Key Techniques for the Development of Web-Based PDM System

Productdatamanagement(PDM)systemisan effectiveframeworkinmanufacturingindustryto manageproductdefinition,controlandimproveprod uctdevelopmentprocess,andintegratedifferentap plications,whichcanalsobeusedtoachievethegoals ofknowledgemanagement,knowledgereuse,and productinnovation[1-6].APDMsystem—BITPDM hasbeendevelopedinBeijingInstituteofTechnology underthefoundationandcooperationwithmanufac turingindustry.BITPDMsystemisdevelopedonMi crosoft.NETplatform,adoptingtheweb basedarchi tectur…     

基于EDK的高速数据收发嵌入式用户IP核设计

介绍了基于FPGA嵌入式系统的多通道高速数据收发模块的用户IP核设计。在Xilinx公司的ISE开发工具中,用FPGA器件中的硬核RocketIO及软核FIFO设计用户逻辑;使用嵌入式开发工具EDK封装成可在FPGA嵌入式系统中使用的用户自定义IP核,最后通过实际测试验证了该方法的实效性。     

综合业务配置平台(iSPP)的研究

本文主要介绍了iSPP的产生背景、主要功能及其关键技术,并结合iSPP目前的应用情况展望未来的发展趋势。     

An object-oriented reference model of the fuzzy front end of the new product introduction process

The global pressures of the modern market are placing an ever-increasing emphasis on the rapid development and introduction of new products. Central to this aim is the implementation of an effective business process for managing and controlling product innovation. Research has shown that the front end stages of the so-called new product introduction (NPI) process are weakest in a high proportion of companies and direct support is needed in this area. This paper describes how an object-oriented methodology has been applied to develop a reference model and architecture to facilitate the re-engineering and implementation of a high quality business process and help remove the fuzziness of the critical early stages of NPI. The results from the application and testing of this tool within a wide range of different companies are summarised and used to help derive conclusions regarding the validity of the research.     

浅谈中国不锈钢产业的现状及可持续发展

本文阐述了中国不锈钢产业的现状．及200系不锈钢产品的市场前景的基础上．问题。并在分析了镍价对不锈钢产业的影响以提出了我国不锈钢产业发展存在的主要     

利用奇异值分解的鲁棒盲信源分离

利用Amari等提出的估计函数分析了在最小化非线性主分量标准的意义上分离矩阵的最优解,将其描述为归一化的输入与非线性输出的互相关,提出了一种采用奇异值分解的鲁棒盲信源分离方法．该方法将分离矩阵的估计解释为一种非线性的能量迭代问题．在求解过程中对能量项进行了奇异值分解,从而避免了归一化矩阵的求逆以及计算平方根问题,减小了运算量．由于使用了能量项的正定逆平方根来归一化分离矩阵,因此提高了算法的鲁棒性,并且在每一步迭代中都能使分离矩阵保持正交．实验仿真验证了算法的性能．     

Reservoir characterization utilizing core and wire line logging data for Kareem sandstone,Ashrafi oil Field,Gulf of Suez,Egypt

This study aims to integrate core and wire line logging data for evaluation of Kareem sandstone (Middle Miocene) in Ashrafi Field, Gulf of Suez, Egypt. The study has been carried out on seven wells ASHRAFI_A_01_ST, ASHRAFI_A_02_ST, ASHRAFI_H_IX_ST2, ASHRAFI_I_1X_ST, ASHRAFI_K_1X, ASHRAFI_SW_04, ASHRAFI_SW_06, by using wire line logging data and core data. The interpretation of these data has been done by using Interactive Petrophysics software.The Net pay thickness ranges between 17?ft to about 110?ft, porosity varies from 13% to 26%, permeability from 125?mD to about 960?mD, water saturation from 19% to about 50% and shale content from about 18% to about 56%. The interpretation of the Kareem sandstone (core data for ASHRAFI_SW_04 well) indicates that the average core porosity value is about 17% and the average core permeability is about 800?mD, which indicate a suitable reservoir. The porosity increases with the increasing of the permeability and the relationship between them has good correlation coefficient of 0.81 for wire line logging data set and 0.85 for core data set. These relations can be used to determine permeability from porosity for sandstone of Kareem Formation.The new development area for Ashrafi Field can be determined where there are two zones: one in the Middle and the other in South west. Stratigraphic correlation chart shows that, the Kareem Formation thickness varies laterally in Ashrafi field so, the new well location could be determined perfectly. The integration between well logging data and core data are very important tools to evaluate the degree of heterogeneity in the Kareem sandstone and storage capacity properties as well as the zone of interest of productivity and perforation.     

Enhancement of the liquid feed distribution in gas solid fluidised beds by non‐mechanically induced nozzle pulsations

The effect of non‐mechanically induced nozzle pulsations was investigated in the current work, and it was found that appropriately tailored spray nozzles pulsations resulted in the dramatic improvement of the liquid feed spray distribution on particles of a fluidised bed. Non‐mechanically induced pulsations were imposed on the liquid spray, using liquid and gas circuits that favour the development of beneficial pulsations. The resulting effect on liquid dispersion on the fluidised bed particles was determined with a conductance method. © 2013 Canadian Society for Chemical Engineering     

基于MPMC的高性能DMA控制器的设计

依据ATA6协议,在FPGA上设计对IDE硬盘的控制模块,同时使用Xilinx的多端口内存控制器MPMC IP核,实现能够访问外部DDR2_SDRAM的NPI接口控制器,在此基础上,利用嵌入式FPGA开发环境,设计顶层控制IP核,完成硬盘控制器与NPI接口的有效衔接,在MicroBlaze的控制下,数据在硬盘与DDR2_SDRAM之间直接高速传输,实现了高性能DMA控制器的功能,从而提高了主机CPU利用率。设计在Xilinx的XUPV5_LX110T 开发平台得到了验证。     

P≠NP假设下NP-NPC-P中自然问题的一个候选者

1975年,Lander证明在P≠NP假设下存在一个语言属于NP-NPC-P(NPI).但Lander给出语言并不是一个自然的语言因在该语言的构造中需运行所有多项式时间的图灵机.迄今为止,还没有自然的语言被证明在P≠NP假设下属于NPI,并且在P≠NP假设下寻找一个属于NPI的自然语言是一个重要的未解决问题.作者部分解决了此长期未解决的问题.定义了2+f(m)-HAST模型.基于该模型,给出了在P≠NP假设下NP-NPC-P中自然问题的一个候选者.已证明在P≠NP假设下它不属于NPC并且在更强但合理的假设下它的确属于NPI.