University of Science and Technology Beijing

About: University of Science and Technology Beijing is a education organization based out in Beijing, China. It is known for research contribution in the topics: Microstructure & Alloy. The organization has 41558 authors who have published 44473 publications receiving 623229 citations. The organization is also known as: Beijing Steel and Iron Institute.

An Approximate Optimal Control Approach for Robust Stabilization of a Class of Discrete-Time Nonlinear Systems With Uncertainties

Abstract: In this correspondence paper, the robust stabilization of a class of discrete-time nonlinear systems with uncertainties is investigated by using an approximate optimal control approach. The robust control problem is transformed into an optimal control problem under some proper restrictions on the bound of the uncertainties. For the purpose of dealing with the transformed optimal control, the discrete-time generalized Hamilton–Jacobi–Bellman equation is introduced and then solved using the successive approximation method with neural network implementation. In addition, a numerical simulation is included to illustrate the effectiveness of the robust control strategy.

Synthesis of Cu-Nanoparticle Hydrogel with Self-Healing and Photothermal Properties.

Abstract: Copper (Cu) nanoparticles possess unusual electrical, thermal, and optical properties However, applications of these materials are often limited by their tendency to oxidize We prepared Cu nanoparticles by a simple polyol method, with a good control over the particle size The reaction required no inert atmosphere or surfactant agents The as-prepared Cu nanoparticles showed good resistance to oxidation in solution These Cu nanoparticles were then incorporated into a biocompatible polysaccharide hydrogel, which further stabilized the nanoparticles The hybrid hydrogel exhibited a rapid self-healing ability Because of the excellent photothermal conversion properties of the embedded Cu nanoparticles, the hybrid hydrogel showed rapid temperature elevation under laser irradiation The hybrid hydrogel showed limited cytotoxicity; however, under laser irradiation the hydrogel displayed antibacterial properties owing to the heating effects This study demonstrates that our hybrid hydrogel may have applicatio