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这是项目管理中的项目预算部分，只前培训用的，适合初学者(This is the project management part of the project budget, only use pre-employment training for beginners)

一篇关于如何提高单片机运行速度的文章!(An article on how to improve the operating speed of Singlechip article!)

office使用小诀窍，详细介绍了office组件的各种简单的快捷的操作方式，对于办公室人员是很好的助手。(Office use tips, detailed introduces the office components, different kinds of simple and quick operation is a good helper for the office personnel. )

Gocad是国际上公认的主流建模软件，在众多油公司和服务公司得到了广泛的应用。Gocad是以工作流程为核心的新一代地质建模软件，实现了高水平的半智能化建模，具有功能强，界面友好，易学易用，并能在几乎所有硬件平台上（Sun, SGI, PC-Linux, PC-Windows）运行的特点。 (Gocad is internationally recognized as a mainstream modeling software, in many oil companies and service companies have been widely used. Gocad based workflow as the core of a new generation of geological modeling software, to achieve a high level of semi-intelligent modeling, with powerful, user-friendly, easy to use, and can be in almost all hardware platforms (Sun, SGI, PC-Linux, PC-Windows) running characteristics.)

说明：  池永宁的低压穿越PPT，介绍了各个国家对风电场低压穿越的要求，以及为什么要就风电场具有低压穿越的能力。(The PPT of Low Voltage Through)

gdb的调试工具指南，希望对广大朋友有所帮助。(gdb debugging tools guide, hope to help our friends.)

PEMFC混合动力系统的DCDC变换器设计，包括建模和控制方法。(PEMFC hybrid system DCDC converter design, modeling and control methods.)

c8051f02系列芯片手册,具体型号为c8051f020

说明：  目前牵引变压器差动保护原理在某些因素的影响下并不能准确地区分变压器内部故障和外部故障，可能造成保护误动或拒动，危及电气化铁道系统的安全运行。针对这一现状，建立了计及铁芯非线性特性和磁滞效应而又无需铁芯的B－H曲线数据的牵引变压器模型，提出了一种通过参数辩识理论来辩识牵引变压器绕组参数实现牵引变压器微型机保护的方法。该方法能有效地区分内部故障、外部故障和励磁涌流。仿真计算表明了该方法的正确性和可行性。(Traction transformer differential protection principle in the safe operation and can not accurately distinguish between the transformer internal faults and external faults, may be to cause protection mistaken or refuse to move, endangering the electrified railway system under the influence of certain factors. In response to this situation, taking into account the core nonlinear characteristics and hysteresis and without traction transformer core of the B-H curve data model, a the traction transformer winding identification through parameter identification theory parameters to achieve traction transformer microcomputer protection. This method can effectively distinguish internal faults, external faults and magnetizing inrush current. The simulation results show that the correctness and feasibility of the method.)

bpa安装说明，告诉你如何安装bpa和他的破解包(bpa installation instructions tell you how to install the bpa and his crack kits)