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Observer-based Admissible Control for Singular Delta Operator Systems
Xin-zhuang Dong,Mingqing Xiao,Yushun Wang,Wenxue He 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
This paper studies the problem of designing an observer-based admissible controller for singular delta operator systems. Sufficient conditions are provided for the existence of an asymptotical and physically realizable observer. Then an observer-based admissible controller is obtained in terms of strict linear matrix inequalities. The corresponding gain matrices appeared in our proposed approach can be constructed through the feasible solutions of a set of linear matrix inequalities. Some numerical examples are presented to demonstrate the theoretical outcomes of the paper.
Wu Dun,Li Bo,Jia Cheng,Dong Min,Liang Wenxu,Gao Xia,Zhang Hui 한국탄소학회 2024 Carbon Letters Vol.34 No.3
In recent years, the efficient and clean utilization of coal has been widely concerned by scholars at home and abroad. Despite the abundance of global coal resources, the deep utilization rate of coal is still insufficient. To address this challenge, it has been explored the development and preparation of coal-based high value-added carbonaceous materials. In the present study, a novel process was developed for the preparation of graphene using biphenyl sourced from low-rank coal. Using chemical vapor deposition (CVD) technology, it was successfully implemented for us to grow high-quality graphene on copper foils. The prepared graphene products were observed and characterized using Raman spectroscopy, optical microscopy and scanning electron microscopy techniques. The results of this research provide a new perspective for the utilization of low-rank coal resources.
Two-dimensional photonic crystal color filter development
Cho, Eun-Hyoung,Kim, Hae-Sung,Cheong, Byoung-Ho,Oleg, Prudnikov,Xianyua, Wenxu,Sohn, Jin-Seung,Ma, Dong-Joon,Choi, Hwan-Young,Park, No-Cheol,Park, Young-Pil The Optical Society 2009 Optics express Vol.17 No.10
<P>Reflective color filters using two-dimensional photonic crystals based on sub-wavelength gratings were proposed and constructed. Using low-cost nanoimprint lithography, an amorphous silicon layer was deposited through the low-temperature PECVD process and patterned into two-dimensional structures. The isolated amorphous silicon patterns were readily crystallized using a multi-shot excimer laser annealing at low energy. A study of the close relationship between color filter reflectance and silicon pattern crystallinity is introduced. Theoretical and experimental results show that the proposed color filters have high reflectance and, moreover, decrease the dependence on incident angle compared to one-dimensional photonic crystal color filters.</P>