Ada软件数据流分析方法及其实现

简要介绍了有关数据流分析的基本概念之后，较为着重地讨论了一种基于静态分析的Ａｄａ软件数据流分析方法，同时也讨论了分析过程中一些实现原理。实践结果表明，文中讨论的数据结构，实现机制与处理方法是行之有效的。     

航空产品加速寿命试验研究及应用

对加速寿命试验的理论及航空产品加速寿命试验的实例进行了简要阐述，并对航空机械产品的可靠性加速寿命试验与长试等效加速寿命试验的特点及困难进行了初步的分析，对今后的研究提出了一些看法。应用实例中的方法和结论对同类航空产品有积极的参考价值。     

弹塑性条件下工程小裂纹疲劳扩展试验研究

 本文对在弹塑性条件下工程小裂纹的疲劳扩展规律进行了分析研究。给出了用△J积分作为在弹塑性条件下疲劳裂纹扩展主要控制参数的表达式。对工程小裂纹在缺口循环塑性区中的扩展规律提出了用修正的△J_(eff)积分描述和分析的表达方法,并与试验结果进行了比较。     

广义奇异摄动降阶方法在控制器降阶中的应用

 首先推导了广义奇异摄动降阶和奇异摄动降阶的 Schur方法,解决了均衡变换可能出现病态的问题,并且算法具有较好的鲁棒性。然后,将其应用于控制器降阶,并同其它方法比较,认为原系统带宽附近的控制器降阶误差对降阶效果影响较大,而广义奇异摄动降阶法通过参数α的选择,能取得较好的降阶效果。可供工程设计参考。     

基于组装的过程工程环境

描述了一个基于组装的过程工程环境，该环境包括过程定义，过程实例化，过程模拟，过程动作４个部分，采用了基于组装的过程建模方法，能够对重用过程库中的过程部件进行组装，生成新的过程模型，并由过程模型驱动实际运作。     

论工科院校生创新能力的培养

摘 要 本文对目前工科院校生创新能力缺乏的现象进行了剖析，并对工科生创新能力的培养提出了几点粗浅的看法，以求工科毕业生能适应知识经济的发展要求。     

星载软件可靠性设计方法

分析了星载软件及其可靠性的特点，针对空间环境对星载软件的影响，提出了软件工程化、模块化和容错设计、遥测遥控处理，以及异常检查等提高软件可靠性的设计措施，并说明了软件测试对提高可靠性的重要性。     

Survey of mission evolution and flexibility in the Space Shuttle program

Given the diversity of missions it has accomplished and the myriad of adaptations it has undergone, the US Space Shuttle is widely regarded as a highly flexible space vehicle. With the Shuttle’s upcoming 2011 retirement, it is instructive to survey the history of this vehicle’s flexibility for the insights it can provide to the design and characterization of flexibility in future space systems. Data are presented on the evolution of mission requirements over time for 120 missions performed by the Space Shuttle over a period of some 27 years. Distinct trends in the time domain – as well as their causes – are identified and discussed, and early manifest plans from 1982 serve as a confirmation that these trends were not originally anticipated. Eight examples are then presented of engineering modifications that allowed the Shuttle to adapt and accommodate these requirement changes. Several additional instances of Shuttle flexibility are explored, such as post-Columbia disaster modification, upgrade programs and derived vehicles, and one case in which flexibility was inhibited by an early design decision.     

Radiation engineering analysis of shielding materials to assess their ability to protect astronauts in deep space from energetic particle radiation

An analysis is performed on four typical materials (aluminum, liquid hydrogen, polyethylene, and water) to assess their impact on the length of time an astronaut can stay in deep space and not exceed a design basis radiation exposure of 150 mSv. A large number of heavy lift launches of pure shielding mass are needed to enable long duration, deep space missions to keep astronauts at or below the exposure value with shielding provided by the vehicle. Therefore, vehicle mass using the assumptions in the paper cannot be the sole shielding mechanism for long duration, deep space missions. As an example, to enable the Mars Design Reference Mission 5.0 with a 400 day transit to and from Mars, not including the 500 day stay on the surface, a minimum of 24 heavy lift launches of polyethylene at 89,375 lbm (40.54 tonnes) each are needed for the 1977 galactic cosmic ray environment. With the assumptions used in this paper, a single heavy lift launch of water or polyethylene can protect astronauts for a 130 day mission before exceeding the exposure value. Liquid hydrogen can only protect the astronauts for 160 days. Even a single launch of pure shielding material cannot protect an astronaut in deep space for more than 180 days using the assumptions adopted in the analysis. It is shown that liquid hydrogen is not the best shielding material for the same mass as polyethylene for missions that last longer than 225 days.     

关于计算机描述工程图形的相关性参数数据设计方法

参数数据是计算机描述工程图形的数据结构形式，利用工程图形形过程中各图素之间几何特征的相关性，组成描述图形相关参数数据结构，使图形数据的存储读取更加灵活，为图形处理规律化提供了较为广阔的前景。