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RISS 인기검색어
- 검색키워드
- 저자 : Lingzhi Cao (검색결과 3 건)
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Bifurcation Control in a Delayed Two-neuron Fractional Network
Lingzhi Zhao,Jinde Cao,Chengdai Huang,Ahmed Alsaedi,Abdullah Al-Barakati,Habib M. Fardoun 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.3
The issue of bifurcation control for a delayed fractional network involving two neurons is concerned. Delay-dependent stability conditions and the bifurcation point are established by discussing the associated characteristicequation of the proposed network. Then, a delayed feedback controller is firstly designed to stabilizethe Hopf bifurcation, and desirable dynamics is achieved. It is indicated that the designed controller is extremelyeffective which can postpone the onset of bifurcation by carefully selecting the feedback gain. Finally, simulationresults are given to verify the efficiency of the theoretical results.
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Zhang, Yue,Xu, Xiaoyun,Cao, Lingzhi,Ok, Yong Sik,Cao, Xinde Elsevier 2018 CHEMOSPHERE - Vol.211 No.-
<P><B>Abstract</B></P> <P>Biochar has shown a unique electrochemical property being involved in various redox reactions in soil and water. In this study, the electron donating capacities (EDCs) of biochar pyrolyzed at 200–800 °C from pine wood, barley grass and wheat straw were investigated by using the mediated electrochemical oxidation method. The EDC values for all biochar were in the range of 0.18–1.83 mmol e<SUP>−</SUP> (g biochar)<SUP>−1</SUP>, showing the increase as the temperature increased from 200 °C to 400 °C, the decrease from 400 °C to 650 °C, and then increase from 650 °C until to 800 °C. At low and intermediate temperatures of 200–650 °C, the EDCs were mainly attributed to the phenolic hydroxyl groups, while the conjugated π-electron system associated with aromatic structure dominated the EDCs of biochar at the high temperatures of over 650 °C. The barley grass- and wheat straw-derived biochar had higher EDCs than the pine wood-derived biochar, resulting from the higher phenolic hydroxyl groups in the former samples than the latter one. In conclusion, the reductive property of biochar was mainly attributed to both phenolic hydroxy group and conjugated π-electron system associated with aromatic structure, depending on the pyrolytic temperature and feedstock source. The results will help us to obtain a complete view on the role of biochar in biogeochemical redox reactions and consider developing biochar with controlled redox properties for specific environmental applications such as electron shuttle and catalyst material.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Quantification of the relationship between EDCs and phenolic groups and conjugate π-electron system were reported. </LI> <LI> At low and intermediate temperatures, the EDCs were mainly attributed to the phenolic groups. </LI> <LI> At high temperatures, the conjugated π-electron system associated with aromatic structure dominated the EDCs of biochar. </LI> <LI> Developing biochar with controlled redox properties was proposed for specific environmental applications. </LI> </UL> </P>
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Qingfang Zhang,Yingang Gui,Han Qiao,Xianping Chen,Lingzhi Cao 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
GIS plays an irreplaceable role in the modern electrical system. However, partial discharge will inevitablyoccur under insulation defect conditions and may lead to serious insulation malfunction. The online monitoringmethod based on gas sensor is a feasible method to diagnose the severity of partial discharge inGIS. In this paper, metal oxide (TiO2, Fe2O3, NiO) cluster-modified single-layer graphene was proposed asa novel gas sensor to detect the characteristic components of SF6 decomposition products, SOF2 andSO2F2. Density functional theory calculations were carried out to study the gas adsorption and sensingmechanisms. The adsorption structures of gas molecules and the metal oxide cluster-modified singlelayergraphene were built and optimized. Then, the most stable structure was selected to analyze the correspondingadsorption parameters. Calculation results showed that metal oxides decoration reduces theenergy gap, improving the electrical conductivity and enhancing the adsorption activity of the graphenesurface. According to DOS and CDD analyses, TiO2 modification obtained the best adsorption effect. Calculation results show that the metal-oxide-modified graphene sensor provides an effective methodfor effectively estimating the operating state of GIS by detecting SF6 decomposition products.
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