test5

这是一篇关于扩展有限元很好的文章，建议学习有限元的人阅读。(This is a very good paper (A new method for modelling cohesive cracks using nite elements) for the learner of XFEM.)

堆栈的一些主要功能函数头文件,可以导入后直接调用-Some function about satck in a head file

Enderton H.B. Elements of set theory (AP, 1977)(K)(T)(ISBN 0122384407)(289s)_MAa_

说明：  大致思路说说，就是在外部SRAM里面做了一个大数组[320][240]做了一帧缓冲，所有屏幕相关操作都是在这一帧上面实现的，使用DMA直接丢数据到FSMC接口上，比I/O快多了，然后就是资源的去背问题，所有的图片都是我从手机版上面截图下来的，然后背景色都是0X4DF9，然后因为jpg转换软件的关系，蓝色的背景色会有偏差所以直接判断把0x4df9不显示不可行，后来想到可以用RGB颜色来入手，虽然不是0x4df9但是还是蓝色，所以蓝色分量肯定比红色多，所以做了一个阈值判断(Roughly speaking, a large array [320] [240] is made in the external SRAM to do a frame buffer. All screen-related operations are implemented on this frame. Using DMA to drop data directly to the FSMC interface is much faster than I/O. Then it is the problem of resource backtracking. All the pictures are taken from the top of the mobile version, and then the background color is 0X4DF9. Later, because of the relationship between JPG conversion software, the blue background color will be biased, so it is not feasible to directly judge that 0x4df9 is not displayed. Later, I thought that RGB color can be used to start with. Although it is not 0x4df9, it is still blue, so the blue component must be more than red, so I made a threshold judgment, and then it is the transition between scene and scene.)

codigo fuente para esclavo esp8266 comunicacion con plc de siemens(source code for esp8266 and profinet plc siemens)

说明：  python与机器学习实战教程，机器学习通过Python语言实现，通过大量的实例再现机器学习强大的生命力(Python and Machine Learning Practical Course. Machine Learning is realized by Python Language, and the powerful vitality of machine learning is reappeared through a large number of examples.)

自己用原创算法写的一个俄罗斯方块程序 QT4下编译-Tetries for QT/C++

应用背景可编程逻辑控制器，它采用一类可编程的存储器，用于其内部存储程序，执行逻辑运算、顺序控制、定时、计数与算术操作等面向用户的指令，并通过数字或模拟式输入/输出控制各种类型的机械或生产过程。关键技术PLC的用户程序可以在实验室模拟调试，输入信号用小开关来模拟，通过PLC上的发光二极管可观察输出信号的状态。完成了系统的安装和接线后，在现场的统调过程中发现的问题一般通过修改程序就可以解决，系统的调试时间比继电器系统少得多。这里包含了12个典型例程，可直接调试运行。

Sherlock - Find usernames across social networks

用matlab编写的地震正演及波场快照，适合初学者学习研究。(Matlab prepared by the earthquake forward and wave field snapshot, suitable for beginners to learn research.)