一种新颖的应用于光伏发电系统中超级电容器的充电控制方案

本文描述了一种新颖的适用于光伏发电系统中的超级电容器的充电控制方案,此方案主要由三种模式构成,即恒电流充电模式(CCCM)、恒功率充电模式(CPCM)和恒电压充电模式(CVCM)。在对超级电容器充电的过程中,通过三种充电模式的切转换来实现更有效地利用太阳能电池发出的电能。另外,本文中还将普通的串限流电阻的充电方法及先恒流后恒压的充电方法进行仿真比较,以证明所提出的充电控制方案的优势。     

强化应急管理 为企业实施国际化战略保驾护航

2008年11月,中国石油天然气集团公司应急协调办公室组织考察小组对挪威国家石油海德鲁公司、挪威联合搜救中心、国际SOS组织、英国化险咨询公司的应急管理工作、预案体系建设、应急指挥场所和平台建设等情况进行了调研考察.在考察中,感受到应急工作受到越来越多的关注和重视,所考察企业应急组织体系完善、现代化程度较高,并依靠先进的技术和装备不断提高应急处置和救援能力,同时还注重提高应急预案的实用性和基层员工的应急综合能力.为此,建议我国石油企业在应急管理工作中,加强应急平台的功能化建设,完善应急组织体系、预案体系建设,加强应急物资装备管理,加强应急专家和救援队伍建设,加强与国际专业化公司的业务合作与交流.     

解读2008年全球最大承包商

以2009年ENR公布的225家全球最大承包商排名为基础,首先从合同额、业务领域分布以及区域分布等三方面出发分析了全球最大承包商的总体情况,以及225强中33家中国公司的逐年排名及业务隋况,然后结合往年ENR公布的数据资料,从逐年的排名以及业务领域营业额等方面分析了近五年来最大承包商前十强以及中国公司的变化情况。     

Scientific and Commercial Incentives in R&D: Research versus Development?

This paper proposes a framework to analyze the effects of scientific and commercial incentives in R&D organizations. We build a simple repeated model of a researcher capable of obtaining innovative ideas. Although they reduce the time spent on research, we show that commercialization incentives also affect the choice of research projects. Commercial rewards induce a more intensive search for (ex post) path-breaking innovations, which are more likely to be generated through (ex ante) riskier research programs. We derive the organization's optimal incentive scheme in terms of the researcher's characteristics. We show that organizations should use a high level of commercial incentives for scientists who have strong or weak intrinsic preferences for research. For those with strong preferences, the organization needs to induce development, whereas for those with weak ones, it needs to induce effort.     

Management and employee involvement in achieving an environmental action-based competitive advantage: an empirical study

The objective of this work is to conduct an empirical study that shows whether certain management and human resource factors influence the achievement of an environmental action-based competitive advantage in a company. To this end, we have taken a sample of 110 factories. Management's deep involvement and its strategic integration, as well as employee motivation and participation, have a positive impact on the achievement of an environmental action-based competitive advantage in a company.     

企业社会责任与财务绩效的关联性研究综述

企业社会责任与财务绩效的关联性是国内外研究的一个热点问题。论文运用文献研究法对国内外企业社会责任与财务绩效相关研究进行了详细梳理,对二者相关性的研究结论进行了分类总结;同时分析了企业社会责任与财务绩效关联性研究结论不一致的原因,并为后续研究提出了建议。     

Interpretation problems of the partial correlation with nonnormally distributed variables

The partial correlation is a commonly used measure for assessing the bivariate correlation of two quantitative variables after eliminating the influence of one or more other variables. The partial correlation is generally interpreted as the correlation that would result if the variables to be eliminated were fixed (not allowed to vary and influence the other variables), which is referred to in the statistical literature as conditional correlation. The present paper demonstrates, by means of theoretical derivations and practical examples, that when the assumption of multivariate normality is violated (e.g., as a result of nonlinear relationships among the variables investigated) the usual interpretation of the partial correlation coefficient will be basically incorrect. In extreme cases the value of the partial correlation coefficient may be strongly positive, close to 1, whereas the conditional correlation may have a large negative value. To solve this problem the paper suggests to partial out a certain function (in most cases the square) of the variables whose effects are to be eliminated if nonlinear relationships are likely to occur.     

基于Z-Score模型的我国房地产业上市公司财务风险的实证分析

在宏观经济紧缩和严厉调控政策的影响下,我国房地产企业已经出现了显著的财务风险。本文运用Z-Score财务风险预警模型,对在深市A股上市的61家房地产企业财务风险进行了实证研究,并在此基础上针对性地提出了房地产企业加强财务管理和风险防范的建议。     

国内外上市公司内部控制信息披露的比较研究

本文对美国、英国等国家的内部控制信息披露进行了梳理和比较,对中国内部控制信息的披露提出了政策建议。