In order to overcome the limitation, by using the character of in size order for continuous attributes and error theory of statistics, this paper proposes an algorithm of discretization based on cluster.

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The coordinate transformation and numerical integration was executed on the discretized tetrahedral elements based on which the 3-D MT vector-finite element method was implemented. A whole computation framework for 3-D vector-finite element method with unstructured mesh was given. Based on this some typical models were tested which has demonstrated that our algorithm could distinctively avoid problems caused by the fake solution and both the accuracy and efficiency were enhanced which made our algorithm has a bright future for further application.3. According to theory of Sobolev vector space and the discretization of Helmholtz space, the error estimate which was suitable for 3-D MT vector-finite element modeling was deduced by which the procedure of adaptive technique was guaranteed.4. Based on the fully unstructured tetrahedralization and optical strategy, the 3-D magnetotelluric h-adaptive vector-finite element method was presented through combining the error estimate. With this work, the accuracy and creditableness for 3-D MT complicatedly modeling was guaranteed.5. The 3-D magnetotelluric h-adaptive vector-finite element algorithm with unstructured mesh was implemented.

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The nonlinear sliding mode controller is taken as an example, the implementation form of δ operator discretization control, the error analysis and the algorithms stability are studied both theoty and engineering application.

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DSP is used to realize digital controllers of velocity-loop and position-loop. Analyze and validate that dividing high-level continue controller to several low-level controllers, then discretize the low-level controllers to form series controller can depress the discretization control error.

采用DSP實現(xiàn)速度環(huán)和位置環(huán)的數(shù)字控制器，分析并驗證了連續(xù)域高階控制器分解成連續(xù)域低階控制器黄色视频100种在线视频，將低階控制器離散后進行串聯(lián)控制欧美日韩精品无，這種實現(xiàn)方式的數(shù)字控制器與連續(xù)域控制器之間的控制誤差，將遠小于直接將連續(xù)域高階控制器離散成高階數(shù)字控制器產(chǎn)生的控制誤差一级做a片久久毛片A片。

We use the boundary integral method to simulate the spherically symmetric collapse of a cavitation bubble, a free-surface potential problem having analytical solution. Evolving error curves are given in the thesis, and the influences of various discretization methods on the accuracy and the stability are compared.

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The invention performs pseudo bit error rate statistic by utilizing the message of multi sampling points in each modulation symbol of discretization system, and again performs one-to-one mapping by utilizing corresponding relation between the pseudo bit error rate and the signal-to-noise ratio, thereby obtaining signal-to-noise ratio estimation value.

本發(fā)明利用了離散系統(tǒng)每個調(diào)制符號中多個采樣點的信息進行偽誤碼率統(tǒng)計，再利用偽誤碼率與信噪比之間的對應(yīng)關(guān)系進行一一映射网站18禁，從而得到信噪比估計值免费看sss级黄片。