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Adaptive Stabilization of Feedforward Time-delay Systems with Uncertain Output Equation
Yiming Shao,Xianglei Jia,Wenhui Liu,Guobao Liu 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.4
In this work, the problem of global adaptive stabilization is solved by output feedback for a family of feedforward nonlinear time-delay systems with uncertain output equation and unknown growth rate. To deal with system uncertainty, a low-gain observer incorporating with novel adaptive gain is first proposed. Next, via output feedback, an adaptive delay-free controller is constructed by combining scaling change with backstepping algorithm. Compared with existing results, the controller proposed is capable of handling both uncertain output equation and unknown delay. With the aid of Lyapunov-Krasovskii functional and Barbalat ˘ ’s lemma, it is shown that the state and its estimate converge asymptotically to zero, and the adaptive gain is bounded. Furthermore, by numerical simulations, the usefulness of the control scheme is illustrated.
Synthesis and electrochemical applications of nitrogen-doped carbon nanomaterials
Majeed, Saadat,Zhao, Jianming,Zhang, Ling,Anjum, Saima,Liu, Zhongyuan,Xu, Guobao Walter de Gruyter GmbH 2013 Nanotechnology Reviews Vol.2 No.6
<B>Abstract</B><P>Nitrogen doping is an effective way to tailor the properties of the shaped carbon materials, including the nanotubes, nanocups, nanofibers, as well as the nanorods, and render their potential use for various applications. The common bonding configurations obtained on the N insertion is the pyridinic N and pyrrolic N, which impart the characteristic properties to these carbon materials. This review will focus on the nitrogen-doped carbon materials, the doping effect on the electrochemistry of the doped nanomaterials, and the various synthetic methods to introduce N into the carbon network. The potential applications of the N-doped materials are also reviewed on the basis of the experimental and theoretical studies in electrochemistry.</P>
Differential die-away technology applied to detect special nuclear materials
Lianjun Zhang,Mengjiao Tang,Chen Zhang,Yulai Zheng,Yong Li,Chao Liu,Qiang Wang,Guobao Wang Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.7
Differential die-away analysis (DDAA) technology is a special nuclear material (SNM) active detection analysis technology. Be a nuclear material shielded or not, the technology can reveal the existence of nuclear materials by inducing fission from an external pulsed neutron source. In this paper, a detection model based on DDAA analysis technology was established by geant4 Monte Carlo simulation software, and the optimal sensitivity of the detection system is achieved by optimizing different configurations. After the geant4 simulation and optimization, a prototype was established, and experimental research was carried out. The result shows that the prototype can detect 200 g of <sup>235</sup>U in a steel cylinder shield that's of 1.5 cm in inner diameter, 10 cm in thickness and 280 kg in weight.