The discrete curvature vector based method to fair mesh by modifying vertex positions We first low-pass filter the discrete curvature vector function to make it change more gradually and uniformly, and then modify the vertex positions according the resulted function to improve the fairness of mesh.

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The motion of a discrete curve in Minkowski space is first introduced. Then by identifying the spin vector of HF models with the unit vectors of discrete curve, respectively, we obtain the corresponding DNLS.

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Firstly expound the structure of the OFDM system, then analysis the working principle of OFDM communication and research into the key technologies in OFDM system: string conversion, sub-carrier modulation and demodulation, inverse Discrete Fourier Transformation, Discrete Fourier Transformation, cyclic prefix Insert, etc.

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In discrete operator difference method, the displacements of the elements can be reproduced exactly in the discrete forms whether the displacements are conforming or not.

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The concept of topology optimization of truss structures with discrete variables including two kinds of variables and the relative difference quotient algorithm for discrete optimization are extended to the topology optimization of plate and shell structures composed by plate and shell elements.

將包含兩類變量的桁架結(jié)構(gòu)拓?fù)鋬?yōu)化設(shè)計(jì)的概念及求解離散優(yōu)化的相對(duì)差商法進(jìn)一步推廣到由板殼單元組成的板殼結(jié)構(gòu)的拓?fù)鋬?yōu)化毛片aaa一级，建立了包含兩類變量的板殼結(jié)構(gòu)拓?fù)鋬?yōu)化設(shè)計(jì)模型，并采用相對(duì)差商算法進(jìn)行求解淫荡视频网址。

The derivation course and the discrete scheme of the first model-Perona-Malik model have been expatiated on emphasis. One item of the P-M model is omitted in the P-M's discrete scheme, and the gradient magnitude is replaced by the absolute value of difference quotient.

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The main objective of this dissertation was to develop methodologies with capability of engineering application for simulating flow in fractured rock using discontinuum models. The study work includes three parts. In the first part, numerical methodology of three-dimensional discrete fracture network model casing on hybrid BEM-channel was presented, and the technique for improve the model's computing efficiency was also studied. Firstly in this part, computer simulation methodology based on the Baechermodel for generating network of discrete fractures was presented, which includes the follow details: probability distributions of fracture density,orientation, trace length, size, and aperture and estimation of their statistical parameters; stochastic models of fracture network; Monte-Carlo's simulation method; numerical simulation procedure and technicality.

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Study on design of the discrete state PI regulator and observers We extend the results of continuous system to discrete system in order to realize the state PI regulator by using computers.

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In response to signals and system simulation studies, MATLAB also demonstrated its strong role, with MATLAB simulation for the time signal convolution, discrete, continuous LIT system of time-domain analysis, synthesis and periodic signal of decomposition, the bi-frequency system Domain analysis, signal modulation and demodulation, discrete systems, the Z-domain analysis.

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For the dynamic system of discrete coupled and nonlinear three phase voltage source PWM rectifier, the cycle switch average operator is introduced to transform the discrete system into continuous and the small signal perturbation method is used to transform the nonlinear system into linear, the small signal dynamic mathematical models are set up.

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