Variant selection under specific applied stresses during precipitation of a plates from prior-βmatrix in Ti-6 Al-4 V was investigated by 3 D phase field simulations.The model incorporates the Burgers transformation p...Variant selection under specific applied stresses during precipitation of a plates from prior-βmatrix in Ti-6 Al-4 V was investigated by 3 D phase field simulations.The model incorporates the Burgers transformation path fromβto a phase,with consideration of interfacial energy anisotropy,externally applied stresses and elastic interactions among a variants andβmatrix.The Gibbs free energy and atomic mobility data are taken from available thermodynamic and kinetic databases.It was found that external stresses have a profound influence on variant selection,and the selection has a sensitive dependence,as evidenced by both interaction energy calculations and phase field simulations.Compared with normal stresses,shear stresses applied in certain directions were found more effective in accelerating the transformation,with a stronger preference to fewer variants.The volume fractions of various a variants and the final microstructure were determined by both the external stress and the elastic interaction among different variants.The a clusters formed by variants with Type2 misorientation([11-20]/60°)relation were found more favored than those with Type4([-1055-3]/63.26°)under certain applied tensile stress such as along<111>β.The mechanical properties of different microstructures from our phase field simulation under different conditions were calculated for different loading conditions,utilizing crystal plastic finite element simulation.The mechanical behavior of the various microstructures from phase field simulation can be evaluated well before the alloys are fabricated,and therefore it is possible to select microstructure for optimizing the mechanical properties of the alloy through thermomechanical processing based on the two types of simulations.展开更多
New research and development(R&D)institutions are an important part of the national innovation system,playing an important role in promoting the transformation of scientific and technological achievements.In recen...New research and development(R&D)institutions are an important part of the national innovation system,playing an important role in promoting the transformation of scientific and technological achievements.In recent years,new R&D institutions have gradually become the driving force of innovation-driven development in China.Taking new R&D institutions in Zhejiang Province as the research object,this paper studies the internal talent training path and performance evaluation mechanism of new R&D institutions in Zhejiang Province by using the literature research method,comparison method,case verification method,and other methods.The investigation results show that there are problems such as lack of material and spiritual support and neglect of the absorption of local talents in the internal talent training,and there are problems such as unclear standards,insufficient data,and opaque processes in the performance evaluation mechanism,which greatly affect the establishment and improvement of the performance evaluation mechanism.Given the above problems,this paper puts forward a forward-looking,oriented,flexible,and compatible talent training path and performance evaluation mechanism,hoping to optimize the effective internal talent training path of new R&D institutions,improve the evaluation performance,and promote healthy development of new R&D institutions in Zhejiang Province.展开更多
The construction of curriculum ideological and political education mechanism in colleges and universities in China has begun to take effect.In view of the differences in the key points of different colleges and univer...The construction of curriculum ideological and political education mechanism in colleges and universities in China has begun to take effect.In view of the differences in the key points of different colleges and universities in the construction of curriculum ideological and political education mechanism,the quality evaluation of curriculum ideological and political education mechanism is particularly important.However,the quality evaluation mechanism is related to ability,fairness,and potential.It is essential to assume the effectiveness of moral education in college curriculum ideological and political education as the benchmark,adhere to positioning experts,teachers,and students as the key elements of the main body of the evaluation mechanism,as well as establish a diversified quality evaluation standard system based on the teaching management,infrastructure,and moral education effectiveness.Building a scientific and multi-dimensional quality evaluation mechanism for ideological and political education in colleges and universities would promote the connotative development of ideological and political education in courses.展开更多
