用verilog编写的sigma-delta adc例子

非常全面的数据库管理系统 全面对sql使用，通过实例实践。-A very comprehensive round of the sql database management system used by example in practice.

实现电位器控制舵机的作用旋转，实现了51单片机的AD转换，讲转换的制再转换成舵机的角度(The potentiometer controls the action and rotation of the steering gear, realizes the AD conversion of 51 single chip computer, and then converts the conversion system into the angle of the steering gear.)

多参数描述Lotka-volterra 捕食者猎物曲线模型(Multi parameter description of Lotka-volterra predator prey curve model)

低雷诺k-epsilon 湍流模型方程，流体力学软件COMSOL 3.5的一个例子(This implemented Low-Re k-epsilon Comsol model is based on the Launder-Sharma damping functions as described in Wilcox s Turbulence modeling for CFD book. Model implementation was in 2D under steady state situation but it can be extended to 3D with relative ease.)

说明：  三维下料问题的应用。。。。。。。。。。。。。。。(Three-dimensional packing)

数根 数也有根吗？有！数根就是把一个数的各个数位上的值相加，直到得到一个一位数为止。请你编写一个程序来计算任意数N（0≤N≤1000000000000）的根。 输入： 输入有多个案例。每一个案例为一行，每行只有一个整数N。当输入的N是-1时，输入结束。 输出： 每一个案例输出一行。每行只有一个数字，就是N对应的数根。 Sample input 39 -1 Sample output 3-Number of root number also has roots do? There is! The number of roots is to a number of different values on the digital sum until they have been a number of up to one. Please write a program to calculate an arbitrary number N (0 ≤ N ≤ 1000000000000) roots. Input: Enter a number of cases. Each case for the line, each line is only an integer N. When the input of N is-1, the input end. Output: the output line of each case. There is only one number per line, that is, N corresponds to the number of roots. Sample input 39-1 Sample output 3

EMlog PHP博客系统古典模板，响应式设计，兼容PC+手机，采用宽屏像素设计理念，侧边栏美化以及扩展性强，还有双击自动滚屏功能，网页内的视频、图片、框架都会自适应，使用本套古典风格模板，你不再需要手机版本了，本模板的响应式设计，既是手机版，也是平板、笔记本、PC版，界面效果如截图所示。

说明：  二维声子晶体平面波展开法计算能带结构，xy模态，z模态(Plane Wave Expansion Method for Two-Dimensional Phononic Crystals)

三相PFCmatlab仿真，双环控制，对于初学者有很好的参考价值(Three-phase PFCmatlab simulation, double loop control, for beginners have a good reference value)

最佳信号理论与设计方面的电子书，非常不错，值得推荐(Best Signal Theory and design of e-books, very good, worthy of recommendation)