对地观测旋转扫描辐射计星上定标系统设计

文中介绍了一种对地观测旋转扫描辐射计星上定标系统的设计。该星上定标系统由漫射板、定标灯、黑体、定标均衡装置、漫射板稳定性监测器和太阳入射角监测器等几部分组成。文中描述了该定标系统各部分的作用和功能,并针对提高星上定标精度提了几点建议。     

Numerical investigation on the shock wave transition in a three-dimensional scramjet isolator

The scramjet isolator, which is used to prevent the hypersonic inlet from disturbances that arise from the pressure rise in the scramjet combustor due to the intense turbulent combustion, is one of the most critical components in hypersonic airbreathing propulsion systems. Any engineering error that is possible in the design and manufacturing procedure of the experimental model, and the intense heat release in the scramjet combustor, may cause the performance of the isolator to decrease, leading to its lack of capability in supporting the back pressure. The coupled implicit Reynolds Averaged Navier–Stokes (RANS) equations and the two-equation standard k?ε turbulent model have been employed to numerically simulate the flow fields in a three-dimensional scramjet isolator. The effects of the divergent angle and the back pressure on the shock wave transition and the location of the leading edge of the shock wave train have been estimated and discussed. The obtained results show that the present numerical results are in very good agreement with the available experimental shadow-pictures, and the numerical method is more suitable for capturing the shock wave train and predicting the location of the leading edge of the shock wave train in the scramjet isolator than the present two-dimensional numerical methods. This is due to the small width-to-height ratio of the isolator and the intense three-dimensional flow structures. On increasing the divergent angle of the scramjet isolator, the static pressure along the central symmetrical line of the isolator decreases sharply. This is due to the strong expansion wave generated at the entrance of the isolator, and when the divergent angle of the isolator is sufficiently large, namely 1.5°, a zone of negative pressure is formed just ahead of the leading edge of the shock wave train. At the same time, the shock wave train varies from being oblique to being normal, and then back to oblique. With an increase in the prescribed back pressure at the exit of the scramjet isolator, the leading edge of the shock wave train moves forward towards the entrance of the isolator, and when the back pressure is sufficiently large, unstart conditions in the hypersonic inlet can take place if the shock train reaches the inlet.     

关于圆轴含有弯弯组合的合成弯矩图形状的讨论

本文结合弯弯扭组合变形的例题，利用相关数学知识，证明了圆轴含有弯弯组合的合成弯矩图如果出现曲线，则该曲线必是(上)凹的。     

论知识经济时代企业财务管理的变革

21世纪是知识经济迅速发展的经济时代，知识经济的发展一方面表现为知识对传统产业的高度渗透另一方面表现为高新技术产业的迅速发展。为此，人们传统的工作方式、管理方式以及生活方式将逐渐被打破。这给传统的财务管理理论和方法带来了机遇和挑战，一个新的财务管理时代正在到来。     

如何发挥体育教学在素质教育中的作用

学校体育是学校教育的重要组成部分,是素质教育不可缺少的重要内容.素质教育是以人的身心发展和个人的素质提高为目的的教育,无论是谁,无论从哪个角度来研究素质教育,都离不开体育教育,学校体育作为素质教育的重要内容和手段,对学生其他素质的提高具有重要的作用.所以必须运用素质教育的原则来进行体育教学.     

目标成本管理在汽车零部件行业应用研究

汽车零部件行业生命周期相对固定、事先确定销售价格、产量预测较为明确等特点使该行业具有目标成本管理的先天优势。而一个产品在生命期必然面对客户每年提出的降价要求,因此如果简单地运用目标价格扣减目标利润的公式难以真正实现产品盈利的目标。文章认为目标成本的确定应该结合产品生命期内的现金流分析,在满足项目评价指标的前提下,在整个生命期内对产品进行成本规划。文章以KD公司为案例企业,对其基于产品生命期现金流的目标成本管理的具体应用方法进行了研究,肯定了其取得的良好效果。     

提高飞机使用可用度的途径

飞机的使用可用度是与飞机战备完好性相关的重要参数,本文研究了提高飞机使用可用度的途 径,并提出了飞机可用度最低门限值的概念     

应用组合除尘技术治理手烧炉烟尘

本文介绍了一种集多种湿法除尘技术之长处于一体的新型组合式除尘装置，该装置不仅能有效地消除手烧锅炉燃烧时产生的烟尘，而且实现了除尘水的内循环，消除了其它湿式除尘器所带来的水的二次污染问题。     

－类非线性微分方程解空间显易结构的唯一性

对所有形如的方程的集合Ｅ（Ｄ），引入线性变换群Ｇ（Ｄ），从而将Ｅ（Ｄ）进行等价分类，并由此提出解空间显易结构唯一性概念，指出Ｂｅｒｎｏｕｌｌｉ类方程具第一显易结构，但其显易结构不唯一，而任何非Ｂｅｒｎｏｕｌｌｉ类方程着具显易结构，则其显易结构必唯一．     

计量用高精度电脑控温仪的研制

高精度电脑控温仪是计量等行业急需的一种仪表,本文介绍了在研制高精度电脑控温仪过程中所解决的主要技术问题.该控温仪采用了单片机技术以及高精度测温、温度预测、与模糊控制理论相结台的特殊PID控制等多个独特的技术措施,在恒温槽上实现了±0.01℃的控制精度.该项目已通过部级鉴定并在生产中应用.