一种沉性饵料的饵料台装置

本实用新型公开了一种沉性饵料的饵料台装置，它包括底台、挡板和支架，所述的底台与挡板均为塑料布材料制成，挡板与底台的塑料布缝合，挡板与底台的一个短边完全缝合，与相邻的两个长边各缝合一半，底台的塑料布固定在四根支架上，四根支架包括两对长短不同的支架，无挡板一端的底台塑料布固定在短支架顶端，另一端将挡板与底台塑料布固定在长支架上，并使挡板位于底台塑料布上部。通过提供一种有效的人工养殖水体投喂沉性饵料的饵料台，便于观察吃食情况和降低残饵量，消除饵料沉积污染底质，提高饵料利用率并降低对养殖水体的影响。</p

一种实验用的甲壳类生物养殖装置

一种实验用的甲壳类生物养殖装置，包括缸体，缸体由锥形底部和圆柱主体组成，锥形底部和圆柱主体之间用活动底板隔开，活动底板上设有多个过滤孔，所述活动底板上过圆心、沿竖直方向至少设有一块隔板，隔板上左右水平对称开有多排通孔，所述圆柱主体上部连接有进水管，进水管左右管壁上设有多个出水孔，圆柱主体下部外设有出水龙头。本实用新型提供的一种实验用的甲壳类生物养殖装置，通过在缸体内设置活动底板、隔板、进水管及出水龙头，一方面为甲壳类生物提供了一个良好的生活环境，另一方面由于该装置部分结构可拆卸，可同时为鱼类养殖实验所用，提高了实验装置的利用率和灵活性。</p

项目投资的评估方法与参数体系研究

学位：经济学硕士院系专业：经济学院计划统计系_统计学学号：YL000037

new consideration on the evaluation model of cluster area network

传统集群网络(cluster area network,简称cLAN)的评测模型主要考虑了延迟、带宽、路由、拥塞、网络拓扑结构等因素.但这些因素是否足以描述实际应用程序在集群上的通信行为,或者对其在集群系统上的性能给出一个很好的预测呢?当对NAS Parallel Benchmark(2.4版本)在集群系统深腾1800(DeepComp 1800)上进行大量测试时发现,集群网络的通信性能可以被一种特殊的通信模式(LU模式)所严重影响.更深入的研究表明,这个影响LU模式的因素是独立于前面所述的如延迟、带宽、路由、拥塞、网络拓扑结构等因素的.因此有必要对集群网络的评测模型重新进行审视,并增加一个新的性能评测因子以反映这个新发现的现象.从研究结果来看,这个重新审视也将对集群系统上的并行算法设计以及实际大规模科学计算的应用程序性能的优化提供一些新的思路

review and perspectives of 10 yearschina hpc top100

本文根据中国高性能计算机TOP100排行榜十年发布的数据,对国内高性能计算机的发展历史和现状从总体性能、制造商、行业领域等方面进行了深入分析和回顾。论述了继续采用Linpack测试标准的合理性,探讨了增加系统Linpack测试成功率作为系统可靠性度量指标的可行性,重申了执行中国HPC TOP100申报和检验流程等规定的重要性。After 10yearsdevelopment,the China HPC TOP100rank list has become the de facto industry standard on ranking the fastest supercomputers in mainland China.Prof.Yunquan Zhang, etc.,from the Institute of Software,CAS,give a detailed analysis and review on the performance,manufacturer,and application area development of 10yearsChina HPC TOP100rank list.They discuss the reasonability on continually adopting the Linpack as a benchmarking standard,the possibility of adding the success rate of Linpack benchmarking as the reliability metric of supercomputing systems,and the importance of the rules on applying and verifying the submitted benchmarking results of HPC TOP100

