This study measured the level of innovation achievement protection and the degree of internal structural upgrading of the productive service industry in 28 provinces of China from 2000 to 2022.Exploratory spatial anal...This study measured the level of innovation achievement protection and the degree of internal structural upgrading of the productive service industry in 28 provinces of China from 2000 to 2022.Exploratory spatial analysis methods were used to test the spatial correlation between the two variables,and the spatial impact of innovation achievement protection on the optimization of the internal structure of the productive service industry was examined at the national and sectoral levels.The results showed three main aspects of this system.(1)The agglomeration level of innovation achievement protection and internal structure optimization of the productive service industry between regions in China continued to increase during the sample period,and there was a clear similarity and synchronicity in the spatial evolution of the two variables.(2)The overall improvement in the protection level of innovative achievements is conducive to promoting the internal structural upgrading of China’s productive service industry.However,there are significant differences in the degree to which the protection of innovative achievements affects the internal structural upgrading of the productive service industry in the four major regions of the East,Central,Northeast,and West.The protection of innovative achievements in the East and Central regions significantly promotes the internal structural optimization of the productive service industry,while this effect is not significant in the western and northeastern regions.(3)The results of the robustness test indicate that the impact of internal structural upgrading of the productive service industry in the previous year on the level of innovation achievement protection is not significant.The interference from abnormal values of the internal structural upgrading of the productive service industry in various regions and the influence of municipalities directly under the central government on the regression results are not significant.After replacing the main variable,the coefficient of the innovation achievement protection level remained significantly positive.The conclusions of this study supplement and improve the theory of innovation achievement protection and industrial transformation and upgrading,providing decision-making support for improving the level of innovation achievement protection and promoting the internal structural upgrading of the productive service industries in China.展开更多
Rising export and market shares and rampant bankruptcies coexist in China's apparel industry.Against the backdrop of the global value chain,the by-country industrial competitiveness evaluation system based on fina...Rising export and market shares and rampant bankruptcies coexist in China's apparel industry.Against the backdrop of the global value chain,the by-country industrial competitiveness evaluation system based on final products is failing.Using the global value chain theory,this article investigates the international competitiveness of China's apparel industry and introduces the case study of Nike's global value chain,reaching the conclusion that existing evaluations have exaggerated the international competitiveness of China's apparel industry.China's apparel industry is at the lowest level of the global value chain,and most local enterprises have not entered the mainstream global value chain and are still internationally uncompetitive.As far as China's current economic development level and targets are concerned,it may be too unrealistic to discuss industrial upgrading entirely from the perspective of OEM-ODM-OBM.China's apparel producers should stick to both paths:one is the priority to strengthen manufacturing and OEM;the other is to do more learning to go beyond sub-contract manufacturing and prepare for long-term growth of OBM.Building middle and high-end apparel producers and creating local brands by virtue of China's status as a big country is the right path for development given the industry's present situation.展开更多
The receiver is an important element in solar energy plants.The principal receiver’s tubes in power plants are devised to work under extremely severe conditions,including excessive heat fluxes.Half of the tube’s cir...The receiver is an important element in solar energy plants.The principal receiver’s tubes in power plants are devised to work under extremely severe conditions,including excessive heat fluxes.Half of the tube’s circumference is heated whilst the other half is insulated.This study aims to improve the heat transfer process and reinforce the tubes’structure by designing a new receiver;by including longitudinal fins of triangular,circular and square shapes.The research is conducted experimentally using Reynolds numbers ranging from 28,000 to 78,000.Triangular fins have demonstrated the best improvement for heat transfer.For Reynolds number value near 43,000 Nusselt number(Nu)is higher by 3.5%and 7.5%,sequentially,compared to circular and square tube fins,but varies up to 6.5%near Re=61000.The lowest friction factor is seen in a triangular fin receiver;where it deviates from circular fins by 4.6%,and square fin tubes by 3.2%.Adding fins makes the temperature decrease gradually,and in the case of no fins,the temperature gradient between the hot tube and water drops sharply in the planed tube by 7%.展开更多
