次同步振荡

西门子仿真编程软件S7-PLCSIM V5.4，用于S7-300/400系列PLC程序的仿真(S7-PLCSIM V5.4 offers the following new features with this release: DP, Industrial Ethernet and PC Internal connection types supported in addition to MPI Formerly, S7-PLCSIM used a default connection of MPI, address 2. With S7-PLCSIM V5.4, you can browse STEP 7 projects and select a networked node for establishing a simulation connection. S7-PLCSIM simulates the CPU of the selected node, all nodes that belong to that CPU, and the subnet of the selected node. Increased number of blocks supported for simulation S7-PLCSIM supports a set of OBs, SFBs, and SFCs as described in the electronic manual and online help. Of these, some are NOPs that is, they do not perform any operation. With S7-PLCSIM V5.4, the number of blocks that are not NOPs has increased.)

FORTRAN95程序设计教程,彭国伦带标签版，很好用哪(this book is really good because it has label making the reading easier.)

求解拉伐尔喷管程序，（1）空间离散格式：采用JST 或Roe格式； （2）时间离散格式：显示Runge-Kutta格式； （3）几何参数和入口参数(Solve the laval nozzle procedure)

高阶累积书籍，包含了双谱，1.5维谱的讲解和编程，值得拥有(High-end accumulation of books, including the bispectrum, lectures and programming 1.5 dimensional spectrum, worth having)

说明：  电机的测试平台，可测电流，热电偶，转速，与yokokawa的测功机通讯，并记录为xls数据表的程序(Motor test platform, measurable current, thermocouples, speed, and the dynamometer yokokawa communications, and record the data tables for the procedure xls)

说明：  操作系统课件 习题 ppt 和很好的课后习题答案(Operating system software ppt and good after-school exercises exercises answers)

正则表达式，精通正则表达式，第三版，非常好的学习正则表达式的书籍(Regular expressions, mastering regular expressions, Third Edition)

西安交通大学的《自制可编程控制器》电子书(Xi)

ssd1 exercise1 practial答案(ssd1 exercise1 practial answer)

关于SDRAM的文件为了下载传上来的 这回够20字可以下了吗(About the pass file to download to the SDRAM)