The rapid recombination of photogenerated charge carriers and the poor stability of metal sulfides remain bottlenecks limiting their practical applications. In this study, sulfur vacancies were introduced into an S-sc...The rapid recombination of photogenerated charge carriers and the poor stability of metal sulfides remain bottlenecks limiting their practical applications. In this study, sulfur vacancies were introduced into an S-scheme AgIn_(5)S_(8)/Bi_(2)S_(3) heterojunction via an in situ hydrothermal method. The sulfur vacancies induced charge density redistribution within the heterojunction and generated efficient active sites for electrons, thereby creating a localized electron-rich environment. The synergistic effects of the sulfur vacancies, internal electric field, and defect energy levels accelerated the separation and transfer of photogenerated charge carriers via the S-scheme pathway, thereby enhancing the visible-light photocatalytic performance, by achieving a Cr(Ⅵ) reduction efficiency of 99.6%. More importantly, the long-term stability and excellent anti-interference capability of the S-scheme AgIn_(5)S_(8)/Bi_(2)S_(3) heterojunction demonstrate its practical application potential, achieving 98.9% Cr(Ⅵ) removal from real electroplating wastewater and meeting discharge standards. This work provides a theoretical basis for constructing highly-catalytic S-scheme heterojunctions and serves as a promising solution for Cr(VI)-containing electroplating wastewater treatment.展开更多
Photocatalytic and photoelectrocatalytic H_(2)O_(2)production has been identified as a significant pathway within environmental pollution control,green energy,medical treatment,sterilization and disinfection.However,c...Photocatalytic and photoelectrocatalytic H_(2)O_(2)production has been identified as a significant pathway within environmental pollution control,green energy,medical treatment,sterilization and disinfection.However,conventional single-material photocatalysts struggle to fulfill the stringent criteria of high efficiency,stability,cost-effectiveness,and responsiveness to visible light.The elevated recombination rates of photogenerated charge carriers,coupled with the suboptimal utilization of visible light,have collectively constrained the photocatalytic and photoelectrocatalytic H_(2)O_(2)production.Heterojunction catalysts for the production of H_(2)O_(2)has become a focal point of research.This review commences by elucidating the fundaments underlying the photocatalytic and photoelectrocatalytic H_(2)O_(2)production.Subsequently,it delineates the distinctive electron transfer mechanisms of Z-scheme and S-scheme heterojunctions,which exhibit enhanced efficiency in the photocatalytic and photoelectrocatalytic H_(2)O_(2)production,along with a summary of strategies for the improvement of photocatalyst and photoelectrocatalyst performance.Furthermore,this review also outlines the latest fabrication strategies,state-of-the-art in-situ characterization techniques,machine learning and density functional theory(DFT)simulations for Z-scheme or Sscheme catalysts for the photocatalytic and photoelectrocatalytic H_(2)O_(2)production,and briefly describes the multifunctional applications in H_(2)O_(2)production.Ultimately,the review contemplates the prospective developmental trajectories and application potential of these heterojunction configurations for the photocatalytic and photoelectrocatalytic H_(2)O_(2)production.展开更多
Laser powder bed fusion(LPBF)has revolutionized modern manufacturing by enabling high design freedom,rapid prototyping,and tailored mechanical properties.However,optimizing process parameters remains challenging due t...Laser powder bed fusion(LPBF)has revolutionized modern manufacturing by enabling high design freedom,rapid prototyping,and tailored mechanical properties.However,optimizing process parameters remains challenging due to the trial-and-error approaches required to capture subtle parameter-microstructure relationships.This study employed a multi-physics computational framework to investigate the melting and solidification dynamics of magnesium alloy.By integrating the discrete element method for powder bed generation,finite volume method with volume of fluid for melt pool behavior,and phase-field method for microstructural evolution,the critical physical phenomena,including powder melting,molten pool flow,and directional solidification were simulated.The effects of laser power and scanning speed on temperature distribution,melt pool geometry,and dendritic morphology were systematically analyzed.It was revealed that increasing laser power expanded melt pool dimensions and promoted columnar dendritic growth,while high scanning speeds reduced melt pool stability and refined dendritic structures.Furthermore,Marangoni convection and thermal gradients governed solute redistribution,with excessive energy input risking defects such as porosity and elemental evaporation.These insights establish quantitative correlations between process parameters,thermal history,and microstructural characteristics,providing a validated roadmap for LPBF-processed magnesium alloy with tailored performance.展开更多
