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Numerical Analysis and Verification of the Gas Jet from Aircraft Engines Impacting a Jet Blast Deflector

Chinese Journal of Mechanical Engineering 2018年第5期31卷 127-137页

作者： Fu-dong Gao De-Xin wang hai-dong wang Ming-Ming Jia Department of Carrier Aviation Security and Station Management Naval Aeronautical University

The process of the gas jet from aircraft engines impacting a jet blast deflector is not only a complex fluid–solid coupling problem that is not easy to compute, but also a safety issue that seriously interferes with flight deck envi?ronment. The computational fluid dynamics(CFD) method is used to simulate numerically the impact e ect of gas jet from aircraft engines on a jet blast deflector by using the Reynolds?averaged Navier?Stokes(RANS) equations and turbulence models. First of all, during the pre?processing of numerical computation, a sub?domains hybrid meshing scheme is adopted to reduce mesh number and improve mesh quality. Then, four di erent turbulence models includ?ing shear?stress transport(SST) k-w, standard k-w, standard k-ε and Reynolds stress model(RSM) are used to compare and verify the correctness of numerical methods for gas jet from a single aircraft engine. The predicted values are in good agreement with the experimental data, and the distribution and regularity of shock wave, velocity, pressure and temperature of a single aircraft engine are got. The results show that SST k?w turbulence model is more suitable for the numerical simulation of compressible viscous gas jet with high prediction accuracy. Finally, the impact e ect of gas jet from two aircraft engines on a jet blast deflector is analyzed based on the above numerical method, not only the flow parameters of gas jet and the interaction regularity between gas jet and the jet blast deflector are got, but also the thermal shock properties and dynamic impact characteristics of gas jet impacting the jet blast deflector are got. So the dangerous activity area of crew and equipments on the flight deck can be predicted qualitatively and quantitatively. The proposed research explores out a correct numerical method for the fluid–solid interaction during the impact process of supersonic gas jet, which provides an e ective technical support for design, thermal ablation and structural damage analysis

关键词： Aircraft engine Gas jet Computational fluid dynamics Jet blast deflector Impact effect

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Design, synthesis and antibacterial activity of novel pleuromutilin derivatives with 4H-pyran-4-one and pyridin-4-one substitution in the C-14 side chain

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Chinese Chemical Letters 2016年第2期27卷 235-240页

作者： Chen-Yu Ling Yun-Liang Tao Wen-Jing Chu Hui wang hai-dong wang Yu-She Yang State Key Laboratory of Drug Research Shanghai Institute of Materia Medica Chinese Academy of Sciences School of Petrochemical Engineering Changzhou University Department of Microbiology China Pharmaceutical University

A series of novel pleuromutilin derivatives with 4H-pyran-4-one and pyridin-4-one substitution in the C-14 side chain have been designed and synthesized. In vitro antibacterial activity evaluation showed that most of the derivatives exhibited potent antibacterial activity against drug resistant Gram-positive strains. Compounds 12 a, 12 d, and 28 are the most active derivatives in this series, displaying activity comparable to that of retapamulin and BC-3781. As the metabolic stability of this series is not satisfactory, further modifications are going on to improve their pharmacokinetic profile.

关键词： Multi-drug resistant bacteria Pleuromutilin 4H-Pyran-4-one Antibacterial activity

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Catalyzed oxidation of 2,6-dimethylphenol in Triton X-100 micellar solution

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Chinese Chemical Letters 2007年第3期18卷 349-351页

作者： Jie Zhu Xiang Guang Meng hai dong wang Shan dong Liu Qin Hui Pang Juan Du Xian Cheng Zeng College of Chemistry Sichuan University Chengdu 610064 China Bio-Chemistry Experimental Center Jiaxing College Jiaxing 314001 China College of Physics Science Qingdao University Qingdao 266071 China

The oxidative coupling reaction of 2,6-dimethylphenol with H202 catalyzed by a copper（H） Schiff complex in aqueous and Triton X-100 micellar solution under mild conditions was investigated. The kinetics of formation of 3,3＇,5,5＇-tetramethyl-4,4＇- diphenoquinone （DPQ） was studied. Rate constant k2 were obtained. The optimum pH for DPQ generation reaction is 7.25. The main product was DPQ in aqueous buffer solution, but PPE and the oxidized products of PPE remained in Triton X-100 micellar solution.

