Companies

Net earnings after pre-tax profits. Profiles include: Anadarko Petroleum, Chevron Texaco, Conoco Phillips, Exxon Mobil, Occidental, Schlumberger, YPF SA, EnCana Corporation, Imperial Oil, Petroleo Brasileiro, Total SA, E.ON, ENI, Repsol, Ecopetrol SA, Norsk Hydro, Statoil, Devon Energy Corporation. BP, Shell, BHP Billiton, CNOOC, Sinopec and PetroChina. Updated on a monthly basis.     

铁路冷藏运输运价分析

本文对各种运输方式易腐货物的运价进行了比较分析,对铁路冷藏运输的现行运价和保本运价进行了讨论,提出了铁路冷藏运输运价改革的若干建议,可供铁路进行冷藏运输改革参考。     

大功率UPS的并联控制技术

提出了一种新的N 1三相大功率UPS的并联控制方案，并且在4台40KVA三相在线式UPS上进行了实验研究，实际运行结果证明采用此方法可以获得良好的静态与动态特性。     

Solaris2.X操作系统上NFS的环境配置

本文描述了Ｓｏｌａｒｉｓ２．Ｘ操作系统上网络文件系统ＮＦＳ的特性及其环境配置，介绍了如何建立了ＮＦＳ服务器和ＮＦＳ客户机，从而实现了远程文件系统资源共享。     

住宅厨房共用排烟系统性能比较

介绍了当地住宅厨房通风设计的发展简况，比较了两种房共用排烟系统的构造，尺寸，性能，造价及能耗，对厨房通风设计和施工提出了建议。     

从数字看发展片式电容器面临的机遇与挑战

采用海关进、出口统计和行业生产统计资料,通过计算、分析,用数字来说明国内发展片式多层陶瓷电容器、片式钽电解电容器、片式铝电解电容器、片式有机薄膜电容器所面临的机遇与挑战,并对其国内市场需求总量、额,国产品在国内市场占有率等做出评估,为有关单位了解片式电容器的发展提供参考,为国产产品更有效地进入国内市场、促进其发展提供依据。     

一种在秘密共享中骗子的检测方案

提出了一种能正确确定欺骗者的方案。此方案具有在验证时运算简单、快速的特点。对此方案的攻击如同大数分解一样困难。     

Benchmarking of electricity networks: Practical problems with its use for regulation

Benchmarking is a technique derived for management purposes, intended to identify outliers in any population as possible problems for resolution. Several regulatory agencies have tried to use benchmarking to define the degree of inefficiency of regulated companies, by reference to some target or frontier. This paper identifies the main problem inherent in trying to adapt a management technique to a regulatory purpose – namely that it requires the exercise of subjective judgements. The resulting lack of predictability and objectivity is not conducive to the provision of efficient regulatory incentives.This paper explains where subjective judgement enters into regulatory applications of benchmarking, which is not always apparent. The choice of model and selection of data sets are two obvious areas, but the main problem arises over the assumption that any costs not explained by the model must be due to inefficiency. Such assumptions are simply unsupported by evidence and lead to cost targets (or cost reduction targets defined over several years) that are little better than subjective guesses. There are other, superior ways to set cost reduction targets, based on long-term trends in total factor productivity for the regulated sector, which are used in the US and in other countries. However, some regulators feel obliged to use benchmarking and the paper concludes with recommendations as to how benchmarking should support further and more objective investigations into the costs of regulated utilities.     

基于云计算的多媒体专业教学资源库建设研究

研究了云计算理念下的多媒体专业教学资源库建设方法,对专业教学资源库的组成架构和功能模块进行了阐述,分析了专业教学资源库建设和使用的有效途径,提出了以用户为中心,以需求为导向,以提升用户的学习力和创造力为根本的多媒体专业教学资源库建设思路.     

基于P2P的云计算模型及其安全性分析

文章通过将P2P技术和云计算相结合,提出了一种可靠的、可扩展的、低成本的文件共享模型PA-Cloud。该文介绍了PA-Cloud的文件下载和更新过程,并对系统的安全性进行了分析。通过对PA-Cloud进行对比实验表明,PA-Cloud可以有效提高系统的可扩展性,降低服务提供商的成本。