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数值微分法
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  numerical differentiation
     The results obtained from three different methods—the conventional numerical differentiation, the discrete wavelet transform method and the proposed continuous wavelet transform method were compared, it was demonstrated that the results are similar for signals without noise, but the signal to noise ratio (SNR) of the result obtained by the CWT method is improved greatly comparing with the former two methods for noisy signals.
     通过数值微分法、离散小波变换法及连续小波变换法对模拟信号的求导结果表明 :对于无噪音的信号 ,三种方法的结果相似 ,而对于含有噪音的信号 ,连续小波变换法所得结果的信噪比明显高于前两种方法。
短句来源
     Determination of the Rate Constant of the First Order Reaction by Numerical Differentiation
     数值微分法确定一级反应速率常数
短句来源
     In this paper,observation equations are constructed according to the numerical differentiation based on Newton's law of motion and the energy conservation respectively. The gravitational potential coefficients are recovered until degree 50 based on simulated CHAMP ephemerides.
     根据模拟的CHAMP卫星星历,分别采用基于牛顿运动定律的数值微分法和基于能量守恒定律的能量守恒法建立观测方程,恢复出50阶次的重力位系数。
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     This paper details a deriving Way for the general-shape formula of Linear multistep method, by means of Taylor unfolding, Uncertain-coeff icient method, Numerical integration, Numerical differentiation.
     本文利用Taylor展开、待定系数法、数值积分和数值微分法来讨论线性多步法一般形式公式的构造方法。
短句来源
     Determination of Curvature Radius of Cam Profiles Using Numerical Differentiation
     确定凸轮廓线曲率半径的数值微分法
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  numerical differential method
     2)Three methods for gravity field recovery are mainly studied from the views of observation equation, (1) numerical differential method, (2) energy balance approach, (3) numerical integration method.
     2)从建立观测方程的角度来说,主要研究了三种恢复地球重力场的方法:(1)数值微分法,(2)能量守恒法,(3)数值积分法。
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     A Numerical Differential Method for Solving the Parameters in Soil Kinetic Study with Displacement Technique
     一种求算土壤流动法中动力学参数的数值微分法
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     4 ) Numerical differential method and energy balance approach are applied respectively to recover the geopotential coefficients until 50 degree based on the simulated observation datum of CHAMP.
     4)基于模拟的CHAMP 卫星观测数据,分别用数值微分法和能量守恒法恢复50阶次的重力位系数。
短句来源
     A suit of method is established to get the competitive sorption kinetics parameters: The sorption velocities are calculated by numerical differential method, then the sorption kinetic parameters are calculated using the n-direction extremum complex type optimizing method (the parameters include saturated sorption amount Xm, equilibrium sorption amount Xe, sorption velocity constant ka, desorption velocity constant kd etc.) , the results are validated by numerical solution method.
     针对该模型建立了一套求算竞争吸附动力学参数的方法:用数值微分法求算吸附速率,用n维极值复形调优法求算动力学参数饱和吸附量Xm,平衡吸附量Xe,吸附速率常数ka,解吸速率常数kd等,并用数值解法进行参数验证。
  “数值微分法”译为未确定词的双语例句
     The feasibility and stability of the regression of the chemical kineticexperimental differential equation with methods of numerical differenti-ation and numerical integeration are examined.
     考查了数值微分法和数值积分法回归化学动力学微分方程的可行性和方法的稳定性,证实数值积分法在实验数据准确到第四位有效数字时,可以得到满意的结果.
短句来源
     By use of the result, the calculating precision of numeric differential method and empirical formula is analyzed.
     利用所得到的结果 ,分析了数值微分法和经验公式的计算精度。
短句来源
     This paper makes use of numerical differential in Nakai method for tidal data, and Selects the post of interpolation proper, the quantity and time of computation are reduced, so the Nakai computation can be used on PC-1500 portable computer very easy. It makes a covenience for using the Nakai method.
     本文在潮汐资料的Nakai处理方法计算中使用了数值微分法中的插值微分公式,加上插值点的恰当选取,使计算量及计算时间大幅度的减少,并使Nakai法能在PC-1500机上进行,为Nakai法的广泛应用提供了方便。
短句来源
     APPLICATION OF NUMERICAL DIFFERENTIAL IN NAKAI PROCESS OF TIDAL DATA
     数值微分法在潮汐资料的Nakai处理方法中的应用
短句来源
     Digital Differential Analyzer, Midpoint Analyzer and Bresenham are three algorithms don't discuss the state that the slope's absolute value is above one.
     数值微分法、中点法、Bresenham算法是直线扫描算法中的三个常用算法,这三个算法均未讨论斜率大于1的情形.
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  numerical differentiation
First and second order numerical differentiation with Tikhonov regularization
      
This work deals with the numerical differentiation for an unknown smooth function whose data on a given set are available.
      
