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数值     
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  numerical
    Probabilistic Numerical Method for the Dirichlet
    Dirichlet问题的概率数值方法
短句来源
    The Representation Theory of Matrices and Its Applications in Numerical Calculation
    矩阵的表示理论及其在数值计算中的应用
短句来源
    Applications of Spline Functions and Wavelets on Numerical Solution of PDEs
    样条函数与小波函数在偏微分方程数值解中的应用
短句来源
    Numerical Methods for Some Time Dependent Nonlinear Partial Differential Equations
    若干时间相关、非线性偏微分方程的数值解法
短句来源
    The Numerical Simulation Methods for Non-Linear Stochastic Structure
    非线性结构随机分析数值模拟的方法研究
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  value
    A FAMILY OF NUMERICAL METHODS FOR THE SOLUTION OF INITIAL VALUE PROBLEM OF STIFF DIFFERENTIAL EQUATIONS
    Stiff微分方程初值问题的一类数值方法
短句来源
    A NUMERICAL METHOD FOR THE SOLUTION OF INITIAL VALUE PROBLEM OF STIFF DIFFERENTIAL EQUATIONS
    Stiff微分方程初值问题的一种数值方法
短句来源
    The Numerical Solution of Initial value problems of Stiff Ordinary Differential Equations
    Stiff常微分方程初值问题数值解法
短句来源
    THE NUMERICAL ALGORITHM FOR SOLVING SPECIAL INITIAL VALUE PROBLEM OF ORDINARY DIFFERENTIAL EQUATIONS
    常微分方程特殊初值问题的数值算法
短句来源
    A NUMERICAL METHOD FOR SOLVING A TWO-POINT BOUNDARY VALUE PROBLEM BY DIRECTLY INTEGRATING NONLINEAR ORDINARY DIFFERENTIAL EQUATIONS
    直接积分非线性常微分方程组两点边值问题的一种数值解法
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  numerical value
    THE NUMERICAL VALUE EFFICIENCY OF Mo-ALGORITHM
    Mo-算法的数值效率
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    SOLVE FOR THE NUMERICAL VALUE OF INTEGRAL EQUATION BY THE BOUNDARY ELEMENT METHOD
    用边界元法求积分方程数值
短句来源
    THE SOLUTION TO NUMERICAL VALUE OF DIFFERENTIAL EQUATION IN PARTICLE MOTION CONTAINING FORM FUNCTION
    含表格函数的质点运动微分方程的数值解法
短句来源
    The Solution to the Numerical Value of λ-Matrix Equivalent Standard
    λ-矩阵等价标准形的数值解法
短句来源
    The Solution to the Numerical Value of λ—Matrix Equivalent Standard
    λ-矩阵等价标准形的数值解法
短句来源
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  numerical values
    Research on Way to Rounding off Numerical Values
    对数值修约方法的研究
短句来源
    The boundary type cubature is quite the type of formulae that only use numerical values on the boundary of the domain.
    边界型求积公式正是仅仅利用被积函数在区域边界上的数值构造的公式。
短句来源
    thirdly, with the help of ELES model, the numerical values such as the income and price flexibility of housing consumption, which are hard to figured out in the general computation models, are at last calculated, and thus give out some relevant suggestions to the question of government control.
    利用ELES模型定量计算得出了诸如住房消费的收入弹性和价格弹性等利用一般的计量模型难以计算的数值结果,并针对政府的房地产市场宏观调控提出了相应的政策性建议;
短句来源
    2. the discharge coeffieient is affected by the parametr r/d, and the values r/d may be different from the value specified by Koennecke 3. the manufacturing precision seems to have little effect on the stability and numerical values of the discharge coefficients.
    2.90°噴管的原始流量系数值与r/d有关,r/d的数值可以不受Koennecke建議的限制; 3.加工精度对流量系数的稳定性和流量系数值似无显著影响。
短句来源
    Base on the fundamental contents and chief Characteristics of Systeme International d'Unites (SI) this paper discusses some problems on the application of SI in our country, such as: mass, weight and gravitational force; work, energy, heat and electric energy; mulliples of unit and numerical values;
    在介绍国际单位制(SI)的主要内容和主要特点的基础上,本文提出在我国推广使用SI时应该注意的若干问题:诸如质量、重量与重力问题,功、能量、热量、电能问题,词冠与数值应用问题,把旧单位换算成SI问题.
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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.
      
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  value
Singular Value Estimates for Certain Convolution-Product Operators
      
We present two-sided singular value estimates for a class of convolution-product operators related to time-frequency localization.
      
Singular Value Estimates for Certain Convolution-Product Operators
      
The sampling theorem is a Kramer-type sampling theorem, but unlike Kramer's theorem the sampling points are not necessarily eigenvalues of some boundary value problems.
      
We study boundary value problems for the time-harmonic form of the Maxwell equations, as well as for other related systems of equations, on arbitrary Lipschitz domains in the three-dimensional Euclidean space.
      
