钢螺旋槽管替代高压加热器中的铜光滑管的传热特性研究

电站高压加热器中的铜管由于受锅炉给水ｐＨ值提高的影响,易于腐蚀而造成使用寿命短的问题,开展了采用钢质螺旋槽管替代原来的铜质光滑管并使其达到原来的换热性能的研究．以钢质光滑管、钢质螺旋槽管和铜质光滑管为元件,以水蒸汽－水为介质的立式单管凝结换热试验的结果表明．钢质螺旋槽的总传热系数比钢质光滑管提高了１０％～１７％．这一提高幅度虽没有达到铜螺旋槽管所提高的幅度,但它还是达到了与铜质光滑管的总换热系数相当的程度．因此可以采用钢质螺旋槽管替代高压加热器中的铜质光滑管,实现锅炉给水系统的无铜化要求．     

非线性偏振旋转效应对主动锁模光纤激光器脉冲成形及稳定性的影响

讨论了非线性偏振旋转效应对主动锁模光纤环形激光器脉冲成形及稳定性所起的作用。定性分析和实验结果均表明，适当控制腔内非线性偏振旋转，可形成一种特殊状态，在这种状态下，非线性偏振旋转效应同时起到压窄脉冲和改善稳定性的作用。     

7．5GHz可调谐主动锁模光纤环形激光器

成功地研制了１～７．５ＧＨｚ高重复频率光纤主动锁模环形激光器，得到了变换极限光脉冲，频率调谐范围～４０ｕｍ，器件最高重复率达７．５ＧＨｚ。     

准分子激光泵浦的皮秒染料激光器

利用准分子激光泵浦猝灭式染料激光器，获得了３０ｐｓ的可调谐染料激光脉冲输出。     

准分子激光器及其应用

本文评述了准分子激光在激光加工、激光医疗中的应用前景,非线性光学在准分子激光技术中的运用,以及近年来高重复频率与高亮度准分子的激光器件的新进展。     

Hydrocarbon preservation and formation water geochemistry in abnormal pressure system in the Bawu area of Lishu depression,Songliao Basin,China

The hydrocarbon production in the Bawu area of Lishu Depression is high. However, the Bawu area has undergone three main tectonic movements, the strata were strongly uplifted and eroded, and the fractures were extremely developed. The conditions of hydrocarbon preservation have become intricate. In this study, by analyzing isotopes compositions and geochemical features of formation water, and the characteristics of formation pressure, the hydrocarbon preservation can be deduced. The subnormal and lower normal pressure zones (away from Xiaokuan Fault) of Yingcheng and Shahezi Formations are relatively closed and more conducive to hydrocarbon preservation.     

电磁阀设计中电磁力的工程计算方法

提高新型运载火箭发射的自动化程度需要采用大量电磁类阀门自动器,而电磁力的计算是电磁阀设计中的重要环节.介绍了3种计算直流螺线管式电磁铁电磁吸力的工程方法,即经验公式法、磁路分割法和有限元方法.通过工程实例比较了3种方法的计算特点,包括计算难易程度、计算精度等.由于采用有限元方法可以考虑磁性材料的非线性特性及磁路的漏磁效应,因此磁力计算结果较为精确,适宜在工程设计中推广应用.     

防空导弹武器系统战伤等级评判函数研究

根据防空导弹武器系统的特点，在结合研究其它参考文献中关于其它武器装备战伤等级评判模型的基础上，提出了一种结合防空导弹武器系统综合损伤的等级评判数学模型，可作为防空导弹抢修性设计的理论参考，也可作为其它武器装备系统战伤等级评估的参考．     

轮廓自动匹配方法研究

介绍了用于打击效果评估的目标轮廓自动匹配方法已成为当今的一个研究热点．基于遗传算法和带电粒子模型，提出了一种新的具有仿射不变性的目标轮廓自动匹配方法．该方法首先提取目标图像梯度，然后利用带电粒子模型对图像梯度进行电场化．最后采用模板图像轮廓线在电场化后的梯度图像中的最大能量熵值，利用遗传算法确定先验模板图像与目标图像之间的仿射变换参数，达到轮廓匹配的目的．该方法可完成自动目标轮廓匹配，实验验证了该方法的有效性和鲁棒性．     

On energy efficiency of geographic opportunistic routing in lossy multihop wireless networks

Geographic opportunistic routing (GOR) is an emerging technique that can improve energy efficiency in lossy multihop wireless networks. GOR makes local routing decision by using nodes?? location information, and exploits the broadcast nature and spatial diversity of the wireless medium to improve the packet forwarding reliability. In this paper, our goal is to fully understand the principles and tradeoffs in GOR, thus provide insightful analysis and guidance to the design of more efficient routing protocols in multihop wireless networks. We propose a local metric, one-hop energy efficiency (OEE), to balance the packet advancement, reliability and energy consumption in GOR. We identify and prove important properties about GOR on selecting and prioritizing the forwarding candidates in order to maximize the expected packet advancement. Leveraging the proved properties, we then propose two localized candidate selection algorithms with O(N ³) running time to determine the forwarding candidate set that maximizes OEE, where N is the number of available next-hop neighbors. Through extensive simulations, we show that GOR applying OEE achieves better energy efficiency than the existing geographic routing and blind opportunistic routing schemes under different node densities and packet sizes.