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Extended Homogeneous Balance Method and Lax Pairs,Backlund Transformation

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Communications in Theoretical Physics 2002年第6期37卷 645-648页

作者： bai Cheng-lin Department of Communication Engineering Liaocheng Teachers' College Liaocheng 252059 Shandong Province China

Using the extended homogeneous balance method, which is very concise and primary, Lax pairs and Backlund transformation for most nonlinear evolution equations, such as the compound KdV-Burgers equation and nonlinear d... 详细信息

关键词：非线性偏微分方程齐次平衡法 Lax对孤子系统

A CONSERVATIVE COUPLED FLOW/TRANSPORT MODEL WITH ZERO MASS ERROR

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维普期刊数据库

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Journal of Hydrodynamics 2009年第2期21卷 166-175页

作者： bai Lu-hai JIN Sheng State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology Dalian 116024China

A fully conservative form applied to a coupled system of two-dimensional water flow and solute motion is presented. A cell-centred finite volume method based on Roe＇s approximate Riemann solver with unstructured grids is formulated. The bed slope source terms are discretized following an upwind approach and a semi-implicit treatment is used for the friction source terms. The centered discretization of the diffusion terms is in an implicit way. It is shown that this numerical technique reproduces almost exactly the steady state of still water and enables to achieve zero numerical errors in unsteady flow over configurations with strong variations on bed slope. The model ensures a global conservation and positive values of both water level and solute concentration. Numerical results show the effectiveness of the model in solute transport over real complex geometries.

关键词： transport model shallow water flow coupled model wetting/drying conditions conservation complex topography

Aero-Hydrodynamic Coupled Dynamic Characteristics of Semi-Submersible Floating Offshore Wind Turbines Under Inflow Turbulence

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China Ocean Engineering 2023年第4期37卷 660-672页

作者： JIANG hai-rui bai Xing-lan Murilo A.VAZ School of Naval Architecture and Maritime Zhejiang Ocean UniversityZhoushan 316022China Key Laboratory of Offshore Engineering Technology of Zhejiang Province Zhoushan 316022China Ocean Engineering Program Federal University of Rio de JaneiroRio de JaneiroBrazil

In this study,the frequency characteristics of the turbulent wind and the effects of wind-wave coupling on the low-and high-frequency responses of semi-submersible floating offshore wind turbines(FOWT)are *** wave load components,such as first-order wave loads,combined first-and second-order difference-frequency wave loads,combined first-and second-order sum-frequency wave loads,and first-and complete second-order wave loads are taken into consideration,while different turbulent environments are considered in aerodynamic *** com-parison is based on time histories and frequency spectra of platform motions and structural load responses and statistical *** findings indicate that the second-order difference-frequency wave loads will significantly increase the natural frequency of low-frequency motion in the responses of the platform motion and structure load of the semi-submersible platform,which will cause structural fatigue *** the action of turbulent wind,the influences of second-order wave loads on the platform motion and structural load response cannot be ignored,especially under extreme sea ***,in order to evaluate the dynamic responses of semi-submersible FOWT more accurately,the actual environment should be simulated more realistically.

关键词： turbulence characteristics floating offshore wind turbines second-order hydrodynamic loads low-and high-frequency responses aero-hydrodynamic coupling

Prediction Model of Kinetic Energy Conversion of Tandem Dual-Oscillator Based on Flow-Induced Vibration Experiment

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China Ocean Engineering 2022年第5期36卷 707-719页

作者： bai Xu SUN Meng HAN Chuan-yu SUN hai School of Naval Architecture&Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China Marine Renewable Energy Laboratory Department of Naval Architecture&Marine EngineeringUniversity of MichiganAnn Arbor MI 48109-2145USA College of Aerospace and Civil Engineering Harbin Engineering UniversityHarbin 150001China

Flow-induced vibration energy harvesting devices typically use an elastically supported body immersed in an oncoming flow to convert the sea and river current's hydrokinetic energy into electrical *** proportion of energy the device collects is greatly influenced by parameters such as the water flow velocity,spacing between device components,structure size,and damping *** parameter optimization and performance predictions of flow-induced vibration energy harvesting devices,we train a model of the power harvesting efficiency under different damping ratios,stiffnesses,spacing ratios,and reduced velocities based on experimental *** improve the prediction accuracy,a feedforward network structure is optimized by using the topological evolutionary algorithm and a radial basis function *** analysis reveals that the radial basis function network model provides the best agreement with the experimental results and realizes accurate predictions of the power harvested by a dual-oscillator system in the vortex-induced vibration,transition region,and *** prediction results show that the model's maximum power harvesting efficiency occurs in the vortex-induced *** efficiency increases and then decreases with increasing stiffness and reduced velocity in this phase;an increase in the spacing ratio causes the effi-ciency to decrease and then increase;finally,increasing the damping ratio enhances the *** device achieves maximum power harvesting efficiency at a reduced velocity of U_(r)=*** proposed model effectively predicts the maximum efficiency and the corresponding damping ratio and stiffness of the vortex-induced vibration and galloping,providing a new method for predicting tandem dual-oscillator hydrodynamic power conversion in flow-induced vibration.