更多          
  numerical value
A numerical value of the gas-kinetic coefficient which takes into account the effect of the curvature of the surface on the thermal slip coefficient is obtained.
      
A numerical value for the coefficient of heterogeneous recombination of chlorine atoms on glass was obtained for pure chlorine and chlorine-oxygen plasmas.
      
The stoichiometry (1 : 1) and the numerical value of the rate constant of the reaction of a fullerene with ozone (1.2 × 103 l mol-1 s-1) at 0°C were determined.
      
The NNC is a local topochemical invariant of a vertex of the molecular graph whose numerical value is a function of the total number and the composition of vertices adjacent to the given vertex.
      
The maximal numerical value is defined for the eccentricity at which a stable libration point can still exist.
      
更多          
  numerical values
The basic distinction of this approach lies in that here the numerical values of the reliability parameters (probabilities or intensities of faults or failures) of the computing resources are neither given nor used.
      
Numerical values of the parameters of kinetic equations were calculated by the Monte Carlo method.
      
The numerical values of several physical parameters (the parameters of distribution of solar cosmic ray (SCR) particles inside heliosphere traps, the coefficients of trap transparency) that are not observed by direct measurements are estimated.
      
Numerical values of the period and amplitudes of oscillations of the poles are obtained by estimating the elastic deformation of the Earth and the variation of its inertia tensor, and they agree well with observational data.
      
The article gives numerical values of the coefficient of longitudinal mixing found using the method under consideration.
      
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  其他


Wang's theory for determining the approximate configurational partition function of the adsorbed layer is modified in two different ways. One is to assume that the configurational energy should be corrected: the other to advocate that the deficiency due to a wrong expression for the a priori probability of the. central site is more significant.The configurational partition function is evaluated is both methods and the adsorptipn isotherin and the beat of adsorption computed for the case of quadratic lattice...

Wang's theory for determining the approximate configurational partition function of the adsorbed layer is modified in two different ways. One is to assume that the configurational energy should be corrected: the other to advocate that the deficiency due to a wrong expression for the a priori probability of the. central site is more significant.The configurational partition function is evaluated is both methods and the adsorptipn isotherin and the beat of adsorption computed for the case of quadratic lattice With dipole interaction. values for the last two quantities when a uniform continuous distribution of the distant adsorbed particles is assumed are further given for comparison. The second method, which surpasses the first, is compared with Kirkwood's method. in the case of hexagonal lattice with neighbour interaction. Numerical work is also carried out in this case.

本文就王竹溪先生之理论用两种不同方法加以改良。一种为改变能量公式,另一种为改变中心格点之或然率。用此二法皆可求得近似配分函数。所得关於方格在偶极作用情形下之粘附等温曲线及粘附热之数值用图比较之,并与旧日平均连续分布之理论比较。本文所用之第二法实较第一法为佳,故应用之以讨论一三角格在相邻作用情形下之粘附现象,且应用Kirkwood理论以为比较。数值结果亦有图表之。

The object of this paper is offer an analytical method for solving the very important stereo-bridging problem in photogrammetry. In solving this problem we suppose that at the beginning and at the end of an arbitrary photo-strip there are three ground control points having their immages on the corresponding two pairs of photographs respectively. Based upon this condition we can utilize the stereo-resection method to carry out the aerial triangulation throughout the entire strip in order to get enough space intersection...

The object of this paper is offer an analytical method for solving the very important stereo-bridging problem in photogrammetry. In solving this problem we suppose that at the beginning and at the end of an arbitrary photo-strip there are three ground control points having their immages on the corresponding two pairs of photographs respectively. Based upon this condition we can utilize the stereo-resection method to carry out the aerial triangulation throughout the entire strip in order to get enough space intersection points for each intermediate photograph possibly to be mapped by virtue of some simple instruments.This paper is the extension of a previous article entitled "Photogrammetric Space Resection", published in the Chinese Journal of Civil Engineering, Vol. 1, No. 4, Dec., 1954. At present, as the writer has not get gone so far into numerical computation, how would this method be workable is subject to test in the near future. The prospect of not only furthering the theoretical foundation of photogrammetry but also opening a new approach to the photomapping problem is highly encouraging.

本文的目的,在於提供一种算学解析的方法,从理論上去解决在一条相当長的航帶上只在兩端各有三个地面控制点的情况下,展开空中三角測量,以达到每張像片都有足够的控制点,以便独立或分区制圖的問題,解决本問題的重点是:(1)根据一条航带兩端的三控制点确定該航线首尾兩端各兩張像片的外方位元素。(2)由于在一条航带上的各像片彼此都有60—80%的左右重叠,在第一、第二及第三像片的重叠区域可选出七个点来利用已經定位了的第一、第二兩像片,以空間交会的办法計算出該七点的地面坐标。(3)在該七点中适当选擇6个点的地面坐标及其在第三像片上的像点坐标(根据第三像片的几何軸量得的),确定第三像片的外方位元素。(4)利用第二、第三及第四像片,在其重叠的区域内选擇七个点,按照确定第三像片外方位元素的办法,确定第四像片的外方位元素,如是类推至最后一張像片为止。(5)由于航帶兩端各有三控制点,上面的推算各像片的外方元素的过程实际上是从兩端开始向中央推进,其最中間的一張像片的外方位元素及其中央的交会控制点的坐标,因有各种誤差参入的关系,由兩端推来,当会得到兩組不同的数值,取其中数作为第一次近似值,將其坐标誤差一边一半向兩端按距离分配,作...

