Which factors affect the duration of hot topics on social media platforms?

Quality & Quantity - Hot topics, as a common phenomenon on social media platform, play a major role in public opinion. This paper aims to discuss the issues about the duration of hot topics:...     

Multimarket Linkages,Trade and the Productivity Puzzle

This paper examines the relationship between firms’ productivity improvement and the volume of exports, and shows that it can be sometimes negative, which seems to be an empirical puzzle. The key lies in that we simultaneously take into account intermediate retailers (i.e. vertically) and multimarket linkages (i.e. horizontally). With convex cost functions, when market conditions worsen, the manufacturer increases supply to the retailer who is larger or more efficient in trade cost.     

Financial investor sentiment and the boom/bust in oil prices during 2003–2008

From both theoretical and policy perspectives, it is important to understand if financial speculation contributes to the boom/bust in oil prices during 2003–2008. In this paper, we disentangle the effects of financial speculation from those of economic fundamentals by focusing on exogenous changes of financial speculation in oil markets identified by changes in financial investor sentiment. Furthermore, we focus on a quasi-experiment setting, and investigate both sentiment-driven overvaluation of oil prices and subsequent mispricing correction. Our findings suggest that financial speculation might have contributed to the 2003–2008 boom/bust in oil prices.     

Variable selection for varying coefficient models with measurement errors

This paper focuses on variable selections for varying coefficient models when some covariates are measured with errors. We present a bias-corrected variable selection procedure by combining basis function approximations with shrinkage estimations. With appropriate selection of the tuning parameters, we establish the consistency of the variable selection procedure, and derive the optimal convergence rate of the regularized estimators. A simulation study and a real data application are undertaken to assess the finite sample performance of the proposed variable selection procedure.     

花土沟油田化学防砂技术研究与应用

分析了花土沟油田油井出砂特征,并根据花土沟油田地层特点制定了合理的防治措施,采用GFY-DMP低聚物进行了化学防砂现场试验,其恢复产能效果明显,防砂有效期长。     

News

Major Export Markets Going Up in Frist Four Months According to Customs Data,the export of textile and clothing accumulated to 70.255 billion USD in first four months,rising 27.05% from the same period last year.     

Man''s Wear Sales Rising 28.92% in First Three Quarters of 2010

According to the statistics of China National Commerce Information Center, the man’s wear sales of major retailers rose 28.92% year over year in first three months of 2010. The growth rate was 5.36 percentage points     

液压与气动课程CDIO教学模式探讨

探讨了基于CDIO理念的液压与气动课程教学模式,包括课程分层次教学方法设计、课程教学内容模块化设计、课程教学效果考核细化设计。通过液压与气动课程CDIO教学模式实践,可以进一步提高课程的教学质量和效果,有利于培养和加强学生的实践能力和综合素质。     

构建高等职业教育教学信息收集体系

本文介绍了西安航空职业技术学院教学信息收集体系的具体操作办法,阐述了建立这一体系对人才培养质量的提高起到了积极作用。