Objective To introduce and discuss the fundamentals of earned value project management Work Breakdown Structures Program plans and schedules Earned value management systems Cost and schedule variances Estimates at completion

航空材料与航空技术的关系极为密切，航空航天材料在航空产品发展中具有极其重要的 地位和作用：航空材料既是研制生产航空产品的物质保障，又是推动航空产品更新换代的技 术基础

How do you start? Assume the audience is technically competent, but isn't familiar with your project? What do they need to know first?

Prof. Manuel Martinez-Sanchez Page 2 of 11Bohm velocity: Why?

11.1 空间站的概念和组成 11.2 空间站的导航、制导与控制

JB=Beam ion (and neutralizer electron current) JE=cathode emitted current Jc=ion current to cathode- potential surfaces JD=current through disch. power supply

9.1 载人飞船的结构组成 9.2 载人飞船的制导与控制 9.3 载人飞船的再入返回控制

These notes aim at providing order-of-magnitude results and at illuminating the mechanisms involved. Numerical precision will be sacrificed in the interest of physical clarity. We look first at the arc in a cooled constrictor, with no flow, expand the analysis

1 Introduction Electrostatic thrusters (“ion engines”) are the best developed type of electric propulsion device, dating in conception to the ‘50’s,(1) and having been demonstrated in space in 1964 on a suborbital flight of the SERT I spacecraft(2). The early history

Ionization and Conduction in a High-pressure Plasma A normal gas at T <3000K is a good electrical insulator, because there are almost no ∼ free electrons in it. For pressure