THE STATISTICAL DISTRIBUTION OF EXTREME VALUES OF WAVE-CURRENT FORCES ACTING ON SLENDER CIRCULAR CYLINDER IN IRREGULAR WAVES

Based on model test,the statistical distribution of extreme values of wave-current in-line forces acting on vertical circular cylinder is analyzed in this paper.It is shownthat the results calculated by the simplified method,proposed by authors,agree well with the testdata;Weibull distribution is also adoptable in the region of high KC number, and the shapeparameter a and scale parameter β are related well with KC number respectively.     

瞬态瑞利面波技术在地震勘探方面的应用研究

运用瞬态瑞利面小勘探方法可以在寻找激发岩性和提供静校正所需参数方面取得好的效果。     

粗粒土渗透变形机制浅析

对砂卵砾石的渗透变形的形成条件进行了简要分析，在此基础上对渗透变形的形式进行了简要评价，并提出了渗透变形临界坡降的计算方法。     

用超声波技术测量螺栓轴向紧固应力

超声波速度会因材料中加载应力而产生微小的变化，这一现象特别适用于测量螺栓的轴向应力。根据螺栓的轴向应力与超声波传播时间变化率的关系，作者研究了一种可直接测量螺栓轴同应力的仪器。实验结果显示，本项技术十分适合现场的实际应用。     

永定新河河口潮流动力及泥沙特征初步分析

依据永定新河河口１９９７年潮汐观测资料及河道１９９０～１９９７年潮汐观测资料，通过实测资料的整理分析，初步揭示了永定新河河口潮流动力及泥沙特征，为河道的治理规划提供了科学的依据。     

冲击能传感器的研究与分析

本文分析并推导了应力波在弹性体中传播时,质点的运动速度、压力、位移及应力载波的聚流的形成与表达式.利用得到的公式描述了冲击能传感器的工作机理.给出了某风动工具的测试结果.     

Nonreactive atom/molecule-surface scattering within the finite basis wave packet method

A quantum wave packet code for studying nonreactive scattering of closed-shell atoms or diatomic molecules from a rigid surface is described. The time evolution relies on the Chebychev propagator. Up to 5 collider degrees of freedom, 3 in translation and 2 in rotation, are treated in a pseudospectral way with the momentum or finite basis representation as the primary space. Potential matrix elements are efficiently evaluated by means of sequential 1D transformations between momentum and coordinate spaces. Fast Fourier transforms are performed for the translational and azimuthal coordinates whereas a Gauss-Legendre transform is used for the polar coordinate. This pseudospectral strategy minimizes memory requirements because no off-diagonal Hamiltonian matrix elements need to be stored. In addition, a wide variety of physical systems can be studied since no particular functional form is imposed for the interaction potential.     

气体引射器流体动力特性实验研究

在实验装置上对气体引射器计算基本公式进行了实测验证，分析了理论特性曲线的可信度。通过实验，获得一些参数对引射器工况的影响规律。     

CF/ABS树脂复合材料制备工艺对导电性能的影响及对屏蔽性能的理论预测

本文研究了使用溶剂法、密炼机和开炼机混炼碳纤维填充ABS树脂复合材料的导电性能,得到了纤维填充量与复合材料电阻率的关系,对其导电机理进行了分析.通过比较,发现纤维长径比是决定复合材料导电性能的重要因素,其它如纤维在基体中的分布也对复合材料导电性能有影响.最后对复合材料的屏蔽性能进行了理论计算.     

管道流体瞬态—水汽锤计算原理

文中介绍了核电站管道中流体瞬态——水汽锤的计算原理;既适用于液体介质的水锤计算,也适用于可压汽体的汽锤计算.对于一些典型管道部件的处理方法,文中也作了讨论。