qt 串口工具

该源程序是基于虚拟仪器的心音图形显示系统，主要实现体表心音的采集和实时显示,心音信号的频谱分析以及临床听诊库的管理-The source code is based on heart sound virtual instrument graphical display system, mainly to achieve surface collection and real-time display of heart sound, heart sound signal spectrum analysis and management of clinical auscultation Library

资源描述本源程序是基于C#的时钟设计，能为初学者提供参考价值，为初学者提供基本的编写代码思路， namespace Clock { public partial class MainForm : Form { private PointF center; private float r; private Pen hourPen; private Pen minutePen; private Pen secondPen; private Thread timeThread; public MainForm() { InitializeComponent(); ShowInTaskbar = false;//不在任务栏中显示 SetStyle(ControlStyles.DoubleBuffer, true); SetStyle(ControlStyles.UserPaint,true); SetStyle(ControlStyles.AllPaintingInWmPaint,true); center = new PointF(ClientSize.Width/ 2.0f, ClientSize.Height/ 2.0f); r = Math.Min(ClientSize.Width / 2.0f, ClientSize.Height / 2.0f); hourPen = new Pen(Color.Black, 2.5f); minutePen = new Pen(Color.Black, 1.5f); secondPen = new Pen(Color.Black, 0.5f); timeThread=new Thread(new ThreadStart(DrawTime)); timeThread.Start(); } protected override void OnPaint(PaintEventArgs e) { Graphics g = e.Graphics; g.Clear(BackColor); //g.SmoothingMode =

Proteus软件是英国Labcenter electronics公司出版的EDA工具软件（该软件中国总代理为广州风标电子技术有限公司）。它不仅具有其它EDA工具软件的仿真功能，还能仿真单片机及外围器件。它是目前最好的仿真单片机及外围器件的工具。虽然目前国内推广刚起步，但已受到单片机爱好者、从事单片机教学的教师、致力于单片机开发应用的科技工作者的青睐。应用的科技工作者的青睐。应用的科技工作者的青睐。

windows标准的datetime控件的使用实例，用pelles C编写-standard datetime control sample, program in pelles C

一个报表打印类的例子- A report form printing class example

This routine draws Barnsley s fern, The transformations for the fern are each in the form T(x,y = (a*x+b*y+e, c*x+d*y+f). If the probability that a particular transformation T is selected is p, you can characterize each transformation by providing the values of a,b,c,d,e,f, and p, in that order. -This routine draws Barnsley s fern, The transformations for the fern are each in the form T (x, y = (a* x+ B* y+ E, c* x+ D* y+ F). If the probability that a particular transformation T is selected is p, you can characterize each transformation by providing the values of a, b, c, d, e, f, and p, in that order.

仪表监视控件，感觉还不错

简单的界面,用了java网格布局,盒状布局,卡片布局.前面,还有一个登陆界面-simple interface, with a java Mesh Board, a box-like layout, and layout of the cards. Front There is also a landing interface

c开发的火焰程序，是一个可以模拟火焰的小程序-the flame process, the flame can simulate a small procedure

人们在使用SQL时往往会陷入一个误区，即太关注于所得的结果是否正确，而忽略了不同的实现方法之间可能存在的 性能差异，这种性能差异在大型的或是复杂的数据库环境中（如联机事务处理OLTP或决策支持系统DSS）中表现得尤为明 显。笔者在工作实践中发现，不良的SQL往往来自于不恰当的索引设计、不充份的连接条件和不可优化的where子句。在对 它们进行适当的优化后，其运行速度有了明显地提高！下面我将从这三个方面分别进行总结：-people in the use of SQL often fall into the trap, that is too focused on the findings is correct, and ignore a different method may exist between the performance differences, these differences in large or complex database environment (such as online transaction processing or decision support OLTP system DSS) has become even more obvious. In practice I found that the poor tend to SQL from inappropriate design of the index, not fully connected and non-optimal conditions where the phrase. On their proper optimization, and their operating speed has been improved! Now I will be three aspects of this summary :