.
     利用奇异摄动法技巧,对源于流体边界层理论中的一类奇异非线性边界值问题(ρ(t)g′(t))′+q(t)f(t,g)+h(t)=0,0
短句来源
     In this paper, the finite element analysis software ANSYS is successfully applied to simulate the filling process of PIM. Fractal and Chaos, Two-phase flow, Boundary layer theory are applied to study PIM process.
     本文用有限元分析软件ANSYS对PIM过程进行模拟,把分形混沌理论、两相流理论和边界层理论应用于PIM过程的研究,针对PIM充模流动过程模拟中亟待解决的一些问题进行了一系列的基础理论研究和数值模拟分析。
短句来源
     Simulation of the Impeller Based on Boundary Layer Theory
     基于边界层理论的叶轮的仿真
短句来源
     The 3-D semulation model of a impeller that based on the blade type line equation derived from boundary layer theory has been set up with pro/E.
     根据边界层理论推导的叶片型线方程,用pro/E建立了叶轮的三维仿真模型。
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  strata theory
     Study and application of key strata theory in ground control
     岩层控制的关键层理论及其应用
     This study is the development of key strata theory in ground control research, which will strongly promote the development of the key strata theory in ground control and its technique.
     本项研究是岩层控制的关键层理论研究的深入和发展,将有力促进岩层控制理论和技术的发展.
短句来源
     Based on the key strata theory of the ground control and analyzing the condition of geology and mine in the shallow coal seam, the characteristic parameters of the key strata are educed.
     基于岩层控制关键层理论,在分析浅埋煤层地质采矿等条件下,得出了浅埋煤层关键层的特征参数。
短句来源
     The basic concepts of key strata theory in ground control are introduced, the order of two hard strata fracturing and the loading distribution on key strata have been studied, the complex effect between key strata , the characteristics of loading changing on key strata have been revealed.
     介绍了岩层控制关键层理论的基本概念,研究了两层硬岩层同步破断的条件及关键层上载荷分布,揭示了关键层破断的复合效应和关键层上载荷的动态与非均布特征.
     The research emphasis about key strata theory in the future are been indicated.
     最后指出了关键层理论下一步研究的重点.
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  layers theory
     The dispersion ,double electrical layers theory, drying methods, surface modification and characterization methods in preparing process of nanometer particles were introduced in this article.
     介绍了纳米粒子制备过程中的分散、表面双电层理论、干燥方法、表面修饰与表征方法。
短句来源
  stratum theory
     STUDY AND APPLICATION OF DOMINANT STRATUM THEORY FOR CONTROL OF STRATA MOVEMENT
     岩层控制关键层理论的应用研究与实践
短句来源
     To disclose the different deformation features of roadway affected by strip mining,in this paper through the displacement field measurement and the physical simulation of one strip mining roadway,based on the key stratum theory and roof movement theory,its deformation is analyzed and studied.
     为了揭示条带开采下巷道的特殊变形规律,通过某矿一条条带开采巷道的顶底板及两帮闭合变形的实测结果,结合实验室相似模拟实验的结果,采用最新的岩层移动理论——关键层理论及一般矿压分析理论——顶板回转理论等对现场监测及实验室实验的结果进行了系统分析研究。
短句来源
     Based on the key stratum theory, the structure characteristics and movement laws of overlying strata with different mining height are studied.
     运用关键层理论研究了采场覆岩结构特征及运动规律.
短句来源
     This paper analyzed the formation of fully-mechanized sublevel coal caving face overburden large structure by using the new research production of underground pressure theory Key stratum theory, elasticity mechanics and structure mechanics theory, brought forward its conception and model, and carried through mechanics analysis on the model, and presented the two possible movement patterns mechanics criterion of overburden large structure.
     论文采用矿压理论的最新研究成果“关键层理论”、弹性力学与结构力学理论对综放采场覆岩大结构的形成进行分析,提出综放采场覆岩大结构概念、建立力学模型并对模型进行力学分析计算,给出了覆岩大结构两种可能运动方式的力学判据。
短句来源
     The rules of deformation, separation and fracture of the strata affected by the key stratum behaviour are studied in detail. Bassed on the key stratum theory, a stucture model of the overlying strata is given. This theory provides a unified thinking and for study of strata displacement and strata behaviour in longwall mining.
     首次提出了采场上覆岩层活动中的关键层理论,建立了关键层的判别准则,深入研究了在关键层作用下岩层的变形、离层及断裂规律根据关键层的作用特性,描述了采场上覆岩层活动中的整体结构形态关键层理论的建立为岩层移动和采场矿压研究提供了一种统一思想和方法
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  layer theory
The Newtonian shock layer theory for smooth surfaces has been developed in [1-7].
      
