功果桥水电站土石过水围堰设计

修筑在大流量、深厚覆盖层河道上的土石过水围堰,过水期间的抗冲刷及整体稳定是设计的难点。文章对围堰设计思路、关键技术问题及其解决措施进行了全面阐述。功果桥水电站围堰无论是过水围堰高度、覆盖层深度、过水流量,还是贫胶凝粗粒料施工规模均处于中国先进水平。围堰经2 a的过流检验,未发生破坏,实现了预期目标。     

汾河水库安全鉴定溢洪道水力学复核计算

对汾河水库溢洪道泄洪能力进行复核计算。通过对堰型和相关参数选取,计算溢洪道泄洪流量与水深关系,得出汾河水库溢洪道满足泄洪要求。     

C51堆栈构成与空间需求分析

C51的堆栈操作和硬件及软件实现密切相关,C程序设计一般隐藏底层实现细节,因此由堆栈引发的错误很难发现,本文从C51堆栈构成、使用的场合出发,详细比对系统堆栈和模拟堆栈的不同,并由此分析了两类堆栈空间的计算方法,为避免堆栈溢出提供参考.     

Optimal coverage of an infrastructure network using sensors with distance-decaying sensing quality

Motivated by recent applications of wireless sensor networks in monitoring infrastructure networks, we address the problem of optimal coverage of infrastructure networks using sensors whose sensing performance decays with distance. We show that this problem can be formulated as a continuous p-median problem on networks. The literature has addressed the discrete p-median problem   on networks and in continuum domains, and the continuous p-median problem in continuum domains extensively. However, in-depth analysis of the continuous p-median problem on networks has been lacking. With the sensing performance model that decays with distance, each sensor covers a region equivalent to its Voronoi partition on the network in terms of the shortest path distance metric. Using Voronoi partitions, we define a directional partial derivative of the coverage metric with respect to a sensor’s location. We then propose a gradient descent algorithm to obtain a locally optimal solution with guaranteed convergence. The quality of an optimal solution depends on the choice of the initial configuration of sensors. We obtain an initial configuration using two approaches: by solving the discrete p-median problem on a lumped   network and by random sampling. We consider two methods of random sampling: uniform sampling and D²-sampling. The first approach with the initial solution of the discrete p-median problem leads to the best coverage performance for large networks, but at the cost of high running time. We also observe that the gradient descent on the initial solution with the D²-sampling method yields a solution that is within at most 7% of the previous solution and with much shorter running time.     

提高活性染料固着率的冷染工艺

冷染工艺是在原有的喷射溢流染色机的工艺基础上，用适合的中温型染料在低温高ｐＨ值下染棉针织物。只要染料选择适当，该工艺可以达到节资降本，减少污染效果。     

大型火电厂溢流灰水处理技术

结合西柏坡发电厂的溢流灰水处理技术，论述了ＢＪ２０复合絮凝剂，助燃剂（聚丙烯酰胺）的最佳配比方案，通过对竖流沉淀池改造为沉淀池地上布置，池壁改我板焊接，减小污泥斗的锥角；底部机械排泥；环形溢流排水改为辐射形多孔排水管；沉淀区加斜管填料等改进措施，提高了社会效益和经济效益。     

“两路法”压井设计与施工

介绍了特殊压井方法——“两路法”的压井原理、适用条件、计算公式及其在赤水地区的应用情况。分析认为，该压井方法可以使用较低密度的泥浆平衡地层压力，避免了强行下钻作业所带来的风险，因而其效果优于“压回法”     

An Buffer Overflow Automatic Detection Method Based on Operation Semantic

1 Buffer Overflow Detection Technology Buffer overflow detection approaches can be dividedinto two categories :static approaches and dynamic ap-proaches[1 ,7 ~9]. Both dynamic approaches , such asStackGuard[2],StackShield[3],and Ref .[6] ,andstaticapproaches,such as ITS4[4], Rats[5],and Refs .[14 ~15] ,have their own disadvantages andli mitations .Dy-namic approaches increase the system operation spend-ing,and could become a service rejected attack easily.This paper presents anapproachto…