本文的目的,在於提供一种算学解析的方法,从理論上去解决在一条相当長的航帶上只在兩端各有三个地面控制点的情况下,展开空中三角測量,以达到每張像片都有足够的控制点,以便独立或分区制圖的問題,解决本問題的重点是:(1)根据一条航带兩端的三控制点确定該航线首尾兩端各兩張像片的外方位元素。(2)由于在一条航带上的各像片彼此都有60—80%的左右重叠,在第一、第二及第三像片的重叠区域可选出七个点来利用已經定位了的第一、第二兩像片,以空間交会的办法計算出該七点的地面坐标。(3)在該七点中适当选擇6个点的地面坐标及其在第三像片上的像点坐标(根据第三像片的几何軸量得的),确定第三像片的外方位元素。(4)利用第二、第三及第四像片,在其重叠的区域内选擇七个点,按照确定第三像片外方位元素的办法,确定第四像片的外方位元素,如是类推至最后一張像片为止。(5)由于航帶兩端各有三控制点,上面的推算各像片的外方元素的过程实际上是从兩端开始向中央推进,其最中間的一張像片的外方位元素及其中央的交会控制点的坐标,因有各种誤差参入的关系,由兩端推来,当会得到兩組不同的数值,取其中数作为第一次近似值,將其坐标誤差一边一半向兩端按距离分配,作为控制点的概略平差。(6)利用概略的像片外方位元素,將各像?

~~

按照限界状态计算是一种新的结构计算方法,该法考虑问题较旧法——按许可应力计算和按破坏阶段计算——更为全面和合理。例如区分了三种限界状态,使得计算更加明确;不采取单一的无所不包的安全系数,而采取三个系数——超载系数工作条件系数和匀质系数。由于采取了超载系数和工作条件系数,可以更准确地考虑到作用于结构物的荷重变化和结构物的工作条件;而匀质系数表示了在目前结构物构件断面计算中所应采取的最小强度值,因此匀质系数考虑到了建筑工艺的实际技术水平。混凝土的匀质系数是某一标号混凝土的可能最小强度值与标准强度的比值,因此它可以因建筑工艺的改进而改变。在其他两个系数保持不变的条件下,匀质系数的提高可以减少结构物构件断面的尺寸,因而也就节省了材料。为了考虑混凝土的匀质性,就必须计算出它的匀质指标。若已知各个不同工地的混凝土的匀质指标,不仅可以综合比较,以改变在规范中规定的数值,并且可以分析匀质指标低的某些工地的情况,以求改进工艺过程,提高产品质量。所以确定匀质系数不仅为过渡到按限界状态计算准备条件,而且本身具有先进的技术经济的意义。本文首先论述了结构物的不同计算方法,比较了各种方法的优缺点,说明匀质系数在新的计算方法中...

按照限界状态计算是一种新的结构计算方法,该法考虑问题较旧法——按许可应力计算和按破坏阶段计算——更为全面和合理。例如区分了三种限界状态,使得计算更加明确;不采取单一的无所不包的安全系数,而采取三个系数——超载系数工作条件系数和匀质系数。由于采取了超载系数和工作条件系数,可以更准确地考虑到作用于结构物的荷重变化和结构物的工作条件;而匀质系数表示了在目前结构物构件断面计算中所应采取的最小强度值,因此匀质系数考虑到了建筑工艺的实际技术水平。混凝土的匀质系数是某一标号混凝土的可能最小强度值与标准强度的比值,因此它可以因建筑工艺的改进而改变。在其他两个系数保持不变的条件下,匀质系数的提高可以减少结构物构件断面的尺寸,因而也就节省了材料。为了考虑混凝土的匀质性,就必须计算出它的匀质指标。若已知各个不同工地的混凝土的匀质指标,不仅可以综合比较,以改变在规范中规定的数值,并且可以分析匀质指标低的某些工地的情况,以求改进工艺过程,提高产品质量。所以确定匀质系数不仅为过渡到按限界状态计算准备条件,而且本身具有先进的技术经济的意义。本文首先论述了结构物的不同计算方法,比较了各种方法的优缺点,说明匀质系数在新的计算方法中的地位和意义;其次叙述了确定匀质系数所根据的或然率理论和数学统计方法;最后分析了在北京搜集到的—些资料,得到在187个110标号的混凝土试件中匀质系数为0.52,在152个140标号的混凝土试件中匀质系数是0.69,根据这些结果提出了一些建议。

 
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