城市公共自行车系统建设模式研究——基于低碳视域下的实践与比较

城市公共自行车系统的建设模式主要有民营企业建设模式、传统政府采购模式、PPP模式等三种.不同的建设模式会产生不同的实施效果.通过比较研究显示,在建设公共自行车系统的三种主要模式中,PPP模式具有很大优势,它有利于降低企业经营风险,减轻政府负担,保证项目实施效率,促进民营企业的发展.     

中国家具产业对外贸易与技术最优路径分析

中国家具产业遵循比较优势理论,产业规模膨胀,出口额快速增加,成为世界第一家具出口大国。然而,家具产业并没有在"出口学习"中实现自身竞争力的提升,技术能力和创新能力呈现出下降的趋势。文章通过建立中国家具产业动态系统模型并利用最优控制理论,验证家具中技术与对外贸易的相互关系,分析家具产业对外贸易与技术路径形成的原因,并预测在现有模式下的发展趋势。     

Research on a stock-matching trading strategy based on bi-objective optimization

In recent years, with strict domestic financial supervision and other policy-oriented factors, some products are becoming increasingly restricted, including nonstandard products, bank-guaranteed wealth management products, and other products that can provide investors with a more stable income. Pairs trading, a type of stable strategy that has proved efficient in many financial markets worldwide, has become the focus of investors. Based on the traditional Gatev–Goetzmann–Rouwenhorst (GGR, Gatev et al., 2006) strategy, this paper proposes a stock-matching strategy based on bi-objective quadratic programming with quadratic constraints (BQQ) model. Under the condition of ensuring a long-term equilibrium between pairedstock prices, the volatility of stock spreads is increased as much as possible, improving the profitability of the strategy. To verify the effectiveness of the strategy, we use the natural logs of the daily stock market indices in Shanghai. The GGR model and the BQQ model proposed in this paper are back-tested and compared. The results show that the BQQ model can achieve a higher rate of returns.     

Negative Externalities of Rail Noise and Housing Values: Evidence from the Cessation of Railway Operations in Singapore

The governments of Malaysia and Singapore reached a landmark agreement in May 2010 to end the operations of nearly 80‐year‐old railway lines and stations in Singapore. In our study, the cessation of the railway services operated by Keretapi Tanah Malaya (KTM), a firm owned by the Malaysian government, with effect from July 1, 2011 is used in a quasi‐experiment design to test the effects of the removal of train noise externalities on real estate values. Based on the nonlanded private housing transactions data from January 2005 to June 2013, we find that average prices for houses located within a 400‐m boundary from the railway lines increased by 3.5% relative to prices for houses located outside the 400‐m boundary after the cessation agreement has been announced. The removal of train noise externalities increases housing prices in the affected area by 13.7% on average in the postcessation period of the KTM railway services. Realized economic benefits associated with the railway services cessation were estimated at S$0.36 billion based on houses sold in the post cessation period of the KTM railway services.     

论中西体育文化的价值取向

比较中西不同的体育文化价值观,体育文化价值的差异化,决定了体育的国际化和多元化研究的必要性。认识自身的体育文化,理解所接触的多元文化,才能在融合多元文化的奥林匹克运动中确立自身体育文化的位置。通过对中西体育文化基本差异、参赛原则、竞技精神等价值取向进行分析,从多个层面论述不同民族体育文化的基本特征。     

Local impacts of a global crisis: Food price transmission,consumer welfare and poverty in Ghana

This paper takes a local perspective on global food price shocks by analyzing food price transmission between regional markets in Ghana. It also assesses the impacts of food price increases on various household groups. Taking the 2007–2008 global food crisis as an example, we show that prices for domestic grain products are highly correlated with world market prices. This is true both for products for which Ghana is highly import-dependent (e.g., rice) and the products for which Ghana is self-sufficient (e.g., maize). The econometric results also show that price transmission is high between regional producer markets and markets located in the country’s largest cities, and the distance between producer and consumer markets and the size of consumer markets matter in explaining the price transmission. The welfare analysis for households as consumers shows that the effect of world food prices appears relatively modest for the country as a whole due to relatively diverse consumption patterns within country. However, the national average hides important regional differences, both between regions and within different income groups. We find that the poorest of the poor—particularly those living in the urban areas—are hardest hit by high food prices. The negative effect of the food crisis is particularly strong in northern Ghana. The main explanations for this regional variation in the price effect is the different consumption patterns and much lower per capita income levels in the North of Ghana compared to other regions in the country.     

基于市场预期行为下我国货币政策效应分析

本文通过建立基于市场预期下银行间同业拆借利率与债券市场交易利率的时间序列的动态指标体系,对货币政策效应进行了更为深入的量化分析,这种量化是基于市场的真实行为所进行的,并利用其对我国的货币政策效应进行研究,以得出在我国的经济现实下市场预期与政策有效性之间的关系。     

重力式码头胸墙施工质量通病分析与防治

结合某军港重力式码头胸墙的施工情况,分析了码头胸墙的施工质量通病,介绍了质量通病的防治措施。     

基于物元分析的室内环境污染可拓评价

为了客观准确地对室内环境污染进行评价,引入可拓学物元分析理论,建立室内环境污染的评价物元模型,通过计算综合关联度确定室内环境污染评价等级。