The leverage effect and the basket-index put spread

Benchmark models that exogenously specify equity dynamics cannot explain the large spread in prices between put options written on individual banks and options written on the bank index during the financial crisis. However, theory requires that asset dynamics be specified exogenously and that endogenously determined equity dynamics exhibit a “leverage effect” that increases put prices by fattening the left tail of the distribution. The leverage effect is larger for puts on individual stocks than for puts on the index, thus increasing the basket-index spread. Time-series and cross-sectional variation in the leverage effect explains option prices well.     

塔里木油田哈得区块标准井及标准井标准工艺流程的构建

为缩短钻井周期、节约钻井成本,塔北项目部率先提出了以标准井及标准工艺流程为经度,以标准化设计、标准化安全管理、标准化工期及费用、标准化质量控制及考核机制为纬度的"五标"管理理念,而标准井及标准工艺流程为构建"五标"管理理念的关键。根据对哈得区块已完钻的直井、水平井、侧钻井、定向井的统计分析,并结合实际生产开发情况,确定了以直井和水平井作为哈得区块标准井的井型;根据标准井产层的各项地层参数,确定了相应标准井的钻头尺寸组合、钻进深度、套管规格、套管下深、泥浆体系、测井等参数,从而构建了哈得区块直井和水平井2种井型的标准井;同时依据各标准井构建了相应标准井的标准工艺流程。通过塔北项目部的生产实践表明,标准井及标准井的标准工艺流程的构建大大有助于提高油田的经济效益和管理效率。     

消费者需求受食品质量与安全影响的讨论分析

近年来,国内经济发展迅速,人们生活水平也得到很大提升,使得人们越来越重视安全,而食品是人们生活中的基本物质保障,是人们生活的必需品,所以食品的质量与安全问题是当下最热门的话题之一。当前消费者的需求会受食品质量与安全的影响,频发的食品质量与安全问题让人们愈发重视食品质量与安全,消费者的需求渐渐发生变化。基于此,本文展开了关于食品质量与安全对消费者需求的影响的研究。     

Short-term scheduling of crude oil operations in refinery with high-fusion-point oil and two transportation pipelines

In some refineries, storage tanks are located at two different sites, one for low-fusion-point crude oil and the other for high one. Two pipelines are used to transport different oil types. Due to the constraints resulting from the high-fusion-point oil transportation, it is challenging to schedule such a system. This work studies the scheduling problem from a control-theoretic perspective. It proposes to use a hybrid Petri net method to model the system. It then finds the schedulability conditions by analysing the dynamic behaviour of the net model. Next, it proposes an efficient scheduling method to minimize the cost of high-fusion-point oil transportation. Finally, it gives a complex industrial case study to show its application.     

Foreign Ownership Restriction and Momentum – Evidence from Emerging Markets

This study investigates the impact of foreign investors on stock price efficiency and return predictability in emerging markets. It finds that stocks fully investible for foreign investors exhibit stronger price momentum than non‐investible stocks. The difference in momentum effects between stocks with different levels of investibility cannot be fully explained by world market risk, size, turnover, or country‐specific factors. Further tests show that fully investible stocks have no post‐earnings‐announcement drift (PEAD), and their short‐term momentum reverses over a longer horizon. These results show that the stronger momentum of highly investible stocks does not appear to be driven by foreign investors' underreaction to firm‐specific information, but is more likely to be generated by their positive feedback trading.     

东莞市产业结构与土地利用结构的相关性研究

经过改革开放后三十多年的发展,东莞市已经成长为典型的劳动密集型的制造业城市。城市在不断地发展,土地资源的有限性与社会经济发展的矛盾日益突出,使得东莞市的产业结构和土地利用结构与改革开放初期时的状态有明显不同。本文通过分析该市2005-2012年间产业结构和土地利用结构的数据及相关性,进一步理清两者之间的关系,并依此提出如何优化东莞市产业结构,提高土地利用效率的建议。     

我国农村劳动力＂反梯度＂流动的经济学分析——以新疆采棉工为例

农村劳动力“反梯度”流动是我国经济和社会转型期间出现的一种特殊现象。从流向看，它有悖于劳动力由乡一城、由落后地区一发达地区流动的规律。文章采用经济学分析方法，以新疆采棉工为研究对象，从理论和现实两个层面研究分析采棉工理性的流动决策行为以及基本特征和相关影响因素。     

基于竞争态模型的安徽省FDI来源地地域结构研究

运用竞争态模型对安徽省外商直接投资(FDI)资金市场2001-2010年统计数据进行深入分析,揭示安徽省FDI资金市场来源地地域结构时空演替规律,研究发现:安徽省FDI资金市场竞争态在时间维度上呈现出"复苏-衰退-跳跃-稳定-衰退"的复杂波动演替态势,空间维度上表现为明星市场缺失,金牛市场稳中有降,瘦狗市场和幼童市场波动较大的特征。据此,提出稳定和拓展安徽FDI资金市场若干针对性策略。     

关于近代中国科学技术落后于西方的几点认识

科学技术史的领军人物英国著名学者李约瑟在对中国科学技术发展史进行研究,并提出疑问由此引起国内外学者的广泛关注。笔者作为科学技术史的一名后来者也想通过自己的学习与心得谈谈这个备受关注的话题,以此希望能得到有关各位前辈的指点。中国古代的科技颇为一流,堪称世界领先,可是到近代却远远落后于欧洲。这不能不令后辈们或是研究者感到惊奇或怪异。本文就是谈谈笔者自己的几点认识,着重谈宗教对中国科技史发展的影响。以此使后人能真正认识这个现状。也使当局者能认识现在面临的状况,改变一些不好的做法,制定切实有效的策略,让我国的科学技术得以快速的发展仅此而已。