Lattice structures have attracted extensive attention in the field of engineering materials due to their characteristics of lightweight and high strength.This paper combines topology optimization with additive manufac...Lattice structures have attracted extensive attention in the field of engineering materials due to their characteristics of lightweight and high strength.This paper combines topology optimization with additive manufacturing to investigate how pore shape in Triply Periodic Minimal Surface(TPMS)structures affects mechanical properties and energy absorption performance.The periodic lattice structures(Triangle lattice,rectangle lattice and Rectangle lattice)and aperiodic mixed structures are designed,including a variety of lattice structures such as circle-circle and triangle-triangle(CCTT),triangle-triangle and rectangle-rectangle(TTRR),circle-circle and rectangle-rectangle(CCRR),triangle-circle-circle-triangle(TCCT),rectangle-triangle-triangle-rectangle(RTTR)and rectangle-circle-circle-rectangle(RCCR).The anisotropy of the unit cells is compared by using the homogenization method.The deformation modes,mechanical properties,and energy absorption efficiency of lattice structures are evaluated systematically by finite element analysis and compression experiments.The results demonstrate that the circle lattice exhibits significantly superior performance in Young’s modulus,compressive strength,toughness,and energy absorption characteristics compared to the triangle lattice and the rectangle lattice.Among aperiodic structures,TCCT shows better comprehensive mechanical properties,while TTRR exhibits relatively inferior performance.The periodic structures possess overall superior mechanical performance.This study demonstrates that the mechanical properties and energy absorption characteristics can be optimized by controlling the pore shape of TPMS lattice structures.This provides an important insight into lightweight structure design in the engineering field.展开更多
Early childhood character education is a critical element in shaping an individual’s moral foundation and fostering a sense of social responsibility.It plays a fundamental role in overall personal development.Althoug...Early childhood character education is a critical element in shaping an individual’s moral foundation and fostering a sense of social responsibility.It plays a fundamental role in overall personal development.Although China’s early childhood character education has made progress with the support of policies and practical exploration,it still faces challenges such as the homogenization of educational models,a formalization of home-kindergarten cooperation,a single-dimensional evaluation system,and a need for further improvement in teachers’professional competence in character education.This paper draws on core theories of character education(e.g.,social learning theory and cognitive moral development theory)and incorporates representative case studies to conduct an in-depth analysis of the current landscape and associated challenges.It proposes innovative approaches,which include establishing a“threefold”system of implementation,enhancing the mechanisms for home-kindergarten co-education,optimizing and ensuring a multidimensional and dynamic evaluation system,equitably allocating teaching resources,and expanding the social support networks.The aim is to offer theoretical reference and practical solutions to promote the scientific and systematic development of early childhood character education.展开更多
Pneumatic actuators and electric actuators have almost been applied to all manufacturing industries. The two kinds of actuators can replace each other in most fields, such as the point to point transmission occasion a...Pneumatic actuators and electric actuators have almost been applied to all manufacturing industries. The two kinds of actuators can replace each other in most fields, such as the point to point transmission occasion and some rotating occasions. However, there are very few research results about the advantages and disadvantages of two kinds of actuators under the same working conditions so far. In this paper, a novel comprehensive assessment method, named as overall life cycle comprehensive assessment （OLCCA）, is proposed for comparison and assessment of pneumatic and electric actuators. OLCCA contains mechanical properties evaluation （MPE）, life cycle cost analysis based on users （LCCABOU） and life cycle environmental impact analysis （LCEIA） algorithm in order to solve three difficult problems： mechanical properties assessment, cost analysis and environmental impact assessment about actuators. The mechanical properties evaluation of actuators is a multi-objective optimization problem. The fuzzy data quantification and information entropy methods are combined to establish MPE algorithm of actuators. Two kinds of pneumatic actuators and electric actuators with similar bearing capacity and similar work stroke were taken for example to verify the correctness of MPE algorithm. The case study of MPE algorithm for actuators verified its correctness. LCCABOU for actuators is also set up. Considering cost complex structure of pneumatic actuators, public device cost even method （PDCEM） is firstly presented to solve cost division of public devices such as compressors, aftercooler, receivers, etc. LCCABOU method is also effective and verified by the three groups of pneumatic actuators and electric actuators. Finally, LCEIA model of actuators is established for the environmental impact assessment of actuators. LCEIA data collection method and model establishment procedure for actuators are also put forward. With Simapro 7, LCEIA comparison results of six actuators can be obtained： Fossil fuels are the major environmental factor of pneumatic and electric actuators; Environmental impact of electric actuator is large than one of pneumatic actuator under the similar mechanical properties and working conditions of pneumatic and electric actuators. The results are correct and correspond with the actual mechanical properties of actuators. This paper proposes a comprehensive evaluation method of the actuators, which can solve the critical problem that similar electromechanical products are very difficult to be compared with each other from the angle of performance, cost and environment impact.展开更多
