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Aharonov-Casher oscillasions of transmission through a mesoscopic ring with a magnetic impurity is investigated.Both spin-dependent transmission and reflection coefficients of spin-state electrons at zero-temperature are calculated as a function of the textured electric fields and its title angle in the present of spin-flipper scattering.It is found that the spin-exchange interaction can destroy intermittently periodic oscillations of spin-up transmission and reflection coefficients within some small ranges in the adiabatic region of quantum phase.However spin-down transmission and reflection coefficients appear periodic AC oscillations.The calculated results manifest that spindown transmission and reflection coefficients have the same perfect oscillation patterns.In the nonadiabatic region, the behavior of the anomalous AC oscillations are depedent on the difference between the tilt angle of spin and that of texture electric field. 相似文献
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进入中学以后,有很大一部分学生的数学学习产生了障碍,其中心理因素占有很大比重。教师应研究学生在数学学习中的障碍是哪些心理因素造成的,从而有效地把握学生的心理特征,扫除心理障碍,优化心理素质,激发学生数学学习的兴趣。中学生数学学习中出现的心理障碍有定势心理、陶醉心理、惰性心理、自卑心理等,教师要及时地掌握学生的心理变化,改进教法,引导学生自觉地消除数学学习的心理障碍。 相似文献
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Aharonov-Casher oscillasions of transmission through a mesoscopic ring with a magnetic impurity is investigated. Both spindependent transmission and reflection coefficients of spin-state electrons at zero-temperature are calculated as a function of the textured electric fields and its title angle in the present of spin-flipper scattering. It is found that the spin-exchange interaction can destroy intermittently periodic oscillations of spin-up transmission and reflection coefficients within some small ranges in the adiabatic region of quantum phase. However spin-down transmission and reflection coefficients appear periodic AC oscillations. The calculated results manifest that spindown transmission and reflection coefficients have the same perfect oscillation patterns. In the nonadiabatic region, the behavior of the anomalous AC oscillations are depedent on the difference between the tilt angle of spin and that of texture electric field. 相似文献
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进入中学以后,有很大一部分学生的数学学习产生了障碍,其中心理因素占有很大比重.教师应研究学生在数学学习中的障碍是哪些心理因素造成的,从而有效地把握学生的心理特征,扫除心理障碍,优化心理素质,激发学生数学学习的兴趣.中学生数学学习中出现的心理障碍有定势心理、陶醉心理、惰性心理、自卑心理等,教师要及时地掌握学生的心理变化,改进教法,引导学生自觉地消除数学学习的心理障碍. 相似文献
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小学美术课是九年义务教育阶段一门必修的艺术文化课程,是学校实施美育的重要途径。如何利用农村现有条件丰富农村小学美术课的教学内容,完成大纲要求的教学任务,我结合自己多年的教学经验谈谈认识。1.促使学生形成基本的美术素养首先必须坚信每个学生都具有学习美术的能力。人与人的个性都有一定差异, 相似文献
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