国际原油价格与美元指数的互动关系研究——基于VAR模型的实证分析

美元指数与国际原油价格具有互动关系。本文基于VAR模型,应用协整检验、格兰杰因果关系检验、脉冲响应等方法,对比分析了国际原油价格与美元指数在2002年1月至2008年7月、2008年8月至2012年3月两阶段的互动关系。在实证基础上本文提出要深入理解石油与美元的互动机制,尽快完善成品油定价机制     

浅谈扩大内需问题

在当前国际形势下,扩大内需是中国经济发展的首要目标.本文分析了扩大消费需求是中国经济发展的必然选择,以及抑制内需的诸多原因,并提出了相关对策.     

货币政策调控中的中国

针对当前金融危机下我国出台的货币政策,分析我国货币政策的历程,并浅析货币政策的效果及出现的原因,分析该如何完善现有制度以提高货币政策的有效性.     

Numerical research on the mechanism of contaminant release through the porous sediment-overlying water interface

After the pollutant discharged into the river or lake has been reduced, the release of the contaminant from the sediment to the overlying water may cause the river and lake be contaminated again. On the condition that the overlying water flow does not lead to sediment suspension, numerical researches are carried out for the mechanism of contaminant release through the sedimentoverlying water interface. The overlying water flow is calculated as turbulence. The sediment is regarded as isotropic homogeneous porous medium, therefore the seepage field in the porous sediment layer is obtained by solving Darcy＇s equations. Coupled two dimensional steady flows of the overlying water and the pore water in the sediment are calculated. Based on the flow fields obtained, the unsteady contaminant solute transportation process in the pore water in the sediment and the overlying water is numerically simulated, as the shapes of the sediment-overlying water interface are flat or periodic triangular respectively. Numerical results show that the exchange of the pore water and the overlying water is an important factor which decides the release flux of the contaminant from the sediment to the overlying water. The pressure distribution produced by the overlying water flow along the sedimentoverlying water interface, as it is not flat, may induce the seepage of the pore water in the sediment and through the sedimentoverlying water interface, which may increase the release flux of the contaminant from the sediment to the overlying water.     

贸易便利化对我国跨境电商综试区电商发展促进作用分析

以我国跨境电子商务综合试验区为研究对象,选取2013—2019年的样本数据,运用双重差分法,分析贸易便利化政策的实施与跨境电商发展水平之间的关系。实证结果表明,贸易便利化政策的实施有利于促进跨境电商的良性发展。提出要从完善综试区有关规章制度、建立跨境物流系统、提升信息化水平、总结建设跨境电商综合服务平台五个方面,促进我国跨境电商的发展。