BACKGROUND The intensive care unit(ICU)is a core hospital unit for critically ill patients.A high-intensity treatment environment,frequent invasive procedures,and isolation from family members often lead to severe psy...BACKGROUND The intensive care unit(ICU)is a core hospital unit for critically ill patients.A high-intensity treatment environment,frequent invasive procedures,and isolation from family members often lead to severe psychological stress reactions in patients,including anxiety,depression,and posttraumatic stress disorder.Studies have reported that up to 50%of patients in the ICU experience varying degrees of psychological disorders,leading to reduced treatment compliance and exacerbated metabolic disorders through neuroendocrine pathways,thereby negatively affecting prognosis.AIM To investigate the influence of psychological nursing interventions on psychological status and all-cause mortality among patients admitted to the ICU.METHODS Data were obtained from 100 patients with nutritional risk in the ICU of the Central Hospital of Enshi Tujia and Miao Autonomous Prefecture,admitted from June 2021 to June 2023.They were randomly divided into two groups(n=50 each)based on nursing intervention:Control and study groups.At follow-up,the Zung Self-Rating Anxiety Scale(SAS)and the Self-Rating Depression Scale(SDS)were used.All-cause mortality and time to death were compared between the two groups.The relationship between psychological status and all-cause mortality was assessed using the Cox proportional hazards regression model.RESULTS There were no statistically significant differences in SAS and SDS scores between the two groups before the nursing intervention(P>0.05).However,after the psychological intervention,the SAS and SDS scores of the study group were significantly lower than those of the control group(P<0.05).The all-cause mortality rates in the study and control groups were 20%and 40%,respectively(P<0.05),indicating that psychological nursing interventions can significantly reduce all-cause mortality and improve clinical outcomes.Cox proportional hazards regression analysis revealed that a good psychological state reduced all-cause mortality(P<0.05).Nursing satisfaction in the study group was significantly higher than that in the control group(P<0.05),indicating a high level of recognition of the psychological intervention.CONCLUSION Psychological nursing interventions can effectively reduce the incidence of anxiety and depression in ICU patients with nutritional risk,improve their psychological state,reduce all-cause mortality,and improve their prognoses.展开更多
BACKGROUND Diabetes and hypertension are metabolic disorders that are becoming more prevalent.Breastfeeding is recommended by the World Health Organization for women who have given birth and have been reported to redu...BACKGROUND Diabetes and hypertension are metabolic disorders that are becoming more prevalent.Breastfeeding is recommended by the World Health Organization for women who have given birth and have been reported to reduce the risk of chronic diseases potentially.However,there is no systematic review to explore the relationship between breastfeeding and diabetes/hypertension by consolidating all available evidence on the topic.AIM To investigate the relationship between breastfeeding and maternal diabetes and hypertension.METHODS This review included comparative studies investigating the association between breastfeeding and the risk of type 2 diabetes or hypertension in parous women.Non-English-language articles,reviews,editorials,letters,and protocols were excluded.The Medline,EMBASE,PubMed,Web of Science,and Cochrane databases were searched until May 6,2024.Risk of bias in non-randomized studies-of exposure was used to assess bias in all the included studies.A meta-analysis was conducted to determine the risk of two chronic lactation-related diseases.RESULTS Eighteen studies were included.Five studies discussed hypertension,12 discussed diabetes,and one discussed both.According to a meta-analysis,lactation significantly reduced the risk of postpartum diabetes in women with gestational diabetes mellitus[hazard ratio=0.64(95%CI:0.47-0.89)].In addition,the meta-analysis produced significant results for postpartum diabetes and hypertension in non-gestational diabetes women,both favoring breastfeeding.However,the risk of bias in most included studies was low or unclear.CONCLUSION Breastfeeding has consistently been shown to be associated with a lower incidence of maternal hypertension and diabetes later in life,even among mothers who experienced gestational diabetes during pregnancy.展开更多
