Since the COVID-19 pandemic began in late 2019,economic uncertainty and supply chain disruptions have significantly affected China’s real economy.This has reduced consumer reliance on physical stores,increasing marke...Since the COVID-19 pandemic began in late 2019,economic uncertainty and supply chain disruptions have significantly affected China’s real economy.This has reduced consumer reliance on physical stores,increasing market and operational risks for brick-and-mortar retailers.This study analyzes the impact of the pandemic on shopping center performance using operational data from 7,010 stores in China alongside COVID-19-related data.The analysis focuses on two indicators:Rent levels and lease termination rates,considering both rental and tenant perspectives.Findings reveal that COVID-19 negatively impacts retail rents and lease termination rates,with regions experiencing severe outbreaks facing greater declines.During lockdowns,the negative effects on rents and termination rates were more pronounced than during the broader pandemic period.Additionally,stores with sales-based rent experience a greater adverse impact compared to those without.The study concludes that the pandemic significantly reduces store rent while the likelihood of early lease terminations remains relatively low.These empirical results offer valuable insights for shopping center operational management and crisis response strategies.展开更多
The authors give a stochastic maximum principle for square-integrable optimal control of linear stochastic systems.The control domain is not necessarily convex and the cost functional can have a quadratic growth.In pa...The authors give a stochastic maximum principle for square-integrable optimal control of linear stochastic systems.The control domain is not necessarily convex and the cost functional can have a quadratic growth.In particular,they give a stochastic maximum principle for the linear quadratic optimal control problem.展开更多
Chronic wounds,which require prolonged healing periods,pose significant impacts on individuals with diabetes,vascular diseases,and high blood pressure.Simultaneous drainage and monitoring of wound exudate are vital fo...Chronic wounds,which require prolonged healing periods,pose significant impacts on individuals with diabetes,vascular diseases,and high blood pressure.Simultaneous drainage and monitoring of wound exudate are vital for advanced wound management.However,recently reported smart dressings either lack integration of wound cleaning and monitoring functions or fail to achieve dynamic in situ monitoring of wound status,which hinders their ability to meet the demands of wound care.In this study,a smart bandage is introduced,which integrates a biocompatible liquid diode membrane with an ultrasensitive 3D polyaniline mesh(M-PANI)-based pH biosensor.The smart bandage allows for unidirectional drainage of wound exudate while dynamically sensing the wound pH environment.Specifically,the proposed smart bandage effectively cleans excessive wound exudate while providing real-time information on the wound status during the drainage process.The M-PANI-based pH biosensor demonstrates a high sensitivity of 61.5 mV/pH and a wide pH detection range from 4.0 to 10.0,encompassing the pH range of normal and infected wounds.Moreover,the sensing module exhibits excellent stability after 48 hours of dynamic testing and 28 days of storage,with only a 4.8%decline in the detected signal,and high repeatability with a device-to-device relative standard deviation(RSD)of 3.1%.To evaluate the practicality of this smart bandage,simulated skin and rats have been employed,and the results indicate the immense potential of this smart bandage for clinical applications.In conclusion,the present smart bandage demonstrates considerable promise for wound exudate cleaning and monitoring in advanced wound care and offers a promising method for home-based wound management.展开更多
基金Supported by the National Natural Science Foundation of China(72172145,71932002,61973329)Open Projects of the Institute of Systems Science,Beijing Wuzi University(BWUISS46)。
文摘Since the COVID-19 pandemic began in late 2019,economic uncertainty and supply chain disruptions have significantly affected China’s real economy.This has reduced consumer reliance on physical stores,increasing market and operational risks for brick-and-mortar retailers.This study analyzes the impact of the pandemic on shopping center performance using operational data from 7,010 stores in China alongside COVID-19-related data.The analysis focuses on two indicators:Rent levels and lease termination rates,considering both rental and tenant perspectives.Findings reveal that COVID-19 negatively impacts retail rents and lease termination rates,with regions experiencing severe outbreaks facing greater declines.During lockdowns,the negative effects on rents and termination rates were more pronounced than during the broader pandemic period.Additionally,stores with sales-based rent experience a greater adverse impact compared to those without.The study concludes that the pandemic significantly reduces store rent while the likelihood of early lease terminations remains relatively low.These empirical results offer valuable insights for shopping center operational management and crisis response strategies.
基金supported by the National Natural Science Foundation of China(No.12031009)。
文摘The authors give a stochastic maximum principle for square-integrable optimal control of linear stochastic systems.The control domain is not necessarily convex and the cost functional can have a quadratic growth.In particular,they give a stochastic maximum principle for the linear quadratic optimal control problem.
基金supported by a National Natural Science Foundation of China grant(82272121)to H.W.
文摘Chronic wounds,which require prolonged healing periods,pose significant impacts on individuals with diabetes,vascular diseases,and high blood pressure.Simultaneous drainage and monitoring of wound exudate are vital for advanced wound management.However,recently reported smart dressings either lack integration of wound cleaning and monitoring functions or fail to achieve dynamic in situ monitoring of wound status,which hinders their ability to meet the demands of wound care.In this study,a smart bandage is introduced,which integrates a biocompatible liquid diode membrane with an ultrasensitive 3D polyaniline mesh(M-PANI)-based pH biosensor.The smart bandage allows for unidirectional drainage of wound exudate while dynamically sensing the wound pH environment.Specifically,the proposed smart bandage effectively cleans excessive wound exudate while providing real-time information on the wound status during the drainage process.The M-PANI-based pH biosensor demonstrates a high sensitivity of 61.5 mV/pH and a wide pH detection range from 4.0 to 10.0,encompassing the pH range of normal and infected wounds.Moreover,the sensing module exhibits excellent stability after 48 hours of dynamic testing and 28 days of storage,with only a 4.8%decline in the detected signal,and high repeatability with a device-to-device relative standard deviation(RSD)of 3.1%.To evaluate the practicality of this smart bandage,simulated skin and rats have been employed,and the results indicate the immense potential of this smart bandage for clinical applications.In conclusion,the present smart bandage demonstrates considerable promise for wound exudate cleaning and monitoring in advanced wound care and offers a promising method for home-based wound management.
