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HALF-METALLIC SILICENE AND GERMANENE NANORIBBONS: TOWARDS HIGH-PERFORMANCE SPINTRONICS DEVICE
YANGYANG WANG,JIAXIN ZHENG,ZEYUAN NI,RUIXIANG FEI,QIHANG LIU,RUGE QUHE,CHENGYONG XU 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2012 NANO Vol.7 No.5
By using first-principles calculations, we predict that an in-plane homogenous electrical ¯eld can induce half-metallicity in hydrogen-terminated zigzag silicene and germanene nanoribbons (ZSiNRs and ZGeNRs). A dual-gated ¯nite ZSiNR device reveals a nearly perfect spin-¯lter e±ciency (SFE)of up to 99% while a quadruple-gated ¯nite ZSiNR device serves as an effective spin ¯eld e®ect transistor (FET) with an on/o® current ratio of over 100 from ab initio quantum transport simulation. This discovery opens up novel prospect of silicene and germanene in spintronics.
Research and Experimental Analysis of Damping Characteristics of Magnetic Shape Memory Alloy
Zhang Qingxin,Fu Qihang,Wang Luping,Gao Yunhong 한국전기전자재료학회 2018 Transactions on Electrical and Electronic Material Vol.19 No.4
This paper systematically illustrates the deformation and damping mechanism of magnetic shape memory alloy (MSMA)and builds a damping mathematical model by using a single-degree-of-freedom vibration system. The results indicate thatabsorbed damping is proportional to the quadratic of external force and inversely proportional to the overall mass, the naturalfrequency and the total damping of the system when the system is in resonance. At the same time, the paper calculates therelative power and draws the stress–strain curve of mechanical property. The relations among temperature, stress, intensityof magnetic induction, and deformation of MSMA are studied through a static experiment. Meanwhile, an analysis of thedamping characteristic indicates that the external force is 25–30 N when the temperature ranges from 23 to 29 °C and thatthe deformation rate is the largest and the damping performance is the best at a magnetic induction strength of 0.55 T.
Tariku Sinshaw Tamir,Qihang Fang,Ehtisham Lodhi,Gang Xiong,Zhen Shen,Xisong Dong,Sheng Liu,Fei-Yue Wang 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.3
Additive manufacturing, also known as 3D printing, is an emerging technology. The existing additive manufacturing technologies deploy a 3-axis printing mechanism where the material accumulation grows only in the z-direction. This results in limited printing freedom. Apart from this, support structures are needed to print overhang structures. Removal of these supports ultimately reduces print quality. This paper proposes a novel robotassisted additive manufacturing along with a control system framework, which possesses multi-directional printing without support structures. Taking the advantage of its high stiffness and high payload-to-weight ratio, a 6-degree of freedom Stewart platform manipulator is designed to substitute the printer build plate. The kinematics and dynamics of the manipulator is formulated. Then, an extended proportion-derivation sliding mode controller is designed for trajectory tracking. The modified grey wolf optimization algorithm is applied to compute the optimal controller parameters. The integral absolute error (IAE) is used as a cost function and its minimum value is reached in the iteration interval [75,100]. The analytical model simulation in MATLAB is run for 10 seconds, and the results show that the desired length trajectories of the six legs of the manipulator are achieved after 3.5 seconds. The performance of the analytical model is verified on the automated dynamic analysis of mechanical systems (ADAMS).