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Nonlinear Dynamics of the Generalized Thirring System
Ying Wang,Qingchun Zhou,Yu Zhou 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.2
We investigate the dynamics of the (1+1)-dimensional nonlinear Dirac equation generalized from the traditional Thirring model. The effects of a diagonal external potential and a parameterized nonlinearity on the features of the system’s dynamical evolution are highlighted, specifically for a Zeeman-field external potential and a nonlinear parametric setting, which lead to bright soliton features.
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Effect of boundary mobility on nonlinear pulsatile-flow induced dynamic instability of FG pipes
Zhoumi Wang,Yiru Ren,Qingchun Meng 국제구조공학회 2023 Structural Engineering and Mechanics, An Int'l Jou Vol.86 No.6
In practical engineering such as aerial refueling pipes, the boundary of the fluid-conveying pipe is difficult to be completely immovable. Pipes under movable and immovable boundaries are controlled by different dominant nonlinear factors, where the boundary mobility will affect the nonlinear dynamic characteristics, which should be focused on for adopting different strategies for vibration suppression and control. The nonlinear dynamic instability characteristics of functionally graded fluidconveying pipes lying on a viscoelastic foundation under movable and immovable boundary conditions are systematically studied for the first time. Nonlinear factors involving nonlinear inertia and nonlinear curvature for pipes with a movable boundary as well as tensile hardening and nonlinear curvature for pipes with an immovable boundary are comprehensively considered during the derivation of the governing equations of the principal parametric resonance. The stability boundary and amplitude-frequency bifurcation diagrams are obtained by employing the two-step perturbation- incremental harmonic balance method (TSP-IHBM). Results show that the movability of the boundary of the pipe has a great influence on the vibration amplitude, bifurcation topology, and the physical meanings of the stability boundary due to different dominant nonlinear factors. This research has guidance significance for nonlinear dynamic design of fluid-conveying pipe with avoiding in the instability regions.
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Miao Shui,Yue Song,Qingchun Wang,Yuanlong Ren 한국물리학회 2010 Current Applied Physics Vol.10 No.5
Titania based ceramics are promising materials for environmental sensors, high efficiency photocatalyst. Ion doping is an effective method to improve the properties by modifying their microstructure and phase composition. In this study, TiO2 particles doped with Fe3+ were prepared by sol-gel method using Ferric nitrate and tetrabutyl titanate as precursors. Fe3+ was incorporated in the TiO2 matrix during thermal treatment in different temperatures. Thermal analysis, TEM and X-ray diffraction were used to characterize the TiO2 powder. Microstructure, phase content, and cell parameters were calculated according to Rietveld refinement software GSAS. The interaction mechanism of Fe3+ in crystal lattice of titanium dioxide and the crystal growth kinetics of Fe3+-doped TiO2 are discussed.
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Miao Shui,Weidong Zheng,Jie Shu,Qingchun Wang,Shan Gao,Dan Xu,Liangliang Cheng,Lin Feng,Yuanlong Ren 한국물리학회 2013 Current Applied Physics Vol.13 No.3
Lithium-ion battery cathode material Li1þxV3O8 is synthesized by a citric acid/tartaric acid assisted sol egel method and sintered at 350 C, 450 C and 550 C for 3 h for the formation of Li1þxV3O8 phase. The synthesized samples were fully characterized by FTIR, TG/DTA, XRD, SEM, EIS and chargeedischarge tests. Li1þxV3O8 material synthesized by tartaric acid assisted route and sintered at 450 C for 3 h shows best electro-chemical performance. It shows a high initial capacity of 249 mAh g1 and still reserves a discharge capacity of 260 mAh g1 after 50 cycles. Moreover, in the case of tartaric assisted products, no capacity decadence is observed in 50 cycles. XRD together with TG/DTA measurements reveal that compared with citric acid assisted products, the adoption of tartaric acid as chelating agent effectively lowers the crystallization temperature of amorphous Li1þxV3O8. Therefore, precursors obtained by tartaric acid route calcinated at 450 C for 3 h exhibit lower crystallinity and smaller grain size, which contributes to the better electrochemical performance of the cathode electrodes. From EIS measurements, the bulk resistance is reduced, which favors the intercalation and de-intercalation of lithium ions while cycling.
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