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数值     
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  numerical
    A STUDY OF NUMERICAL METHODS FOR LIMIT AND SHAKEDOWN ANALYSES OF STRUCTURES AND THEIR ENGINEERING APPLICATIONS
    结构极限与安定分析的数值方法研究及其工程应用
短句来源
    Numerical Simulation and Nonlinear Dynamic Analysis of Gas-Solid Two-Phase Flow
    气固两相流动数值模拟及其非线性动力学分析
短句来源
    Numerical Calculation of Hydrodynamics of Three Dimensional Ship Hull Based on B-Splines
    基于B样条的三维船体水动力数值计算研究
短句来源
    Numerical Study of Compressible Mixing Layer with BGK Scheme
    应用BGK格式对可压缩混合层的数值研究
短句来源
    Direct Numerical Simulation of Spatial Smooth Pipe Flow Transition
    空间发展光滑圆管流动转捩的直接数值模拟
短句来源
更多       
  numerically
    Projection Methods for Numerically Solving Incompressible Flow
    数值求解不可压缩流动的投影方法
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    STUDIES ON NUMERICALLY SOLVING NONLINEAR PROBLEMS OF VISCOUS INCOMPRESSIBLE FLOW USING GREEN'S FUNCTION METHOD
    利用格林函数方法数值求解不可压粘性流非线性问题的研究
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    Numerically Solving Non-Linear Convection-Diffusion Equation by Follow-Flow Method
    用随流方法数值求解非线性对流扩散方程
短句来源
    APPLICATION OF TVD FORMAT IN NUMERICALLY SOLVING THE TWO-PHASE SEEPAGE FLOW QUESTION
    TVD格式在数值求解两相渗流问题中的应用
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    To avoid grid motion induced error, the geometric conservation law (GCL) is satisfied numerically.
    为避免网格运动给数值解带来额外误差,给出了几何守恒律的离散形式并在数值上满足了几何守恒律条件。
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  a numerical
    A Numerical Similitude of a Gas Centrifuge Flow Field
    高速旋转气体离心机流场的数值模拟
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    A NUMERICAL SIMULATION OF VORTEX MERGING IN FREE SHEAR LAYER
    自由剪切层中旋涡合并的数值模拟
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    A NUMERICAL STUDY ON COUPLED DYNAMIC ANALYSIS OF LIQUID CONTAINERS
    贮箱液固耦合振动分析的数值研究
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    A NUMERICAL METHOD FOR THREE DIMENSIONAL NONLINEAR FINITE ELEMENTS WITH ELASTIC BOUNDARY ELEMENTS
    三维非线性有限元与弹性边界元耦合数值方法
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    A NUMERICAL METHOD OF ANALYSING PLASTIC DYNAMIC RESPONSE OF THIN SHELLS
    分析薄壳塑性动力响应问题的一种数值方法
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  numerical and
    NUMERICAL AND EXPERIMENTAL STUDY OF INCOMPRESSIBLE VISCOUS FLOW THROUGH A PLANE CASCADE AT VARIOUS ANGLES OF ATTACK
    不同攻角下平面叶栅不可压缩实际粘性流动的数值和实验研究
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    The experimental studies were performed within the Mach number range from 2 to 10.7 and Reynolds number based on the model inlet height of Re=(1~5)10 6. The numerical and experimental results are in good agreement.
    进行实验研究的马赫数M=2~ 1 0 7,基于模型进气道高度的雷诺数Re=( 1~ 5) × 1 0 6。 数值计算与实验结果一致性很好。
短句来源
    NUMERICAL AND EXPERIMENTAL PROGRESSES OF THE RESEARCH ON THE JETS IN CROSSFLOW
    横向紊动射流的数值与实验研究进展
短句来源
    Numerical and experimental study of base jet interaction in hypersonic external flow
    三维高超声速底部喷流干扰流场数值模拟与试验研究
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    Numerical and Experimental Investigation to Gas-Liquid Transient Pipeline Flow
    气液两相管流水力瞬变的数值计算及实验研究
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      numerical
    The essential dimension is a numerical invariant of the group; it is often equal to the minimal number of independent parameters required to describe all algebraic objects of a certain type.
          
    We do this in a setting that closely resembles the numerical analysis setting of Mallat and Zhong and that seems to capture something of the essence of their (practical) reconstruction method.
          
    We do this in a setting that closely resembles the numerical analysis setting of Mallat and Zhong and that seems to capture something of the essence of their (practical) reconstruction method.
          
    Mathematical details and numerical examples are included.
          
    Then, we describe a numerical method to compute the dual function and give an estimate of the error.
          
    更多          
      numerically
    It is well known that Gabor expansions generated by a lattice of Nyquist density are numerically unstable, in the sense that they do not constitute frame decompositions.
          
    Spherical harmonic series have many of the same wonderful properties as Fourier series, but have lacked one important thing: a numerically stable fast transform analogous to the Fast Fourier Transform (FFT).
          
    Finally, we consider the spline of order 2; we investigate numerically the region of the time-frequency plane where it generates a frame and we compute the dual function for some values of the parameters.
          
    This makes them numerically attractive for applications in geophysical modeling.
          
    It is simple in structure, implementable, numerically efficient and has global convergence.
          
    更多          
      a numerical
    The essential dimension is a numerical invariant of the group; it is often equal to the minimal number of independent parameters required to describe all algebraic objects of a certain type.
          
    Then, we describe a numerical method to compute the dual function and give an estimate of the error.
          
