As walk-off angle and acceptance angle of beam limit the conversion efficiency and the tunable wavelength range of difference frequency generation, research include effective nonlinear coefficient, walk-off angle and acceptance angle as functions of wavelength, the relationship between conversion efficiency and acceptance angle, and the impact of crystals length on the process of frequency conversion.

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In the light of the complex, high-level and non-linear feature of the mathematical model which describe the transport of the coalbed methane, this paper study the fully-implicit solving method of the mathematical model in detail. Based on the complexity of the algebraic equations which are formed eventually, according to the alternating direction implicit difference pattern, this paper use the iterative method and the fully main element Gauss-Jordan eliminating method to solve equations, which is to use the iterative method to determine coefficient matrix and use the fully main element Gauss-Jordan method to solve th linear algebraic equation group, at the same time of studying the solving method of the mathematical model, according to the devising requirement of FORTRAN77 program structure, this paper draw up computer program and form the corresponding computer model, and verify the validity and reliability of the model in theory by operating the model.

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In the fourth chapter, we build the model of coefficient on one dimension partial differential equation and adopt finite element method to discrete partial differential equation and in the fifth chapter, we employ GP to identify and build the model of right-side function and adopt over-relaxation or alternating direction implicit method to solute difference equation.

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A new color difference formula in RGB color space is achieved by dynamically adjusting the vector distance and angular between a pair of RGB colors.The dynamic coefficient is weighted by the importance of color component.

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From the view of"fairness"as the axis of abscissas, income distribution situated extremely fairness condition till'78 in China. On starting reform, Gini coefficient started to rise too. The difference between areas and between classes has become to be larger.

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This paper gives an accurate inversion of matrix of coefficient which is derived fromsolving the boundary-value problem of biharmonic equation in rectangular region by meansof difference method.

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Plain scanning of intestinal wall was performed. CT values, contrast coefficient of enteric cavity and intestinal wall density, and difference in enteric cavity and intestinal wall density were measured 20 s, 30 s, 40 s, and 50 s after enhancement scanning.

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The distributed parameter model is changed into variable coefficient nonlinear stiff ordinary differential equations by central difference method.

運用中心差分法將分布參數(shù)形式的系統(tǒng)模型轉換為一變系數(shù)非線性的剛性常微分方程組。

The paper also unveils the essential difference existing in the parallel conceptions of different coefficient domain.

構造、匯集了復變函數(shù)中的部分反例人人艹97，揭示了不同數(shù)域內平行概念間的本質差異亚洲观看一区二区三区。

In the second part, we make the study of the application of Z-transformation when we solve linear difference equation bearing constant coefficient and transmission function in pulsing system.

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