File

说明：  trial license file supermap application

说明：  会议室预约系统是一个基于 PHP/MySQL 开发的，使用浏览器访问的会议室预订系统。使用区域对会议室进行分组管理。(meeting The conference room reservation system is a conference room reservation system based on PHP/MySQL and accessed by browser. Group management of conference rooms using areas)

说明：  270V直流无刷电动机调速系统设计，性能可自行调试，也可直接使用调试好的参数。(270V brushless DC motor speed control system design, the performance can be adjusted by itself, or directly use the parameters adjusted.)

伯克利大学量子计算课程讲义（cs191）berkeley university quantum computing course lecture notes-berkeley university quantum computing course lecture notes

说明：  取送货问题 取送货目前是个流行的热门，其调度问题被广泛研究(Pickup and delivery is currently a popular hot topic, and its scheduling problem is widely studied)

说明：  多进制数字相位调制也称多元调相或多相制。它利用具有多个相位状态的正弦波来代表多组进制信息码元,即用载波的个相位对应于组进制信息码元。如果载波有2k个相位，它可以代表k位进制码元的不同码组。多进制相移键控也分为多进制绝对相移键控和多进制相对(差分)相移键控。(This m-file simulates mpsk (BPSK,QPSK,8PSK)with theoretical and simulated results using Gray coding. Numerical examples of a satellite link design are shown using QPSK and/or 8PSK when the bit rate(Rb)is greater than the channel bandwidth Wc (Band-limited channel).)

说明：  一款四轴无人机开源代码，包括pid控制等内容(Open Source Code for a Four-Axis UAV)

C# 分组查询数据库内容，可将查询条件分组后进行整合查询，有效提升查询性能，本源码仅是提供一种思路，实际应用时，需要对代码进一步完善。

一款jQuery 3D立方体翻转插件。该插件可以创建水平或垂直的3d立方体效果，(A jQuery 3D cube flip plug-in. The plug-in can create horizontal or vertical 3D cube effects.)

4）读取音乐信号romanza_pe.wav, 截取其前10s信号，选择适当的窗口类型和窗口宽度，显示其短时傅立叶频谱，以便能更清晰地看清谱线。说明信号频谱特点。 5）令D=5下采样音乐信号，播放其声音并显示其短时傅立叶频谱。描述并解释你所听到的声音和观察到的频谱之间的关系() Read the music signal romanza_pe.wav, intercept its first 10 s signal, select the appropriate window type and window width, display its short-time Fourier spectrum, so as to be able to see the spectrum lines more clearly. The characteristics of signal spectrum are explained. 5) let D=5 sample the music signal, play its voice and display its short-time Fu Liye spectrum. Describe and explain the relationship between the voice you hear and the observed spectrum.)