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- 저자 : Yongyi Lin (검색결과 4 건)
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Robust Adaptive Finite-time Fault-tolerant Control for Dynamic Positioning of Vessels
Yongyi Lin,Jialu Du,Jian Li 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.9
In this paper, a novel robust adaptive finite-time fault-tolerant control (FTC) scheme is presented for the dynamic positioning (DP) of vessels under thruster faults with unknown model parameters and environmental disturbances. The thruster effectiveness factor to express the loss-of-effectiveness fault state is transformed into a new unknown parameter, which is obtained by the adaptive law. Furthermore, based on the finite-time control technique, neural networks (NNs) technique and the sliding mode differentiator, a novel robust adaptive finite-time FTC strategy is developed for DP of vessels by resorting the backstepping design technique. It is theoretically proved that the proposed FTC scheme can force the vessel arrive at the desired position and heading in a finite time, while guaranteeing the boundedness of all signals in the closed-loop of DP control system. Simulation study results are provided to demonstrate the effectiveness of the proposed FTC scheme.
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Mi, Longqing,Feng, Yongyi,Cao, Lei,Xue, Mingqiang,Huang, Yanlin,Qin, Lin,Seo, Hyo Jin Elsevier 2018 Spectrochimica acta. Part A, Molecular and biomole Vol.192 No.-
<P><B>Abstract</B></P> <P>Silver-containing lanthanum metaniobate Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> nanoparticles were synthesized by sol-gel polymerized complex method. A typical defect-perovskite structure was confirmed by XRD Rietveld refinements. The surface characteristics of the sample were tested by SEM, TEM and EDS measurements. SEM and TEM show that the sample presents ball-like particles with the diameters of 100nm to 400nm. The sample shows both self-activated luminescence and photocatalytic activities. Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> has a direct transition with band energy of 2.85eV. The Ag4d-O2p hybridization in the valence band contributes to the narrowed band gap. The luminescence properties of Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> have been investigated for the first time. The luminescence is characterized by two emission centers with maximum wavelength near 460 and 530nm. The emission and excitation spectra, decay curves and the thermal quenching mechanism were discussed. Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> shows the efficient photocatalytic activities and the photodegradation rate for methylene blue dye (MB) can reach about 95% under visible light (>420nm) irradiation in 5h. The trapped experiments for the active species were tested and discussed, which verified that OH radicals could be the major active species in photocatalysis.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new silver-containing metaniobate Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> was synthesized. </LI> <LI> Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> has a typical defect-perovskite structure. </LI> <LI> Ag<SUB>0.5</SUB>La<SUB>0.5</SUB>Nb<SUB>2</SUB>O<SUB>6</SUB> shows both self-activated luminescence and photocatalytic activities. </LI> <LI> The mechanisms of luminescence and photocatalysis were elucidated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Xu, Jian,Cao, Lei,Feng, Yongyi,Huang, Yanlin,Wang, Yaorong,Qin, Lin,Seo, Hyo Jin Elsevier 2017 Journal of luminescence Vol.183 No.-
<P><B>Abstract</B></P> <P>In<SUB>2</SUB>Si<SUB>2</SUB>O<SUB>7</SUB> is a known indium-based scintillator with fast ultraviolet photoluminescence. Unfortunately the emission only can be detected below 200K. the poor thermal stability limits its application at room temperature. In this work, the luminescence improvement of In<SUB>2</SUB>Si<SUB>2</SUB>O<SUB>7</SUB> was realized by F<SUP>−</SUP>-ions doping in the lattices. The ceramic phosphors were via typical solid-state reaction method. The pure crystalline phase with thortveirite-type structure was confirmed by X-ray diffraction (XRD) Rietveld refinements. The photoluminescence (PL) emission and excitation spectra together with the luminescence thermal stability were tested. The fluorescence decay curves CIE emission Stokes shifts were measured. The ceramic samples could present blue luminescence with maximum wavelength at about 340nm under the excitation of UV light or high energy X-ray irradiation. The pure sample only presents luminescence below 200K, however, the F-doping can be greatly enhance the luminescence thermal stability. The F-doped In<SUB>2</SUB>Si<SUB>2</SUB>O<SUB>7</SUB> could present emission signals with fast decay lifetime of 850ns at room temperature. The luminescence transitions from the In<SUP>3+</SUP>-O<SUP>2−</SUP> charge transfer (CT) were discussed on the structure properties.</P>
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A silver niobate photocatalyst AgNb<sub>7</sub>O<sub>18</sub> with perovskite-like structure
Liu, XuanXuan,Qin, Chuanxiang,Cao, Lei,Feng, Yongyi,Huang, Yanlin,Qin, Lin,Seo, Hyo Jin Elsevier 2017 Journal of Alloys and Compounds Vol.724 No.-
<P><B>Abstract</B></P> <P>Silver-containing niobate AgNb<SUB>7</SUB>O<SUB>18</SUB> nanoparticles were prepared via sol-gel polymerized complex synthesis. The sample was given a good XRD Rietveld refinement in a typical perovskite-like structure. The detailed surface properties of AgNb<SUB>7</SUB>O<SUB>18</SUB> nanoparticles were tested by SEM, EDS, TEM, nitrogen adsorption-desorption isotherms and XPS measurements. AgNb<SUB>7</SUB>O<SUB>18</SUB> is characterized via a direct transition and the band energy is 2.76 eV. The hybridization between O 2p and Ag 3d states in valence band contributes to the narrowed band gap. The first principles electronic structure elucidation supports the narrow band gap of AgNb<SUB>7</SUB>O<SUB>18</SUB>. The sample shows an efficient degradation of methylene blue dye (MB) solutions. The trapping tests were performed to elucidate the real active species in the photocatalytic reactions. The results indicate that the superoxide radical is the main active species in the photocatalytic system, and the photocatalyst also shows a good stability and durability.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new semiconductor nanoparticle AgNb<SUB>7</SUB>O<SUB>18</SUB> was prepared. </LI> <LI> The silver niobate has a typical perovskite-like structure. </LI> <LI> AgNb<SUB>7</SUB>O<SUB>18</SUB> shows an efficient absorption with a narrow gap 2.76 eV. </LI> <LI> AgNb<SUB>7</SUB>O<SUB>18</SUB> has an efficient photocatalytic activity on MB photo-degradation. </LI> <LI> The photocatalysis mechanism and stabilities were discussed. </LI> </UL> </P>
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