石油产品常压馏程的分析测定

常压馏程的测定对石油产品的工艺调整至关重要,本文介绍了NDI 440全自动常压蒸馏仪中各部件的工作原理,列举了此仪器常见故障产生的可能原因及解决方法,最后归纳了实验条件的选取及注意事项。     

中国房地产行业盈余管理模型的构建及实证分析

本文研究中国上市房地产企业的盈余管理行为。本文发现，传统应计制下的盈余管理模型无法较好地拟合中国房地产行业盈余管理的特征。在关注房地产行业经营和财务处理方面特殊之处的基础上，通过详细分析预售制度和会计处理的特点，建立了以预收账款作为被解释变量的预收模型。运用该模型对房地产行业的盈余管理行为进行了检验．其检验效果和拟合优度要优于改进的修正琼斯模型。经过实证检验，认为上市房地产企业利用预收账款，存在微弱的正向盈余操纵。     

一种一维距离像的识别算法

随着高分辨率雷达的发展,一维距离像识别已成为雷达目标识别的重要方法之一.为了消除一维距离像的平移,将一维距离像变换到频域,提取其频谱信息作为识别特征,并依据Fisher判据,将高维特征空间数据降到一维空间,提高了算法的实时性.仿真结果表明这是一种方便有效的识别方法.     

测控通信系统射频资源可重组技术

测控通信系统的资源重组将是飞行器测控通信系统的发展方向。在中频实现测控终端重组的基础上,通过对射频重组构架的分析,得出了射频交换网络的性能和射频远距离传输的性能直接影响射频重组的可行性,提出了一种可行的全系统资源重组的测控体系构架,即采用微光电子射频交换网络与射频光波传输技术实现射频信号大规模交换及远距离传输,再结合中频重组以实现全系统资源重组,并对相关性能进行了分析。所提出的设计思路可供测控通信系统实现全体系的资源重组借鉴及参考。     

The Effectiveness of Technical Trading for Arab Stocks

In this paper, we examine the profitability of technical analysis for a cross section of individual Arab stocks. Our analysis, undertaken from the perspective of an Islamic investor, reveals that technical trading rules do not yield economically or statistically significant returns. While our results uncover some scant statistical evidence of technical trading rule profitability, risk adjusting the returns weakens the evidence in favor of predictability. Furthermore, break-even transaction costs do not exceed estimated transaction costs or bid-ask spreads in the markets examined.     

从陶朱五字商训看阿尔迪的成功

以陶朱五字商训为主线,从五个方面分析了阿尔迪的经商原则,总结出了阿尔迪值得借鉴的成功经验：天,企业经营理念和明确的行为准则;地,商家诚信;人,仁,商家对待内外部的态度和原则;神,开拓事业的勇气和魄力;鬼,经商的手法。     

改进原料气取样方法 提高丙烯含量分析结果平行性

分析了目前原料气罐车三次取样丙烯含量极差较大的问题,阐述了如何改进原料气取样方法,提高丙烯含量分析结果平行性。     

Socially optimal replacement of conventional with electric vehicles for the US household fleet

In this study, a framework is proposed for minimizing the societal cost of replacing gas-powered household passenger cars with battery electric ones (BEVs). The societal cost consists of operational costs of heterogeneous driving patterns' cars, government investments for charging deployment, and monetized environmental externalities. The optimization framework determines the timeframe needed for conventional vehicles to be replaced with BEVs. It also determines the BEVs driving range during the planning timeframe, as well as the density of public chargers deployed on a linear transportation network over time. We leverage data sets that represent US household driving patterns, as well as the automobile and the energy markets, to apply the model. Results indicate that it takes 8 years for 80% of our conventional vehicle sample to be replaced with electric vehicles, under the base case scenario. The socially optimal all-electric driving range is 204 miles, with chargers placed every 172 miles on a linear corridor. All public chargers should be deployed at the beginning of the planning horizon to achieve greater savings over the years. Sensitivity analysis reveals that the timeframe for the socially optimal conversion of 80% of the sample varies from 6 to 12 years. The optimal decision variables are sensitive to battery pack and vehicle body cost, gasoline cost, the discount rate, and conventional vehicles' fuel economy. Faster conventional vehicle replacement is achieved when the gasoline cost increases, electricity cost decreases, and battery packs become cheaper over the years.     

关于吸油烟机的国家标准和IEC标准中一些错误和修订建议

本文指出了现有吸油烟机国家标准和IEC标准中的一些错误和不足之处，并提出了修订建议，可以使吸油烟机检测更符合实际，提高检测精度，提高工作效率。这些改进措施在沈阳“国家日用金属制品质量监督检验中心”经过试验，证明是切实有效的，但如要采纳为标准内容，应作进一步研究。     

一种高分辨雷达目标识别方法

研究了宽带高分辨雷达目标识别问题，基于目标一维距离像，提取目标散射中心特征，并根据该特征设计了简单目标的目标分类器，利用暗室测量得到的缩比模型高分辨回波数据进行识别，结果表明该识别方法具有良好的识别性能。