In this paper,a singularly perturbed problem for the stable fluid flow is considered.As supersonic speed at upper reaches and subsonic speed at lower reaches in a duct,the position of shock layer is analyzed and the a...In this paper,a singularly perturbed problem for the stable fluid flow is considered.As supersonic speed at upper reaches and subsonic speed at lower reaches in a duct,the position of shock layer is analyzed and the asymptotic estimation of solution is obtained.展开更多
Does public opinion influence US imports?Do countries with a good reputation export more to the US?And vice versa?Based on an extended trade gravity model,this paper employs news data from the GDELT database and US mo...Does public opinion influence US imports?Do countries with a good reputation export more to the US?And vice versa?Based on an extended trade gravity model,this paper employs news data from the GDELT database and US monthly import data to create an indicator of the influence of public opinion to examine the effects of US domestic public opinion on imports.Our research findings suggest that:(i)US public opinion influences US imports.Specifically,(ii)when public opinion turned negative during 2013-2017,it exerted a significantly negative effect on US imports;when public opinion was favorable during 2008-2012,it exerted an insignificantly positive effect on US imports.(iii)According to the pulse response function and variance decomposition,negative public opinion exerted a more significant and more lasting effect on US imports compared with positive public opinion.(iv)It can be discovered after further decomposing such effects on product categories that significant product heterogeneity exists in the public opinion effects on US imports:Complex and differentiated products are more influenced by negative public opinion while homogeneous and intermediate products are more influenced by positive public opinion.展开更多
文摘In this paper,a singularly perturbed problem for the stable fluid flow is considered.As supersonic speed at upper reaches and subsonic speed at lower reaches in a duct,the position of shock layer is analyzed and the asymptotic estimation of solution is obtained.
基金the Major Tendering Project of the National Social Science Fund of China(NSSFC)“Study on the Theory and Practiceof Inclusive Green Growth(19ZDA048)”the Advantageous Discipline of CASS Peak Strategy(industrial economics).
文摘Does public opinion influence US imports?Do countries with a good reputation export more to the US?And vice versa?Based on an extended trade gravity model,this paper employs news data from the GDELT database and US monthly import data to create an indicator of the influence of public opinion to examine the effects of US domestic public opinion on imports.Our research findings suggest that:(i)US public opinion influences US imports.Specifically,(ii)when public opinion turned negative during 2013-2017,it exerted a significantly negative effect on US imports;when public opinion was favorable during 2008-2012,it exerted an insignificantly positive effect on US imports.(iii)According to the pulse response function and variance decomposition,negative public opinion exerted a more significant and more lasting effect on US imports compared with positive public opinion.(iv)It can be discovered after further decomposing such effects on product categories that significant product heterogeneity exists in the public opinion effects on US imports:Complex and differentiated products are more influenced by negative public opinion while homogeneous and intermediate products are more influenced by positive public opinion.
