In order to study the convection limits of surface fires and interactions between backfires and main fires,several experiments are conducted in a large space indoor laboratory: in which the effects of ambient wind spe...In order to study the convection limits of surface fires and interactions between backfires and main fires,several experiments are conducted in a large space indoor laboratory: in which the effects of ambient wind speeds and changing temperatures can be avoided.The research shows that:(1) there is a convection field in front of coming fires in which the wind speed direction is toward the fire.In the convection area,the lower part has higher wind speed and when the height is taller than a certain value the convection wind speed is not significant;(2) the backfire and the main fire interact with each other even though they are far apart.When they come near each other to a certain distance,they begin to draw each other.This increases their rates of spread toward each other significantly.For surface fires with a fire line intensity of 160?kW\5m -1 ,their rate of spread increases by 27%.展开更多
Since the global financial crisis,global value chain(GVC)have been contracting amid the trend toward economic de-globalization.With GVC participation rate in mind as the core indicator of economic de-globalization,in ...Since the global financial crisis,global value chain(GVC)have been contracting amid the trend toward economic de-globalization.With GVC participation rate in mind as the core indicator of economic de-globalization,in this paper we create a multi-country general equilibrium model to characterize the mechanism by which manufacturing localization affects GVC participation rate.Our theoretical derivation shows that changes in the local manufacturing status of final products in various countries directly influence the GVC participation rate of those countries.When the local proportion of a country’s final products reaches a certain level,rising local proportion of intermediate inputs,economic growth below the world average level,and technology progress all cause the country’s GVC participation rate to decline,giving rise to de-globalization at the manufacturing and trade levels.We further provide a comprehensive interpretation based on an empirical test of the deep-seated causes of economic de-globalization in relation to such economic phenomena as increasing trade concentration,the“technology backlash”effect of the new industrial revolution,and economic growth driven by the combined forces of trade protectionism and quantitative easing.展开更多
The expansion strategy is an important tool for enterprises to achieve growth and transformation,but it may lead to a lack of liquidity and thus a rapid decline.Does liquidity have a backfire effect on profits and thu...The expansion strategy is an important tool for enterprises to achieve growth and transformation,but it may lead to a lack of liquidity and thus a rapid decline.Does liquidity have a backfire effect on profits and thus lead to enterprise decline?Based on the life cycle theory,the empirical study of 72 ST-listed companies in China from 2010 to 2020 shows that liquidity is significantly and positively correlated with profits during the expansion period and negatively correlated with profits during the recession period,and the effect becomes larger as the characteristics of enterprise life cycle change gradually.The study also shows that profit and liquidity risk do not necessarily follow the principle of equal increase or decrease in different periods,which provides a new path for enterprise to strengthen liquidity risk management.展开更多
Congressional Republicans backed by the Trump administration are railroading controversial tax legislation at the year＇s end. Critics say it amounts to class warfare as it benefits the rich and corporate America whil...Congressional Republicans backed by the Trump administration are railroading controversial tax legislation at the year＇s end. Critics say it amounts to class warfare as it benefits the rich and corporate America while hurting the working classes.展开更多
文摘In order to study the convection limits of surface fires and interactions between backfires and main fires,several experiments are conducted in a large space indoor laboratory: in which the effects of ambient wind speeds and changing temperatures can be avoided.The research shows that:(1) there is a convection field in front of coming fires in which the wind speed direction is toward the fire.In the convection area,the lower part has higher wind speed and when the height is taller than a certain value the convection wind speed is not significant;(2) the backfire and the main fire interact with each other even though they are far apart.When they come near each other to a certain distance,they begin to draw each other.This increases their rates of spread toward each other significantly.For surface fires with a fire line intensity of 160?kW\5m -1 ,their rate of spread increases by 27%.
基金the major project under the National Social Science Fund of China (NSSFC)“Advancing New-Type Industrialization and the Optimization and Upgrade of the Economic System” for interpreting the spirit of the Fifth Plenary Session of the 19th Communist Party of China (CPC) Central Committee (21ZDA021)and the Innovation Project of the Chinese Academy of Social Sciences (CASS),“Study on the High-Quality Development of Emerging Industries.”
文摘Since the global financial crisis,global value chain(GVC)have been contracting amid the trend toward economic de-globalization.With GVC participation rate in mind as the core indicator of economic de-globalization,in this paper we create a multi-country general equilibrium model to characterize the mechanism by which manufacturing localization affects GVC participation rate.Our theoretical derivation shows that changes in the local manufacturing status of final products in various countries directly influence the GVC participation rate of those countries.When the local proportion of a country’s final products reaches a certain level,rising local proportion of intermediate inputs,economic growth below the world average level,and technology progress all cause the country’s GVC participation rate to decline,giving rise to de-globalization at the manufacturing and trade levels.We further provide a comprehensive interpretation based on an empirical test of the deep-seated causes of economic de-globalization in relation to such economic phenomena as increasing trade concentration,the“technology backlash”effect of the new industrial revolution,and economic growth driven by the combined forces of trade protectionism and quantitative easing.
文摘The expansion strategy is an important tool for enterprises to achieve growth and transformation,but it may lead to a lack of liquidity and thus a rapid decline.Does liquidity have a backfire effect on profits and thus lead to enterprise decline?Based on the life cycle theory,the empirical study of 72 ST-listed companies in China from 2010 to 2020 shows that liquidity is significantly and positively correlated with profits during the expansion period and negatively correlated with profits during the recession period,and the effect becomes larger as the characteristics of enterprise life cycle change gradually.The study also shows that profit and liquidity risk do not necessarily follow the principle of equal increase or decrease in different periods,which provides a new path for enterprise to strengthen liquidity risk management.
文摘Congressional Republicans backed by the Trump administration are railroading controversial tax legislation at the year＇s end. Critics say it amounts to class warfare as it benefits the rich and corporate America while hurting the working classes.
