Homology Priority Task Scheduling in μC/OS-Ⅱ Real-Time Kernel

μC/OS-Ⅱ is an open source real-time kernel adopting priority preemptive schedule strategy. Aiming at the problem of μC/OS-Ⅱ failing to support homology priority tasks scheduling, an approach for solution is proposed. The basic idea is adding round-robin scheduling strategy in its original scheduler in order to schedule homology priority tasks through time slice roundrobin. Implementation approach is given in detail. Firstly, the Task Control Block （TCB） is extended. And then, a new priority index table is created, in which each index pointer points to a set of homology priority tasks. Eventually, on the basis of reconstructing μC/OS-Ⅱ real-time kernel, task scheduling module is rewritten. Otherwise, schedulability of homology task supported by modified kernel had been analyzed, and deadline formula of created homology tasks is given. By theoretical analysis and experiment verification, the modified kernel can support homology priority tasks scheduling, meanwhile, it also remains preemptive property of original μC/OS-Ⅱ.     

椭圆偏振光理论中一个问题的证明

本文从椭偏光合矢量旋转角速度Ω的表达式出发，对只有沿椭圆长、短轴方向的椭偏光合矢量间的相位差才为的难点给出了证明     

制备介孔复合环境材料的酸洗刻蚀工艺

探索了一种制备介孔复合环境材料的方法--破坏式造孔与有机复合相结合,使最终产品可大量吸附污染水体中的各种污染物并具有一定的杀菌功能.该方法通过酸洗刻蚀,达到了去除原材料中的杂质和刻蚀孔径的目的,所制备的中间产品24h吸湿率为原材料的2倍,染料吸附量为原材料的1.6倍.     

Which survey indicators are useful for monitoring consumption? Evidence from European countries

This paper assesses the information content of two survey indicators for consumption developments in the near future for eight European countries in the period 1985–1998. Empirical work on this topic typically focuses on consumer confidence, the perceptions of buyers of consumption goods. This paper examines whether perceptions of sellers of consumption goods, measured by retail trade surveys, may also improve short‐term monitoring of consumption. We find that both consumer confidence and retailer confidence embody valuable information, when analysed in isolation. For France, Italy and Spain we conclude that adding retail confidence does not improve the indicator model once consumer confidence has been included. For the UK the reverse case is obtained. For the remaining four countries we show that combining consumer sentiment and retail trade confidence into a composite indicator leads to optimal results. Our results suggest that incorporating information from retail trade surveys may offer significant benefits for the analysis of short‐term prospects of consumption. Copyright © 2004 John Wiley & Sons, Ltd.     

CRP复合材料板复合型裂纹扩展方向预测理论研究

本文对碳纤维增强的复合材料板裂纹扩展方向预测理论进行了研究。介绍了最新发展起来的复合材料Z断裂理论 ,并通过试验证明了新理论的正确性     

国内外芯片技术发展状况

微电子产业在国民经济建设和国家安全防卫中极具重要性。10年后硅芯片技术将会被光学计算机，生物计算机，量子计算机所替代。面临发达国家芯片技术的飞速发展，我国必须走自己的CPU核心技术之路。     

生物酶在羊毛织物防毡缩工艺中的应用

将蛋白酶和转移酶E2进行复配，应用于羊毛织物防缩整理，探索了最佳复配方案和工艺条件，经复合酶处理过的羊毛织物，其毡缩率可降低到1.26%，小于机可洗要求3％，应用扫描电镜观察了织物鳞片表层的破坏情况，进而了解酶作用的结果。     

钢—混凝土组合梁的研究与发展

文章对钢—混凝土组合梁的研究和发展进行了分析,并介绍了有关钢—混凝土组合梁的研究方法及值得进一步研究的问题。     

组合桥面板疲劳荷载后剩余承载力试验研究

为了研究高性能混凝土组合桥面板经历疲劳荷载后的剩余承载力,设计制作了两个足尺的正交异性高性能混凝土组合桥面板,通过疲劳和静力加载试验测试了正交异性组合桥面板的静力承载能力、破坏形态与疲劳后剩余极限承载力。试验结果表明：正交异性高性能混凝土组合桥面板经历疲劳荷载后的静力破坏形态为受弯破坏,试件达到极限状态时中支点截面U肋屈曲,受拉钢筋屈服,负弯矩区混凝土板开裂严重,组合桥面板的受力性能发生退化。经过疲劳加载后的桥面板的剩余极限承载力较没有经过疲劳加载的桥面板承载力下降了约11.6%。基于钢筋混凝土黏结滑移理论推导了适用于疲劳荷载作用后的高性能混凝土组合桥面板平均裂缝间距计算公式。对比试验结果,所提出的平均裂缝间距计算公式具有良好的精度,可为实际工程应用提供理论参考。