In this paper,we investigate the semi-global robust output regulation problem of a class of nonlinear networked control systems.By the emulation approach,we propose a class of sampled-data output feedback control laws...In this paper,we investigate the semi-global robust output regulation problem of a class of nonlinear networked control systems.By the emulation approach,we propose a class of sampled-data output feedback control laws to solve this problem.In particular,we first develop a general sampled-data dynamic output feedback control law and characterize the closed-loop system by a hybrid system.Then,we design the internal model based on the sampled error output of the system.Based on the internal model principle,we convert the semi-global robust output regulation problem into a semi-global robust stabilization problem of an augmented hybrid system composed of the internal model and the original system.By proposing the sampled error output feedback control law and by means of Lyapunov analysis,we obtain the maximum allowable transmission interval for sampling and show that semi-global robust stabilization of the augmented hybrid system can be achieved by the proposed sampled-data control law and thus leading to the solution of the semi-global robust output regulation problem.Finally,we apply the proposed control approach to two practical applications to verify the effectiveness of the proposed control approach.展开更多
The influence of electronic structure on the performance of catalysts for peroxymonosulfate(PMS)activation remains ambiguous.In this study,the 3d electron configuration of Fe(Ⅲ)in AgFeO_(2) was atomically regulated u...The influence of electronic structure on the performance of catalysts for peroxymonosulfate(PMS)activation remains ambiguous.In this study,the 3d electron configuration of Fe(Ⅲ)in AgFeO_(2) was atomically regulated using cobalt doping.The amount of PMS adsorbed and the catalytic performance were positively correlated with the total effective magnetic moment and the ratios of high-spin Fe(Ⅲ)and eg filling within the catalysts.These 3d electron regulations favor PMS adsorption and electron transfer owing to the lower PMS adsorption energy,increased electronic states near the Fermi level,and reduced dz^(2) orbital occupancy.Benefiting from fine tailoring of the electron configuration,the AgFe_(0.80)Co_(0.20)O_(2) catalyst exhibited outstanding catalytic PMS activation and favorable application potential,achieving efficient pharmaceutical wastewater treatment and more than 80%ofloxacin removal after 72 h of continuous-flow operation.Notably,this study offers a comprehensive understanding for the influence mechanism of electronic structure regulation on PMS activation,providing design guidance for the development of efficient heterogeneous Fenton-like catalytic systems.展开更多
Constructing heterojunction between two semiconductors with matched energy band structure is an effective modification method to obtain excellent photocatalysts.The experimental scheme adopts a simple solvent method t...Constructing heterojunction between two semiconductors with matched energy band structure is an effective modification method to obtain excellent photocatalysts.The experimental scheme adopts a simple solvent method to self-assemble nitrogen doped carbon dots(N-CDs)on the surface of sulfur doped carbon nitride(S-C_(3)N_(4))semiconductor throughπ-πconjugate interaction.Based on this,a novel 0D/2D S-scheme heterojunction N-CDs/S-C_(3)N_(4)hybrid was successfully prepared.The degradation kinetic constants of N-CDs/S-C_(3)N_(4)for rhodamine B(RhB)and p-nitrophenol(PNP)reached 0.23522 and 0.01342 min^(−1),repectively,which were 2.72 and 2.65 times that of S-C_(3)N_(4).The highest photocatalytic hydrogen evolution rate was observed under the simulated sunlight irradiation,which was 2.30 times that of S-C_(3)N_(4).The improvement of photocatalytic performance was mainly based on the formation of the S-scheme heterojunction between S-C_(3)N_(4)and N-CDs.The effects of internal electric field,π-πconjugate interaction and band bending promoted the photogenerated h^(+)and e^(−) with low redox ability to recombine and retained the beneficial h+and e−with strong redox ability,which contributed to the production of more active species of h^(+) and•O_(2)−,therefore the photocatalytic degradation and hydrogen evolution performance were significantly enhanced.展开更多
An adaptive unscented Kalman filter(AUKF)and an augmented state method are employed to estimate the timevarying parameters and states of a kind of nonlinear high-speed objects.A strong tracking filter is employed to i...An adaptive unscented Kalman filter(AUKF)and an augmented state method are employed to estimate the timevarying parameters and states of a kind of nonlinear high-speed objects.A strong tracking filter is employed to improve the tracking ability and robustness of unscented Kalman filter(UKF)when the process noise is inaccuracy,and wavelet transform is used to improve the estimate accuracy by the variance of measurement noise.An augmented square-root framework is utilized to improve the numerical stability and accuracy of UKF.Monte Carlo simulations and applications in the rapid trajectory estimation of hypersonic artillery shells confirm the effectiveness of the proposed method.展开更多
