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"信号与系统"和"数字信号处理"是通信专业的2门核心课程,它们联系非常紧密,内容上存在一定程度上的重复。对2门课程的知识体系及其间的联系进行了分析,在此基础上对2门课程的知识结构进行了重新整合。实践表明,通过知识点的整合,有效地减少了重复的教学内容,解决了教学内容多与教学课时少的矛盾,极大地提高了授课效率。 相似文献
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Quantum resonant tunneling behaviors of double-barrier structures on graphene are investigated under the tightbinding approximation. The Klein tunneling and resonant tunneling are demonstrated for the quasiparticles with energy close to the Dirac points. The Klein tunneling vanishes by increasing the height of the potential barriers to more than 300 meV. The Dirac transport properties continuously change to the Schro¨dinger ones. It is found that the peaks of resonant tunneling approximate to the eigen-levels of graphene nanoribbons under appropriate boundary conditions. A comparison between the zigzag- and armchair-edge barriers is given. 相似文献
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研究了电场调控型自旋场效应管的量子输运过程.该场效应管主要由双正交电场和Rashba自旋轨道耦合共同调制.运用散射矩阵方法并结合介观体系的相关输运理论,揭示了自旋场效应管在各参数调控下的自旋量子输运过程,其自旋输运规律可由相关理论给予解释.数值计算表明,与平行电场相比,对于自旋轨道耦合型自旋场效应管的量子输运,垂直电场的调制能够导致更加明显的自旋翻转. 相似文献
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以磁隧道结/重金属层组成的三端口磁隧道结为理论模型,通过对包含自旋转移矩和自旋轨道矩的Landau-Lifshitz-Gilbert (LLG)方程做线性化稳定性分析,研究了自旋轨道矩协助自旋转移矩驱动的磁化强度翻转.发现在自旋轨道矩协助下,磁矩的翻转时间极大减小,翻转时间随自旋轨道矩电流密度的增大而减小,且自旋转移矩和自旋轨道矩的结合可实现零磁场的磁化翻转.另外,相比自旋轨道矩的类阻尼项,类场项在磁化强度的翻转中起着主导作用,且自旋轨道矩类场项的出现也可以减小磁化强度的翻转时间,磁化强度翻转时间随自旋轨道矩类场项强度的增大而减小. 相似文献
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Resonant tunneling through double-barrier structures on grapheneResonant tunneling through double-barrier structures on grapheneResonant tunneling through double-barrier structures on grapheneResonant tunneling through double-barrier structures on graphene
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Quantum resonant tunneling behaviors of double-barrier structures on graphene are investigated under the tight- binding approximation. The Klein tunneling and resonant tunneling are demonstrated for the quasiparticles with energy close to the Dirac points. The Klein tunneling vanishes by increasing the height of the potential barriers to more than 300 meV. The Dirac transport properties continuously change to the Schr6dinger ones. It is found that the peaks of resonant tunneling approximate to the eigen-levels of graphene nanoribbons under appropriate boundary conditions. A comparison between the zigzag- and armchair-edge barriers is given. 相似文献
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