state-of-art analysis and perspectives of 2012 china hpc

本文根据2012年11月发布的中国高性能计算机TOP100排行榜的数据,对国内高性能计算机的发展现状从总体性能、制造商、行业领域等方面进行了深入分析.我们发现,中国TOP100的平均Linpack性能与国际TOP500的平均Linpack性能的差距已经从原来的半年扩大到一年.在此基础上,根据十一届排行榜积累的性能数据和能够得到的其他公开历史数据,对未来几年中国大陆高性能计算机的发展趋势进行了分析预测.从预测可以看出,峰值为10 Petaflops的机器将在2012年到2013年间出现；累计Linpack性能将在2013年到2014年间达到100 Petaflops；峰值为100 Petaflops的机器将在2014年到2015年间出现；峰值达到Exaflops级的机器将在2017年到2018年间出现.国家863计划资助项目(2006AA01A105)In this paper, we first introduce the background of SAMSS China HPC TOP100 rank list. Then we give the total performance trend of China HPC TOP100 and TOP10 of 2012. Followed with this, the performance, manufacturer, and application area of 2012 China HPC TOP100 are analyzed in detail. We found out that the average Linpack performance gap between China TOP100 and TOP500 has increased from half year to one year around. Based on public available historical data and TOP100 supercomputers peak performance data from 1993 to 2012 in China mainland, we predict the future performance trend of China HPC TOP100. We found out that supercomputer with 10Petaflops peak performance will appear between 2012 and 2013, total Linpack performance of China HPC TOP100 rank list will be over 100Petaflops between 2013 and 2014, supercomputer with 100Petaflops peak performance will appear between 2014 and 2015 and supercomputer with Exaflops peak performance will appear between 2017 and 2018

State of the art analysis of China HPC 2013 and system benchmarking technology

根据2013年11月发布的中国高性能计算机性能TOP100排行榜的数据,对国内高性能计算机的发展现状从总体性能、制造商、行业领域等方面进行了深入分析.同时,对高性能计算机系统的测评技术,尤其是对用作排行榜性能测试的Linpack和国内外最近关注的HPCG两个软件包进行了简要分析.According to the latest China HPC TOP100 rank list released by SAMSS in the early November, the state of the art of China high performance computers is under in-depth analysis in terms of the total performance, the manufacturers, the application area, etc. Besides, the benchmarking technology for HPC systems, especially Linpack and HPCG, is analyzed in brief

Mesoscale analysis of the suction stress characteristic curve for unsaturated granular materials

There is still no theoretical framework accounting for linkage between seepage and deformation of unsaturated granular materials. Using a mesoscale liquid bridge model, we propose the first approach for deriving the suction stress characteristic curve (SSCC). Then, we verify the method by obtaining both the soil -water characteristic curve and SSCC for cubic and tetrahedral granular packing. The approach is further validated by generating the SSCCs of granular packings with different particle size distributions. On this basis, a new two -parameter model is suggested that satisfactorily predicts the SSCCs of various real granular materials. The nonlinear variation of strength versus suction is also properly described by a new formula for three kinds of soil. We believe that this SSCC model can help resolve solid -fluid coupling in seepage and deformation problems in unsaturated granular engineering. (C) 2020 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved

performance analysis of npb benchmark on domestic tera-scale cluster systems

对3个国产万亿次机群系统进行了NPB性能测试分析,重点研究大规模并行处理时(处理器数目达到上千个)的性能特点和趋势.分析了不同的处理器、互连网络等系统配置对NPB性能的影响,发现NPB的8个程序在3个万亿次机器上的性能特点和表现并不一致,表明国产高性能机群在设计上正在逐渐走出同质化的趋势,向多样化发展.进一步分析表明,目前NPB程序的可扩展性可以达到几百个处理器,但尚不能达到上千个处理器,NPB程序能发挥出的系统峰值的百分比仍然徘徊在10%左右,机群系统的并行可扩展性和应用程序对机器运算潜能的利用还需要进一步提高.对于处理器数目达到上千个的万亿次机群系统来说,对集合通信和细粒度通信能力的支持亟需提高