Laser powder bed fusion(LPBF)makes it possible for biodegradable zinc(Zn)to be used to produce customized orthopedic implants.In this research,we investigate the impact of laser power and scanning speed on the develop...Laser powder bed fusion(LPBF)makes it possible for biodegradable zinc(Zn)to be used to produce customized orthopedic implants.In this research,we investigate the impact of laser power and scanning speed on the development of surface quality,relative densification,and texture during LPBF of Zn implants.Increasing laser power was able to decrease melt viscosity and surface tension,which improved the metallurgical bonding between adjacent tracks.Uneven and twisted tracks also became continuous and straight.Scanning speed could controlmolten-pool temperature to restrain grain natural orientation,achieving various crystal orientations and a weakened texture.Importantly,it further avoided the thermal expansion and contraction caused by excessive energy storage and accumulation in the matrix,thus reducing the generation of high-dislocation density.As a result,by selecting a reasonable laser power and scanning speed,the LPBF parts exhibited a flat surface morphology and a high density over 99.5%.Their average hardness,mechanical strength,and elongation reached 50.2 HV,127.8 MPa,and 7.6%,respectively.Additionally,the parts displayed a moderate degradation rate and excellent osteogenic properties.All these results provide a basis for selecting process parameters to optimize the comprehensive properties of LPBF-processed Zn parts for biodegradable applications.展开更多
Connexin subunits are proteins that form gap junction channels, and play an important role in communication between adjacent cells. This review article discusses the function of connexins/hemichannels/gap junctions un...Connexin subunits are proteins that form gap junction channels, and play an important role in communication between adjacent cells. This review article discusses the function of connexins/hemichannels/gap junctions under physiological conditions, and summarizes the findings re-garding the role of connexins/hemichannels/gap junctions in the physiological and pathological mechanisms underlying central nervous system diseases such as brain ischemia, traumatic brain and spinal cord injury, epilepsy, brain and spinal cord tumor, migraine, neuroautoimmune disease, Alzheimer’s disease, Parkinson’s disease, X-linked Charcot-Marie-Tooth disease, Peli-zaeus-Merzbacher-like disease, spastic paraplegia and maxillofacial dysplasia. Connexins are considered to be a potential novel target for protecting the central nervous system.展开更多
Hydroxyapatite(HA)nanoparticles and silver(Ag)nanoparticles are expected to enable desirable bioactivity and antibac-terial properties on biopolymer scaffolds.Nevertheless,interfacial adhesion between HA/Ag and the bi...Hydroxyapatite(HA)nanoparticles and silver(Ag)nanoparticles are expected to enable desirable bioactivity and antibac-terial properties on biopolymer scaffolds.Nevertheless,interfacial adhesion between HA/Ag and the biopolymer is poor due to the large physicochemical differences between these components.In this study,poly L-lactic acid(PLLA)powder was first surface-modified with bioactive polydopamine(PDA)in an alkaline environment.Next,HA and Ag nanoparticles were grown in situ on the PDA-coated PLLA powder,which was then adhered to the porous bone scaffold using a selective laser-sintering process.Results showed that HA and Ag nanoparticles were homogenously distributed in the matrix,with enhanced mechanical properties.Simulated body fluid bioactivity tests showed that the in situ grown HA-endowed scaffold shows excellent bioactivity.In vitro tests confirmed that the scaffold exhibits favorable biocompatibility with human umbilical cord mesenchymal stem cells,as well as strong antibacterial activity against Gram-negative Escherichia coli.Furthermore,in vivo assays indicated that the scaffold promoted bone generation,with a new bone area fraction of 71.8%after 8 weeks’implantation,without inflammation.展开更多
基金supported by the National Natural Science Foundation of China (Grant No.52470078)the Natural Science Foundation of Jiangxi Province (Grant No.20252BAC250042)the Key Laboratory of Jiangxi Province for Persistent Pollutants Prevention Control and Resource Reuse (Grant No.2023SSY02061)。
文摘The rapid recombination of photogenerated charge carriers and the poor stability of metal sulfides remain bottlenecks limiting their practical applications. In this study, sulfur vacancies were introduced into an S-scheme AgIn_(5)S_(8)/Bi_(2)S_(3) heterojunction via an in situ hydrothermal method. The sulfur vacancies induced charge density redistribution within the heterojunction and generated efficient active sites for electrons, thereby creating a localized electron-rich environment. The synergistic effects of the sulfur vacancies, internal electric field, and defect energy levels accelerated the separation and transfer of photogenerated charge carriers via the S-scheme pathway, thereby enhancing the visible-light photocatalytic performance, by achieving a Cr(Ⅵ) reduction efficiency of 99.6%. More importantly, the long-term stability and excellent anti-interference capability of the S-scheme AgIn_(5)S_(8)/Bi_(2)S_(3) heterojunction demonstrate its practical application potential, achieving 98.9% Cr(Ⅵ) removal from real electroplating wastewater and meeting discharge standards. This work provides a theoretical basis for constructing highly-catalytic S-scheme heterojunctions and serves as a promising solution for Cr(VI)-containing electroplating wastewater treatment.
