直流调速

球钟问题描述:球钟是一个利用球的移动来记录时间的简单装置。它有三个可以容纳若干个球的指示器：分钟指示器，五分钟指示器，小时指示器。若分钟指示器中有2个球，5分钟指示器中有6个球，小时指示器中有5个球，则时间为5:32。(Ball bell Problem Description: Ball Clock is a use ball movement to record the time of simple devices. It has three balls can accommodate a number of indicator: Indicator minutes five minutes indicator, hour indicator. If the indicator is 2 minutes balls for 5 minutes with six balls indicator, hour indicator has five balls, the time is 5:32.)

说明：  基于Twincat3平台的PLC编程教程，使用ST语言控制电机运动(Based on twincat3 platform PLC programming course, using ST language to control motor movement)

PID控制列车速度跟踪，使其实际速度曲线跟踪目标速度曲线(PID control of train speed tracking)

说明：  API网址缩短程序网站源码轻轻松松缩短你的网址链接(API Web Site Shortening Program Web Site Source Softly Shorten Links to Your Web Site)

并行计算课程PPT和实验指导，有pthread和OpenMP讲解，还有一些基础介绍(Parallel computing course PPT and experimental guidance, there are pthread and OpenMP to explain, and there are some basic introduction)

programing of html, php, js no hackq

c语言基本变量定义, 对编程语言的基本类型进行重新定义(The definition of basic variables in C language redefines the basic types of programming languages.)

说明：  MQTT协议 3.1.1中文版 MQTT是一个客户端服务端架构的发布/订阅模式的消息传输协议。它的设计思想是轻巧、开放、简单、规范，因此易于实现。这些特点使得它对很多场景来说都是很好的选择，包括受限的环境如机器与机器的通信（M2M）以及物联网环境（IoT），这些场景要求很小的代码封装或者网络带宽非常昂贵。(MQTT is a messaging protocol in publish/subscribe mode of client server architecture. Its design idea is lightweight, open, simple and standardized, so it is easy to implement. These features make it a good choice for many scenarios, including limited environments such as machine-to-machine communication (M2M) and Internet of Things (IoT), which require very small code encapsulation or very expensive network bandwidth)

计算器，可进行四则运算，并且有符号位，退格，以及小数点。(Calculator, can be carried out in four operations, and the sign bit, backspace, and decimal point.)

说明：  一款非常好用的汉字取模软件推荐给大家，大家可以试试。(A very easy to use Chinese character module software recommended to you, you can try.)