浅析新型分子筛材料的性能及检验方法—4A分子筛的标准化

4A分子筛作为一种新型材料,具有很好的吸附、分离、分散等性能,广泛应用于化工、涂料、日化、汽车及现代医学等领域。由于涉及领域较多,新修订的HG／T2524—2010《4A分子筛》标准在使用过程中可能会遇到一些问题。本文对该标准进行了解读与介绍,包括主要技术性能和检验方法,可以帮助各领域标准应用者正确运用标准,以达到预期目的。     

Sources of the great moderation: A time-series analysis of GDP subsectors

Recent work finds evidence that the volatility of the U.S. economy fell dramatically around the first quarter of 1984. We trace the timing of this so-called “Great Moderation” across many subsectors of the economy in order to better understand its root cause. We find that the interest rate sensitive sectors generally experience a much earlier volatility decline than other large sectors of the economy. The changes in Federal Reserve stabilization policies that occurred during the early 1980s support the view that an improved monetary policy played an important role in stabilizing real economic activity. We find only mild evidence that “good luck” was important and little evidence to support the claim that improved inventory management was important.     

居民消费结构升级视野下的企业营销策略

近些年来,居民的消费需求扩张的主要支撑力为消费结构,因此,在我国遭遇金融危机的时刻,为了扩大内需、开启新一轮消费的热点以及保持经济的持续快速增长,研究我国的居民消费结构升级及相关问题具有非常重大的战略意义。文中首先讲述了居民消费结构升级及其内在动因,其次对我国居民的消费结构升级发展趋势进行了论述,最后就国内企业市场营销所存在的问题以及4P+4C的营销策略展开了讨论。     

木糖二级生化废水絮凝机理及条件的研究

文章通过选取几种不同的絮凝剂进行研究,来选出对木糖废水处理效果最佳的絮凝剂及其最佳絮凝条件、最佳去除率。从硫酸铝、三氯化铝、PAC、硫酸铁、硫酸亚铁、三氯化铁中选出PAC和Al2(SO4)3,然后针对这两种絮凝剂,研究确定其最佳絮凝条件及最大去除率。PAC的最佳实验条件为:投加量为1.6 g/L,pH=6,快速搅拌时间为30 s,沉降时间为30 min;Al2(SO4)3的最佳实验条件为:投加量为1 g/L,原水pH=6,快速搅拌时间为90 s,沉降时间为30 min。絮凝效果为:COD去除率分别为82.3%和75.38%,色度去除率都达到了90%以上。     

How effective is European merger control?

This paper applies an intuitive approach based on stock market data to a unique dataset of large concentrations during the period 1990–2002 to assess the effectiveness of European merger control. The basic idea is to relate announcement and decision abnormal returns. Under a set of four maintained assumptions, merger control might be interpreted to be effective if rents accruing due to the increased market power observed around the merger announcement are reversed by the antitrust decision, i.e. if there is a negative relation between announcement and decision abnormal returns. To clearly identify the events' competitive effects, we explicitly control for the market expectation about the outcome of the merger control procedure and run several robustness checks to assess the role of our maintained assumptions. We find that only outright prohibitions completely reverse the rents measured around a merger's announcement. On average, remedies seem to be only partially capable of reverting announcement abnormal returns. Yet they seem to be more effective when applied during the first rather than the second investigation phase and in subsamples where our assumptions are more likely to hold. Moreover, the European Commission appears to learn over time.     

Entry costs, industry structure, and cross-country income and TFP differences

Entry costs vary dramatically across countries. To assess their impact on cross-country differences in output and TFP, we construct a model with endogenous entry and operation decisions by firms. We calibrate the model to match the U.S. distribution of employment and firms by size. Higher entry costs lead to greater misallocation of productive factors and lower TFP and output. In the model, countries in the lowest decile of the entry costs distribution have 1.32 to 1.45 times higher TFP and 1.52 to 1.75 times higher output per worker than countries in the highest decile. As in the data, higher entry costs are associated with lower entry rates and business density.     

Outside versus inside bonds: A Modigliani–Miller type result for liquidity constrained economies

When agents are liquidity constrained, two options exist – sell assets or borrow. We compare the allocations arising in two economies: in one, agents can sell government (outside) bonds and in the other they can borrow by issuing (inside) bonds. All transactions are voluntary, implying no taxation or forced redemption of private debt. We show that any allocation in the economy with inside bonds can be replicated in the economy with outside bonds but that the converse is not true. However, the optimal policy in each economy makes the allocations equivalent.     

长株潭两型社会林业生态建设研究

长株潭两型社会获批给区域生态建设提供了良好契机,林业生态建设是目前生态建设的首要任务,两型社会建设和林业生态建设的最终落脚点是生态文明。目前该区域局部环境状况恶化、森林覆盖率、城市绿化率低于全省平均水平,城市社会发展不可持续。在提出构建环境友好型两型社会的背景下,沿湘江流域和三市结合部布局生态公益林带,加强林业生态建设和都市生态圈建设,对保护湘江水质、改善区域环境、支撑两型社会建设具有重要的战略意义。     

试论五四运动时期马克思主义大众化

五四运动时期马克思主义的广泛传播为中国共产党的成立奠定了坚实的思想和理论基础,为新民主主义革命指明了发展方向。研究五四运动时期马克思主义的传播对于准确认识、把握马克思主义,推动当代马克思主义中国化、大众化、时代化具有重要的意义。从马克思主义大众化的历史源起、历史进程、历史规律的角度来进行研究,是一个不可或缺的视角。以马克思主义大众化的历史源起问题为研究起点,整体审视五四运动时期马克思主义大众化的相关问题,以期对新民主主义革命时期乃至社会主义革命与建设时期、改革开放以来新时期的马克思主义中国化、大众化、时代化有更深刻的理解。