基金the financial support provided by the National Natural Science Foundation of China(Nos.22262024,52470078,62004143)Jiangxi Province Academic and Technical Leader of Major Disciplines(No.20232BCJ22008)+4 种基金the Key Project of Natural Science Foundation of Jiangxi Province(Nos.20232ACB204007)Double Thousand Talent Plan of Jiangxi Provincethe Natural Science Foundation of Jiangxi Province(No.2022ACB203014)the Key R&D Program of Hubei Province(No.2022BAA084)the Innovation Project of Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education(No.LCX202404)。
文摘Photocatalytic and photoelectrocatalytic H_(2)O_(2)production has been identified as a significant pathway within environmental pollution control,green energy,medical treatment,sterilization and disinfection.However,conventional single-material photocatalysts struggle to fulfill the stringent criteria of high efficiency,stability,cost-effectiveness,and responsiveness to visible light.The elevated recombination rates of photogenerated charge carriers,coupled with the suboptimal utilization of visible light,have collectively constrained the photocatalytic and photoelectrocatalytic H_(2)O_(2)production.Heterojunction catalysts for the production of H_(2)O_(2)has become a focal point of research.This review commences by elucidating the fundaments underlying the photocatalytic and photoelectrocatalytic H_(2)O_(2)production.Subsequently,it delineates the distinctive electron transfer mechanisms of Z-scheme and S-scheme heterojunctions,which exhibit enhanced efficiency in the photocatalytic and photoelectrocatalytic H_(2)O_(2)production,along with a summary of strategies for the improvement of photocatalyst and photoelectrocatalyst performance.Furthermore,this review also outlines the latest fabrication strategies,state-of-the-art in-situ characterization techniques,machine learning and density functional theory(DFT)simulations for Z-scheme or Sscheme catalysts for the photocatalytic and photoelectrocatalytic H_(2)O_(2)production,and briefly describes the multifunctional applications in H_(2)O_(2)production.Ultimately,the review contemplates the prospective developmental trajectories and application potential of these heterojunction configurations for the photocatalytic and photoelectrocatalytic H_(2)O_(2)production.
基金supported by the Ministry of Science and Technology of the People’s Republic of China(2025YFE0110100)Xjenza Malta through SINOMALTA-2024-11(Science and Technology Cooperation)+8 种基金National Natural Science Foundation of China(52165043)Jiang Xi Provincial Natural Science Foundation of China(20224ACB214008,20232BAB214007)Jiangxi Provincial Cultivation Program for Academic and Technical Leaders of Major Subjects(20225BCJ23008)Excellent Research and Innovation Team in Anhui Province(2024AH010031)The University Synergy Innovation Program of Anhui Province(GXXT-2023-025,GXXT-2023-026)Anhui Province Science and Technology Innovation Tackle Plan Project of Anhui Province(202423i08050011)Anhui Provincial Natural Science Foundation of China(2308085ME171)The Project for Cultivating Academic(or Disciplinary)Leaders of Anhui University(DTR2024044)Talent research start-up fund project(2024tlxyrc056).
文摘Laser powder bed fusion(LPBF)has revolutionized modern manufacturing by enabling high design freedom,rapid prototyping,and tailored mechanical properties.However,optimizing process parameters remains challenging due to the trial-and-error approaches required to capture subtle parameter-microstructure relationships.This study employed a multi-physics computational framework to investigate the melting and solidification dynamics of magnesium alloy.By integrating the discrete element method for powder bed generation,finite volume method with volume of fluid for melt pool behavior,and phase-field method for microstructural evolution,the critical physical phenomena,including powder melting,molten pool flow,and directional solidification were simulated.The effects of laser power and scanning speed on temperature distribution,melt pool geometry,and dendritic morphology were systematically analyzed.It was revealed that increasing laser power expanded melt pool dimensions and promoted columnar dendritic growth,while high scanning speeds reduced melt pool stability and refined dendritic structures.Furthermore,Marangoni convection and thermal gradients governed solute redistribution,with excessive energy input risking defects such as porosity and elemental evaporation.These insights establish quantitative correlations between process parameters,thermal history,and microstructural characteristics,providing a validated roadmap for LPBF-processed magnesium alloy with tailored performance.
