NURBS curve equation has three kinds of the equivalence form, i. e. rational fraction, rational base function and homogeneous coordinate.
NURBS曲线方程具有三种等价形式：有理分式表示、有理基函数表示和齐次坐标表示。
A method for calculation the economic results of the preconcentration using magnetic-pulley separator is recommended and a simple and rational calculation equation is deduced from the method.
本文提出了一种计算磁滑轮预选经济效益的方法，并导出了简单而又合理的计算公式。
Based on the new method, the paper discusses an inverse mapping of rational parameter surface, also, the implicit equation of the parametric equation is obtained.
用该方法对基于有理参数曲面的逆映射进行了一些探讨，并得到参数曲面的隐式方程。
The rational well spacing under certain perforating level and the rational open thickness under certain well density can be determined by this equation.
用此关系式可确定该类油藏给定打开程度下的合理井距及给定井网密度下油井的合理打开厚度。
Global asymptotic stability of a class of nonlinear rational difference equations was studied by means of setting up an auxiliary equation, so that a sufficient condition was obtained.
运用建立辅助方程的方法研究一类非线性有理差分方程正平衡点的全局渐近稳定性，得到一个充分条件。
Numerical example showed that the parametric equation is rational to describe the shape of mooring line.
算例表明，描述锚链线形状的参数方程是合理的。
The paper is regarding a fourth-order rational difference equation, proving that the positive equilibrium point of the equation is globally asymptotically stable.
研究了一个四阶有理差分方程，证明了该方程的正平衡点是全局渐近稳定的。
As showed by the equation, the water level is directly determined by the mining amount. It will provide a scientific basis for improving geological environment and rational use of brine resources.
通过分析说明开采对水位的影响，为改善区内地质环境，合理利用卤水资源提供了科学依据。
The rational macro-element method was given to solve Poisson's equation. Through divided to several zone, the method can solve in any shape 2D zone.
通过将求解域划分为一个或多个宏单元，有理宏单元法可对任意形状的二维区域求解。
The rational macro-element method was given to solve Poisson's equation. Through divided to several zone, the method can solve in any shape 2D zone.
通过将求解域划分为一个或多个宏单元，有理宏单元法可对任意形状的二维区域求解。
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