浅层出砂井地层测试工艺探讨与应用

为解决海上油井浅层出砂井中封隔器密封性和座封、出砂控制、排液方式等问题,根据浅层出砂井的地质特征,通过增加管柱重量、优选测试工具及管柱设计、排液方式等测试工艺措施,探讨了螺杆泵排液＋钻铤＋测试阀测试管柱结构的可行性,通过现场应用,该测试工艺在浅层出砂井中具有极强相容性及优越性。     

安塞油田重复压裂地应力变化分析

水力压裂是低渗透油田开发的主要技术手段。油层岩石地应力的大小和方位决定了压裂裂缝的形态,对油田开发井网部署、工艺的选择有重要的意义。通过老油田加密井的岩芯实验,对重复压裂地应力的变化情况进行了分析,为水力压裂再造梳妆打扮裂缝,提高油层动用程度,改善油田开发效果提供了思路。     

FDI、对外贸易与经济增长的协整性研究——以山东省为例

关于利用外资、进出口贸易与经济增长关系的研究一直以来备受关注,但近年来的研究大多致力于两者间关系的独立性研究,其结果往往会使得理论与实证研究的解释力受到影响。对于多个同阶序列变量之间是否存在长期稳定的均衡关系的研究,协整理论具有重要的应用,其既可充分利用信息资源,还有效避免了“伪回归”问题。另外鉴于不同区域问经济发展模式、发展水平的差异性,各经济要素之间的关系也不尽相同,本文采用山东省1984～2007年间24年的统计数据,对该省的外商直接投资、进出口贸易与经济增长之间的相互关系进行了协整性检验和误差修正模型分析,总结得到有关结论：山东省利用外资、进出口贸易与其经济增长之间存在长期均衡关系,但具有区别于其他地区的自身特点。最后,针对山东经济的协调发展提出了若干政策建议。     

Investigating business cycle asymmetry for the G7 countries: Evidence from over a century of data

In this paper we test for asymmetric behaviour of business cycles for the G7 countries, using the entropy-based test for asymmetry suggested by Racine and Maasoumi [Racine, J.S., & Maasoumi, E. (in press-a). A versatile and robust metric entropy test of time-reversibility, and other hypotheses, Journal of Econometrics; Racine, J.S., & Maasoumi, E. (in press-b). A robust entropy based test for asymmetry. Econometric Reviews.]. We find overwhelming evidence of symmetry. In only 14% of the cases, we find some evidence of asymmetric behaviour of GDP and per capita GDP. More importantly, the period marked by the flexible exchange rate regime, over which much of the empirical work for the G7 countries has been conducted, evidence suggests that the two GDP series are symmetric.     

Exogenous and Endogenous Attention and the Convergence of Analysts’ Forecasts

The propensity of the forecasts of sell-side financial analysts to converge (or diverge) is a function of their exogenous and endogenous selective attention and overconfidence. When returns are negative, the endogenous form of selective attention—a static measure of analysts’ goal-driven attention at a particular point in time—has a positive association with convergence. The exogenous form of selective attention—a relatively involuntary dynamic process of exogenous attentional shift driven by external changes in the market over time—is associated with a tendency for forecasts to diverge.     

Panel LM unit root tests with level and trend shifts

This paper considers a Lagrange multiplier (LM) based panel unit root test that allows for heterogeneous structural breaks in both the intercepts and slopes of a series. We note that many popular time series variables are likely to exhibit changing means and/or trends over time. Given that the usual tests will depend on the nuisance parameters indicating the locations of the trend breaks, we adopt a transformation procedure that makes our new panel unit root tests invariant to the nuisance parameters. To illustrate the importance of the power gain provided by our test, we examine the convergence hypothesis using relative ratios of per capita health care expenditures in 20 OECD countries. Our results provide evidence that the convergence hypothesis is supported.     

生物工程大实验课程改革与探讨

生物工程大实验是生物工程专业的一门重要的综合性实验课程,就当前生物工程大实验教学存在的几点问题,从实验内容、实验体系、实验方法、考核方式方面对生物工程大实验进行改革与探讨。     

关于我国农村金融与农业技术进步的实证分析——基于时间序列数据的研究

金融发展通过＂资本积累＂和＂技术进步＂两条途径来实现对经济增长的影响,技术进步才是决定长期经济增长的关键因素。判断（农村）金融能否可持续发展的标准应该是其能否促进（农业）技术进步。基于1985-2005年的时间序列数据的实证分析,认为我国农村金融发展与农业技术进步之间存在着长期的、均衡的、单向因果关系,即农业技术进步对农村金融发展有着推动作用,而农村金融发展对我国农业技术进步的作用不明显。因此,我国农村金融深化改革应该以促进农业技术进步为导向,以实现农村金融资源的优化配置。     

A Hausman-type test to detect the presence of influential outliers in regression analysis

In regression analysis, classical estimations may be excessively influenced by a few atypical observations. We propose a Hausman-type test to balance robustness and efficiency and to check whether a robust method should be implemented. An economic application is presented.     

我国商业银行流动性与外汇储备的协整性分析

以商业银行流动性和外汇储备之间的关系为研究对象,运用相关计量方法,证明了外汇储备是商业银行流动性的格兰杰原因。国有商业银行流动性过剩在很大程度上源于外汇储备的增长,并且商业银行流动性与外汇储备之间存在着比较稳定的长期均衡关系。