文摘BACKGROUND The intensive care unit(ICU)is a core hospital unit for critically ill patients.A high-intensity treatment environment,frequent invasive procedures,and isolation from family members often lead to severe psychological stress reactions in patients,including anxiety,depression,and posttraumatic stress disorder.Studies have reported that up to 50%of patients in the ICU experience varying degrees of psychological disorders,leading to reduced treatment compliance and exacerbated metabolic disorders through neuroendocrine pathways,thereby negatively affecting prognosis.AIM To investigate the influence of psychological nursing interventions on psychological status and all-cause mortality among patients admitted to the ICU.METHODS Data were obtained from 100 patients with nutritional risk in the ICU of the Central Hospital of Enshi Tujia and Miao Autonomous Prefecture,admitted from June 2021 to June 2023.They were randomly divided into two groups(n=50 each)based on nursing intervention:Control and study groups.At follow-up,the Zung Self-Rating Anxiety Scale(SAS)and the Self-Rating Depression Scale(SDS)were used.All-cause mortality and time to death were compared between the two groups.The relationship between psychological status and all-cause mortality was assessed using the Cox proportional hazards regression model.RESULTS There were no statistically significant differences in SAS and SDS scores between the two groups before the nursing intervention(P>0.05).However,after the psychological intervention,the SAS and SDS scores of the study group were significantly lower than those of the control group(P<0.05).The all-cause mortality rates in the study and control groups were 20%and 40%,respectively(P<0.05),indicating that psychological nursing interventions can significantly reduce all-cause mortality and improve clinical outcomes.Cox proportional hazards regression analysis revealed that a good psychological state reduced all-cause mortality(P<0.05).Nursing satisfaction in the study group was significantly higher than that in the control group(P<0.05),indicating a high level of recognition of the psychological intervention.CONCLUSION Psychological nursing interventions can effectively reduce the incidence of anxiety and depression in ICU patients with nutritional risk,improve their psychological state,reduce all-cause mortality,and improve their prognoses.
基金Supported by the 2023 Guangzhou Municipal Science and Technology Bureau Project,No.2023A03J0873.
文摘BACKGROUND Diabetes and hypertension are metabolic disorders that are becoming more prevalent.Breastfeeding is recommended by the World Health Organization for women who have given birth and have been reported to reduce the risk of chronic diseases potentially.However,there is no systematic review to explore the relationship between breastfeeding and diabetes/hypertension by consolidating all available evidence on the topic.AIM To investigate the relationship between breastfeeding and maternal diabetes and hypertension.METHODS This review included comparative studies investigating the association between breastfeeding and the risk of type 2 diabetes or hypertension in parous women.Non-English-language articles,reviews,editorials,letters,and protocols were excluded.The Medline,EMBASE,PubMed,Web of Science,and Cochrane databases were searched until May 6,2024.Risk of bias in non-randomized studies-of exposure was used to assess bias in all the included studies.A meta-analysis was conducted to determine the risk of two chronic lactation-related diseases.RESULTS Eighteen studies were included.Five studies discussed hypertension,12 discussed diabetes,and one discussed both.According to a meta-analysis,lactation significantly reduced the risk of postpartum diabetes in women with gestational diabetes mellitus[hazard ratio=0.64(95%CI:0.47-0.89)].In addition,the meta-analysis produced significant results for postpartum diabetes and hypertension in non-gestational diabetes women,both favoring breastfeeding.However,the risk of bias in most included studies was low or unclear.CONCLUSION Breastfeeding has consistently been shown to be associated with a lower incidence of maternal hypertension and diabetes later in life,even among mothers who experienced gestational diabetes during pregnancy.
基金supported in part by the National Science and Technology Major Project(2021ZD0112600)the National Natural Science Foundation of China(62373058),Beijing Natural Science Foundation(L233003)+1 种基金the National Science Fund for Distinguished Young Scholars of China(62025301)the Basic Science Center Programs of National Nature Science Foundation of China(62088101).