    The popularity of PSWFs seems likely to increase in the near future, as band-limited functions become a numerical (as well as an analytical) tool.
          
    A numerical example illustrates that the method is available.
          
    A numerical example is given to illustrate the solution procedure.
          
    更多          
      numerical and
    Numerical and empirical results are presented establishing the empirical stability of the basic algorithm.
          
    Both numerical and compositional variations were monitored for a long-term (more than 1.5 years) utilization process in an association of microorganisms decomposing organic pollutants.
          
    On automodel numerical and asymptotic solutions of boundary-layer equations for high rates of injection
          
    Near the flow axis the numerical and analytic solutions are fairly close, but at a distance from the axis the assumptions made reduce the accuracy of the approximate solutions.
          
    Numerical and approximate (by the method of moments) solutions of the kinetic equation are obtained.
          
    更多          


    In dealing with the problem of sand particles moving relative to the surrounding water, Stokes' formula of resistance has usually been used to render the velocity of sedimentation of the particles. But such an approach has not been proved rigorously, and its accuracy must be carefully examined. In the previous paper, we gave the resistance acting on a sphere moving in a non-uniform flow field. In this paper, we assume the concentration of sand particles to be very small, and using the previously obtained formula...

    In dealing with the problem of sand particles moving relative to the surrounding water, Stokes' formula of resistance has usually been used to render the velocity of sedimentation of the particles. But such an approach has not been proved rigorously, and its accuracy must be carefully examined. In the previous paper, we gave the resistance acting on a sphere moving in a non-uniform flow field. In this paper, we assume the concentration of sand particles to be very small, and using the previously obtained formula for the resistance, we establish the general equations of motion of laminar flow of sand particles and water. Then, we discuss the sedimentation motion of sand particles for laminar flow in an open channel.Finally, we find that the component of relative velocity parallel to the main stream is not equal to zero. Thereby, we obtain the error in the position of sedimentation as calculated by means of the usual simplified assumption. This error in position is proportional to the depth of water, and is independent of the size of sand particles. In general, it is not a negligible quantity.

    在前文中我们已经给出小球在不均匀流场中运动时所受到的阻力。本文中我们假定泥沙和水为两种不同的介质,同时假定泥沙的浓度很小。利用前文所得到的阻力公式,我们建立了在层流状态时泥沙和水各自的运动方程组。然后利用这一组方程来讨论明渠中水流流态为层流时泥沙沉淀的情况。最后我们得到泥沙和水的相对速度在主流方向的分量并不等于零。同时我们求得根据简单假定来计算时所引起的沉积位置的误差。这个误差和水深成正比而和泥沙颗粒的大小无关。一般说来,这个误差并不是一个可以忽略的数值

    It is pointed out that the settlement due to deviatoric stresses is incorrectly disregarded in conventional methods of calculation. It is shown that the deviatoric tensor of stress can not be neglected, whereas the time dependent response of the soil skeleton to deviatoric stresses should be taken into account. On the base of his theory on the consolidation and flow of clay-layers "the author presents an analysis on several two dimensional problems. It is shown that the total settlement may bo considored as...

    It is pointed out that the settlement due to deviatoric stresses is incorrectly disregarded in conventional methods of calculation. It is shown that the deviatoric tensor of stress can not be neglected, whereas the time dependent response of the soil skeleton to deviatoric stresses should be taken into account. On the base of his theory on the consolidation and flow of clay-layers "the author presents an analysis on several two dimensional problems. It is shown that the total settlement may bo considored as consisting of three main compouents, viz. instantaneouss settlement, and settlements due to flow and due to consolidation. Settlement formulas are presented for large values of time. It is concluded that settlements in practice can not be predicted merely from oedometer tests. The consolidation in two dimensional problems turns out to behave quite differently from that of the classical one-dimensional case, as the soil can always deform laterally. The deviatoric stresses are responsible for the instantaneous deflection and the continuous flow of the clay mass.

    本文指出現行的沉陷計算方法不考虑因均差应力(Deviatorie stresses)而产生的沉陷是不正确的。文中証明了均差应力張量不能忽略,而土壤的結構对均差应力的反应(与时間因素有关)则必須考虑。作者根据他自己的关于粘土層固結与流变的理論,提供几个二維問題的分析,証明了总沉陷可以分为三部分,卽瞬时下沉,因流变而产生的和因固結而产生的沉陷,并且提出了时間为很大数值时的沉陷公式。可以断言,在实际中,沉陷不能單从压縮試验来估計。在二維問題中,土壤的固结与古典的一維固結情形迥然不同,因为土壤总是有横向膨脹的。均差应力就是粘土在荷載下瞬时下沉(Instantaneous deflection)和不断流变的原因。

    A method which enables us to calculate the directions of principal stresses directly from the functions is shown. A procedure which enables us to calculate the solution of plane elasticity problem based only on photoelaslic isochromatic pattern is established. The procedure is explained in the following diagram:The methods used to find the results in steps I, II, ②, ④ to ⑤ are well known. In this paper it is shown how step ③ is carried out by numerically solving partial differential equations (8), (9):

    假设弹性力学平面问题中的主应力差函数q(x,y)已由应力光图试验确定。以此为基本数据,根据给定的载荷及边界条件,利用数值解法道接求出主应力之和及主应力方向,再求出σ_1,σ_2,θ,这是Fppl方法的一种改进。由于这方法是以准确度高的实验数据q(x,y)为出发点来求问题的完全解,所以数值计算的误差可以减小。

     
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