This paper first focuses on a brief evaluation of the teacher-centered and the learner-centered methodologies and the relevant result and the necessity for changing. Secondly ,it represents the practical ways of teach...This paper first focuses on a brief evaluation of the teacher-centered and the learner-centered methodologies and the relevant result and the necessity for changing. Secondly ,it represents the practical ways of teaching based on the learner-centered approach in classrooms to show how students' initiative is given .Thirdly , it presents the guidance for fellow teachers and students in group activities .The author of the paper believes that getting students started is the initial step towards active learning and fruitful teaching. It is proposed that efforts made to get students involved should focus not only on forms of activities but also on their contents , skill integration and establishing cooperative relationships between teachers and students or among students.展开更多
Unidirectional English Teaching based on Teacher origin is still the main way in our country at the present.Because of the humanistic process of English teaching reformation,man factor has become the important one in ...Unidirectional English Teaching based on Teacher origin is still the main way in our country at the present.Because of the humanistic process of English teaching reformation,man factor has become the important one in the English teaching re search and in recent years for Student-centre English teaching calls for higher and higher,the teacher’s role and position in teaching has been backward to the second importance.But in teaching,the flow of knowledge is not reciprocal,both teachers and students have equal personalities.Taking teaching contents,teaching structure and the language application into consider ation,we may take a new look at the English teaching and reform it in order to improve the teaching mode based on teacher-ori gin and improve the students’learning effect as well.展开更多
The detection of very high energy γ-ray emission from the Galactic center has been reported by four independent groups. One of these γ-ray sources, the 10 TeV -γ-ray radiation reported by HESS, has been suggested a...The detection of very high energy γ-ray emission from the Galactic center has been reported by four independent groups. One of these γ-ray sources, the 10 TeV -γ-ray radiation reported by HESS, has been suggested as having a hadronic origin when relativistic protons are injected into and interact with the dense ambient gas. Assuming that such relativistic protons required by the hadronic model come from the tidal disruption of a star by the massive black hole of Sgr A＊, we explore the spectrum of the relativis- tic protons. In the calculations, we investigate cases where different types of stars are tidally disrupted by the black hole of Sgr A＊, and we consider that different diffusion mechanisms are used for the propagation of protons. The initial energy distribution of the injected spectrum of protons is assumed to follow a power-law with an exponential cut-off, and we derive the different indices of the injected spectra for the tidal disruption of different types of stars. For the best fit to the spectrum of photons detected by HESS, the spectral index of the injected relativistic protons is about 2.05 when a red giant is tidally disrupted by the black hole of Sgr A＊ and the diffusion mechanism is the Effective Confinement of Protons.展开更多
By means of programs GTMPAC based- on generalized triangle method,analysis and synthesis of mechanism design in accordance with absolutely graphicalmethod( absolutely germetrical method) are developed.In this paper,we...By means of programs GTMPAC based- on generalized triangle method,analysis and synthesis of mechanism design in accordance with absolutely graphicalmethod( absolutely germetrical method) are developed.In this paper,we make aspecial study about centering- point curve and circling- point curve and couplercurves based on Ball’s points.展开更多
A case study has been made to explore whether the teacher’s role in data-driven learning(DDL)can be minimized.The outcome shows that the teacher’s role in offering an explicit instruction may be indispensable and ev...A case study has been made to explore whether the teacher’s role in data-driven learning(DDL)can be minimized.The outcome shows that the teacher’s role in offering an explicit instruction may be indispensable and even central to the acquisi tion of English articles.展开更多
文摘This paper first focuses on a brief evaluation of the teacher-centered and the learner-centered methodologies and the relevant result and the necessity for changing. Secondly ,it represents the practical ways of teaching based on the learner-centered approach in classrooms to show how students' initiative is given .Thirdly , it presents the guidance for fellow teachers and students in group activities .The author of the paper believes that getting students started is the initial step towards active learning and fruitful teaching. It is proposed that efforts made to get students involved should focus not only on forms of activities but also on their contents , skill integration and establishing cooperative relationships between teachers and students or among students.
文摘Unidirectional English Teaching based on Teacher origin is still the main way in our country at the present.Because of the humanistic process of English teaching reformation,man factor has become the important one in the English teaching re search and in recent years for Student-centre English teaching calls for higher and higher,the teacher’s role and position in teaching has been backward to the second importance.But in teaching,the flow of knowledge is not reciprocal,both teachers and students have equal personalities.Taking teaching contents,teaching structure and the language application into consider ation,we may take a new look at the English teaching and reform it in order to improve the teaching mode based on teacher-ori gin and improve the students’learning effect as well.
基金funded by the National Natural Science Foundation of China (Grant Nos. 10873015, 10778716, 10573021, 10778064, 10673001 and 10433010)the National Basic Research Program of China (Grant 2009CB824800)
文摘The detection of very high energy γ-ray emission from the Galactic center has been reported by four independent groups. One of these γ-ray sources, the 10 TeV -γ-ray radiation reported by HESS, has been suggested as having a hadronic origin when relativistic protons are injected into and interact with the dense ambient gas. Assuming that such relativistic protons required by the hadronic model come from the tidal disruption of a star by the massive black hole of Sgr A＊, we explore the spectrum of the relativis- tic protons. In the calculations, we investigate cases where different types of stars are tidally disrupted by the black hole of Sgr A＊, and we consider that different diffusion mechanisms are used for the propagation of protons. The initial energy distribution of the injected spectrum of protons is assumed to follow a power-law with an exponential cut-off, and we derive the different indices of the injected spectra for the tidal disruption of different types of stars. For the best fit to the spectrum of photons detected by HESS, the spectral index of the injected relativistic protons is about 2.05 when a red giant is tidally disrupted by the black hole of Sgr A＊ and the diffusion mechanism is the Effective Confinement of Protons.
文摘By means of programs GTMPAC based- on generalized triangle method,analysis and synthesis of mechanism design in accordance with absolutely graphicalmethod( absolutely germetrical method) are developed.In this paper,we make aspecial study about centering- point curve and circling- point curve and couplercurves based on Ball’s points.
文摘A case study has been made to explore whether the teacher’s role in data-driven learning(DDL)can be minimized.The outcome shows that the teacher’s role in offering an explicit instruction may be indispensable and even central to the acquisi tion of English articles.
