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- 저자 : Xuelin Wang (검색결과 5 건)
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Researches on two-phase flows around a hydrofoil using Shan-Chen multi-phase LBM model
Xuelin Tang,Shangyu Yang,Fujun Wang 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.2
In this paper, the Shan-Chen-type multiphase lattice Boltzmann model was proposed to investigate two-phase flows around a hydrofoil. In the model, The Shan-Chen force accounts for the attraction force calculated over nearest neighbours of the pseudopotential function, which is employed to mimic the molecular interactions that cause phase segregation. Firstly, the lattice Boltzmann model was validated by the liquid flows around a hydrofoil by means of comparison of drag coefficients and the Shan-Chen model was validated by the Laplace law. And then aiming at various existing bubbles of different radii preplaced above the hydrofoil leading edge, the evolution of gasliquid two-phase flows was successfully reproduced based on heterogeneous cavitation assumption. The shedding bubbles become smaller and smaller downstream the hydrofoil, and finally collapse behind the tailing edge. The inter-particle forces are analyzed based on the two-phase flow density, and then the corresponding pseudo-velocity distribution is predicted near the phase interface. Then the attached cavitating flows is studied based on homogeneous cavitation assumption. It can be concluded that the attached cavitation occurs and evolves under some reasonable conditions. It can be found that that a small change in the velocity or pressure will bring great influence on the bubble size. All the above-analyses demonstrate that Shan-Chen multiphase model can capture well the inter-phase force and can be treated as an alternative potential approach for predicting cavitating flows.
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Chuang Jiang,Lei Wang,Xuexiang Yu,Shenshen Chi,Tao Wei,Xuelin Wang 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.2
The mining subsidence in mining area could cause large-gradient deformation in a short period of time. When the deformation gradient exceeds the threshold value of the Differential Interferometry Synthetic Aperture Radar (D-InSAR) technology monitoring gradient, D-InSAR technology is likely to cause the failure of InSAR phase unwrapping algorithm. At this time, the InSAR technology is unable to monitor the 3D surface deformation. Aiming at these problems, an dynamic probability integral method (DPIM)-based InSAR phase unwrapping model and a method of extracting 3D surface deformation were proposed. The phase unwrapping model firstly used the empirical parameters of the probability integral of the mining face to predict the line of sight (LOS) direction deformation phase of the mining subsidence surface. Secondly, the phase of differential interferogram was unwrapped with the assist of the predicted LOS deformation phase under the constraint of DPIM, and the true LOS deformationphase was obtained, then the true LOS deformation phase transformed into LOS deformation. Finally, according to the geometric projection relationship between the LOS deformation and 3D deformation of mining subsidence surface, the probability integral prior model was brought into the equation of the geometric projection relationship. On the basis of relevant boundary conditions, the 3D surface deformation was extracted from the LOS direction deformation field of mining subsidence. The feasibility of the method was verified by the simulation experiment results. The differential interferogram of the subsidence basin was obtained by the differential interference processing of image data of Sentinel-1A on Nov. 16, 2017 and Dec. 10, 2017 of 1613 working face of Guqiao South Mine. By using the DPIM-based phase unwrapping model, the phase of differential interferogram was unwrapped and the 3D surface deformation during this period as well as the deformation extraction method were developed. The results showed that the maximum fitting error value of subsidence was 79 mm, about 8.33% of the maximum value of subsidence, and the fitting error of mean square of subsidence was ±33.5 mm. The results showed that the DPIM-based phase unwrapping model and the method of extracting 3D surface deformation proposed in this paper have certain engineering application values.
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Xue Lin,Haiyan Wang,Xiaoyan Pu 한국유전학회 2020 Genes & Genomics Vol.42 No.11
Background The acute hypoxic injury caused by the plain population entering the plateau in a short period of time hasbecome the main cause of endangering the health of the people who rush into the plateau. Objective The study aimed to identify the key genes which participate in resisting the acute hypoxic injury in SD Rats bytranscriptomic profile analysis. Methods 48 Sprague Dawley (SD) male rats were enrolled and randomly divided into four groups (0h, 24h, 48h, 72h) andhoused in hypobaric hypoxia chamber with altitude 6000m for different periods of time to make them acute hypoxic injury. The transcriptomic profile of the lung tissue of the rats was analysed by RNA second-generation sequencing combined withbioinformatics analysis. Results The results of GO and KEGG function classification analysis revealed that the differential expression genes enrichedin steroid hormone synthesis pathway especially in 48h group compared to F0 group. Further analysis revealed that FarnesylDiphosphate Farnesyl Transferase 1 (fdft1) gene encoding a rate-limiting enzyme in steroid hormone synthesis pathway wassignificant differently expressed between the groups. The expression levels of fdft1 gene were further verified by RT-PCRand Western-blot methods. Conclusions The results suggest that fdft1 gene plays an important role in responding to acute hypoxic injury by regulatingsteroid hormone biosynthesis.
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Designing Fault-Tolerant Photovoltaic Systems
Xue Lin,Yanzhi Wang,Pedram, Massoud,Jaemin Kim,Naehyuck Chang IEEE Computer Society 2014 IEEE design & test Vol.31 No.3
<P>PV systems are subject to PV cell faults, which lower the output power and shorten the lifespan of the system. This paper presents the design principles and runtime control algorithms of a fault-tolerant PV system which can detect and bypass PV cell faults in situ without any manual interventions.</P>
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Xue Lin,Xiaoyu Guo,Di Liu,Qingwei Wang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.2
Ag/Bi4Ti3O12 heterostructure with high photocatalytic activity was synthesized via a simple and practical hydrothermal method by using Bi4Ti3O12 nanobelts as substrate materials. The as-prepared Ag/Bi4Ti3O12 heterostructure included Ag quantum dots assembling uniformly on the surface of Bi4Ti3O12 nanobelts. Comparing with pure Bi4Ti3O12 nanobelts, the composite photocatalyst exhibited enhanced photocatalytic activity under visible light irradiation in the decomposition of rhodamine B aqueous solution. The enhancement performance is believed to be induced by the intimate contact interface, where silver quantum dots serve as good electron acceptor for facilitating quick photoexcited electron transfer and thus decreasing electron-hole recombination. It was also found that the photodegradation of rhodamine B molecules is mainly attributed to the oxidation action of the generated O2 radicals.
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