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隐式函数
相关语句
  implicit function
     A modified SVM model was proposed and implicit function relationship between nodal pressures and pump station flow, pump station head was established based on modified SVM model.
     本文提出了一种改进SVM算法,并基于该算法建立了测压点压力和泵站流量、水头之间的隐式函数关系。
短句来源
     In hydraulic engineering there are many uncertain things. The limit state functionis the highly nonlinear implicit function of the basic design variable, especially for thecomplex large-scale structures in structural reliability analysis and structure analysis isalso an intricacy.
     水工结构工程设计中存在着大量的不确定性,对于大型复杂结构的可靠度分析,极限状态函数一般都是随机变量的高度非线性的隐式函数,而且结构分析本身就是一个非常复杂的过程。
短句来源
     With the implicit function relation, BP(Back Propagation) neural network can easily realize the mapping between input data and output data.
     通过找出其隐式函数关系,误差反向传播神经网络可以实现输入和输出间的任意映射.
短句来源
     The process variables,which are the implicit functions of the basic input variables,were generally in terms of the comprehensive variables. In order to obtain the final sensitivities of the failure probability to the distribution parameters of the basic variables,the rule of the implicit function derivative was used.
     由隐函数求导法则,推导了失效概率对原始基本变量分布参数的敏度与中间变量分布参数对原始基本变量之间的隐式函数关系。
短句来源
  “隐式函数”译为未确定词的双语例句
     Research on the Rendering Algorithm of Complex Implicit Curve
     复杂的隐式函数曲线绘制算法的研究
短句来源
     Based on the assumption that the bottom water reservoir has two kinds of percolation model, which is horizontal radial flow in the upper part of perforation interval, and hemispherical cen-tripetal flow in the lower part, this paper deduces the implicit func tion of water eoning height at any radius away from borehole axis at any time before water breakthrough in the oil well, and then the botlom water breakthrough time and the profile seetions of water co-ning at different time can be determined.
     基于底水油藏具有两种渗流模型的假设,即射孔段上部为水平径向流动,射孔段下部为半球状向心流动,推导出油井见水前离井轴任一半径在任一时刻的水锥高度的隐式函数,由此可确定底水的突破时间和不同时刻水锥的剖面形态。
短句来源
     A new method for closed curve construction is introduced which is based on the combination of BP neural network and principle of implicit curve construction.
     通过把 BP神经网络与隐式曲线构造原理相结合 ,提出了一种构造隐式曲线的新方法 ,即首先由约束点构造神经网络的输入与输出 ,把描述物体边界曲线的隐式函数转化为显式函数 ;
短句来源
     Based on the fact that the performance functions in reliability analysis of geotechnical engineering are usually implicit or higher order nonlinear in terms of basic random variables,a new Monte-Carlo stochastic finite element method using radial basis function neural network was put forward to deal with reliability problems in geotechnical engineering.
     针对岩土工程可靠性分析的功能函数是隐式函数或高次非线性函数的特点,提出并从理论上论证隐式功能函数和高次非线性功能函数可靠性问题的新解法,即基于径向基网络的蒙特卡罗随机有限元方法;
短句来源
     Examples indicate that the method is available and exact for implicit expressed performance function,and it is a new and effective way for structure reliability analysis.
     实例数值结果表明,基于神经网络将隐式函数转化为明确表达的极限状态方程是可行的,同时该方法具有较高的精度,为结构可靠度计算提供了新的有效思路和手段。
短句来源
  相似匹配句对
     (Q~2)is investigated by using the formalizm of Callan-Syman-zicβ(?)
     (Q~2)的普通的函数表迟:(?)
短句来源
     Implicit Surfaces Based on Radial Basis Function Network
     径向基函数网络的曲面方法
短句来源
     Research on the Rendering Algorithm of Complex Implicit Curve
     复杂的函数曲线绘制算法的研究
短句来源
     Implicit Curve Based on Radial Basis Function Network
     基于径向基函数网络的曲线
短句来源
     Representation for Polygons with Implicit Function
     多边形的函数表示法
短句来源
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  implicit function
The proofs rely on the Nash-Moser implicit function theory and variational methods.
      
