宜兴抽水蓄能电站上库主坝堆石料的特殊研究

针对宜兴抽水蓄能电站上库主坝建在倾斜基础面上的实际情况,对坝体堆石料特性进行了两项特殊研究.现场试验研究表明各种堆石料与基岩面之间的抗剪强度均小于该种堆石料本身的抗剪强度,加大基岩面的粗糙度有利于提高该项抗剪强度.对砂岩夹泥岩堆石料浸水后变形特性的室内试验研究表明其湿陷特性指标处于一般堆石料常见值范围内;评价堆石料浸水饱和后的表现,不能只看堆石料软化系数的大小,还要考察堆石料饱和抗压强度等力学性能指标.研究成果为充分利用上库库盆开挖料筑坝并降低工程投资提供了科学依据.     

中国混凝土面板堆石坝的近期进展

中国自20世纪80年代中期开始用现代技术修建混凝土面板堆石坝，至2003年年底已建成和在建的已超过110座，其中坝高超过100m的有31座。文章主要介绍近年来混凝土面板堆石坝建设的若干新进展。     

易自燃特厚煤层瓦斯综合治理技术

结合千秋煤矿实际情况，介绍了易自燃特厚煤层瓦斯综合治理技术。经过实践，应用效果良好。     

朱庄煤矿复杂条件下综采工作面不规则开采技术

朱庄煤矿由于受地质条件的限制和采区边界的影响,为提高资源采出率,Ⅲ624工作面布置呈不规则形状.将原设计高档普采工艺,改造使用综采工艺,回采过程中采取边生产边延长输送机、增加支架、回风巷中预留放置支架等措施,克服回采中种种难题工艺难度大问题,取得了较好的经济效益.     

Mechanical analysis on deformation of surrounding rock with road-in packing of gob-side entry retaining in fully-mechanized sub-level caving face

Based on the movement regularity of surrounding rock with road-in packing of gob-side entry retaining in fully-mechanized sub-level caving face (RPGERFCF), the mechanical model of its surrounding rock was established and the calculating formulas of the deformation of the roof, coal wall and filling body were attained. By the mechanical analysis to the deformation of the surrounding rock of RPGERFCF, the major factors influencing the deformation of the surrounding rock were found out and the technologic approaches reduced the deformation and enhanced the stability of the surrounding rock were put forward. Consequently, the scientific bases were provided for the stability control of the surrounding rock of RPGERFCF. Supported by the National Science Foundation of China (50674046); National Science Important Foundation (50634050); Hunan Science Foundation (06JJ50092)     

Grain Size Effects on the Mechanical Behavior of Open‐cell Nickel Foams

The dependence of the mechanical behavior of nickel foams upon their grain size was studied. First, the grain coarsening phenomenon which occurs during the processing of foams was analyzed. A metallurgical characterization of the grain growth during heat treatment was performed. The grain size effects on the mechanical properties was then studied, namely, via the Hall‐Petch law. The foam walls being very thin, roughly 10 μm in thickness, grain growth and mechanical behavior might be different compared with conventional materials. The present results obtained with foams were compared with literature data on bulk pure nickel and with nickel foils of 10 and 50 μm in thickness which are good candidates for the modeling of the cell walls. The EBSD technique allowed observing the absence of preferred crystallographic orientations for both foams and foils. A mechanical model in the spirit of that by Gibson and Ashby was finally presented incorporating the grain size effect on yield strength and hardening modulus. This model provided a good estimation of the experimental data.     

一种多人脸跟踪算法的研究与实现

结合人脸的运动模型提出了一种多人脸的跟踪算法,通过使用跟踪稳定系数来解决多人脸跟踪过程中目标发生粘连重叠或者由于目标检测质量的原因造成跟踪目标丢失等各种问题;同时目标跟踪器提供一个预测搜索区域指导下一帧的定位,从而进一步提高定位的速度.实验结果表明此算法具有很好的准确性和实时性.     

洪家渡水电站面板堆石坝填筑质量控制综述

文章结合洪家渡水电站面板堆石坝填筑施工，介绍了大坝填筑的料源、施工参数、干密度检测等施工质量控制情况，并对面板堆石坝填筑层厚、碾压参数和干密度“双控”等问题提出了看法。     

Two general equations for deriving SIF expressions of some axisymmetric finite domain problems

Using the previous analytical method (Wang QZ, The crack-line (plane) stress field method for estimating SIFs—a review. Engineering Fracture Mechanics 1996; 55(4): 593–603.) and Green's function approach, two general equations are formulated for deriving approximate stress intensity factor (SIF) expressions for two categories of finite domain problems: (1) a finite-width strip with a center crack; (2) a circular cylinder with a concentric penny-shaped crack, both under various axisymmetric tensile loading at the crack faces. Examples with concentrated and distributed (up to quadratic variation) loading conditions are given to show the efficiency of these two general equations. As compared with the previous method, now the necessity of finding out the exact crack-line (plane) stress solution for the counterpart infinite problem is eventually waived. Another merit is that some SIF results for concentrated loading cases derived by using the general equations may have better accuracy than those given by the previous method. These two general equations are almost identical in form except for a small difference. Examples also show that the dimensionless SIF expressions for some problems in category (1) are identical with those in category (2), and there exists a regular correspondence between their loading conditions. Such identities in the dimensionless SIF expressions are useful in applications. Several example solutions given in this paper fill in the vacancy of missing solutions in present SIF handbooks, while other solutions are much simpler than the corresponding solutions in SIF handbooks.     

复杂背景下的人脸分割

针对复杂背景下人脸位置的不确定性和人脸轮廓边缘点的不连续性,本文提出一种新的人脸分割算法,能够在复杂背景下将人脸快速分割出来。本文算法包括三部分:首先设计了特征与模板相结合的人脸定位算法,在复杂背景中以双眼和嘴的坐标为基准确定人脸位置;其次,设计了自适应搜索算法,提取真正的人脸轮廓点,去除“假”轮廓点;最后利用人脸轮廓的平滑性通过曲线拟合来补充不确定轮廓点,完成人脸分割。本文算法综合利用了人脸的肤色、表面结构、轮廓边缘以及轮廓的平滑性等特征完成人脸分割,实验结果证明了算法的有效性。