泛珠三角经济差异的时空演进和影响因素探析

泛珠三角是横跨东中西部,包含沿海发达地区和内地欠发达地区的经济合作区。探析泛珠区域内经济发展差异的时空演变格局,并利用空间计量方法对影响泛珠地区经济发展的因素进行实证研究。结果表明:泛珠三角地区以沿海城市群和内陆各省会城市为中心的中心-边缘结构分布显著;区域内空间自相关趋势在加强,空间集聚现象显著;从时间和空间维度上都表明内部经济差异在缩小,区域合作取得一定效果;人均GDP总体空间格局稳定,局域内发生演变,人均GDP增长速度的冷热点区域变化较为明显。空间计量表明,工业化对区域经济发展影响显著,城镇化是促进经济增长的重要途径,城镇劳动人口没能充分发挥作用,表现出城镇就业人口的规模不经济。     

The relation among self-efficacy,learning approaches,and academic performance: an exploratory study

Self-efficacy influences students’ activities, effort and persistence, and it can help predict their motivation and academic performance. This study attempts to investigate the relationship between self-efficacy, preferred learning methods, and academic performance under different learning methods in a unique hospitality course setting. The results indicate that hospitality management students prefer a “learn by doing” approach instead of computer-based learning and lecturing. This study concludes that self-efficacy affects the academic performance in both lecturing and practical learning in hospitality education. However, students’ preference in terms of learning methods does not influence their academic performance. Emphasizing “learn by doing” in the hospitality higher education curriculum is recommended in addition to recruiting faculty members with extensive industry experience. Conversely, it is recommended that faculty find the means to increase students’ self-efficacy when adopting different teaching approaches.     

银行业与证券业间风险外溢效应研究——基于CoVaR模型的分析

此次金融危机表明,混业经营领域是金融风险管理或监管的重点领域,也是金融风险监管的难点.混业经营不可避免地使得不同金融行业存在的潜在风险交叉传染.风险价值(VaR)模型很难捕获金融市场之间的风险的传递,从而在测量市场极端情形时存在较多弊病,容易导致金融市场风险水平低估;而CoVaR很好地弥补了这个缺陷.本文通过分位数回归方法,将CoVaR方法应用于测量单个金融市场所发生的极端风险对其他金融市场风险外溢的方向和大小.结合模型结果,我们得出结论,CoVaR方法可以有效地计量行业之间或金融机构之间的风险外溢效应,并有利于金融集团或金融监管当局及时有效地跟踪行业内(或集团内)系统性风险的变化.     

中国主要贵金属资源利用及关键性评估

贵金属资源同时具备工业属性和金融属性,不仅关系着国民经济的发展,更关系着国家的金融安全和国防安全。中国经济的发展带动了矿产资源需求的增加,对贵金属的需求量也是全球之最。本文参照欧盟的关键性矩阵研究,从经济重要性和供应风险两个维度,对金、银、铂、钯4种贵金属的供应风险开展研究,得到了中国贵金属的关键性矩阵,综合来看,4种贵金属的经济重要性由大到小的顺序为金>银>铂> 钯,供应风险由大到小的顺序为银>钯>铂>金。     

我国科技产业发展的多方融资问题研究

推进我国科技产业发展,必须着力解决科技产业的融资问题.在增加各级财政投入、扩大企业自筹资金的基础上,采取各种方式,完善、扩展科技产业融资渠道.建立风险补偿机制,完善各项政策,加强法律法规建设,从而营造科技产业融资的良好环境.     

ARIMA计量技术下河南省农民增收的预测模型研究

笔者根据河南省1978年～2005年的农民人均纯收入统计数据,将这些数据进行平稳化、零均值化处理,并利用时间序列的自相关函数,偏自相关函数的性质,确认数据所适合的模型.通过对样本数据所做的回归拟合模型定量分析,从而为河南省"十一·五"规划提供量化指标依据.     

基于遗传算法的供应链分销网络模型及其求解

本文研究了由多个厂商、多个分销中心和零售商组成的供应链分销网络,建立了综合考虑库存成本、订货成本和运输成本的分销网络优化模型。该模型是一个整数规划问题,采用遗传算法,并建立一个有效的编码方式来进行快速求解。最后通过一个实例验证了该模型的有效性和实用性。     

制度创新与我国转型期的经济增长

新制度经济学提出,在缺乏有效制度的领域或地区,或者一国处在新旧体制转轨时期,制度效率是最高的。同时,在制度创新过程中,经济增长率也较高。我国多年来的改革充分说明,制度可以对经济增长产生巨大的促进或阻碍作用。在转型经济这个大背景下,我国迫切需要在新形式和以前经验基础上,继续坚持制度创新,促进经济的持续增长。     

Corporate Risk Management under Information Asymmetry

This paper examines the financial and operational hedging activities of US pharmaceutical and biotech firms that are subject to a high level of information asymmetry stemming from R&D investments during 2001–2006. We find evidence in support of the information asymmetry hypothesis à la Froot, Scharfstein and Stein (1993) that hedging helps mitigate the under‐investment problem. Specifically, we find that the use of financial derivatives is associated with greater firm value and that the value enhancement is larger for firms subject to greater information asymmetry and better growth opportunities. There is a synergy between financial hedging and operational hedging where the latter is used to counter product development risk. The results are robust with respect to alternative performance measures, industry‐specific growth measures, and the endogeneity problem. Our work is differentiated from existing studies that examined commodity‐based industries without addressing information asymmetry.     

辗辊式井下采油筛管的研制及应用

针对油田在用井下采油筛管防砂过程中出现的砂堵等问题,依据能量转换原理,研制出一种辗辊式井下采油筛管。辗辊式筛管既防砂又不发生砂堵,还具有穿透性和节能效果明显等特点,不仅可用于一般的采油井、含砂量大和压裂的井,还可用于污水泵的保护。