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Zhu, Zhili,Cai, Xiaolin,Yi, Seho,Chen, Jinglei,Dai, Yawei,Niu, Chunyao,Guo, Zhengxiao,Xie, Maohai,Liu, Feng,Cho, Jun-Hyung,Jia, Yu,Zhang, Zhenyu American Physical Society 2017 Physical Review Letters Vol.119 No.10
<P>Contemporary science is witnessing a rapid expansion of the two-dimensional (2D) materials family, each member possessing intriguing emergent properties of fundamental and practical importance. Using the particle-swarm optimization method in combination with first-principles density functional theory calculations, here we predict a new category of 2D monolayers named tellurene, composed of the metalloid element Te, with stable 1T-MoS2-like (alpha-Te), and metastable tetragonal (beta-Te) and 2H-MoS2-like (gamma-Te) structures. The underlying formation mechanism is inherently rooted in the multivalent nature of Te, with the central-layer Te behaving more metal-like (e.g., Mo), and the two outer layers more semiconductorlike (e.g., S). We also show that the alpha-Te phase can be spontaneously obtained from the magic thicknesses divisible by three layers truncated along the [ 001] direction of the trigonal structure of bulk Te, and both the alpha- and alpha-Te phases possess electron and hole mobilities much higher than MoS2. Furthermore, we present preliminary but convincing experimental evidence for the layering behavior of Te on HOPG substrates, and predict the importance of multivalency in the layering behavior of Se. These findings effectively extend the realm of 2D materials to group-VI elements.</P>
Study on Multi-path Planning and Tracking Control of the UCAV Based on Evolutionary Algorithm
Hanqiao Huang,Huan Zhou,Yawei Cai 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10
Aiming at studying the multi-path planning and tracking control of the unmanned combat aerial vehicle(UCAV) in multi-constraints condition. In this paper, the mathematic model of the UCAV is built, then, the chromosome representation of path nodes and fitness function are proposed based on evolutionary algorithm. According to different operational requirements, the multi-path planning algorithm is put forward. Secondly, the paths are smoothened to get the attitude solved. Finally, the tracking of the trajectory attitude and velocity are realized with dynamics model of the UCAV by sliding mode variable structure control method. Simulation results demonstrate that the multi-path planned under the dynamic operational environment can meet different requirements, and the tracking controller has good accuracy and robustness.