Although the observed progress in the cardiovascular disease treatment, the incidence of new and recurrent coronary artery disease remains elevated and constitutes the leading cause of death in the developed countries...Although the observed progress in the cardiovascular disease treatment, the incidence of new and recurrent coronary artery disease remains elevated and constitutes the leading cause of death in the developed countries. Three-quarters of deaths due to cardiovascular diseases could be prevented with adequate changes in lifestyle, including increased daily physical activity. New evidence confirms that there is an inverse dose-response relationship between physical activity and cardiovascular disease and mortality risk. However, participation in moderate to vigorous physical activity may not fully attenuate the independent effect of sedentary activities on increased risk for cardiovascular diseases. Physical activity also plays an important role in secondary prevention of cardiovascular diseases by reducing the impact of the disease, slowing its progress and preventing recurrence. Nonetheless, most of eligible cardiovascular patients still do not benefit from secondary prevention/cardiac rehabilitation programs. The present review draws attention to the importance of physical activity in the primary and secondary prevention of cardiovascular diseases. It also addresses the mechanisms by which physical activity and regular exercise can improve cardiovascular health and reduce the burden of the disease.展开更多
Evaluation is a form of communication between teachers and students in teaching. Teachers can guide students' progress and growth by pointing out students' advantages and problems. Making good use of evaluatio...Evaluation is a form of communication between teachers and students in teaching. Teachers can guide students' progress and growth by pointing out students' advantages and problems. Making good use of evaluation mechanism can stimulate students' learning enthusiasm and improve students' learning enthusiasm. It is helpful to strengthen the teaching effect and improve students' comprehensive quality. This paper will talk about how to evaluate students in low-grade mathematics classroom teaching activities in rural primary schools.展开更多
The rapid advancement of information technology poses significant pedagogical challenges for basic computer courses in local colleges and universities.This study proposes a comprehensive framework for instructional in...The rapid advancement of information technology poses significant pedagogical challenges for basic computer courses in local colleges and universities.This study proposes a comprehensive framework for instructional innovation,encompassing the restructuring of course content,enrichment of teaching resources,reformulation of instructional methods,and the establishment of feedback channels,as well as a comprehensive framework for optimizing assessment mechanisms.The implementation of this framework has yielded remarkable outcomes,including heightened classroom engagement and academic rigor as well as an overall enhancement in students’critical thinking and practical skills.These transformative changes have propelled basic computer courses in local higher education institutions to a new stage while offering valuable insights for future pedagogical reforms.展开更多
1 Introduction Existing university research evaluation mechanisms face issues like unclear value orientation,poor classification,suboptimal expert selection,and unscientific organization[1].A comprehensive,scientific ...1 Introduction Existing university research evaluation mechanisms face issues like unclear value orientation,poor classification,suboptimal expert selection,and unscientific organization[1].A comprehensive,scientific evaluation system is essential for advancing higher education.Motivation.Traditional evaluation methods struggle to keep up with the increasing complexity and variety of evaluation indicators[2].Data mining techniques,such as cooccurrence analysis and clustering,have been effective in uncovering hidden patterns in large datasets,addressing the limitations of traditional qualitative methods[3−5].However,research applying these techniques in this field remains limited.展开更多
On the basis of analyzing the shortage of scale measure of the current AHP, and following base principIe of two comparison: principle of reward-punishment and principle of conversion, translation function and concilia...On the basis of analyzing the shortage of scale measure of the current AHP, and following base principIe of two comparison: principle of reward-punishment and principle of conversion, translation function and conciliation coefficient have been structured. This article advances a new measure which structuring translation function and conciliation coefficient. The result of application of improved AHP on the synthesis evaluation of agricultural mechanization is satisfactory.展开更多
基金financially supported by the National Key Research and Development Program of China(Nos.2016YFB0701304 and 2016YFC0304200)the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDC01040100)+1 种基金the Special Project on Information Technology of the Chinese Academy of Sciences(No.XXH13506-304)the CAS-Shenyang Supercomputing Center and the Doctoral Scientific Research Foundation of Liaoning Province(No.20180540133)。
