By means of interviews with some demotivated students in English learning and questionnaires among 16 teachers of English and 170 non-English majors, this study identifies six latent variables and 18 observable variab...By means of interviews with some demotivated students in English learning and questionnaires among 16 teachers of English and 170 non-English majors, this study identifies six latent variables and 18 observable variables that result in demotivation in English teaming. Then a causal model of demotivation in English teaming is constructed. Relationships within the model are examined through analysis of Moment Structures analysis. It is found that learning environment, valence, learning purposes, interest in English, and anxiety had direct effects on demotivation in English learning. Besides, the interactions among the variables also affect demotivation in English learning.展开更多
This paper concerns with two reasons for stock price fluctuation, the instinctive stochastic fluctuation and the fluctuation caused by the spread of information. They are constructed by compound Poisson process and co...This paper concerns with two reasons for stock price fluctuation, the instinctive stochastic fluctuation and the fluctuation caused by the spread of information. They are constructed by compound Poisson process and continuum percolation model separately. Combining the two models, the authors get a Levy process for the price fluctuation that can explain the fat-tail phenomenon in stock market. The fat-tails axe also presented in numerical simulations.展开更多
Magnetization orientation of a nanoscale ferromagnet can be manipulated by an electric current via spin-transfer torque(STT) effect,which holds great promise in the applications of non-volatile magnetic random access ...Magnetization orientation of a nanoscale ferromagnet can be manipulated by an electric current via spin-transfer torque(STT) effect,which holds great promise in the applications of non-volatile magnetic random access memory(MRAM) and spintorque oscillators.We review the fundamental mechanism and experimental progress of the STT effect.Then,different formula of STT torque has been classified,which can be added to the conventional Landau-Lifshitz-Gilbert equation.After that,we show some simulation results that mainly concern the STT-driven vortex dynamics,magnetization oscillations excited by a perpendicular polarizer,and the detail dynamics by in-plane and out-of-plane dual spin polarizers.展开更多
文摘By means of interviews with some demotivated students in English learning and questionnaires among 16 teachers of English and 170 non-English majors, this study identifies six latent variables and 18 observable variables that result in demotivation in English teaming. Then a causal model of demotivation in English teaming is constructed. Relationships within the model are examined through analysis of Moment Structures analysis. It is found that learning environment, valence, learning purposes, interest in English, and anxiety had direct effects on demotivation in English learning. Besides, the interactions among the variables also affect demotivation in English learning.
基金supported by the Natural Science Foundation of Tianjin,China under Grant No.09JCYBLJC01800the China Postdoctoral Science Foundation Funded Project under Grant No.20110491248
文摘This paper concerns with two reasons for stock price fluctuation, the instinctive stochastic fluctuation and the fluctuation caused by the spread of information. They are constructed by compound Poisson process and continuum percolation model separately. Combining the two models, the authors get a Levy process for the price fluctuation that can explain the fat-tail phenomenon in stock market. The fat-tails axe also presented in numerical simulations.
基金support by the National Natural Science Foundation of China(Grant Nos.11074046,11274241,51171047 and 51222103)the Shuguang Program of Shanghai Education Commission(Grant No.09SG22)the New Century Educational Talents Plan of Chinese Education Ministry(Grant No.NCET-10-0603)
文摘Magnetization orientation of a nanoscale ferromagnet can be manipulated by an electric current via spin-transfer torque(STT) effect,which holds great promise in the applications of non-volatile magnetic random access memory(MRAM) and spintorque oscillators.We review the fundamental mechanism and experimental progress of the STT effect.Then,different formula of STT torque has been classified,which can be added to the conventional Landau-Lifshitz-Gilbert equation.After that,we show some simulation results that mainly concern the STT-driven vortex dynamics,magnetization oscillations excited by a perpendicular polarizer,and the detail dynamics by in-plane and out-of-plane dual spin polarizers.