Universal equations of three-dimensional boundary layer theory
      
A solution is obtained, within the framework of the boundary layer theory, to the problem of the unsteady flow created by a two-dimensional jet source for a given momentum flux variation with time.
      
Propagation of a laminar jet of a thermodynamically equilibrious "gray" gas is examined in the boundary layer theory approximation.
      
The integral methods of boundary-layer theory are used to examine the interaction of a turbulent wake with the outer flow for the example of planar flow.
      
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作者应用了边界层理论中的分析解法来处理饱和蒸汽静止时膜状凝结放热的问题,相似理论的分析指明在膜状凝结放热的问题里有四个无因次量起着作用,它们是努谢尔特准则数 Nu 或代替它的雷诺准则数 Re,伽利略准则数 Ga,普朗特准则数 Pr 和一个焓的比值 K 准则数。在蒸汽静止和凝结液膜处于层流的范围内时,本文的分析说明凝结液膜中的速度分布是抛物线形的而温度分布是直线形的.文章说明膜状凝结放热的基本微分方程式组可以转化成一组动量与热量的积分关系式组.这组积分关系式组的解同克鲁其林的结果相符合.这个理论解对于 Pr>1和 K>5的情况来说,例如蒸汽在普通压力下凝结就是这样的,得到和努谢尔特公式一致的结果.但对于 Pr<1或K<5的情况来说,例如金属蒸汽的凝结就是这样的,本文的解对努谢尔特公式的修正是不可忽略的.文章并包括各种不同 Pr 数和 K 数时对努谢尔特公式的修正系数的图表.

In a previous paper[1], a theoretical analysis has been presented to the heat-transfer coefficient for laminar boundary layer flow in the entrance region of a circular tube. This is a succeeding one based on Karman's method of approach, to attack the entrance effect on flow-friction behavior of an isothermal boundary layer flow of incompressible fluid. The family of climensionless velocity profiles is well defined by eq. (3) and (4). The predicted friction coefficients from eq. (17) or (19), eq. (23), (25) and...

In a previous paper[1], a theoretical analysis has been presented to the heat-transfer coefficient for laminar boundary layer flow in the entrance region of a circular tube. This is a succeeding one based on Karman's method of approach, to attack the entrance effect on flow-friction behavior of an isothermal boundary layer flow of incompressible fluid. The family of climensionless velocity profiles is well defined by eq. (3) and (4). The predicted friction coefficients from eq. (17) or (19), eq. (23), (25) and (26), eq. (28) and (30) respectively are in good agreement with the complicated Langhaar's solution[6] and data reported in the literature[3,5,7,16].

本文是文[1]的继续。文中,在直圆管具有平滑进口及流体是不可压縮的假定下,对圆管进口段层流边界层发展区的流动阻力与壁面摩擦阻力作了环状边界层的理论分析,提供了常物性情况下的简捷近似計算解;并对新的实验资料及其經驗綜合式作了分析和討論,証明这些数据与以前文献中所报导的結果实质上相互符合,而文献[4]所推荐的綜合式还没有最真实地反映出原始数据的规律性。

On the basis of the theoretical analysis of the boundary layer and the calculation of the cascade losses by the use of the '' Optimal control technique'', a method of calculation of the optimum velocity distribution on the cascade surface in two-dimensional incompressible steady flow is presented. The mathbd is then extended to the compressible flow on arbitrary surface of revolution. It is proved that the optimum velocity distribution remains to be optimum when it is extended to cascade on arbitrary surface...

On the basis of the theoretical analysis of the boundary layer and the calculation of the cascade losses by the use of the '' Optimal control technique'', a method of calculation of the optimum velocity distribution on the cascade surface in two-dimensional incompressible steady flow is presented. The mathbd is then extended to the compressible flow on arbitrary surface of revolution. It is proved that the optimum velocity distribution remains to be optimum when it is extended to cascade on arbitrary surface of revolution in compressible fluid flow.

本文在边界层理论分析和叶栅损失计算的基础上,应用“最优控制论”方法,首先提供一个二元不可压稳定流动叶栅壁面最佳流速分布的理论计算方法,然后推广到可压缩流动的任意迴转面上。同时还证明了经推广后仍然是叶栅壁面的最佳流速分布。

 
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