文摘Variant selection under specific applied stresses during precipitation of a plates from prior-βmatrix in Ti-6 Al-4 V was investigated by 3 D phase field simulations.The model incorporates the Burgers transformation path fromβto a phase,with consideration of interfacial energy anisotropy,externally applied stresses and elastic interactions among a variants andβmatrix.The Gibbs free energy and atomic mobility data are taken from available thermodynamic and kinetic databases.It was found that external stresses have a profound influence on variant selection,and the selection has a sensitive dependence,as evidenced by both interaction energy calculations and phase field simulations.Compared with normal stresses,shear stresses applied in certain directions were found more effective in accelerating the transformation,with a stronger preference to fewer variants.The volume fractions of various a variants and the final microstructure were determined by both the external stress and the elastic interaction among different variants.The a clusters formed by variants with Type2 misorientation([11-20]/60°)relation were found more favored than those with Type4([-1055-3]/63.26°)under certain applied tensile stress such as along<111>β.The mechanical properties of different microstructures from our phase field simulation under different conditions were calculated for different loading conditions,utilizing crystal plastic finite element simulation.The mechanical behavior of the various microstructures from phase field simulation can be evaluated well before the alloys are fabricated,and therefore it is possible to select microstructure for optimizing the mechanical properties of the alloy through thermomechanical processing based on the two types of simulations.
文摘New research and development(R&D)institutions are an important part of the national innovation system,playing an important role in promoting the transformation of scientific and technological achievements.In recent years,new R&D institutions have gradually become the driving force of innovation-driven development in China.Taking new R&D institutions in Zhejiang Province as the research object,this paper studies the internal talent training path and performance evaluation mechanism of new R&D institutions in Zhejiang Province by using the literature research method,comparison method,case verification method,and other methods.The investigation results show that there are problems such as lack of material and spiritual support and neglect of the absorption of local talents in the internal talent training,and there are problems such as unclear standards,insufficient data,and opaque processes in the performance evaluation mechanism,which greatly affect the establishment and improvement of the performance evaluation mechanism.Given the above problems,this paper puts forward a forward-looking,oriented,flexible,and compatible talent training path and performance evaluation mechanism,hoping to optimize the effective internal talent training path of new R&D institutions,improve the evaluation performance,and promote healthy development of new R&D institutions in Zhejiang Province.
文摘The construction of curriculum ideological and political education mechanism in colleges and universities in China has begun to take effect.In view of the differences in the key points of different colleges and universities in the construction of curriculum ideological and political education mechanism,the quality evaluation of curriculum ideological and political education mechanism is particularly important.However,the quality evaluation mechanism is related to ability,fairness,and potential.It is essential to assume the effectiveness of moral education in college curriculum ideological and political education as the benchmark,adhere to positioning experts,teachers,and students as the key elements of the main body of the evaluation mechanism,as well as establish a diversified quality evaluation standard system based on the teaching management,infrastructure,and moral education effectiveness.Building a scientific and multi-dimensional quality evaluation mechanism for ideological and political education in colleges and universities would promote the connotative development of ideological and political education in courses.
基金supported by the National Natural Science Foundation of China(Grant 52175236).
文摘Lattice structures have attracted extensive attention in the field of engineering materials due to their characteristics of lightweight and high strength.This paper combines topology optimization with additive manufacturing to investigate how pore shape in Triply Periodic Minimal Surface(TPMS)structures affects mechanical properties and energy absorption performance.The periodic lattice structures(Triangle lattice,rectangle lattice and Rectangle lattice)and aperiodic mixed structures are designed,including a variety of lattice structures such as circle-circle and triangle-triangle(CCTT),triangle-triangle and rectangle-rectangle(TTRR),circle-circle and rectangle-rectangle(CCRR),triangle-circle-circle-triangle(TCCT),rectangle-triangle-triangle-rectangle(RTTR)and rectangle-circle-circle-rectangle(RCCR).The anisotropy of the unit cells is compared by using the homogenization method.The deformation modes,mechanical properties,and energy absorption efficiency of lattice structures are evaluated systematically by finite element analysis and compression experiments.The results demonstrate that the circle lattice exhibits significantly superior performance in Young’s modulus,compressive strength,toughness,and energy absorption characteristics compared to the triangle lattice and the rectangle lattice.Among aperiodic structures,TCCT shows better comprehensive mechanical properties,while TTRR exhibits relatively inferior performance.The periodic structures possess overall superior mechanical performance.This study demonstrates that the mechanical properties and energy absorption characteristics can be optimized by controlling the pore shape of TPMS lattice structures.This provides an important insight into lightweight structure design in the engineering field.
