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vb作的简单打字训练-vb for the simple typing training

实现一个可编程表达式的计算器，并判断输入的表达式是否正确。(Expression of the realization of a programmable calculator, and determine the expression entered is correct.)

代码整洁之道的pdf文档，对于代码如何编写，有较好的帮助(Pdf document with clean code)

ANSYS单元的中文翻译,详细介绍了各单元的用途.-Chinese translation of ANSYS element, setting out in detail the use of the unit.

说明：  传统的永磁同步电机(Permanent Magnet Synchronous Motor, PMSM)自抗扰调速 系统往往存在可调参数多且整定复杂的问题，利用滑模控制方法(Sliding Mode Control,SMC)对自抗扰控制(Active Disturbance Rejection Control, ADRC)结构进行改进，设计了PMSM 调速系统的滑模自抗扰速度控制器和电流控制器。将滑模控制方法引入自抗扰控制结构中，将自抗扰控制中的扩张状态观测器和非线性误差反馈控制律进行优化，在保留自抗扰原有抗扰性能的基础上，简化了参数整定，提高了系统的响应速度和鲁棒性，利用李雅普诺夫理论证明了控制器的稳定性。仿真结果验证了该方法的有效性。(The traditional permanent magnet synchronous motor (PMSM) ADRC system often has many adjustable parameters and complex setting. Using the sliding mode control (SMC) to improve the structure of ADRC (active disturbance rejection control, ADRC), the ADRC speed controller and current control of PMSM are designed Manufacture. The sliding mode control method is introduced into the ADRC structure. The extended state observer and the nonlinear error feedback control law are optimized. On the basis of retaining the original ADRC performance, the parameter setting is simplified and the response speed and robustness of the system are improved. The stability of the controller is proved by using Lyapunov theory. The simulation results verify the effectiveness of the method.)

说明：  Unet实现语义分割，对于初学在帮助很大(Unet realizes semantic segmentation, which is very helpful for beginners)

一个简单的计算器-a simple calculator

本文首先概述了OFDM 的原理、特征和关键技术，介绍了系统需要的几种同步。然后就同步误差对系统性能的影响进行了简单的分析，表明定时偏差和采样频率偏差将会引入码间干扰，载波频率偏差导致载波间干扰的发生。因此，在OFDM系统接收机中定时的确定、载波频率偏差和采样频率偏差的纠正是信号恢复的关键。之后对OFDM系统同步的几种实现方法进行了介绍，分析了各同步方法的性能。-The paper first outlines the principles of OFDM, features and key technologies, the system needs to introduce several synchronization. Synchronization error and then the impact on system performance for a simple analysis, show that the timing deviation and the sampling frequency deviation will introduce inter-symbol interference, the carrier frequency deviation led to the occurrence of ICI. Therefore, in OFDM system receiver to determine the timing, carrier frequency offset and sampling frequency offset correction signal to restore the key. After the OFDM system to achieve synchronization of several methods of introduction, an analysis of the performance of the synchronization method.

PHP从别个人那下的简单网页程序 有注册系统 拿了改改图片就能用-PHP from other individuals, under a simple web application that has changed registration system took a picture can be used to change

网站图标，很实用的网站图标，可以用于网站的ＬＯＮＧＯ，个人名片等等，解压密码为www.csai.cn-website icon, a very useful icon on the website, which can be used for LONGO, personal business cards and so on. extract passwords to www.csai.cn