In the version of this article initially published,the supporting information was incorrectly uploaded,which was a mistake not attributable to the authors.The correct version has now been replaced.
Establishing supply chains for future ammonia energy systems requires the development of efficient materials and processes for ammonia production under mild conditions.Recent researches disclose unique functionalities...Establishing supply chains for future ammonia energy systems requires the development of efficient materials and processes for ammonia production under mild conditions.Recent researches disclose unique functionalities of binary alkali and alkaline earth metal hydrides in mediating ammonia synthesis.Thanks to the rich compositional and structural properties of the metalhydrogen system,we herein report that LiBaH_(3),as a narrow band gap perovskite hydride,exhibits a strong response to visible light illumination.Specifically,hydridic hydrogen undergoes reductive elimination of producing H_(2)and creates an electron-rich surface.Such an environment favors dinitrogen fixation to form N-H bonds.Based on this chemical property,a chemical looping ammonia synthesis process mediated by LiBaH_(3)and driven by both photo and thermal energies was proposed and evaluated.This work demonstrates that hydride perovskites are promising candidates for mediating photo-assisted nitrogen fixation reactions.展开更多
The global pandemic of 2019 coronavirus disease(COVID-19)is a great assault to public health.Presymptomatic transmission cannot be controlled with measures designed for symptomatic persons,such as isolation.This study...The global pandemic of 2019 coronavirus disease(COVID-19)is a great assault to public health.Presymptomatic transmission cannot be controlled with measures designed for symptomatic persons,such as isolation.This study aimed to estimate the interval of the transmission generation(TG)and the presymptomatic period of COVID-19,and compare the ftting effects of TG and serial interval(S)based on the SEIHR model incorporating the surveillance data of 3453 cases in 31 provinces.These data were allocated into three distributions and the value of AIC presented that the Weibull distribution fitted well.The mean of TG was 5.2 days(95%C:4.6-5.8).The mean of the presymptomatic period was 2.4 days(95%CI:1.5-3.2).The dynamic model using TG as the generation time performed well.Eight provinces exhibited a basic reproduction number from 2.16 to 3.14.Measures should be taken to control presymptomatic transmission in the COVID-19 pandemic.展开更多
Urban underlying surface has been greatly changed with rapid urbanization, considered to be one of the major causes for the destruction of urban natural hydrological processes. This has imposed a huge challenge for st...Urban underlying surface has been greatly changed with rapid urbanization, considered to be one of the major causes for the destruction of urban natural hydrological processes. This has imposed a huge challenge for stormwater management in cities. There has been a shift from gray water management to green stormwater management thinking. The green stormwater infrastructure （GSI） is regarded as an effective and cost-efficient stormwater management eco-landscape approach. China＇s GSI practice and the development of its theoretical framework are still in the initial stage. This paper presents an innovative framework for stormwater management, integrating green stormwater infrastructure and landscape security patterns on a regional scale based on an urban master plan. The core concept of green stormwater infrastructure eco-planning is to form an interconnected GSI network （i.e., stormwater management landscape security pattern） which consists of the location, portion, size, layout, and structure of GSI so as to efficiently safeguard natural hydrological processes. Shanghai Lin- gang New City, a satellite new town of Shanghai, China was selected as a case study for GSI studies. Simulation analyses of hydrological processes were carried out to identify the critical significant landscape nodes in the high- priority watersheds for stormwater management. GSI should be planned and implemented in these identified landscape nodes. The comprehensive stormwater manage- ment landscape security pattern of Shanghai Lingang New City is designed with consideration of flood control, stormwater control, runoff reduction, water quality protec- tion, and rainwater utilization objectives which couldprovide guidelines for smart growth and sustainable development of this city.展开更多
In this paper, we investigate the dynamics of a diffusive predator prey model with Holling-II functional response and the additive Allee effect in prey. We show the local and global asymptotical stability of the posit...In this paper, we investigate the dynamics of a diffusive predator prey model with Holling-II functional response and the additive Allee effect in prey. We show the local and global asymptotical stability of the positive equilibrium, and give the conditions of the existence of the Hopf bifurcation. By carrying out global qualitative and bifurcation analysis, it is shown that the weak and strong Allee effects in prey can induce different dynamical behavior in the predator-prey model. Furthermore, we use some numerical simulations to illustrate the dynamics of the model. The results may be helpful for controlling and managing the predator-prey system.展开更多
