“绿色南京”林业工程建设生态效益评价

以"绿色南京"林业工程建设新增林为研究对象,监测了新增林的部分生态效益指标。结果表明:林地在净化空气(吸收NO2、SO2和总悬浮颗粒物)、改善小气候(降温增湿、降低风速)、保护生物多样性(植物和土壤生物多样性)等方面均有明显的促进作用。进一步对其生态服务价值进行了统计分析,计算出"绿色南京"林业工程实施10年来(2002.9～2012.9),新增林产生的生态效益总价值为351.15亿元,平均35亿元/年。其中,净化空气微生物价值最大,为81.29亿元,其次为生物多样性保护价值,为71.11亿元。     

后危机时代下银行业对外开放的制度变革与模式选择

美国银行业在金融危机中遭受了严重的损失,全球经济复苏之路缓慢前行,在这样的时代背景下如何选择适合我国银行业对外开放的模式,如何采取合理策略规避制度变革中的风险,其重要性不言而喻。文章从制度经济学的理论出发,分析我国当前银行业对外开放制度安排的最新进展,阐述制度供求、制度成本与制度变革的关系,提出制度变革的主动防御的总体战略模式和渐进式的具体改革模式,对我国银行业对外开放的制度变革的模式进行前瞻性思考。     

指数保险有效性实证分析

运用Miranda模型研究发现,农户个体产量波动与所在区域产量波动存在高度正相关性,基于区域产量保险的保费率低于传统农业保险的保费率,这有利于刺激指数保险的需求。由于指数保险克服了传统农业保险市场中的逆向选择与道德风险问题,降低了交易成本,从而指数保险能够降低农户的保费支出并有效管理农业生产风险。     

叠加共轭对称训练序列的OFDM系统时频同步方法

针对正交频分复用（OFDM）系统对同步错误率和频率偏移敏感的问题,提出了一种叠加共轭对称训练序列的OFDM系统时间和频率同步方法。该同步方法将快速傅里叶逆变换（IFFT）调制后的序列构成具有共轭对称特性的训练序列,并叠加到OFDM数据符号上;在接收端,利用叠加训练序列和融合循环前缀信息来获取OFDM系统同步信息。理论分析和仿真表明：在信噪比为5 dB时,该同步算法定时同步正确概率已接近100%;在信噪比为4 dB时,频偏估计精度可以达到10-4;该同步算法不仅具有更好的同步性能,而且节省系统的有效带宽以及降低系统的计算法复杂度。     

我国区域间虚拟水贸易的前瞻思考

目前,从一个国家之内的“区域”角度分析虚拟水贸易对解决地区水资源短缺尚是空白。基于我国幅员辽阔,南北地区间水资源禀赋差异大的特点,文章提出我国应通过区域间的虚拟水贸易解决西北、华北等地区的水资源短缺、水环境污染等问题,并对我国区域间虚拟水贸易的必要性、可行性以及可能产生的问题进行分析,并提出相应时策。     

浅析铁路建设项目竣工图编制标准化管理

竣工图是高速铁路建设国家档案验收的重要组成部分,影响着工程验收的质量.依据现行技术规范和实际经验,总结铁路建设项目竣工图编制中出现的关键问题,进而加强竣工图编制管理准标化,提高铁路建设项目档案验收质量.     

内蒙古旅游应用型人才培养模式探讨

近年来,内蒙古旅游业发展迅速,不断发展的旅游业对高素质旅游人才需求越来越大,探索与市场需求相适应的旅游应用型人才培养模式成为内蒙古高校旅游教育的紧迫任务。内蒙古财经学院经过多年探索与实践,主动适应市场需求,改革办学观念,成功构建起旅游管理专业应用型人才培养模式,取了良好的效果。     

Business Ties and Information Advantage: Evidence from Mutual Fund Trading

This article examines whether ties to portfolio firms’ management via pension business relationships provide mutual funds with an informational advantage. Funds become related to portfolio companies when fund families serve as trustees for firms’ employee pension plans. Selling by related funds is more likely to be motivated by an information advantage than their buying, because the latter is heavily influenced by the desire to secure pension inflows. We find that stocks with larger net sales by related funds experience lower future returns. Information appears related to firm fundamentals, as the return predictability of related funds’ selling concentrates in stocks with negative future earnings surprises. Consistent with an information‐based explanation, the predictive power of related funds’ selling for future returns is more pronounced when information uncertainty about the stock is higher. Our results contribute to a growing literature that shows the sources of informed trading by institutions.     

Is there Causal Relationship between Money Supply Growth and Inflation in China? Evidence from Quantity Theory of Money

This study examines the causal relationship between Chinese money supply growth and inflation, using the bootstrap Granger full‐sample causality test and sub‐sample rolling‐window estimation test to determine whether such a relationship in China supports the quantity theory of money. The result indicates that there is a unidirectional relationship from inflation to money supply growth. However, considering structural changes in two series, we find that short‐run relationships using full‐sample data are unstable, which suggests that full‐sample causality tests cannot be relied upon. Then, we use a time‐varying rolling‐window approach to revisit the dynamic causal relationship, and the results show that money supply growth has both positive and negative impacts on inflation in several sub‐periods, and in turn, inflation has the same effects on money supply growth for China. These findings are basically consistent with the modern quantity theory of money from the perspective of money supply and price level. When money supply growth does not outweigh output growth, inflation should not be curbed only by decreasing money supply. It notes that a stable money supply growth is critical to price level stability and economic development in China.     

基于数字图像的顶管施工土层移动模型试验

为研究顶管施工土层的变形和移动规律,利用数字图像方法观测,建立了顶管施工土层移动模拟的物理模型,研究了顶管土层损失引起的上覆土层变形和移动规律,获得了如下结论:1)顶管施工地层损失引起顶管周围土体向顶管移动,最大变形发生在顶管周围;2)顶管地层移动从顶管周围向地表上方以一定角度传递和扩散,地表沉降范围大于顶管直径,顶管地表变形呈漏斗状,最大沉降在顶管的正上方;3)可以运用随机介质理论和概率积分法预测顶管施工地表变形;4)可以数码望远镜代替相机,采用数字图像方法观测顶管地表建筑物的非均匀变形。