Through equilibrium and non-equilibrium molecular dynamics simulations,we have demonstrated the inhibitory effect of composition graded interface on thermal transport behavior in lateral heterostructures.Specifically,...Through equilibrium and non-equilibrium molecular dynamics simulations,we have demonstrated the inhibitory effect of composition graded interface on thermal transport behavior in lateral heterostructures.Specifically,we investigated the influence of composition gradient length and heterogeneous particles at the silicene/germanene(SIL/GER)heterostructure interface on heat conduction.Our results indicate that composition graded interface at the interface diminishes the thermal conductivity of the heterostructure,with a further reduction observed as the length increases,while the effect of the heterogeneous particles can be considered negligible.To unveil the influence of composition graded interface on thermal transport,we conducted phonon analysis and identified the presence of phonon localization within the interface composition graded region.Through these analyses,we have determined that the decrease in thermal conductivity is correlated with phonon localization within the heterostructure,where a stronger degree of phonon localization signifies poorer thermal conductivity in the material.Our research findings not only contribute to understanding the impact of interface gradient-induced phonon localization on thermal transport but also offer insights into the modulation of thermal conductivity in heterostructures.展开更多
针对接收阵列射频通道间增益不一致以及系统感知模型与目标角度信息失配等情况下,基于压缩感知(Compressive Sensing,CS)的多目标波达方向(Direction of Arrival,DOA)估计方法性能下降的问题,提出了一种新的单通道CS-DOA估计方法.引入...针对接收阵列射频通道间增益不一致以及系统感知模型与目标角度信息失配等情况下,基于压缩感知(Compressive Sensing,CS)的多目标波达方向(Direction of Arrival,DOA)估计方法性能下降的问题,提出了一种新的单通道CS-DOA估计方法.引入一种单通道阵列体制,并建立系统模型失配时的DOA稀疏感知模型;将丹茨格(Dantzig Selector,DS)算法和遗传算法相结合,分别对目标角度信息矢量和系统模型失配误差进行交替迭代优化.该方法有效克服了常见CS-DOA方法无法抑制系统模型失配误差的问题,避免了射频通道间增益不一致对DOA估计性能的影响.仿真结果表明:该方法性能优于传统DOA估计算法,能够对任意相关性信号进行有效DOA估计,具有更高的角度分辨力和估计精度.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No.12104291)。
文摘Through equilibrium and non-equilibrium molecular dynamics simulations,we have demonstrated the inhibitory effect of composition graded interface on thermal transport behavior in lateral heterostructures.Specifically,we investigated the influence of composition gradient length and heterogeneous particles at the silicene/germanene(SIL/GER)heterostructure interface on heat conduction.Our results indicate that composition graded interface at the interface diminishes the thermal conductivity of the heterostructure,with a further reduction observed as the length increases,while the effect of the heterogeneous particles can be considered negligible.To unveil the influence of composition graded interface on thermal transport,we conducted phonon analysis and identified the presence of phonon localization within the interface composition graded region.Through these analyses,we have determined that the decrease in thermal conductivity is correlated with phonon localization within the heterostructure,where a stronger degree of phonon localization signifies poorer thermal conductivity in the material.Our research findings not only contribute to understanding the impact of interface gradient-induced phonon localization on thermal transport but also offer insights into the modulation of thermal conductivity in heterostructures.
文摘针对接收阵列射频通道间增益不一致以及系统感知模型与目标角度信息失配等情况下,基于压缩感知(Compressive Sensing,CS)的多目标波达方向(Direction of Arrival,DOA)估计方法性能下降的问题,提出了一种新的单通道CS-DOA估计方法.引入一种单通道阵列体制,并建立系统模型失配时的DOA稀疏感知模型;将丹茨格(Dantzig Selector,DS)算法和遗传算法相结合,分别对目标角度信息矢量和系统模型失配误差进行交替迭代优化.该方法有效克服了常见CS-DOA方法无法抑制系统模型失配误差的问题,避免了射频通道间增益不一致对DOA估计性能的影响.仿真结果表明:该方法性能优于传统DOA估计算法,能够对任意相关性信号进行有效DOA估计,具有更高的角度分辨力和估计精度.
