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qdpsk调制主要是帮助那些需要代码的朋友们，这些代码仅作参考，如有疑问请留言！！！谢谢(qdpsk modulation is mainly to help friends who need the code, the code is only for reference, if any questions please leave a message! ! ! Thank you)

这是我自编的PQ分解法小程序，采用极坐标形式表示节点电压。(This is my small self of the PQ decomposition process is expressed by polar coordinates node voltage.)

MATLAB学习资料，新手和有经验的都可以使用，英文文章，适合英文好的人使用(MATLAB learning materials, novice and experienced can use the English articles, suitable for the use of good English)

B-Spline Surface Least-Squares Fitting of both Positions and Normals.

空气中声传播的fdtd例程，简单可用，希望对大家有帮助(Fdtd airborne sound propagation routines, simply available, we hope to help)

FACIAL EXPRESSION RECOGNITION

the source code used for image compression using wavelet transform. to use this codes u have to first convert RGB image to grayscale and also its colourmap

此程序把M序列作为输入，使用最小二乘法对系统进行辨识，实现最小二乘的基本功能(M sequences in this program as input, using the least squares method to identify the basic functions of the least squares)

this is a wind power generation with MPPT

矿用电机车电控系统有两种,一种是有触点的电控系统,另一种是脉冲调速系统。以晶闸管为主要元件的脉冲调速系统在矿用电机车中仍大量使用。晶闸管属于半控型器件,其控制极只能控制开通而不能控制其关断,在低速运行时,晶闸管一经导通后,如果不能根据需要关断,则电动机承受全部电压而失去控制,电机车全速运行。本文利用MATLAB软件对矿用电机车晶闸管脉冲调速系统的主电路进行建模并仿真,对影响安全运行的关键元器件进行了详细的分析。仿真结果表明晶闸管脉冲调速系统存在安全隐患。随着电子工业的飞速发展,一种新型的全控型电力器件(绝缘门极晶体管IGBT)开始在工业中得到广泛的应用,脉冲调速电控系统如采用全控型电力器件代替半控型元器件(晶闸管),将会大大简化控制电路。由于控制电路简单,便于实现数字化控制。本文对IGBT的调速原理进行分析,采用IGBT和集成PWM脉宽调制器SG3525为主要元件,设计出了双闭环可逆自动调速系统,并对该系统进行实验验证,实验结果表明该系统优于晶闸管直流调速系统,而且运行稳定,可以很方便实现可逆运行。(Mine electric locomotive electronic control system has two types of electronic control system with contacts, and the other is the pulse speed control system. The pulse thyristor as the main component in the mining electric locomotive speed control system is still widely used. A semi-controlled thyristor type devices, the control can only control a very open and can not control the turn-off, in the low speed, the thyristor turn-on once, if not turned off as needed, then the loss of the motor under full voltage control, motor vehicle running at full speed. In this paper, MATLAB software mining electric locomotive speed control system pulse thyristor main circuit modeling and simulation, the key components of the safe operation of a detailed analysis. Simulation results show that the thyristor pulse control system security weaknesses. With the rapid development of the electronics industry, a new full-controlled power devices (Insulated Gate Transistor IGBT) began to be widely used in indu)