Currently,driven by the accelerated iteration of digital technologies such as big data,cloud computing,and artificial intelligence,the digital economy has become a crucial engine for generating new quality productive ...Currently,driven by the accelerated iteration of digital technologies such as big data,cloud computing,and artificial intelligence,the digital economy has become a crucial engine for generating new quality productive forces and promoting industrial upgrading.Building on a systematic review of the theoretical evolution and measurement methods of the digital economy and new quality productive forces,this paper outlines their enabling mechanisms,industrial synergy pathways,and policy practices,and summarizes regional disparities and spatial spillover effects.The main findings are as follows:First,the digital economy reshapes the traditional factor structure and significantly enhances total factor productivity through the permeation of data elements and technological innovation;Second,driven jointly by the consumer internet and the industrial internet,it optimizes supply–demand matching and service models while reducing operating costs and improving production efficiency;Third,policy environments and institutional coordination amplify the enabling effects,as evidenced notably in national big-data pilot zones and the“East Data West Computing”initiative.Looking ahead,empirical research should deepen the exploration of micro-level mechanisms and dynamic panel analyses,construct a measurement system of new quality productive forces that spans macro,meso,and micro scales,and investigate pathways for regional collaborative governance and green digital integration to address the complex challenges of the new era.展开更多
目的探讨MRI以及MSCT检查对成人外伤性膝关节损伤的诊断价值,并分析其临床价值。方法收集我院2017年11月至2019年6月收治的67例膝关节损伤患者的临床资料,分析67例患者MSCT检查和MRI检查图像表现,对比两种检查对外伤性膝关节损伤的诊断...目的探讨MRI以及MSCT检查对成人外伤性膝关节损伤的诊断价值,并分析其临床价值。方法收集我院2017年11月至2019年6月收治的67例膝关节损伤患者的临床资料,分析67例患者MSCT检查和MRI检查图像表现,对比两种检查对外伤性膝关节损伤的诊断情况。结果MSCT对韧带损伤、半月板损伤、骨质损伤、关节腔积液的诊断正确率分别为83.33%、78.57%、86.67%、90.91%,MRI检查分别为100%、96.42%、93.33%、90.91%,MRI对半月板损伤诊断正确率高于MSCT(P<0.05);M S CT对外伤性膝关节损伤整体诊断正确率为82.08%,低于MRI检查95.52%(P<0.05)。MSCT检查中,韧带损伤患者图像可见韧带肿胀,密度呈不均匀增高,边缘模糊;在MRI中可见条状阴影,伴有边缘模糊增粗等现象,T1WI序列低信号,T2WI序列较高信号,STIR序列高信号。结论MSCT检查可对膝关节病变诊断有一定的参考价值,但是MRI检查更能全面地反映膝关节损伤情况,且诊断正确率高于MSCT,可作为膝关节损伤首选检查。展开更多
In response to the fact that the presence of manganese dithionate(MnS_(2)O_(6))leads to a series of adverse impacts,especially lower purity of manganese sulfate(MnSO_(4))and disruption of its recovery,advanced oxidati...In response to the fact that the presence of manganese dithionate(MnS_(2)O_(6))leads to a series of adverse impacts,especially lower purity of manganese sulfate(MnSO_(4))and disruption of its recovery,advanced oxidation methods such as ozonation system are used to manage MnS_(2)O_(6)in the leaching solution,replacing conventional methods.To ascertain the conversion rate and kinetics of MnS_(2)O_(6)during the ozonation process,we explored the factors influencing its removal rate,including ozone dosage,manganese dithionate concentration,sulfuric acid concentration,and reaction temperature.Batch experiments were conducted to determine the reaction rate constant of ozone(k)and activation energy(Ea)obtained from intermittent experimental data fitting,revealing a least-squares exponential conversion relationship between k and the MnS_(2)O_(6)removal amount,wherein an increase in the aforementioned factors led to an enhanced MnS_(2)O_(6)conversion rate,exceeding 99.3%.The formation mechanism of the ozone products proposed during the experiment was summarized and proposed as follows:1)Mn^(2+)was directly oxidized to MnO_(2),and 2)SO_(4)2−was obtained by the catalytic oxidation of S_(2)O_(6)^(2−)with HO•from O3 decomposition.According to the kinetics analysis,the pre-exponential factor and total activation energy of the ozonation kinetics equation were 1.0×10^(23) s^(−1) and 177.28 kJ/mol,respectively.Overall,the present study demonstrates that O_(3) as an oxidizing agent can effectively facilitate MnS_(2)O_(6)disproportionation while preventing the release of the secondary pollutant,SO_(2)gas.展开更多
文摘Currently,driven by the accelerated iteration of digital technologies such as big data,cloud computing,and artificial intelligence,the digital economy has become a crucial engine for generating new quality productive forces and promoting industrial upgrading.Building on a systematic review of the theoretical evolution and measurement methods of the digital economy and new quality productive forces,this paper outlines their enabling mechanisms,industrial synergy pathways,and policy practices,and summarizes regional disparities and spatial spillover effects.The main findings are as follows:First,the digital economy reshapes the traditional factor structure and significantly enhances total factor productivity through the permeation of data elements and technological innovation;Second,driven jointly by the consumer internet and the industrial internet,it optimizes supply–demand matching and service models while reducing operating costs and improving production efficiency;Third,policy environments and institutional coordination amplify the enabling effects,as evidenced notably in national big-data pilot zones and the“East Data West Computing”initiative.Looking ahead,empirical research should deepen the exploration of micro-level mechanisms and dynamic panel analyses,construct a measurement system of new quality productive forces that spans macro,meso,and micro scales,and investigate pathways for regional collaborative governance and green digital integration to address the complex challenges of the new era.
