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RISS 인기검색어
- 검색키워드
- 저자 : Tairan Wang (검색결과 6 건)
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An Epidemic Model of Information Dissemination in Mobile Social Networks
Wang Weiguo,Chu Chen,Liu Jinzhuo,Li Tairan 보안공학연구지원센터(IJUNESST) 2015 International Journal of u- and e- Service, Scienc Vol.8 No.1
In this paper, we propose a new model for information dissemination in mobile social networks. The dynamic equation of information dissemination is modified. Moreover, we investigate numerically the behavior of the model on a real scale-free social site with the exponent γ =1.08. We find that initial spreaders with big out-degree of can accelerate information dissemination, and the nodes with large in-degree would be easier to be a spreader or to become to stiflers.
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Effects of fluid thermophysical properties on cavitating flows
Tairan Chen,Biao Huang,Guoyu Wang,Kun Wang 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.10
We studied the thermo-fluid cavitating flows and evaluated the effects of physical properties on cavitation behaviors. The thermo-fluid(including liquid nitrogen, liquid hydrogen and hot water) cavitating flows around a 2D hydrofoil were numerically investigated. TheFavre-averaged Navier-Stokes equations with the enthalpy-based energy equation, transport equation-based cavitation model, and the k-ω SST turbulence model were applied. The thermodynamic parameter Σ, defined as ( 2 2 ) / ( 2 ) v l v l r L r C T e ¥ å = was used to assess thethermodynamic effects on cavitating flows. The results manifest that the thermal energy solution case yields a substantially shorter andmushier cavity attached on the hydrofoil due to the thermodynamic effects, which shows better agreement with the experimental data. The temperature drop inside the cavity decreases the local saturated vapor pressure and hence increases the local cavitation number; itcould delay or suppress the occurrence and development of the cavitation behavior. The thermodynamic effects can be evaluated bythermophysical properties under the same free-stream conditions; the thermodynamic parameter Σ is shown to be critical in accuratelypredicting the thermodynamic effects on cavitating flows. The surrogate-based global sensitivity analysis of liquid nitrogen cavitatingflow suggests that ρv, Cl and L could significantly influence temperature drop and cavity structure in the existing numerical framework,while ρv plays the dominant role on temperature drop when properties vary with changing temperature. The liquid viscosity ml slightlyaffects the flow structure but hardly affects the temperature distribution.
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Role of Tie Strength in Information Dissemination in Mobile Social Networks
Wang Weiguo,Chu Chen,Liu Jinzhuo,Li Tairan 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.3
In this paper, we propose a new model for information dissemination in mobile social networks, in which the infectious probability is defined as a function of the homogeneity and heterogeneity between nodes. Moreover, we investigate numerically the behavior of the model on a real scale-free social site with the exponent γ =1.08. We find that weak ties between nodes play an important role in information dissemination process. Specially, selecting weak ties preferentially can make information spread faster and wider, and the efficiency of diffusion will be greatly affected after removing them.
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Size-dependent dynamic stability of a FG polymer microbeam reinforced by graphene oxides
Yuewu Wang,Ke Xie,Tairan Fu 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.73 No.6
The dynamic stability of a functionally graded polymer microbeam reinforced by graphene oxides subjected to a periodic axial force is investigated. The microbeam is assumed to rest on an elastic substrate and is subjected to various immovable boundary restraints. The weight fraction of graphene oxides nanofillers is graded across the beam thickness. The effective Young's modulus of the functionally graded graphene oxides reinforced composite (FG-GORC) was determined using modified Halpin–Tsai model, with the mixture rule used to evaluate the effective Poisson's ratio and the mass density. An improved third order shear deformation theory (TSDT) is used in conjunction with the Chebyshev polynomial-based Ritz method to derive the Mathieu-Hill equations for dynamic stability of the FG-GORC microbeam, in which the scale effect is taken into account based on modified couple stress theory. Then, the Mathieu-Hill equation was solved using Bolotin's method to predict the principle unstable regions of the FG-GORC microbeams. The numerical results show the effects of the small scale, the graphene oxides nanofillers as well as the elastic substrate on the dynamic stability behaviors of the FG-GORC microbeams.
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Tao Wan,Songsong He,Tairan Wang,Jian Wang,Mingrui Yu,Yang Jianbo,Qi Tang 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.11
Polyethylenimine(PEI)-modified magnetic hydrogel nanocomposite absorbents (PEI-mHNAs) were fabricated based on poly(acrylamide-co-acrylic acid) and PEI-modified magnetic nanoparticles by radical copolymerization. FTIR and XRD results preliminarily confirmed the target structure of PEI-mHNAs without destroying the structure of magnetic nanoparticles during modification and radical copolymerization. PEI-mHNAs with many rough porous and interstitial structure had high adsorption capacity of Cu(II) (217mg/g), Cd(II) (232mg/g) and Pb(II) (459mg/g). PEI-mHNAs had the best absorption capacity for heavy metal ions in the synthesis condition of acrylic acid/acrylamide mass ratio of 60 : 40, 0.8% initiator, AA neutralization degree of 70%, 0.75% crosslinker, and 15% PEImodified magnetic nanoparticles. Moreover, PEI-mHNAs had good magnetic responsiveness, high thermal stability and reusability, which make it a potential application in removing heavy metal ions from the contaminated wastewater.
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Xing’an Zhao,Biao Huang,Tairan Chen,Guoyu Wang,Deming Gao,Jing Zhao 대한기계학회 2017 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.31 No.2
We used computational modeling to investigate the cavitation performance of an aviation fuel pump, and optimize structural parameters using the surrogate-based method. In the numerical simulation, a rotation-curvature correction was adapted to the k-ε turbulence model, and a four-component surrogate fuel was selected to reproduce the physical properties of the China RP-3 kerosene. Then the performance of the aviation fuel pump was predicted. In the optimization, based on the series of the numerical results, Surrogate-based analysis and optimization (SBAO) was used to optimize the structural parameters of the fuel pump (the variation of the outlet blade angle for the inducer △β b1 and the variation of the inlet blade angle for the impeller △β b2 ). The results show that the prediction of cavitation performance agrees well with the experimental data. The results show that cavitation areas are mainly distributed in the inlet of the inducer. The volume of cavities grows with the decreasing NPSHa. The head of the fuel pump has a sudden head-drop when NPSHa ≤ 5.64 m. Furthermore, the surrogate-based approach is available in structural optimization of the fuel pump. The cavitation performance of the optimized pump improved about 22 % with a little drop of head coefficient when △β b1 = 4.33° and △β b2 = 3.24°. The numerical approach employed in this paper can accurately predict the cavitating flow of the high rotating speed fuel pump and the surrogate-based method is available in the structural optimization for a better cavitation performance.
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