SOA应用平台 新一代的基础中间件

介绍了从事企业应用软件开发的建设者们面临的众多挑战,通过采用SOA的架构、理论与方法指导企业应用软件的建设,加强企业软件的可管控能力,可以实现高效的管控和治理能力,快速响应新的业务需求,开放的集成能力,保护已有的软件投资.     

多通道EOPDH/EOS网桥芯片的FPGA设计

本文介绍了一种EOPDH/EOS网桥芯片的FPGA设计,具体说明了本网桥芯片的FPGA电路设计。将许多复杂的功能集中在FPGA上实现,既可以使得设计目标快速产品化,并可以根据市场要求的变化及时修改电路设计,大大体现出了采用FPGA设计的及时性和灵活性。本设计最终采用了XilinxSpartan-6得以验证实现。     

金属合金LBE全局物态方程的初步研究

基于单质全局物态方程模型QEOS(Quotidian equation of state),通过求解平均原子模型的混合物Thomas-Fermi方程以及将混合元素平均为单一虚拟元素的方法得到了混合物状态方程。对铅铋混合物LBE的物态方程做了初步研究,计算了LBE在给定温度与密度下的压强、电离度等,并分析了电离平衡和不同温度、密度下电子及离子对总压强的贡献。     

Till which pressures the fluid phase EOS models might stay reliable?

This paper examines the performance of three fluid phase equations of state in predicting the available very high-pressure data of n-pentane, n-hexane, cyclohexane, toluene, dichloromethane, chloroform and methanol. It is assumed that the key for success at such pressures is establishing the appropriate interrelation between the densities of saturated liquids and the imaginary infinity pressure states. The recently proposed EOS that combines SAFT with the cohesive term of cubic EOS (SAFT + Cubic) most likely satisfies this criterion. According to this model, the saturated liquid densities at T_r = 0.4 are approximately 2.1 ± 0.1 times smaller than the densities predicted at the infinity pressure. With this ratio SAFT + Cubic yields reliable density estimations as far as the substances remain liquid (stable or metastable) in all the considered cases. Its pressure limit for accurate predictions of the auxiliary properties such as sound velocities and bulk moduli appear to be lower, typically around 1 GPa.     

Predicting Volumetric and Transport Properties of Sour Gases and Gas Condensates Using EOSs,Corresponding State Models,and Empirical Correlations

Abstract

Compressibility, density, and viscosity of natural gases are necessary in most petroleum engineering calculations. Some of these calculations are gas metering, gas compression, design of processing units, and design of pipeline and surface facilities. Properties of natural gases are also important in calculation of gas flow rate through reservoir rock, material balance calculations, and evaluation of gas reserves. Usually the gas properties are measured in laboratory. Occasionally, experimental data become unavailable and these properties are estimated from equations of state, corresponding state models or empirical correlations. This article presents the results of using various equations of state, corresponding state methods, and correlations to predict the volumetric and transport properties of sour gases and gas condensates. Capabilities of PR-EOS, SRK-EOS, and PT-EOS to predict gas compressibility and density of 2100 gas samples under various schemes of binary interaction number are thoroughly investigated. This study also reports a comparison between recently developed EOS-based viscosity models and other methods to estimate the viscosity of highly sour gases and rich gas condensates.     

A New Modified Compositional Viscosity Model for Medium-heavy Oils

Viscosity of heavy oils is a key parameter in designing potential enhanced oil recovery methods. The recently proposed semiempirical viscosity model by Lindeloff et al. (2004) Lindeloff, N., Pedersen, K. S., Rønningsen, H. P. and Milter, J. 2004. The corresponding states viscosity model applied to heavy oil systems.. J. Can. Pet. Technol., 43: 47–53. [Web of Science ®] , [Google Scholar] was studied in depth. This model is the simplest yet powerful tool for medium-heavy oil viscosities. Based on the analysis, appropriate adjustments have been suggested, with the major one being the division of the pressure-viscosity profile into three different regions. New modifications have improved the overall fit, including the saturated viscosities at low pressures. The %AAD for the data sets studied was found to be 1.37. However, with the limited geographically diverse data, it is not possible to make a comprehensive predictive model. A few limitations of the new model are also stated.     

天津市电力公司供电营业网点网络设计与实施

结合实例,将传统的TDM语音数据业务和新兴的IP业务综合接入并汇聚到SDH上进行传输,提供了灵活的组网模式.     

自动交换光网络设备中EOS的设计与实现

本文围绕自动交换光网络设备中以太网业务的运用与实现展开,首先简要说明了应用背景,接着介绍了EOS的关键技术．然后分析了自动交换光网络设备中,以太网业务的设计与实现过程。     

EOS中透明传输问题分析及解决方案

在SDH网络上传送以太网业务(EOS,Ethernet over SDH)具有巨大的优势。EOS能利用现有的SDH网络为以太网业务传送提供完善的OAM性能。在EOS系统中,透明传输以太网业务有非常重要的作用。本文详细分析了时钟、故障传递、流量控制和自协商相关的透明传输问题,相应的解决方案也同时提出。     

EOS系统中的网络保护与恢复

在既有SDH系统上进行Ethernet包传输是目前宽带接入系统研究的热门主题之一。本文重点探讨EOS系统中有关于网络保护与恢复的一些问题。