In this paper,based on the statistical data,we investigate the effects of long-term exposure to ambient particulate air pollution on the transmission dynamics of tuberculosis(TB)in Jiangsu,China by studying the thresh...In this paper,based on the statistical data,we investigate the effects of long-term exposure to ambient particulate air pollution on the transmission dynamics of tuberculosis(TB)in Jiangsu,China by studying the threshold dynamics of the TB epidemic model via the statistical data analytically and numerically.The basic reproduction number R_(0)>1 reveals that TB in Jiangsu,China is an endemic disease and will persist for a long time.And the numerical results show that,in order to control the TB in Jiangsu effectively,we must decrease the depuration coefficient of PM10 in the body,the proportion of TB symptomatic infectious by direct transmission,the reactivation rate of the pre-symptomatic infectious and the effect coefficient of PM10 and MTB inhaled of TB transmission,and increase the uptake coefficient,the recovery rate of the symptomatic/pre-symptomatic infectious and the influence coefficient of PM10 on the body of mortality.Our study shows that PM10 is closely related to the incidence of TB,and the effective control efforts are suggested to focus on increasing close-contact distance and wearing protective mask to decrease the influence of PM10 on the TB transmission,which may shed a new light on understanding the environmental drivers to TB.展开更多
In this paper, we investigate the spatiotemporal dynamics of a reactio^diffusion epi- demic model with zero-flux boundary conditions. The value of our study lies in two aspects： mathematically, by using maximum princ...In this paper, we investigate the spatiotemporal dynamics of a reactio^diffusion epi- demic model with zero-flux boundary conditions. The value of our study lies in two aspects： mathematically, by using maximum principle and the linearized stability theory, a priori estimates of the steady state system and the local asymptotic stability of positive constant solution are given. By using the implicit function theorem, the exis- tence and nonexistence of nonconstant positive steady states are shown. Applying the bifurcation theory, the global bifurcation structure of nonconstant positive steady states is established. Epidemiologically, through numerical simulations, under the conditions of the existence of nonconstant positive steady states, we find that the smaller the space, the easier the pattern formation; the bigger the diffusion, the easier the pattern formation. These results are beneficial to disease control, that is, we must do our best to control the diffusion of the infectious to avoid disease outbreak.展开更多
A recent paper [W. D. Wang, Modeling adaptive behavior in influenza transmission, Math. Model. Nat. Phenom. 7（3） （2012） 253-262] presented the local stability of the endemic equilibrium E＊ of an influenza transmi...A recent paper [W. D. Wang, Modeling adaptive behavior in influenza transmission, Math. Model. Nat. Phenom. 7（3） （2012） 253-262] presented the local stability of the endemic equilibrium E＊ of an influenza transmission model incorporating human mobi- lity behavior. In the present paper, we prove that E＊ is globally stable if the basic reproduction number R0〉 1.展开更多
文摘In the version of this article initially published,the supporting information was incorrectly uploaded,which was a mistake not attributable to the authors.The correct version has now been replaced.
基金supported by the National Key R&D Program of China (2021YFB4000400)the National Natural Science Foundation of China (21988101,22402200)+1 种基金the Youth Innovation Promotion Association CAS (Y2022060)the Liaoning Distinguished Scholars (2024JH3/50100007)。
文摘Establishing supply chains for future ammonia energy systems requires the development of efficient materials and processes for ammonia production under mild conditions.Recent researches disclose unique functionalities of binary alkali and alkaline earth metal hydrides in mediating ammonia synthesis.Thanks to the rich compositional and structural properties of the metalhydrogen system,we herein report that LiBaH_(3),as a narrow band gap perovskite hydride,exhibits a strong response to visible light illumination.Specifically,hydridic hydrogen undergoes reductive elimination of producing H_(2)and creates an electron-rich surface.Such an environment favors dinitrogen fixation to form N-H bonds.Based on this chemical property,a chemical looping ammonia synthesis process mediated by LiBaH_(3)and driven by both photo and thermal energies was proposed and evaluated.This work demonstrates that hydride perovskites are promising candidates for mediating photo-assisted nitrogen fixation reactions.
基金the National Natural Science Foundation of China(82041026,81673275,11961071,91846302)the Huai'an Key Laboratory for Infectious Diseases Control and Prevention(HAP201704).
文摘The global pandemic of 2019 coronavirus disease(COVID-19)is a great assault to public health.Presymptomatic transmission cannot be controlled with measures designed for symptomatic persons,such as isolation.This study aimed to estimate the interval of the transmission generation(TG)and the presymptomatic period of COVID-19,and compare the ftting effects of TG and serial interval(S)based on the SEIHR model incorporating the surveillance data of 3453 cases in 31 provinces.These data were allocated into three distributions and the value of AIC presented that the Weibull distribution fitted well.The mean of TG was 5.2 days(95%C:4.6-5.8).The mean of the presymptomatic period was 2.4 days(95%CI:1.5-3.2).The dynamic model using TG as the generation time performed well.Eight provinces exhibited a basic reproduction number from 2.16 to 3.14.Measures should be taken to control presymptomatic transmission in the COVID-19 pandemic.
