3DT

说明：  数据用socket写入到三菱系列PLC中，读取或写入数据。(send data to mitishubishi PLC with socket)

侧带缩略图的jQuery焦点图代码，可用于个人博客或企业站点展示，宽屏时效果比较好(JQuery Focus Diagram Code with a side thumbnail that can be used for personal blogs or corporate site presentations. Wide screen is better)

双重差分估计 双重差分模型（difference-in-difference，DID）近年来多用于计量经济学中对于公共政策或项目实施效果 的定量评估。 通常大范围的公共政策有别于普通科研性研究，难以保证对于政策实施组和对照组在样本分配上的完全随机。非随机分配政策实施组和对照组的试验称为自然试验（naturaltrial），此类试验存在较显著的特点，即不同组间样本在政策实施前可能存在事前差异，仅通过单一前后对比或横向对比的分析方法会忽略这种差异，继而导致对政策实施效果的有偏估计。(Quantitative evaluation of policy or project implementation effect. Generally, a wide range of public policies is different from general scientific research, and it is difficult to ensure that the sample allocation for the policy implementation group and the control group is completely random. The non-randomly assigned policy implementation group and the control group are called natural trials, which have significant characteristics, i.e. there may be prior differences between the different groups of samples before the implementation of the policy, and this difference will be ignored only through a single pre-and post-comparison or horizontal comparison analysis method, which leads to the policy. Biased estimation of implementation)

Flash+XML文字无缝滚动动画，可自定义多组文字自动滚动切换，每次出现一个文字变量中的内容，左右方式的滚动，也可手动控制文字左右切换，文字滚动背景和字体样式在Flash中可自定义调整。

C语言两种窗口屏幕截图的方法， 一种是通过PrintWindow 实现，可以后台截图， 另一种是通过dib实现，源码很简单，一看就能明白是什么意思。

PNX1005 mini case study

C++做到飞行游戏，比较好玩，可以供参阅和学习-C++ to do the flight game, more fun, can be used for reference and learning. .

labview开发的汽车驾驶模拟系统，使用图形和声音等多媒体元素，很好地实现了汽车加减油门、档位、刹车、转向等操作时汽车状态的模拟，一款简单实用的汽车驾驶模拟软件。(labview Driving the development of simulation systems, such as the use of graphics and multimedia elements of voice, a good addition and subtraction to achieve a car accelerator, stalls, brakes, steering and other vehicle operating status of the simulation, a simple and practical car driving simulation software.)

python3 taskw module

jquery电子杂志幻灯片特效幻灯片杂志特效图片切换(Special effect picture switching of slide based on jQuery general purpose slide)