Poly(vinylidene fluoride-trifluoroethylene)(P(VDF-TrFE)) is a derivative of polyvinylidene fluoride(PVDF), known for its excellent ferroelectric properties, optical characteristics, chemical stability, and flexibility...Poly(vinylidene fluoride-trifluoroethylene)(P(VDF-TrFE)) is a derivative of polyvinylidene fluoride(PVDF), known for its excellent ferroelectric properties, optical characteristics, chemical stability, and flexibility, making it a promising material for applications in electronic devices. In this study, the polarization switching mechanism of the β-phase of P(VDFTrFE) is investigated using the polarized crystal charge method, along with molecular dynamics simulations. The simulation results show that the saturation polarization value is approximately 5.3 μC/cm^(2), and a coercive field of around 0.5 V/nm is required to switch its polarization states. By fitting the polarization reversal curve with the Kolmogorov–Avrami–Ishibashi model, it is observed that the data in the asymptotic and switching regions closely align with the predictions of the model,and the Avrami index n consistently ranges between 1 and 2. The polarization reversal is completed within approximately10 ps, demonstrating high-speed dynamic behavior. Additionally, we predict that the ferroelectric phase transition occurs between 420 K and 430 K, with stable polarization performance maintained over a wide temperature range, which is consistent with experimental results.展开更多
Clos交换网络以其低成本优势和良好的可扩展性成为高速大容量交换系统的主流交换结构;另外,随着数据中心网络(data center network,DCN)诞生与发展,交换节点(路由器/交换机)面临更苛刻的性能需求,但相应的指派算法因各种原因无法很好地...Clos交换网络以其低成本优势和良好的可扩展性成为高速大容量交换系统的主流交换结构;另外,随着数据中心网络(data center network,DCN)诞生与发展,交换节点(路由器/交换机)面临更苛刻的性能需求,但相应的指派算法因各种原因无法很好地服务于数据中心环境下的路由与交换.矩阵分解是解决Clos网络的路由指派的重要途径,但目前已有的大多数分解算法被证明为不完全.因此,基于矩阵分解提出一款针对可重排无阻塞Clos网络的非常有效的路由指派算法.该算法采用逐行分解策略,不仅能有效解决同类算法的不完全性,亦能在串行时间O(nr2)内正确地分解任意的业务矩阵,而且避免在调度器与线卡之间产生较长的往返时间,简单易实现于Clos交换网络.展开更多
基金Project supported by the National Key Research and Development Program of China (Grant No. 2021YFA1200700)the National Natural Science Foundation of China (Grant Nos. 11905054, 12275075, and 11704111)the Fundamental Research Funds for the Central Universities of China。
文摘Poly(vinylidene fluoride-trifluoroethylene)(P(VDF-TrFE)) is a derivative of polyvinylidene fluoride(PVDF), known for its excellent ferroelectric properties, optical characteristics, chemical stability, and flexibility, making it a promising material for applications in electronic devices. In this study, the polarization switching mechanism of the β-phase of P(VDFTrFE) is investigated using the polarized crystal charge method, along with molecular dynamics simulations. The simulation results show that the saturation polarization value is approximately 5.3 μC/cm^(2), and a coercive field of around 0.5 V/nm is required to switch its polarization states. By fitting the polarization reversal curve with the Kolmogorov–Avrami–Ishibashi model, it is observed that the data in the asymptotic and switching regions closely align with the predictions of the model,and the Avrami index n consistently ranges between 1 and 2. The polarization reversal is completed within approximately10 ps, demonstrating high-speed dynamic behavior. Additionally, we predict that the ferroelectric phase transition occurs between 420 K and 430 K, with stable polarization performance maintained over a wide temperature range, which is consistent with experimental results.
文摘Clos交换网络以其低成本优势和良好的可扩展性成为高速大容量交换系统的主流交换结构;另外,随着数据中心网络(data center network,DCN)诞生与发展,交换节点(路由器/交换机)面临更苛刻的性能需求,但相应的指派算法因各种原因无法很好地服务于数据中心环境下的路由与交换.矩阵分解是解决Clos网络的路由指派的重要途径,但目前已有的大多数分解算法被证明为不完全.因此,基于矩阵分解提出一款针对可重排无阻塞Clos网络的非常有效的路由指派算法.该算法采用逐行分解策略,不仅能有效解决同类算法的不完全性,亦能在串行时间O(nr2)内正确地分解任意的业务矩阵,而且避免在调度器与线卡之间产生较长的往返时间,简单易实现于Clos交换网络.