基金The National Social Science Foundation of China(23BJL091)。
文摘This study measured the level of innovation achievement protection and the degree of internal structural upgrading of the productive service industry in 28 provinces of China from 2000 to 2022.Exploratory spatial analysis methods were used to test the spatial correlation between the two variables,and the spatial impact of innovation achievement protection on the optimization of the internal structure of the productive service industry was examined at the national and sectoral levels.The results showed three main aspects of this system.(1)The agglomeration level of innovation achievement protection and internal structure optimization of the productive service industry between regions in China continued to increase during the sample period,and there was a clear similarity and synchronicity in the spatial evolution of the two variables.(2)The overall improvement in the protection level of innovative achievements is conducive to promoting the internal structural upgrading of China’s productive service industry.However,there are significant differences in the degree to which the protection of innovative achievements affects the internal structural upgrading of the productive service industry in the four major regions of the East,Central,Northeast,and West.The protection of innovative achievements in the East and Central regions significantly promotes the internal structural optimization of the productive service industry,while this effect is not significant in the western and northeastern regions.(3)The results of the robustness test indicate that the impact of internal structural upgrading of the productive service industry in the previous year on the level of innovation achievement protection is not significant.The interference from abnormal values of the internal structural upgrading of the productive service industry in various regions and the influence of municipalities directly under the central government on the regression results are not significant.After replacing the main variable,the coefficient of the innovation achievement protection level remained significantly positive.The conclusions of this study supplement and improve the theory of innovation achievement protection and industrial transformation and upgrading,providing decision-making support for improving the level of innovation achievement protection and promoting the internal structural upgrading of the productive service industries in China.
基金Evaluation of the International Competitiveness of "Made in China" under Global Value Chain and Research on Strategies for Upgrade (Approval No.70772046)Two-dimensional Evaluation on the Industrial Competitiveness under Global Value Chain and Research on Its Evolution (Approval No.:07CJY009)
文摘Rising export and market shares and rampant bankruptcies coexist in China's apparel industry.Against the backdrop of the global value chain,the by-country industrial competitiveness evaluation system based on final products is failing.Using the global value chain theory,this article investigates the international competitiveness of China's apparel industry and introduces the case study of Nike's global value chain,reaching the conclusion that existing evaluations have exaggerated the international competitiveness of China's apparel industry.China's apparel industry is at the lowest level of the global value chain,and most local enterprises have not entered the mainstream global value chain and are still internationally uncompetitive.As far as China's current economic development level and targets are concerned,it may be too unrealistic to discuss industrial upgrading entirely from the perspective of OEM-ODM-OBM.China's apparel producers should stick to both paths:one is the priority to strengthen manufacturing and OEM;the other is to do more learning to go beyond sub-contract manufacturing and prepare for long-term growth of OBM.Building middle and high-end apparel producers and creating local brands by virtue of China's status as a big country is the right path for development given the industry's present situation.
文摘The receiver is an important element in solar energy plants.The principal receiver’s tubes in power plants are devised to work under extremely severe conditions,including excessive heat fluxes.Half of the tube’s circumference is heated whilst the other half is insulated.This study aims to improve the heat transfer process and reinforce the tubes’structure by designing a new receiver;by including longitudinal fins of triangular,circular and square shapes.The research is conducted experimentally using Reynolds numbers ranging from 28,000 to 78,000.Triangular fins have demonstrated the best improvement for heat transfer.For Reynolds number value near 43,000 Nusselt number(Nu)is higher by 3.5%and 7.5%,sequentially,compared to circular and square tube fins,but varies up to 6.5%near Re=61000.The lowest friction factor is seen in a triangular fin receiver;where it deviates from circular fins by 4.6%,and square fin tubes by 3.2%.Adding fins makes the temperature decrease gradually,and in the case of no fins,the temperature gradient between the hot tube and water drops sharply in the planed tube by 7%.