文摘In this paper,we investigate the semi-global robust output regulation problem of a class of nonlinear networked control systems.By the emulation approach,we propose a class of sampled-data output feedback control laws to solve this problem.In particular,we first develop a general sampled-data dynamic output feedback control law and characterize the closed-loop system by a hybrid system.Then,we design the internal model based on the sampled error output of the system.Based on the internal model principle,we convert the semi-global robust output regulation problem into a semi-global robust stabilization problem of an augmented hybrid system composed of the internal model and the original system.By proposing the sampled error output feedback control law and by means of Lyapunov analysis,we obtain the maximum allowable transmission interval for sampling and show that semi-global robust stabilization of the augmented hybrid system can be achieved by the proposed sampled-data control law and thus leading to the solution of the semi-global robust output regulation problem.Finally,we apply the proposed control approach to two practical applications to verify the effectiveness of the proposed control approach.
文摘The influence of electronic structure on the performance of catalysts for peroxymonosulfate(PMS)activation remains ambiguous.In this study,the 3d electron configuration of Fe(Ⅲ)in AgFeO_(2) was atomically regulated using cobalt doping.The amount of PMS adsorbed and the catalytic performance were positively correlated with the total effective magnetic moment and the ratios of high-spin Fe(Ⅲ)and eg filling within the catalysts.These 3d electron regulations favor PMS adsorption and electron transfer owing to the lower PMS adsorption energy,increased electronic states near the Fermi level,and reduced dz^(2) orbital occupancy.Benefiting from fine tailoring of the electron configuration,the AgFe_(0.80)Co_(0.20)O_(2) catalyst exhibited outstanding catalytic PMS activation and favorable application potential,achieving efficient pharmaceutical wastewater treatment and more than 80%ofloxacin removal after 72 h of continuous-flow operation.Notably,this study offers a comprehensive understanding for the influence mechanism of electronic structure regulation on PMS activation,providing design guidance for the development of efficient heterogeneous Fenton-like catalytic systems.
基金support from the National Natural Science Foundation of China (Nos. 51962023, 51772139)the Natural Science Foundation of Jiangxi Province, China (No. 20192ACBL21047, 20212BAB204045)+1 种基金the Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle (Nanchang Hangkong University) (No. ES202002077)the 2019 Project of Liaoning Education Department (No. 2019LNJC20)
文摘Constructing heterojunction between two semiconductors with matched energy band structure is an effective modification method to obtain excellent photocatalysts.The experimental scheme adopts a simple solvent method to self-assemble nitrogen doped carbon dots(N-CDs)on the surface of sulfur doped carbon nitride(S-C_(3)N_(4))semiconductor throughπ-πconjugate interaction.Based on this,a novel 0D/2D S-scheme heterojunction N-CDs/S-C_(3)N_(4)hybrid was successfully prepared.The degradation kinetic constants of N-CDs/S-C_(3)N_(4)for rhodamine B(RhB)and p-nitrophenol(PNP)reached 0.23522 and 0.01342 min^(−1),repectively,which were 2.72 and 2.65 times that of S-C_(3)N_(4).The highest photocatalytic hydrogen evolution rate was observed under the simulated sunlight irradiation,which was 2.30 times that of S-C_(3)N_(4).The improvement of photocatalytic performance was mainly based on the formation of the S-scheme heterojunction between S-C_(3)N_(4)and N-CDs.The effects of internal electric field,π-πconjugate interaction and band bending promoted the photogenerated h^(+)and e^(−) with low redox ability to recombine and retained the beneficial h+and e−with strong redox ability,which contributed to the production of more active species of h^(+) and•O_(2)−,therefore the photocatalytic degradation and hydrogen evolution performance were significantly enhanced.
基金supported by the National Natural Science Foundation of China(61304254)the National Science Foundation for Distinguished Young Scholars of China(60925011)the Provincial and Ministerial Key Fund of China(9140A07010511BQ0105)
文摘An adaptive unscented Kalman filter(AUKF)and an augmented state method are employed to estimate the timevarying parameters and states of a kind of nonlinear high-speed objects.A strong tracking filter is employed to improve the tracking ability and robustness of unscented Kalman filter(UKF)when the process noise is inaccuracy,and wavelet transform is used to improve the estimate accuracy by the variance of measurement noise.An augmented square-root framework is utilized to improve the numerical stability and accuracy of UKF.Monte Carlo simulations and applications in the rapid trajectory estimation of hypersonic artillery shells confirm the effectiveness of the proposed method.