The numerical differentiation is an ill-posed problem.
      
The velocity field is determined by numerical differentiation, which reduces the computation accuracy significantly.
      
Eliminating numerical differentiation from the calculation permits an increase in accuracy of the results obtained.
      
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  numerical differentiation methods
The feasibility of applying numerical differentiation methods to tables of thermodynamic functions is demonstrated on several numerical examples.
      
However, usual techniques for computing the derivatives, for example numerical differentiation methods, are hard to apply to real scale structures because of the large amount of computational time and the accumulation of computational errors.
      
Calculation of the potential constants of diatomic molecules by numerical differentiation methods
      


The feasibility and stability of the regression of the chemical kineticexperimental differential equation with methods of numerical differenti-ation and numerical integeration are examined.When the experimentalvalues are exact in the fourth significant figures,the calculation resultsare satisfactory with the method of numerical integeration.The BASICProgram CHKI for the regression of the chemical kinetic differential eq-uation is written by authors,in which the Taylor ro Marquardt leastsduare method of regression...

The feasibility and stability of the regression of the chemical kineticexperimental differential equation with methods of numerical differenti-ation and numerical integeration are examined.When the experimentalvalues are exact in the fourth significant figures,the calculation resultsare satisfactory with the method of numerical integeration.The BASICProgram CHKI for the regression of the chemical kinetic differential eq-uation is written by authors,in which the Taylor ro Marquardt leastsduare method of regression curve,the interpolation with three termsspline function and Simpsn numerical integeration are used.The optionrange of the parameters original values is wide and the convergencespeed is fast with Program CHKI.

考查了数值微分法和数值积分法回归化学动力学微分方程的可行性和方法的稳定性,证实数值积分法在实验数据准确到第四位有效数字时,可以得到满意的结果.编制了积分法回归动力学微分方程的 BASIC 程序 CHKI,程序采用实验值的三次样条函数插值法,最小二乘曲线拟合的 Tay-lor 级数展开法或 Marquarbt 法,Simpson 成组数值积分法.计算结果表明程序 CHKI 的收敛速度快,待定参数初始值的选择范围宽,取得了满意的效果.

This paper makes use of numerical differential in Nakai method for tidal data, and Selects the post of interpolation proper, the quantity and time of computation are reduced, so the Nakai computation can be used on PC-1500 portable computer very easy. It makes a covenience for using the Nakai method.

本文在潮汐资料的Nakai处理方法计算中使用了数值微分法中的插值微分公式,加上插值点的恰当选取,使计算量及计算时间大幅度的减少,并使Nakai法能在PC-1500机上进行,为Nakai法的广泛应用提供了方便。

There have been some methods, such as numerical differentiation, photographic differentiation and the finite element method, etc, to calculate strains from the u, v fringe patterns that obtained by means bf moire methods and speckle methods. This paper suggests a method which uses boundary element methods to calculate the strains from the prinse patterns. It is a hybrid method. This method has some advantages, sush as simple program, less input data, high accuracy, the consider domain can be selected actively...

There have been some methods, such as numerical differentiation, photographic differentiation and the finite element method, etc, to calculate strains from the u, v fringe patterns that obtained by means bf moire methods and speckle methods. This paper suggests a method which uses boundary element methods to calculate the strains from the prinse patterns. It is a hybrid method. This method has some advantages, sush as simple program, less input data, high accuracy, the consider domain can be selected actively and does not need determine the absolute fringe Order in the patterns.

用云纹法、散斑法等实验方法获得平面问题位移场,即u、v条纹图后,求应变(或应力)的方法有数值微分法、光学微分法和有限元法等。本文提出用边界元法从位移条纹图计算应变的方法是一种混合法。本法具有输入数据少、计算精度高、计算区域可灵活选择而不受边界影响、不需要确定绝对条纹级数等优点。

 
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