文摘目的探讨MRI以及MSCT检查对成人外伤性膝关节损伤的诊断价值,并分析其临床价值。方法收集我院2017年11月至2019年6月收治的67例膝关节损伤患者的临床资料,分析67例患者MSCT检查和MRI检查图像表现,对比两种检查对外伤性膝关节损伤的诊断情况。结果MSCT对韧带损伤、半月板损伤、骨质损伤、关节腔积液的诊断正确率分别为83.33%、78.57%、86.67%、90.91%,MRI检查分别为100%、96.42%、93.33%、90.91%,MRI对半月板损伤诊断正确率高于MSCT(P<0.05);M S CT对外伤性膝关节损伤整体诊断正确率为82.08%,低于MRI检查95.52%(P<0.05)。MSCT检查中,韧带损伤患者图像可见韧带肿胀,密度呈不均匀增高,边缘模糊;在MRI中可见条状阴影,伴有边缘模糊增粗等现象,T1WI序列低信号,T2WI序列较高信号,STIR序列高信号。结论MSCT检查可对膝关节病变诊断有一定的参考价值,但是MRI检查更能全面地反映膝关节损伤情况,且诊断正确率高于MSCT,可作为膝关节损伤首选检查。
基金Project(2022M710619)supported by the Postdoctoral Science Foundation of ChinaProjects(2020YFH0213,2020YFG0039)supported by the Sichuan Science and Technology Program,China+1 种基金Projects(XJ2024001501,KCXTD2023-4)supported by the Basic Scientific Foundation and Innovation Team Funds of China West Normal UniversityProject(CSPC202403)supported by the Open Project Program of Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province,China。
文摘In response to the fact that the presence of manganese dithionate(MnS_(2)O_(6))leads to a series of adverse impacts,especially lower purity of manganese sulfate(MnSO_(4))and disruption of its recovery,advanced oxidation methods such as ozonation system are used to manage MnS_(2)O_(6)in the leaching solution,replacing conventional methods.To ascertain the conversion rate and kinetics of MnS_(2)O_(6)during the ozonation process,we explored the factors influencing its removal rate,including ozone dosage,manganese dithionate concentration,sulfuric acid concentration,and reaction temperature.Batch experiments were conducted to determine the reaction rate constant of ozone(k)and activation energy(Ea)obtained from intermittent experimental data fitting,revealing a least-squares exponential conversion relationship between k and the MnS_(2)O_(6)removal amount,wherein an increase in the aforementioned factors led to an enhanced MnS_(2)O_(6)conversion rate,exceeding 99.3%.The formation mechanism of the ozone products proposed during the experiment was summarized and proposed as follows:1)Mn^(2+)was directly oxidized to MnO_(2),and 2)SO_(4)2−was obtained by the catalytic oxidation of S_(2)O_(6)^(2−)with HO•from O3 decomposition.According to the kinetics analysis,the pre-exponential factor and total activation energy of the ozonation kinetics equation were 1.0×10^(23) s^(−1) and 177.28 kJ/mol,respectively.Overall,the present study demonstrates that O_(3) as an oxidizing agent can effectively facilitate MnS_(2)O_(6)disproportionation while preventing the release of the secondary pollutant,SO_(2)gas.
