This article aims to explore the teaching mode of using MWorks simulation software to promote teaching in circuit fundamentals courses in vocational colleges through competitions.By analyzing the limitations of tradit...This article aims to explore the teaching mode of using MWorks simulation software to promote teaching in circuit fundamentals courses in vocational colleges through competitions.By analyzing the limitations of traditional teaching,this article elaborates on the functional advantages of MWorks software and its specific application methods in promoting teaching through competitions,including how to combine skill competitions for teaching design,organizing internal selection and training,and other aspects.Practice has shown that this model effectively enhances students’professional skills,innovation ability,and teamwork spirit,while also promoting the improvement of teachers’teaching level.Finally,the problems encountered during the application process were reflected upon,and improvement suggestions were proposed,providing a reference for relevant teaching reforms in vocational colleges.展开更多
Hydrogen evolution reaction(HER)is unavoidable in many electrochemical synthesis systems,such as CO_(2)reduction,N2reduction,and H_(2)O_(2)synthesis.It makes those electrochemical reactions with multiple electron-prot...Hydrogen evolution reaction(HER)is unavoidable in many electrochemical synthesis systems,such as CO_(2)reduction,N2reduction,and H_(2)O_(2)synthesis.It makes those electrochemical reactions with multiple electron-proton transfers more complex when determining kinetics and mass transfer information.Understanding how HER competes with other electrochemical reduction reactions is crucial for both fundamental studies and system performance improvements.In this study,we employed the oxygen reduction reaction(ORR)as a model reaction to investigate HER competition on a polycrystalline-Au surface,using a rotating ring and disk electrode.It’s proved that water molecules serve as the proton source for ORR in alkaline,neutral,and even acidic electrolytes,and a 4-electron process can be achieved when the overpotential is sufficiently high.The competition from H⁺reduction becomes noticeable at the H⁺concentration higher than 2 mmol L^(–1)and intensi-fies as the H^(+)concentration increases.Based on the electrochemical results,we obtained an equivalent circuit diagram for the ORR system with competition from the H+reduction reaction,showing that these reactions occur in parallel and compete with each other.Electrochemical impedance spectroscopy measurements further confirm this argument.Additionally,we discover that the contribution of H+mass transfer to the total H^(+)reduction current is significant and comparable to the kinetic current.We believe this work will deepen our understanding of HER and its competition in electrochemical reduction systems.展开更多
Purpose China Adolescents Science and Technology Innovation Contest(CASTIC)has created a better experimental environment for science education than that provided by formal schooling.In order to assess its educational ...Purpose China Adolescents Science and Technology Innovation Contest(CASTIC)has created a better experimental environment for science education than that provided by formal schooling.In order to assess its educational effect,this study examines different talent development models resulting from CASTIC,as well as learning environment and processes it fosters.Design/Approach/Methods This multi-case study sampled teachers and students from different schools that participated in the Shanghai division of CASTIC,and then analyzed the implementation process of CASTIC as well as various models it formed for talent development.Findings This study argues that,by constructing multiple settings for learning involving schools,science clubs,and competitions,CASTIC enables schools to establish diversified talent development models based on process motivation.As structural problems arising from the inadequacy of educational resources for science and technology innovation continue to limit the educational effectiveness of these competitions,a series of curriculum reforms and institutional designs are necessary to fully harness the educational power of science and technology innovation competitions.Originality/Value This study provides an important reference for understanding the talent training mechanism of science competition and exploring its future development.展开更多
基金MWORKS University Application Verification Project(BX2024C081).
文摘This article aims to explore the teaching mode of using MWorks simulation software to promote teaching in circuit fundamentals courses in vocational colleges through competitions.By analyzing the limitations of traditional teaching,this article elaborates on the functional advantages of MWorks software and its specific application methods in promoting teaching through competitions,including how to combine skill competitions for teaching design,organizing internal selection and training,and other aspects.Practice has shown that this model effectively enhances students’professional skills,innovation ability,and teamwork spirit,while also promoting the improvement of teachers’teaching level.Finally,the problems encountered during the application process were reflected upon,and improvement suggestions were proposed,providing a reference for relevant teaching reforms in vocational colleges.
文摘Hydrogen evolution reaction(HER)is unavoidable in many electrochemical synthesis systems,such as CO_(2)reduction,N2reduction,and H_(2)O_(2)synthesis.It makes those electrochemical reactions with multiple electron-proton transfers more complex when determining kinetics and mass transfer information.Understanding how HER competes with other electrochemical reduction reactions is crucial for both fundamental studies and system performance improvements.In this study,we employed the oxygen reduction reaction(ORR)as a model reaction to investigate HER competition on a polycrystalline-Au surface,using a rotating ring and disk electrode.It’s proved that water molecules serve as the proton source for ORR in alkaline,neutral,and even acidic electrolytes,and a 4-electron process can be achieved when the overpotential is sufficiently high.The competition from H⁺reduction becomes noticeable at the H⁺concentration higher than 2 mmol L^(–1)and intensi-fies as the H^(+)concentration increases.Based on the electrochemical results,we obtained an equivalent circuit diagram for the ORR system with competition from the H+reduction reaction,showing that these reactions occur in parallel and compete with each other.Electrochemical impedance spectroscopy measurements further confirm this argument.Additionally,we discover that the contribution of H+mass transfer to the total H^(+)reduction current is significant and comparable to the kinetic current.We believe this work will deepen our understanding of HER and its competition in electrochemical reduction systems.
基金part of the phased achievements of“Recommendations for Enhancing the Effectiveness of Science and Technology Innovation Competitions for Adolescents in Nurturing a Reserve of Young Talents in Science and Technology,”a project supported by the Shanghai Association for Science and Technology in 2019。
文摘Purpose China Adolescents Science and Technology Innovation Contest(CASTIC)has created a better experimental environment for science education than that provided by formal schooling.In order to assess its educational effect,this study examines different talent development models resulting from CASTIC,as well as learning environment and processes it fosters.Design/Approach/Methods This multi-case study sampled teachers and students from different schools that participated in the Shanghai division of CASTIC,and then analyzed the implementation process of CASTIC as well as various models it formed for talent development.Findings This study argues that,by constructing multiple settings for learning involving schools,science clubs,and competitions,CASTIC enables schools to establish diversified talent development models based on process motivation.As structural problems arising from the inadequacy of educational resources for science and technology innovation continue to limit the educational effectiveness of these competitions,a series of curriculum reforms and institutional designs are necessary to fully harness the educational power of science and technology innovation competitions.Originality/Value This study provides an important reference for understanding the talent training mechanism of science competition and exploring its future development.