关键词： flow-induced vibration tandem double-oscillator radial basis function prediction

Ion Acceleration in Laser-Plasma Interaction: Shock, Sheath, and Scaling

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Communications in Theoretical Physics 2009年第6期51卷 1125-1128页

作者： XIE bai-Song WU hai-Cheng Key Laboratory of Beam Technology and Materials Modification of the Ministry of Education Beijing Normal University Beijing 100875 China College of Nuclear Science and Technology Beijing Normal University Beijing 100875 China

Some notes and comments on ion acceleration in laser-plasma interaction is given, in particular for the implication of shock, sheath and sealing. A simple model is proposed for ion acceleration by the combination of shock and sheath. The obtained scaling relations between the maximum ion energy and laser parameters （power, pulse duration） as well plasma parameter （plasma density）for example α PL 7/12 Eion,max α TL1/3 and Eion,max α ne2/3,are compared to the previous works. Some deficiencies and implications of model and results are discussed.

关键词： laser-plasma acceleration shock waves plasma sheaths

Recognition of Biotin-functionalized Liposomes

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Chinese Chemical Letters 2003年第8期14卷 832-835页

作者： hai Feng ZHU Jun bai LI International Joint Lab The Center for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing 100080

Functionalized liposomes were prepared by mixing the biotin in the lipid vesicle suspensions. The experiments through immersing streptavidin deposited mica into the biotin modified liposome solution testify the spec... 详细信息

关键词： Recognition liposome TEM AFM.

Effect of Spacers on CMCs and Micelle-forming Enthalpies of Gemini Surfactants by Titration Microcalorimetry

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Chinese Chemical Letters 2000年第12期11卷 1095-1096页

作者： Guang Yue bai hai Ke YAN Institute of Chemistry the Chinese Academy of SciencesBeijing 100080

The critical micelle concentrations (CMC) and the micelle-forming enthalpies (DeltaH(mic)) of gemini surfactants were first measured by the precise titration microcalorimetry. The results showed that DeltaH(mic) values are negative, and there is an exothermal minimum between s=4 and s=6. Furthermore. the CMCs of the surfactants are in good agreement with literature values.

关键词： gemini surfactants micelle-forming enthalpy CMC microcalorimetry

Low temperature solid-state synthesis and characterization of uniform YF_3 submicroparticles

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Rare Metals 2014年第5期33卷 604-607页

作者： Hao Fang Hua-Lan Xu lin-Jie bai Dong-Dong Guo Sheng-Liang Zhong Yun-hai Lv College of Chemistry and Chemical Engineering Jiangxi Normal University Institute of Physics and Communication Engineering Jiangxi Normal University

In this paper, submicro-scaled YF3 particles with uniform rice-like morphologies were facilely synthesized by reacting yttrium nitrate with tetrabutylammonium fluoride via a solid-state reaction process at 50 °C for 12 *** phase confirmation and morphology of the as-prepared YF3 particles were investigated by X-ray powder diffraction（XRD） and scanning electron microscopy（SEM）.SEM results reveal that the YF3 submicroparticles are about 700 nm in length and 260 nm in width. Eu^3＋ and Tb^3＋ doped YF3 submicroparticles were also prepared with similar process and their photoluminescence properties were studied. Results demonstrate that the doping of Eu^3＋ and Tb^3＋ has slight effect on the morphologies of the product. Owing to the small average crystallite size or the low crystallinity of the product, the photoluminescence intensity of the Eu^3＋ and Tb^3＋ doped YF3 submicroparticles is very weak. Some characteristic peaks even cannot be observed in the emission spectrum.

关键词： Yttrium fluoride submicroparticles Solid-state reaction Low temperature Photoluminescence

Boundary Behaviors for a Continuous-state Nonlinear Neveu’s Branching Process

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Acta Mathematica Sinica,English Series 2024年第8期40卷 2005-2016页

作者： lin Yu bai Xu YANG School of Mathematics and Information Science North Minzu UniversityYinchuan 750021P.R.China

By generalizing a criterion of Mufa Chen for Markov jump processes,we establish the necessary and sufficient conditions for the extinction,explosion and coming down from infinity of a continuous-state nonlinear Neveu... 详细信息

关键词： Continuous-state branching process nonlinear branching Neveu’s branching extinction explosion coming down from infinity