锁相环

analysis berlekamp massey algorithm

说明：  近似熵matlab代码,可以得到一段数据的近似熵，研究熵领域的话，是一个基础性的程序(Approximate entropy matlab code can get the approximate entropy of a piece of data. If we study the field of entropy, it is a basic program)

互相关计算程序 非常实用的一个数据处理程序 非常好用-interrelated program is a practical data processing procedures are very handy

说明：  pk法求颤振,可以求得机翼的颤振速度，提供参考(pk method the chatter, you can obtain the flutter speed reference)

彩色电视原理 电视机原理的全套教学PPT，讲解细致深入。-Principles of Color TV

Hex evaluation and calculator with logical and arithmetic operators-Hex evaluation and calculator with logica l and arithmetic operators

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采用Drucker-Prager本构，利用ansys的umat进行边坡稳定性分析，求解可获得等效塑性应变(Using Drucker-Prager constitutive model and ANSYS UMAT to analyze slope stability, the equivalent plastic strain can be obtained)

数独是一种源自18世纪末瑞士的数学智力拼图游戏。拼图是九宫格（即3格宽×3格高）的正方形状，每一格又细分为一个九宫格。在每一个小九宫格中，分别填上1至9的数字，让整个大九宫格每一列、每一行的数字都不重复。 数独的玩法逻辑简单，数字排列方式千变万化。不少教育者认为数独是锻炼脑筋的好方法。-Sudoku is a kind of Switzerland originated in late 18th century mathematical intelligence jigsaw puzzle. Puzzle is the squares (ie, 3 cells wide × 3 grid H) of square-shaped, each divided into a fine grid squares. Small squares in each of the respective fill in the figures 1-9, so that the whole big squares in each row, each row will not repeat the figures. The logic of playing Sudoku is simple, the arrangement of the ever-changing figures. Many educators think Sudoku is a good way to exercise their brains.

说明：  2019版FDTD2GDS,最新版的到处GDS文件(2019 version FDTD 2 GDS)