水闸大孔口淹没堰流泄流能力的探讨

根据牛顿阻力公式和能量方程，初步研究了胸墙流速系数和大孔口淹没堰流流量的计算方法，所得结果得到水槽模型试验资料的检验，并与按孔流方法计算的结果做了比较，获得一些有益的认识．     

《上海新建住区环境优化研究》概要

1 住宅设计引入生态思想1.1 室内外环境统一考虑,使建筑与环境之间成为一个综合有机体。1.2 在平台绿化、人口绿化、街区绿化、组团绿化、林荫道常规绿化以外,增设屋顶绿化、墙面主体绿化,并使室外绿化引入室内。1.3 自然通风除门窗以外,增设墙面通风孔道及中庭通风拔风通道。1.4 加大进深,尽量减少外墙面积,并采用灵活组合的平面。1.5 利用太阳能,除南向玻璃房作被动式太阳室     

金属Ni诱导横向晶化的结构及工艺进程的优化

研究了用Ni进行金属诱导横向晶化(MILC)制备大尺寸多晶硅晶粒的结构改进和工艺条件优化,改进了MILC的结构,通过在埋层氧化层上开出与衬底相连的籽晶区,减少了大晶粒多晶硅中的缺陷分布;同时在前人的基础上优化了退火温度及时间,用Secco腐蚀液观察了晶粒大小和间界分布,最后得到了质量更好的大晶粒多晶硅,其大小在70～80μm左右.同时讨论了MILC后生成的NiSi2的去除方法,成功地去除了高温退火后生成的NiSi2,大大减小了Ni在多晶硅层中的分布,保证了将MILC方法成功应用于实现深亚微米器件的研究中.     

4孔氧枪喷头在25t转炉上的应用

分析了２５ｔ转炉使用４孔氧枪喷冰的设计参数，论证了喷冰和于生产的冶金效果和技术经济指标变化情况。     

A new chaotic secure communication system

The paper proposes a digital chaotic secure communication by introducing a magnifying glass concept, which is used to enlarge and observe minor parameter mismatch so as to increase the sensitivity of the system. The encryption method is based on a one-time pad encryption scheme, where the random key sequence is replaced by a chaotic sequence generated via a Chua's circuit. We make use of an impulsive control strategy to synchronize two identical chaotic systems embedded in the encryptor and the decryptor, respectively. The lengths of impulsive intervals are piecewise constant and, as a result, the security of the system is further improved. Moreover, with the given parameters of the chaotic system and the impulsive control law, an estimate of the synchronization time is derived. The proposed cryptosystem is shown to be very sensitive to parameter mismatch and hence the security of the chaotic secure communication system is greatly enhanced.     

一个水动力泥沙数学模型的伴随算子法敏感性分析

本文报告了把一种高效率的敏感性分析方法一伴随算子法应用到一十水动力泥沙模型的一些初步工作。本文的目的和动机一是问答能否将伴随算子方法应用到包含多种时间尺物理过程的水动力泥抄数学模型中。二是探讨将所得到的敏感性信息如何应甩到与水刹、泥泥工程有关的问题中。将伴随算子方法应用到二维水动力泥沙数学模型中是完全可行的。尽管在数学模型中存在不可微的奇点．由于它们都是孤立的．利用分段求导可以构造伴随模型。     

Stress intensity factors for semi-elliptical surface cracks in plates and cylindrical pressure vessels using the hybrid boundary element method

At first, a hybrid boundary element method used for three-dimensional linear elastic fracture analysis is established on the basis of the first and the second kind of boundary integral equations. Then the concerned basic theories and numerical approaches including the discretization of boundary integral equations, the divisions of different boundary elements, and the procedures for the calculations of singular and hypersingular integrals are presented in detail. Finally, the stress intensity factors of surface cracks in finite thickness plates and cylindrical pressure vessels are computed by the proposed method. The numerical results show that the hybrid boundary element method has very high accuracy for the analysis of surface crack.