In the quasistationary approximation, an analytical solution of the problem representable in the form of an implicit function is obtained.
      
Relation between an implicit function and solutions of a singularly perturbed equation
      
Implicit function theorem for cosymmetric equations
      
Converse implicit function theorem for dynamical systems with cosymmetry
      
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Reusing iterative information ,an approximate inverse function is constructed byinverse interpolation. The approximation approaches to original implicit function are more closethan approximate functions using information at single point.Authors can immediately getexplicit approximate solution instead of solving the approximation of the original function.Thereby,a new method is obtained in finding roots of one variable’s equation and looking foroptimum solutions of one dimensional search.It has higher accuracy...

Reusing iterative information ,an approximate inverse function is constructed byinverse interpolation. The approximation approaches to original implicit function are more closethan approximate functions using information at single point.Authors can immediately getexplicit approximate solution instead of solving the approximation of the original function.Thereby,a new method is obtained in finding roots of one variable’s equation and looking foroptimum solutions of one dimensional search.It has higher accuracy approaching to originalfunction , accelerating calculation and simple iterative pattern. Because the method,named astangential method at two points,synthesizes tangential method and secant method, it can getsatisfactory computational results of accelerating and stable convergence.

重复使用迭代信息反插值构造逆函数的近似,一方面较只使用单点信息能更好地逼近隐式函数,另一方面直接得到显式近似解.于是,得到了逼近精度高、计算速度快、表达简单的迭代格式.这就是在一元方程的求根和一维搜索中综合了切线法和割线法的新方法,并且获得收敛快而稳的满意结果;称为两点切线法.

This paper presents a new method of tracking algorithm for drawing implicitly defined curves. Which produces the next best approximating pixel by looking for a sign difference in function evaluations at midpoints between the eight nearest neighboring pixels, then drawing the whole curve. This algorithm has a large adaptability of both algebraic and transcendental curves and solving the root of the function are not needed. The curves drawed by this method has the property of high precision.

提出轨迹跟踪算法解决隐式函数 f(x,y)=0的平面曲线绘制方法,运用中点函数值符号相异法在当前像素点的邻近8个像素点中选出一点以确定下一最佳像素点的位置,从而描绘出整条曲线。本算法通用性强,不须求解方程的根就可绘制各种代数函数及超越函数曲线;而且所绘制的曲线精确度高。

Based on the assumption that the bottom water reservoir has two kinds of percolation model, which is horizontal radial flow in the upper part of perforation interval, and hemispherical cen-tripetal flow in the lower part, this paper deduces the implicit func tion of water eoning height at any radius away from borehole axis at any time before water breakthrough in the oil well, and then the botlom water breakthrough time and the profile seetions of water co-ning at different time can be determined. Then the paper...

Based on the assumption that the bottom water reservoir has two kinds of percolation model, which is horizontal radial flow in the upper part of perforation interval, and hemispherical cen-tripetal flow in the lower part, this paper deduces the implicit func tion of water eoning height at any radius away from borehole axis at any time before water breakthrough in the oil well, and then the botlom water breakthrough time and the profile seetions of water co-ning at different time can be determined. Then the paper discusses the relationship between oil production in water-free period and well spaeing and peroration degree, and it gets the mathematics eeonom-ics of optimum peroration degree. Case analysis and ealeulation of Xinanzhuang oilfield and other published documents show that all prediction errors of water breakthrough time are lowered than 5% , which indicates that the proposed percolation models and their solu-tions are reliable and accurate, and can be served as reference in the producing and the designing of other bottom water reservoirs.

基于底水油藏具有两种渗流模型的假设,即射孔段上部为水平径向流动,射孔段下部为半球状向心流动,推导出油井见水前离井轴任一半径在任一时刻的水锥高度的隐式函数,由此可确定底水的突破时间和不同时刻水锥的剖面形态。在此基础上讨论了无水生产期的产油量与井距和射孔程度的关系,并求得了最佳射孔程度的数学表达式。通过对溪南庄油田及公开发表文献的实例分析计算,其见水时间预测误差均小于5%,说明提出的渗流模型及其解精确可靠,对底水油藏的开发和设计具有一定的参考和指导意义。

 
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