文摘Urban underlying surface has been greatly changed with rapid urbanization, considered to be one of the major causes for the destruction of urban natural hydrological processes. This has imposed a huge challenge for stormwater management in cities. There has been a shift from gray water management to green stormwater management thinking. The green stormwater infrastructure （GSI） is regarded as an effective and cost-efficient stormwater management eco-landscape approach. China＇s GSI practice and the development of its theoretical framework are still in the initial stage. This paper presents an innovative framework for stormwater management, integrating green stormwater infrastructure and landscape security patterns on a regional scale based on an urban master plan. The core concept of green stormwater infrastructure eco-planning is to form an interconnected GSI network （i.e., stormwater management landscape security pattern） which consists of the location, portion, size, layout, and structure of GSI so as to efficiently safeguard natural hydrological processes. Shanghai Lin- gang New City, a satellite new town of Shanghai, China was selected as a case study for GSI studies. Simulation analyses of hydrological processes were carried out to identify the critical significant landscape nodes in the high- priority watersheds for stormwater management. GSI should be planned and implemented in these identified landscape nodes. The comprehensive stormwater manage- ment landscape security pattern of Shanghai Lingang New City is designed with consideration of flood control, stormwater control, runoff reduction, water quality protec- tion, and rainwater utilization objectives which couldprovide guidelines for smart growth and sustainable development of this city.
文摘In this paper, we investigate the dynamics of a diffusive predator prey model with Holling-II functional response and the additive Allee effect in prey. We show the local and global asymptotical stability of the positive equilibrium, and give the conditions of the existence of the Hopf bifurcation. By carrying out global qualitative and bifurcation analysis, it is shown that the weak and strong Allee effects in prey can induce different dynamical behavior in the predator-prey model. Furthermore, we use some numerical simulations to illustrate the dynamics of the model. The results may be helpful for controlling and managing the predator-prey system.
基金supported by the National Natural Science Foundation of China(Grant numbers 12071173 and 12171192)Huaian Key Laboratory for Infectious Diseases Control and Prevention,China(HAP201704).
文摘In this paper,based on the statistical data,we investigate the effects of long-term exposure to ambient particulate air pollution on the transmission dynamics of tuberculosis(TB)in Jiangsu,China by studying the threshold dynamics of the TB epidemic model via the statistical data analytically and numerically.The basic reproduction number R_(0)>1 reveals that TB in Jiangsu,China is an endemic disease and will persist for a long time.And the numerical results show that,in order to control the TB in Jiangsu effectively,we must decrease the depuration coefficient of PM10 in the body,the proportion of TB symptomatic infectious by direct transmission,the reactivation rate of the pre-symptomatic infectious and the effect coefficient of PM10 and MTB inhaled of TB transmission,and increase the uptake coefficient,the recovery rate of the symptomatic/pre-symptomatic infectious and the influence coefficient of PM10 on the body of mortality.Our study shows that PM10 is closely related to the incidence of TB,and the effective control efforts are suggested to focus on increasing close-contact distance and wearing protective mask to decrease the influence of PM10 on the TB transmission,which may shed a new light on understanding the environmental drivers to TB.
文摘In this paper, we investigate the spatiotemporal dynamics of a reactio^diffusion epi- demic model with zero-flux boundary conditions. The value of our study lies in two aspects： mathematically, by using maximum principle and the linearized stability theory, a priori estimates of the steady state system and the local asymptotic stability of positive constant solution are given. By using the implicit function theorem, the exis- tence and nonexistence of nonconstant positive steady states are shown. Applying the bifurcation theory, the global bifurcation structure of nonconstant positive steady states is established. Epidemiologically, through numerical simulations, under the conditions of the existence of nonconstant positive steady states, we find that the smaller the space, the easier the pattern formation; the bigger the diffusion, the easier the pattern formation. These results are beneficial to disease control, that is, we must do our best to control the diffusion of the infectious to avoid disease outbreak.
文摘A recent paper [W. D. Wang, Modeling adaptive behavior in influenza transmission, Math. Model. Nat. Phenom. 7（3） （2012） 253-262] presented the local stability of the endemic equilibrium E＊ of an influenza transmission model incorporating human mobi- lity behavior. In the present paper, we prove that E＊ is globally stable if the basic reproduction number R0〉 1.