文摘Early childhood character education is a critical element in shaping an individual’s moral foundation and fostering a sense of social responsibility.It plays a fundamental role in overall personal development.Although China’s early childhood character education has made progress with the support of policies and practical exploration,it still faces challenges such as the homogenization of educational models,a formalization of home-kindergarten cooperation,a single-dimensional evaluation system,and a need for further improvement in teachers’professional competence in character education.This paper draws on core theories of character education(e.g.,social learning theory and cognitive moral development theory)and incorporates representative case studies to conduct an in-depth analysis of the current landscape and associated challenges.It proposes innovative approaches,which include establishing a“threefold”system of implementation,enhancing the mechanisms for home-kindergarten co-education,optimizing and ensuring a multidimensional and dynamic evaluation system,equitably allocating teaching resources,and expanding the social support networks.The aim is to offer theoretical reference and practical solutions to promote the scientific and systematic development of early childhood character education.
基金Supported by Doctoral Foundation of Henan Polytechnic University(Grant No.B2012-101)Opening Project of Key Laboratory of Precision Manufacturing Technology and Engineering of Henan Polytechnic University,China(Grant No.PMTE201318A)Henan Provincial Science and Technology Research Projects of Education Department of China(Grant No.14B460033)
文摘Pneumatic actuators and electric actuators have almost been applied to all manufacturing industries. The two kinds of actuators can replace each other in most fields, such as the point to point transmission occasion and some rotating occasions. However, there are very few research results about the advantages and disadvantages of two kinds of actuators under the same working conditions so far. In this paper, a novel comprehensive assessment method, named as overall life cycle comprehensive assessment （OLCCA）, is proposed for comparison and assessment of pneumatic and electric actuators. OLCCA contains mechanical properties evaluation （MPE）, life cycle cost analysis based on users （LCCABOU） and life cycle environmental impact analysis （LCEIA） algorithm in order to solve three difficult problems： mechanical properties assessment, cost analysis and environmental impact assessment about actuators. The mechanical properties evaluation of actuators is a multi-objective optimization problem. The fuzzy data quantification and information entropy methods are combined to establish MPE algorithm of actuators. Two kinds of pneumatic actuators and electric actuators with similar bearing capacity and similar work stroke were taken for example to verify the correctness of MPE algorithm. The case study of MPE algorithm for actuators verified its correctness. LCCABOU for actuators is also set up. Considering cost complex structure of pneumatic actuators, public device cost even method （PDCEM） is firstly presented to solve cost division of public devices such as compressors, aftercooler, receivers, etc. LCCABOU method is also effective and verified by the three groups of pneumatic actuators and electric actuators. Finally, LCEIA model of actuators is established for the environmental impact assessment of actuators. LCEIA data collection method and model establishment procedure for actuators are also put forward. With Simapro 7, LCEIA comparison results of six actuators can be obtained： Fossil fuels are the major environmental factor of pneumatic and electric actuators; Environmental impact of electric actuator is large than one of pneumatic actuator under the similar mechanical properties and working conditions of pneumatic and electric actuators. The results are correct and correspond with the actual mechanical properties of actuators. This paper proposes a comprehensive evaluation method of the actuators, which can solve the critical problem that similar electromechanical products are very difficult to be compared with each other from the angle of performance, cost and environment impact.
