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Jian Zhang,Shuai Ma,Jiawen Zhu,Kejia Kang,Guoqiang Luo,Chuandong Wu,Qiang Shen,Lianmeng Zhang 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.2
In this work, W/HfC composite materials were synthesized using plasma activated sintering. The influence of the sinteringtemperature and HfC weight fraction on the relative density, microstructure and compression strength were investigated. The results demonstrated that the sintering temperature and the HfC content significantly affected the microstructure of W/HfC composites. Moreover, the grain size of the W/HC composites decreased and the mechanical properties were improvedremarkably due to the addition of HfC. The majority of HfC particles reacted with oxygen impurities to generate HfO2,whichpurified the grain boundaries and refined the grain size of the W matrix. The optimum content of HfC is 2 wt%, at which ahigh compressive strength of 1.98 GPa and a high strain of 34.7% were obtained.
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Wanli Zhang,Chuandong Li,Tingwen Huang,Junjian Huang 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.5
This paper investigates finite-time synchronization of neural networks (NNs) with multiple proportional delays. In order to cope with the difficulties induced by multiple proportional delays, suitable nonlinear variable transformations and new 1-norm-based analytical techniques are developed. By constructing Lyapunov functional and designing new designed controllers, several new sufficient conditions are derived to realize synchronization in finite time. Moreover, estimation of the upper bound of synchronization time is also provided for NNs with bounded delays or proportional delays. The designed controllers without sign function are simple, which means the chattering phenomenon in most of the existing results can be overcome. A numerical simulation is offered to verify the effectiveness of the theoretical analysis.
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Leader-following Consensus of Multi-agent Systems via a Hybrid Protocol with Saturation Effects
Xiang Hu,Zufan Zhang,Chuandong Li,Liangliang Li 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.1
In this paper, a hybrid protocol which can control multi-agent systems to achieve “leader-followingconsensus” is proposed, the control protocol is periodic and is composed of continuous control and impulse control. Considering the power limitation and the time error of the actual industrial production equipments, the impulsesaturation effects and the impulse time window are introduced. In this paper, the multi-agent system is modeled,one of the agents is designated as the leader, and the rest of the agents are the followers. Then the error systemequations of the multi-agent system is derived. The stability of the error system is analyzed by constructing theLyapunov function. Theorem 1 and theorem 2 are obtained as the criteria of state consensus of the multi-agentsystem. Finally, a numerical experiment is carried out to verify the reliability and efficiency of the conclusions aregiven in this paper. Because it takes into account the impulse time window and impulse saturation effects, which ismore in line with the actual industrial production.
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Yun Zhao,Jiangquan Ma,Kun Chen,Chuandong Zhang,Chao Yao,Shixiang Zuo,Yong Kong 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.5
Graphene-based polyaniline (PANI/RGO), used as conductive filler, was synthesized through a new one-pot emulsion polymerization technology. Graphene dispersion (RGO) was obtained by ultrasonically reducing graphene oxide (GO) in a hot sodium hydroxide solution in the absence of any toxic reductant, such as hydrazine hydrate. Sodium dodecyl benzene sulfonate (SDBS), in which RGO sheets were dispersed, was synthesized using dodecyl benzenesulfonic acid (DBSA) and NaOH. In this RGO/SDBS mixture, polyaniline (PANI), doped with multiple acids (HClDBSA), was then uniformly polymerized on the surface of the RGO sheets. The experimental results showed that this reaction improved the dispersion of the RGO in the PANI system, and increased the homogeneous distribution of the formed PANI particles on the RGO surface. The synthesized composite material (PANI/RGO) had good thermal stability, electrical conductivity (about 11.71 S · cm -1) and water dispersibility. Based on its excellent properties, the PANI/RGO was combined with waterborne epoxy resin to prepare anticorrosion coatings. The corrosion resistance of these coatings was studied using Tafel plots, along with other critical properties tested by the national standards. The results suggested that the surface resistivity of the coatings could be as high as 2.48 X 10 8 Ω with the addition around 3 wt.% of the PANI/RGO meeting good antistatic standards. In addition, the antistatic coatings had outstanding corrosion resistance, as well as tremendous physical and chemical properties.
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