采煤机行走轮轴承有限元分析

针对采煤机滑动轴承易损坏的问题,通过有限元方法,建立滑动轴承分析模型,得到轴承承载过程中的应力与变形分布趋势,排除了由于机身过重导致滑动轴承损坏的可能。并根据实际的工况与滑动轴承损坏的形式,分析了滑动轴承损坏的原因,为下一步的改进工作提出了方向。     

New empirical evidence on CEE's stock markets integration

The main aim of the study was to explore the integration of CEE’s stock markets (Central, South-East and Baltic) with those of the developed ones (Germany, USA and the UK). Using daily data from 20 October 2000 up to 20 October 2016, the static analysis indicates a long-run cointegration relationship between CEE markets and all three counterparts considered. The dynamic analysis indicates several short-run episodes of cointegration, which are influenced by nondomestic factors. When comparing among the counterparts, one can highlight that the US stock market is less integrated with emerging markets, which could be considered for portfolio diversification. Furthermore, the contagion effect is not rejected, given that the dynamic pairwise correlations are likely to be affected by herding behaviour and significant break dates.     

基于当前中国经济的货币政策

当前中国经济运行中存在固定资产投资增长过快 ,建设规模过大 ;货币发行量和贷款规模增长过快 ;通货膨胀压力增大等问题。本文从货币政策角度出发 ,认为应该确定以物价稳定和经济发展为货币政策目标 ,将货币供应量作为我国当前货币政策的中介指标 ,以传统的三大货币政策为辅 ,以利率和窗口指导为主来控制我国的货币供应量 ,优化贷款结构 ,实现扩大内需政策的结构性调整 ,树立和落实科学的发展观。     

Does the Conditional CAPM Work? Evidence from the Istanbul Stock Exchange

Using a sample of common stocks traded on the Istanbul Stock Exchange from February 1997 to April 2008, we test whether the conditional capital asset pricing model (CAPM) accurately prices assets. In our empirical analysis, we closely follow the methodology introduced in Lewellen and Nagel (2006). Our results show that the conditional CAPM fares no better than the static counterpart in pricing assets. Although market betas do vary significantly over time, the intertemporal variation is not large enough to drive average conditional alphas to zero.     

Central Bank's Retained Profits and Discount Windows: A Bureaucratic Organization's Discretion-Seeking Hypothesis

A recent study using data on seventy-one countries revealed that the central bank's retained profits serve as financial leverage for its discretion to choose the discount window, which tends to confer more benefits to bureaucrats than other monetary instruments. As an extension, we investigate the case of Korea. The Bank of Korea introduced the Profits-Retaining Clause (PRC) in 1962, elucidating two purposes: to reduce the monetary base and to secure credibility. Upon showing that these claims are not quite convincing, we confirm that the PRC probably served bureaucratic interests. In particular, this paper, using time-series data, supports the aforementioned cross-country study.     

基于DEA视窗分析与Malmquist指数的安徽环境效率动态变化研究——以安徽17个城市2004-2009年数据为样本

运用DEA视窗分析模型测度了考虑污染排放约束在内的安徽17个主要城市区域环境效率动态变化趋势，进而利用Malmquist生产率指数的测算及其分解探究安徽环境效率变动原因。得出结论：安徽环境效率区域发展不平衡，但区域差异有所收敛。技术进步制约安徽区域环境效率提升，技术效率成为安徽区域环境效率提升的源泉。     

Equity with Warrants in Private Placements

We examine private equity with warrant (unit) placements and compare them with private equity placements. Firms making unit placements are smaller, younger, riskier, and characterized by higher information asymmetry than equity‐placing firms. Furthermore, unit‐placing firms experience good pre‐placement stock performance; however, their post‐placement performance is poor and worse than that of equity‐placing firms. We also find that very few of the placed warrants are in the money at expiration. Our results are consistent with the window of opportunity hypothesis and the theory that warrants are especially desirable to a clientele of overoptimistic investors.     

完全响应CPFSK的基带预滤波技术

提出用基带预滤波技术改善完全响应连续相位频移键控(CPFSK)信号的综合性能,这一技术在等效Eb/N0增益与信号带宽方面进行了合理折衷.数值分析表明,有两类窗族预滤波方案,当参数β值选择较合适时,能实现包括RC、SRC、HCS在内的几乎所有基带预滤波.这两类窗族分别是Kaiser窗族和幂次窗族基带预滤波.经过计算机仿真,得出4CPFSK和8CPFSK条件下,基带预滤波技术的等效Eb/N0增益与带宽的数值关系.这一关系对基带预滤波技术在工程上的应用具有指导意义.     

山东莱芜铁矿田马庄矿区“天窗”渗漏量研究

本文以均衡理论为基础，采用数理统计方法，通过对马庄矿区１６年间丰水期最大矿坑涌水量与其对应的灰岩地下水水位降资料的研究，知二者为幂指数关系，从二者所建立的回归方程中，反推出马庄矿区的天窗渗漏量，进而推之。天窗的渗漏量主要取决于天窗下伏灰岩的岩溶发育情况和导水性，天窗的渗漏量只占矿坑涌水量的一小部分。对矿区的安全生产形不成威胁。     

Trends in the economic capacity of the Danish fishing fleet, 1996-2002

The Danish fishing industry has gone through a turbulent period of declining catches and modest economic performance. In order to address these concerns, capacity reduction initiatives, mainly through vessel decommissioning, have sought to relieve pressure on fish stocks and improve the profitability of fishing vessels that remain in the fishery. It is the main purpose of this paper to analyse the capacity utilization trends of the four main commercial fleet segments of trawlers, netters, Danish seiners and industrial (fish for reduction) vessels. Annual cost and earnings data (1996-2002) for fishing vessels of the various fleets are applied to three data envelopment analysis models, which evaluate capacity utilization in terms of catch volume, catch revenue and short-run profit. Results suggest that considerable cutbacks in fleet capacity are required, in the range of 30-50%, if full capacity utilization is to be achieved. A preliminary discussion with respect to the impact of fleet capacity reduction initiatives on fleet performance concludes the paper.