基金supported by the Portuguese Foundation for Science and Technology,(UID/DTP/04045/2013)by the European Regional Develop-ment Fund,through COMPETE 2020(POCI--01--0145-FEDER--006969)+4 种基金funded by the European Regional Development Fund,through NORTE 2020(NORTE--01--0145--FEDER--000016)The European Regional Development Fund through the Operational Competitiveness Programthe Foun-dation for Science and Technology(FCT)of Portugal support the research unit CIAFEL within the projects FCOMP--01--0124--FEDER--020180(References FCT:PTDC/DES/122763/2010)and UID/DTP/00617/2013supported by the Portuguese Foundation for Science and Technology(REF:UID/BIM/04501/2013)FEDER/Compete2020 funds
文摘Although the observed progress in the cardiovascular disease treatment, the incidence of new and recurrent coronary artery disease remains elevated and constitutes the leading cause of death in the developed countries. Three-quarters of deaths due to cardiovascular diseases could be prevented with adequate changes in lifestyle, including increased daily physical activity. New evidence confirms that there is an inverse dose-response relationship between physical activity and cardiovascular disease and mortality risk. However, participation in moderate to vigorous physical activity may not fully attenuate the independent effect of sedentary activities on increased risk for cardiovascular diseases. Physical activity also plays an important role in secondary prevention of cardiovascular diseases by reducing the impact of the disease, slowing its progress and preventing recurrence. Nonetheless, most of eligible cardiovascular patients still do not benefit from secondary prevention/cardiac rehabilitation programs. The present review draws attention to the importance of physical activity in the primary and secondary prevention of cardiovascular diseases. It also addresses the mechanisms by which physical activity and regular exercise can improve cardiovascular health and reduce the burden of the disease.
文摘Evaluation is a form of communication between teachers and students in teaching. Teachers can guide students' progress and growth by pointing out students' advantages and problems. Making good use of evaluation mechanism can stimulate students' learning enthusiasm and improve students' learning enthusiasm. It is helpful to strengthen the teaching effect and improve students' comprehensive quality. This paper will talk about how to evaluate students in low-grade mathematics classroom teaching activities in rural primary schools.
基金2022 Inner Mongolia Higher Education Association-Higher Education Research Key Topic“Innovation and Practice of Teaching Basic Computer Courses in Local Universities”(Project number:NMGJXH-2022XB026)。
文摘The rapid advancement of information technology poses significant pedagogical challenges for basic computer courses in local colleges and universities.This study proposes a comprehensive framework for instructional innovation,encompassing the restructuring of course content,enrichment of teaching resources,reformulation of instructional methods,and the establishment of feedback channels,as well as a comprehensive framework for optimizing assessment mechanisms.The implementation of this framework has yielded remarkable outcomes,including heightened classroom engagement and academic rigor as well as an overall enhancement in students’critical thinking and practical skills.These transformative changes have propelled basic computer courses in local higher education institutions to a new stage while offering valuable insights for future pedagogical reforms.
基金supported by the 2022 Theoretical Research Project on Talent Work of the China Association for Science and Technology(CAST)titled“Research on Talent Discovery and Utilization Mechanisms for Key Core Technical Personnel:A Case Study in Aerospace,Integrated Circuits,and Related Fields”(2022070607CG0905012022).
文摘1 Introduction Existing university research evaluation mechanisms face issues like unclear value orientation,poor classification,suboptimal expert selection,and unscientific organization[1].A comprehensive,scientific evaluation system is essential for advancing higher education.Motivation.Traditional evaluation methods struggle to keep up with the increasing complexity and variety of evaluation indicators[2].Data mining techniques,such as cooccurrence analysis and clustering,have been effective in uncovering hidden patterns in large datasets,addressing the limitations of traditional qualitative methods[3−5].However,research applying these techniques in this field remains limited.
基金The project is supported by National Natural Science Foundation of China (39770432)ZhejiangProvincial Natural Science Founda
文摘On the basis of analyzing the shortage of scale measure of the current AHP, and following base principIe of two comparison: principle of reward-punishment and principle of conversion, translation function and conciliation coefficient have been structured. This article advances a new measure which structuring translation function and conciliation coefficient. The result of application of improved AHP on the synthesis evaluation of agricultural mechanization is satisfactory.
