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neighborhood
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  邻域
    We develop a adaptive evolutionary algorithm based on neighborhood searching. Firstly, class the individuals by the fitness number to realize the division of population.
    本文设计了一种基于邻域搜索的自适应演化算法:首先将种群中的个体按适应值分级,实现对种群中的优势个体与劣势个体的分割。
短句来源
    In this paper, a nonlocal theory of fracture for brittle materials has beenproposed. It contains the nonlocal elastic stress fields of mode-I, II, III Griffith cracks, the asymptotic forms of the stress fields at the neighborhood of the crack tips, and the maximum tensile stress criterion of brittle fracture.
    本文提出一种脆性材料断裂的非局部力学理论,内容包括:Ⅰ、Ⅱ、Ⅲ型Griffith裂纹的非局部弹性应力场,裂纹尖端邻域非局部弹性应力场的渐近形式,脆性开裂的最大拉应力准则。
短句来源
    Major results of recent researches on the numerical simulation of wave motion generated by a wave source (or a scatterer) in its neighborhood are reviewed with emphasis on the progress in studies on the artificial boundary condition——the key problem in the numerical simulation.
    本文评述了近年来波源(或散射体)及其邻域内波动数值模拟的主要研究结果,着重讨论了人工边界条件这一关键问题的研究进展
短句来源
    A time_varying feedback control law is established on the base of local linearization. The Liapunov direct method is applied to estimate the neighborhood in which the control law can be effectively used. Numerical examples are presented to demonstrate the applications of the control law to solve the problem of stabilizing unstable periodic orbits and the problem of tracking an arbitrarily given periodic orbit.
    研究一类超混沌离散系统的控制问题· 基于局部线性化建立了时变线性反馈控制律· 采用Liapunov直接法估计了控制律可以有效作用的邻域范围· 分别给出了应用该控制律解决不稳定周期轨道的镇定问题和任意给定周期轨道的追踪问题的算例·
短句来源
    The fourth-order explicit upwind-biased compact difference schemes are used to overcome the difficulty of not adapting to boundary neighborhood for the general fourth-order central difference schemes.
    并采用四阶紧致迎风差分格式,避免了一般四阶中心差分格式不适用于边界邻域的困难和提高了分辨率;
短句来源
  “neighborhood”译为未确定词的双语例句
    Dynamic thermal stress distribution in the neighborhood of a cavity in an unsteady temperature field
    非稳态温度场中孔附近的动热应力集中(英文)
短句来源
    Our country is a nation with high activity and high-frequency of earthquakes. Moreover almost all of oil fields located in the seismic zone and neighborhood.
    我国属多地震国家,而油田大多处在地震活动带,而目前我国又进入一个新的地震高峰期。
短句来源
    An analysis of the relative importance of the coefficients shows that the rotation effect cannot be neglected near the pore opening or near the Wall, and that the lateral force effect must be taken into account in the neighborhood of the edge of the pore opening.
    分析不同系数的相对重要性表明,在孔口和孔壁附近不能忽略旋转效应. 在靠近孔口边缘的局部区域必须计及侧向力效应.
短句来源
    Let the ratio of the lengths of the sides of the cross-section be 1:26. By using Poin-care-Keller's shooting method and introducing rescaling functions, we investigate the case in which 6 is in a neighborhood of δ0= 1. The secondary bifurcations of the equilibrium state of the bar are found whenδ≠1; we also give the asymptotic unfoldings of the primary branchesand secondary branches, and make analysis on the stability of each branch.
    设横截面的边长比为 1:2δ,使用 Poincare-Keller 的打靶法并引进坐标的伸缩变换,研究了δ在 δ_0=1 附近的情形。
短句来源
    On the basis of comprehensive tests for fatigue crack growth rate and photoelastic study of CT specimen made of polycarbonate,it is found that residual stress field is formed and intensified in the neighborhood of crack tip along with the growth of fatigue crack.
    通过聚碳酸酯紧凑拉伸试件的疲劳裂纹扩展速率试验和同时进行的光弹性实验,作者发现随着疲劳裂纹的扩展在裂纹尖端附近产生逐渐加强和扩大的残余应力场,揭示出了裂纹尖端附近的闭合效应的存在,它将使应力强度因子降低.
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  neighborhood
Like the truncations of the Taylor expansion, the truncations of a chromatic expansion at t = t0 of an analytic function f(t) approximate f(t) locally, in a neighborhood of t0.
      
It is available for the case that the sign of f(x) changes frequently or the derivative f'(x) does not exist in the neighborhood of the root, while the Newton method is hard to work.
      
One allows the appearance of eight limit cycles in the neighborhood of infinity, which is the first example that a polynomial differential system bifurcates eight limit cycles at infinity.
      
Neighborhood union of independent sets and hamiltonicity of claw-free graphs
      
Let G be a graph, for any u∈V(G), let N(u) denote the neighborhood of u and d(u)=|N(u)| be the degree of u.
      
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For any study of a suspension entering a pore, the knowledge of the force and moment exerted on a solute particle in an arbitrary position outside the pore is essential. This paper for the first time presents approximate analytical expressions (in closed form) of all the twelve force and moment coefficients for a sphere outside a circular orifice, on the basis of a number of discrete data computed by Yan et at. (1987). These coefficients are then applied to calculate the trajectory and angular velocity of a...