基金The National Natural Science Foundation of China(Nos.51935014,52165043,52105352,and 82072084)Jiangxi Provincial Natural Science Foundation of China(No.20212BAB214026)+1 种基金The Project of State Key Laboratory of High Performance Complex ManufacturingThe Project of Science and Technology of Jiangxi Provincial Education Department(No.GJJ210835).
文摘Laser powder bed fusion(LPBF)makes it possible for biodegradable zinc(Zn)to be used to produce customized orthopedic implants.In this research,we investigate the impact of laser power and scanning speed on the development of surface quality,relative densification,and texture during LPBF of Zn implants.Increasing laser power was able to decrease melt viscosity and surface tension,which improved the metallurgical bonding between adjacent tracks.Uneven and twisted tracks also became continuous and straight.Scanning speed could controlmolten-pool temperature to restrain grain natural orientation,achieving various crystal orientations and a weakened texture.Importantly,it further avoided the thermal expansion and contraction caused by excessive energy storage and accumulation in the matrix,thus reducing the generation of high-dislocation density.As a result,by selecting a reasonable laser power and scanning speed,the LPBF parts exhibited a flat surface morphology and a high density over 99.5%.Their average hardness,mechanical strength,and elongation reached 50.2 HV,127.8 MPa,and 7.6%,respectively.Additionally,the parts displayed a moderate degradation rate and excellent osteogenic properties.All these results provide a basis for selecting process parameters to optimize the comprehensive properties of LPBF-processed Zn parts for biodegradable applications.
基金supported by the National Natural Science Foundation of China(General Program),No.81271293the National Science Foundation for Young Scientists of China,No.81000490
文摘Connexin subunits are proteins that form gap junction channels, and play an important role in communication between adjacent cells. This review article discusses the function of connexins/hemichannels/gap junctions under physiological conditions, and summarizes the findings re-garding the role of connexins/hemichannels/gap junctions in the physiological and pathological mechanisms underlying central nervous system diseases such as brain ischemia, traumatic brain and spinal cord injury, epilepsy, brain and spinal cord tumor, migraine, neuroautoimmune disease, Alzheimer’s disease, Parkinson’s disease, X-linked Charcot-Marie-Tooth disease, Peli-zaeus-Merzbacher-like disease, spastic paraplegia and maxillofacial dysplasia. Connexins are considered to be a potential novel target for protecting the central nervous system.
基金This study was supported by the following funds:(1)National Natural Science Foundation of China(Nos.51935014,82072084,and 81871498)(2)Jiangxi Provincial Natural Science Foundation of China(Nos.20192ACB20005 and 2020ACB214004)+6 种基金(3)The Provincial Key R&D Projects of Jiangxi(No.20201BBE51012)(4)Guangdong Province Higher Vocational Colleges&Schools Pearl River Scholar Funded Scheme(2018)(5)Shenzhen Science and Technology Plan Project(No.JCYJ20170817112445033)(6)Innovation Team Project on University of Guangdong Province(No.2018GKCXTD001)(7)Technology Innovation Platform Project of Shenzhen Institute of Information Technology 2020(No.PT2020E002)(8)Open Research Fund of Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology(9)China Postdoctoral Science Foundation(No.2020M682114).
文摘Hydroxyapatite(HA)nanoparticles and silver(Ag)nanoparticles are expected to enable desirable bioactivity and antibac-terial properties on biopolymer scaffolds.Nevertheless,interfacial adhesion between HA/Ag and the biopolymer is poor due to the large physicochemical differences between these components.In this study,poly L-lactic acid(PLLA)powder was first surface-modified with bioactive polydopamine(PDA)in an alkaline environment.Next,HA and Ag nanoparticles were grown in situ on the PDA-coated PLLA powder,which was then adhered to the porous bone scaffold using a selective laser-sintering process.Results showed that HA and Ag nanoparticles were homogenously distributed in the matrix,with enhanced mechanical properties.Simulated body fluid bioactivity tests showed that the in situ grown HA-endowed scaffold shows excellent bioactivity.In vitro tests confirmed that the scaffold exhibits favorable biocompatibility with human umbilical cord mesenchymal stem cells,as well as strong antibacterial activity against Gram-negative Escherichia coli.Furthermore,in vivo assays indicated that the scaffold promoted bone generation,with a new bone area fraction of 71.8%after 8 weeks’implantation,without inflammation.
