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Chengyu Yang,Xiaojuan Yang,Feng Li,Taohai Li,Wei Cao 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.39 No.-
Functional Sb2WO6 samples were prepared by a solvothermal method. XRD and XPS spectroscopy wereused to demonstrate structures of the as-prepared Sb2WO6 samples. And the morphologies werecharacterized via SEM and TEM. Different morphologies of the Sb2WO6 samples can be convenientlyachieved by simply changing the pH value. The Sb2WO6microspheres were obtained when the pH = 2. Apossible formation process of Sb2WO6 microspheres was proposed. The Sb2WO6 microspheres have highphotocatalytic activity and stability for the degradation of Rhodamine B. Moreover, the wettability ofSb2WO6 microspheres was also investigated. Results suggest that Sb2WO6 surface has highsuperhydrophobicity.
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Consensus in Multi-Agent Systems with Nonlinear Uncertainties under a Fixed Undirected Graph
Jie Luo,Chengyu Cao 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.2
This paper presents consensus algorithms by integrating cooperative control and adaptive control laws for multi-agent systems with unknown nonlinear uncertainties. An ideal multi-agent system without uncertainties is introduced first. The cooperative control law, based on an artificial potential function, is designed to make the ideal multi-agent system achieve consensus under a fixed and connected undirected graph. The presence of uncertainties will degenerate the performance, or even destabilize the whole multi-agent system. The L1 adaptive control law is therefore introduced to handle unknown nonlinear uncertainties. Two different consensus cases are considered: 1) normal consensus—where all agents reach an agreement on an initially undetermined position and velocity, and 2) consensus with a virtual leader—where all agents’ states converge to the virtual leader’s states. Under a fixed and connected undirected graph, the presented consensus algorithms enable the real multi-agent system to stay close to the ideal multi-agent system which achieves consensus with or without a virtual leader. Simulation results of 2-D consensus with nonlinear uncertainties are provided to demonstrate the presented algorithms.
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Effect of a Multi-stage Processing Method on the Composite Properties of a Stainless-Steel Surface
Jing Li,Jianan Cao,Lida Pan,Feng Du,Weibing Wang,Chengyu Xu 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.4
In this study, a multi-stage sandblasting and acid-etching processing method is used to prepare a 304 stainless-steel surfacewith a loose structure that has the composite properties of superhydrophobicity, low adhesion, anti-icing ability, self-cleaningbehavior and corrosion resistance. The surface morphology and chemical constituents of this structure are characterizedby scanning electron microscopy and X-ray diffraction, respectively. The results show that the micro-scale roughness anddifferent degrees of porosity in this structure play a key role in its superhydrophobicity.The anti-icing properties and corrosionresistance are characterized by contact-angle measurements and electrochemical workstation analyses, respectively. The results show that superhydrophobicity has positive effects on surface self-cleaning, anti-icing properties and corrosionresistance of 304 stainless-steel.
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