文化回应性教学注重学生对文化概念的理解和接受,并要求学生能在日常生活中灵活运用文化概念。在教学的过程中,文化回应性教学强调教师利用学生的文化差异来展开。文化回应性教学旨在促进学生多元视角与跨文化交际能力的形成,并在不同...文化回应性教学注重学生对文化概念的理解和接受,并要求学生能在日常生活中灵活运用文化概念。在教学的过程中,文化回应性教学强调教师利用学生的文化差异来展开。文化回应性教学旨在促进学生多元视角与跨文化交际能力的形成,并在不同文化背景中培养学生的全球视野,并促进学生的深度学习。Cultural responsive teaching focuses on students’ understanding and acceptance of cultural concepts, and requires students to flexibly use cultural concepts in daily life. In the process of teaching, culturally responsive teaching, which aims to promote the formation of students’ multi-perspective and intercultural communicative competence, cultivate students’ global perspective in different cultural backgrounds, and promote students’ deep learning, emphasizes that teachers should always make use of students’ cultural differences.展开更多
To decrease breakdown time and improve machine operation reliability,accurate residual useful life(RUL) prediction has been playing a critical role in condition based monitoring.A data fusion method was proposed to ac...To decrease breakdown time and improve machine operation reliability,accurate residual useful life(RUL) prediction has been playing a critical role in condition based monitoring.A data fusion method was proposed to achieve online RUL prediction of slewing bearings,which consisted of a reliability based RUL prediction model and a data driven failure rate(FR) estimation model.Firstly,an RUL prediction model was developed based on modified Weibull distribution to build the relationship between RUL and FR.Secondly,principal component analysis(PCA) was introduced to process multi-dimensional life-cycle vibration signals,and continuous squared prediction error(CSPE) and its time-domain features were employed as equipment performance degradation features.Afterwards,an FR estimation model was established on basis of the degradation features and relevant FRs using simplified fuzzy adaptive resonance theory map(SFAM) neural network.Consequently,real-time FR of equipment can be obtained through FR estimation model,and then accurate RUL can be calculated through the RUL prediction model.Results of a slewing bearing life test show that CSPE is an effective indicator of performance degradation process of slewing bearings,and that by combining actual load condition and real-time monitored data,the calculation time is reduced by 87.3%and the accuracy is increased by 0.11%,which provides a potential for online RUL prediction of slewing bearings and other various machineries.展开更多
This work presents the design and control of the DAB （dual active bridge） converter employing gyrator＇s theory. A brief summary of the theory is introduced, and its application for the DAB converter is verified wit...This work presents the design and control of the DAB （dual active bridge） converter employing gyrator＇s theory. A brief summary of the theory is introduced, and its application for the DAB converter is verified with a design example. After that, it develops the control and show results of simulations and experiment. Though the commutation not is studied, the advantage of method is the easy way for project and control of the DAB converter.展开更多
A new analytical method for springback of small curvature plane bending is addressed with unloading rule of classical elastic-plastic theory and principle of strain superposition.We start from strain analysis of plane...A new analytical method for springback of small curvature plane bending is addressed with unloading rule of classical elastic-plastic theory and principle of strain superposition.We start from strain analysis of plane bending which has initial curvature,and the theoretic derivation is on the widely applicable basic hypotheses.The results are unified to geometry constraint equations and springback equation of plane bending,which can be evolved to straight beam plane bending and pure bending.The expanding and setting round process is one of the situations of plane bending,which is a bend-stretching process of plane curved beam.In the present study,springback equation of plane bending is used to analyze the expanding and setting round process,and the results agree with the experimental data.With a reasonable prediction accuracy,this new analytical method for springback of plane bending can meet the needs of applications in engineering.展开更多
文摘文化回应性教学注重学生对文化概念的理解和接受,并要求学生能在日常生活中灵活运用文化概念。在教学的过程中,文化回应性教学强调教师利用学生的文化差异来展开。文化回应性教学旨在促进学生多元视角与跨文化交际能力的形成,并在不同文化背景中培养学生的全球视野,并促进学生的深度学习。Cultural responsive teaching focuses on students’ understanding and acceptance of cultural concepts, and requires students to flexibly use cultural concepts in daily life. In the process of teaching, culturally responsive teaching, which aims to promote the formation of students’ multi-perspective and intercultural communicative competence, cultivate students’ global perspective in different cultural backgrounds, and promote students’ deep learning, emphasizes that teachers should always make use of students’ cultural differences.
基金Projects(51375222,51175242)supported by the National Natural Science Foundation of China
文摘To decrease breakdown time and improve machine operation reliability,accurate residual useful life(RUL) prediction has been playing a critical role in condition based monitoring.A data fusion method was proposed to achieve online RUL prediction of slewing bearings,which consisted of a reliability based RUL prediction model and a data driven failure rate(FR) estimation model.Firstly,an RUL prediction model was developed based on modified Weibull distribution to build the relationship between RUL and FR.Secondly,principal component analysis(PCA) was introduced to process multi-dimensional life-cycle vibration signals,and continuous squared prediction error(CSPE) and its time-domain features were employed as equipment performance degradation features.Afterwards,an FR estimation model was established on basis of the degradation features and relevant FRs using simplified fuzzy adaptive resonance theory map(SFAM) neural network.Consequently,real-time FR of equipment can be obtained through FR estimation model,and then accurate RUL can be calculated through the RUL prediction model.Results of a slewing bearing life test show that CSPE is an effective indicator of performance degradation process of slewing bearings,and that by combining actual load condition and real-time monitored data,the calculation time is reduced by 87.3%and the accuracy is increased by 0.11%,which provides a potential for online RUL prediction of slewing bearings and other various machineries.
文摘This work presents the design and control of the DAB （dual active bridge） converter employing gyrator＇s theory. A brief summary of the theory is introduced, and its application for the DAB converter is verified with a design example. After that, it develops the control and show results of simulations and experiment. Though the commutation not is studied, the advantage of method is the easy way for project and control of the DAB converter.
基金supported by the National Natural Science Foundation of China(Grant No.50805126)the Natural Science Foundation of Hebei Province(Grant No.E2009000389)
文摘A new analytical method for springback of small curvature plane bending is addressed with unloading rule of classical elastic-plastic theory and principle of strain superposition.We start from strain analysis of plane bending which has initial curvature,and the theoretic derivation is on the widely applicable basic hypotheses.The results are unified to geometry constraint equations and springback equation of plane bending,which can be evolved to straight beam plane bending and pure bending.The expanding and setting round process is one of the situations of plane bending,which is a bend-stretching process of plane curved beam.In the present study,springback equation of plane bending is used to analyze the expanding and setting round process,and the results agree with the experimental data.With a reasonable prediction accuracy,this new analytical method for springback of plane bending can meet the needs of applications in engineering.
