Magnetic Coupling Induced Self-Assembly at Atomic Level

Developing accurate self-assembly is the key for constructing functional materials from a bottom-up approach.At present, it is mainly hindered by building blocks and driving modes. We design a new self-assembly method based on the magnetic coupling between spin-polarized electrons. First-principles calculations show that spinpolarized electrons from different endohedral metallofullerene(EMF) superatoms can pair each other to ensure a one-dimensional extending morphology. Furthermore, without ligand passivation, the EMF superatoms maintain their electronic structures robustly in self-assembly owing to the core-shell structure and the atomic-like electron arrangement rule. Therefore, it should noted that the magnetic coupling of monomeric electron spin polarization can be an important driving mechanism for high-precision self-assembly. These results represent a new paradigm for self-assembly and offer fresh opportunities for functional material construction at the atomic level.     

cdma2000 1x EV-DO系统中一种自适应速率控制方案

dma2000 1x EV-D0标准支持可变速率的高速无线数据业务，它在反向链路上采用分布式速率控制机制。文中提出一种通过控制RateLimit来进行自适应速率控制的方案，并引入离散马尔可夫链模型对此方案进行了理论分析。仿真结果显示，所提方案在过载概率和反向链路有效吞吐量两个指标上优于1x EV-D0标准中的方案，因此，提高了反向链路速率控制的性能。     

cdma2000 lx EV-DO系统中一种自适应速率控制方案

cdma2000 lx EV-DO标准支持可变速率的高速无线数据业务,它在反向链路上采用分布式速率控制机制.文中提出一种通过控制RateLimit来进行自适应速率控制的方案,并引入离散马尔可夫链模型对此方案进行了理论分析.仿真结果显示,所提方案在过载概率和反向链路有效吞吐量两个指标上优于lx EV-DO标准中的方案,因此,提高了反向链路速率控制的性能.