For any study of a suspension entering a pore, the knowledge of the force and moment exerted on a solute particle in an arbitrary position outside the pore is essential. This paper for the first time presents approximate analytical expressions (in closed form) of all the twelve force and moment coefficients for a sphere outside a circular orifice, on the basis of a number of discrete data computed by Yan et at. (1987). These coefficients are then applied to calculate the trajectory and angular velocity of a spherical particle approaching the pore at zero Reynolds number. The trajectory is in excellent agreement with the available experimental results. An analysis of the relative importance of the coefficients shows that the rotation effect cannot be neglected near the pore opening or near the Wall, and that the lateral force effect must be taken into account in the neighborhood of the edge of the pore opening.. It is due to neglecting these factors that previous theoretical results deviate from the experimental ones near the pore opening. The effects of the ratio of the particle to pore radii as well as the influences of the gravity/buoyance on the particle trajectory, velocity distribution and rotation are discussed in detail. It is pointed out that in the experiments of neutrally-buoyant suspensions, the restriction on the density of the particle is most demanding for a large particle size. The expressions of forces and moments presented herein are complete, relatively accurate and convenient, thus providing a good prerequisite for further studies of any problems involving the entrance of particles to a pore.

在研究悬浮液入孔问题时,粒子在孔外任意位置所受的力和力矩是所需的最基本数据.本文在严宗毅等(1987)算出的有限个离散数据的基础上.首次给出了球在圆孔外的全部十二个力和力矩系数的近似解析表达式.我们应用这些系数计算零雷诺数下球形粒子入孔时的轨道和旋转角速度,结果与现有实验数据完全一致.分析不同系数的相对重要性表明,在孔口和孔壁附近不能忽略旋转效应.在靠近孔口边缘的局部区域必须计及侧向力效应.以往的理论结果在孔口附近与实验不符,正是由于忽略了这些因素.本文还详细讨论了粒子和孔口尺寸的相对大小以及重力和浮力对于粒子运动轨道、速度分布和旋转的影响,指出用大粒子做中性悬浮实验时,对其密度的要求特别严格。本文所提供的力和力矩系数,考虑因素全面、比较准确,便于计算,为进一步研究各种涉及粒子入口的问题提供了良好的前提.

Based on the equilibrium equation of an elastic curved bar in [1] , the post-buckling behavior of a slender bar with rectangular cross-section under axial compression is studied. Let the ratio of the lengths of the sides of the cross-section be 1:26. By using Poin-care-Keller's shooting method and introducing rescaling functions, we investigate the case in which 6 is in a neighborhood of δ0= 1. The secondary bifurcations of the equilibrium state of the bar are found whenδ≠1; we also give the asymptotic...

Based on the equilibrium equation of an elastic curved bar in [1] , the post-buckling behavior of a slender bar with rectangular cross-section under axial compression is studied. Let the ratio of the lengths of the sides of the cross-section be 1:26. By using Poin-care-Keller's shooting method and introducing rescaling functions, we investigate the case in which 6 is in a neighborhood of δ0= 1. The secondary bifurcations of the equilibrium state of the bar are found whenδ≠1; we also give the asymptotic unfoldings of the primary branchesand secondary branches, and make analysis on the stability of each branch.Based on the equilibrium equation of an elastic curved bar in [1] , the post-buckling behavior of a slender bar with rectangular cross-section under axial compression is studied. Let the ratio of the lengths of the sides of the cross-section be 1:26. By using Poin-care-Keller's shooting method and introducing rescaling functions, we investigate the case in which 6 is in a neighborhood of δ0= 1. The secondary bifurcations of the equilibrium state of the bar are found whenδ≠1; we also give the asymptotic unfoldings of the primary branchesand secondary branches, and make analysis on the stability of each branch.

基于[1]的弹性曲杆的平衡方程,本文研究了矩形横截面细长杆在轴压下的后屈曲行为。设横截面的边长比为 1:2δ,使用 Poincare-Keller 的打靶法并引进坐标的伸缩变换,研究了δ在 δ_0=1 附近的情形。当δ≠1 时,发现了杆平衡态的二次分叉。我们也给出了原始后屈曲解支及二次分支的渐近表示并分析了各个解支的稳定性。

On the basis of comprehensive tests for fatigue crack growth rate and photoelastic study of CT specimen made of polycarbonate,it is found that residual stress field is formed and intensified in the neighborhood of crack tip along with the growth of fatigue crack. Thus the existence of close effect in the neighborhood of crack tip is revealed.This kind of residual stress and close effect will reduce the stress intensity factor.Therefore the theoretical value △K in the course of fatigue crack growth...

On the basis of comprehensive tests for fatigue crack growth rate and photoelastic study of CT specimen made of polycarbonate,it is found that residual stress field is formed and intensified in the neighborhood of crack tip along with the growth of fatigue crack. Thus the existence of close effect in the neighborhood of crack tip is revealed.This kind of residual stress and close effect will reduce the stress intensity factor.Therefore the theoretical value △K in the course of fatigue crack growth should be modified,and a simple and practical revised scheme is proposed.

通过聚碳酸酯紧凑拉伸试件的疲劳裂纹扩展速率试验和同时进行的光弹性实验,作者发现随着疲劳裂纹的扩展在裂纹尖端附近产生逐渐加强和扩大的残余应力场,揭示出了裂纹尖端附近的闭合效应的存在,它将使应力强度因子降低.因此,疲劳裂纹扩展过程中应力强度因子幅度△K 的理论值应该修正。本文提出了一种简便有效的修正方案.

 
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