CLUSTER OF WORKSTATIONS BASED ON DYNAMIC LOAD BALANCING FOR PARALLEL TREE COMPUTATION DEPTH-FIRST-SEARCH

IntroductionWith the advantages of the high- speed net-works,cluster of workstations achieve the samescalable parallelism as the current MPPs( Massive-ly Parallel Processors) .But there are many factorssuch as load imbalance,synchronization and com-munication that inhibit good performance in thesesystems.These issues are central to the develop-ment of many parallel applications. Load balanceproblem is a serious impediment to achieving goodperformance in parallel processing the issue of load…     

某码头陆域形成地基失稳分析

通过对南方某码头后方回填地基失稳事故及采取的措施进行分析，反推理论计算的指标选取，确定回填过程的加荷速率。对于同类工程的安全控制具有一定的借鉴意义。     

高速列车空气阻力的研究

随着列车运行的提高，列车受到的阻力不断增大，其中空气阻力占的比例越来越大。文中介绍了国外测定列车空气阻力的方法及减少空气阻力的措施。     

工程图和档案在网络上的归档与利用

本文介绍在计算机网络中建立公路工程科技电子档案的做法。     

减振器客户需求层次聚类模型研究

为有效开发产品族,提出基于层次聚类的减振器客户需求分析模型,综合运用定性和定量的方法进行客户需求划分和聚类,确定了产品族设计的功能特征系列型谱和功能特征值系列型谱.用客户需求表示和描述产品,更直观地表达了客户需求与产品模块化规划问的关联,达到用最少的模块和最多的模块组合来满足多样化的客户需求的目的.     

滑移转向装载机设计计算

为使滑移式转向装载机具有更好的使用性能,对其整体设计方案进行了确定,计算了整体参数以及该设计方案下装载机的作用阻力、整机功率、重心位置和稳定性。结果证明：该滑移转向装载机的总体设计参数满足设计要求。     

Experimental investigation into low-velocity water entry of cylinder structure

The process of low-velocity water entry is utilized on a large scale for the military and engineering purposes. However, there are rarely systematic experimental investigations into the low-velocity water entry of cylinder structure for reference. In order to obtain typical phenomena and relevant laws, we design a set of experimental facilities with adjustable parameters and better repeatability to study this process with a high-speed photography system. The influences of cylinder radius, initial velocity and entry angle on the process of lowvelocity water entry are tested. Results show that six typical phases exist in this process: structure submersion,necking, cavity formation, cavity abscission, spray at the free surface and jet formation. Three factors mentioned above are key parameters and influence the process in different degrees, and some laws obtained in this paper have a reasonable agreement with the theoretical results. Our results provide references for the relevant numerical researches and engineering applications.