关键词： 2,6-Dimethylphenol Oxidative coupling Micelle Kinetics

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Spectral properties of Pr:CNGG crystals grown by micro-pulling-down method

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Chinese Physics B 2019年第8期28卷 345-348页

作者： Yan-Yan Xue Na Li dong-Hua Hu Qing-Song Song Xiao-dong Xu dong-hai wang Qing-Guo wang dong-Zhen Li Zhan-Shan wang Jun Xu School of Physics Science and Engineering Institute for Advanced StudyTongji UniversityShanghai 200092China Jiangsu Key Laboratory of Advanced Laser Materials and Devices School of Physics and Electronic EngineeringJiangsu Normal UniversityXuzhou 221116China

Pr^3+-doped calcium niobium gallium garnet(Pr:CNGG)single crystals with different Pr^3+concentrations are successfully grown by the micro-pulling-down(μ-PD)*** crystal structure,room-temperature absorption spectra,and fluorescence spectra of Pr:CNGG crystals are measured and *** fluorescence results indicate their large dependence on the doping *** fluorescence lifetime of the 1D2 energy level is also *** results indicate that Pr:CNGG crystal could be a potential solid-state laser gain medium.

关键词： Pr:CNGG μ-PD method spectral properties

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Experimental investigation of hollow-core photonic crystal fibers with five photonic band-gaps

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Optoelectronics Letters 2008年第4期4卷 253-256页

作者： YUAN Jin-hui HOU Lan-tian WEI dong-bin wang hai-yun ZHOU Gui-yao Institute of Infrared Optical Fibers and Sensors College of Information Science and Engineering Yanshan UniversityQinhuangdao 066004 China

The hollow-core photonic crystal fibers （HC-PCFs） with integrity structure have been fabricated with an improved twice stack-and-draw technique. The transmission spectrum shows that five photonic band-gaps within 45... 详细信息

关键词：中空光子晶体光纤光子带隙实验研究光学元件

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Inhibition of Xanthine Oxidase Activity by Gnaphalium Affine Extract

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Chinese Medical Sciences Journal 2014年第4期29卷 225-230页

作者： Wei-qing Lin Jian-xiang Xie Xiao-mu Wu Lin Yang hai-dong wang Nanchang University School of Medicine Graduate School Department of Integrated Traditional Chinese Medicine and Western Medicine Jiangxi Provincial People's Hospital Department of Integrated Traditional Chinese Medicine and Western Medicine Jiangxi Provincial Children's Hospital

Objective To evaluate the inhibitory effect of Gnaphalium affine extracts on xanthine oxidase(XO) activity in vitro and to analyze the mechanism of this effect. Methods In this in vitro study, Kinetic measurements were performed in 4 different inhibitor concentrations and 5 different xanthine concentrations(60, 100, 200, 300, 400 μmol/L). Dixon and Lineweaver-Burk plot analysis were used to determine Ki values and the inhibition mode for the compounds isolated from Gnaphalium affine extract. Results Four potent xanthine oxidase inhibitors were found in 95% ethanolic(v/v) Gnaphalium affine extract. Among them, the f lavone Eupatilin exhibited the strongest inhibitory effect on XO with a inhibition constant(Ki) of 0.37 μmol/L, lower than the Ki of allopurinol(4.56 mol/L), a known synthetic XO inhibitor. Apigenin(Ki of 0.56 μmol/L, a proportion of 0.0053‰ in Gnaphalium affine), luteolin(Ki of 2.63 μmol/L, 0.0032‰ in Gnaphalium affine) and 5-hydroxy-6,7,3',4'-tetramethoxyflavone(Ki of 3.15 μmol/L, 0.0043‰ in Gnaphalium affine) also contributed to the inhibitory effect of Gnaphalium affine extract on XO activity. Conclusions These results suggest that the use of Gnaphalium affine in the treatment of gout could be attributed to its inhibitory effect on XO. This study provides a rational basis for the traditional use of Gnaphalium affine against gout.

关键词： xanthine oxidase gout uric acid gnaphalium affine

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Convenient room-temperature synthesis of sulfur and nitrogen co-doped NiCo-LDH coupled with CNTs on NiCo foam as battery-type electrode for high performance hybrid supercapacitor

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Rare Metals 2024年第9期43卷 4286-4301页

作者： Li Song Xiao-Hong Zhong Fang-Lin wang Zhi-Hui Huang Zhe Hong Yun-Fang Gao hai-dong wang Jian-Wei Ren Sheng-Jie Peng Lei Li College of Biological Chemical Sciences and EngineeringJiaxing UniversityJiaxing 314001China College of Chemical Engineering Zhejiang University of TechnologyHangzhou 310014China College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China Research and Development Department Jiangxi Ganfeng LiEnergy Technology Co.Ltd.Xinyu 338000China Department of Mechanical Engineering Science University of JohannesburgAuckland ParkJohannesburg 2092South Africa

The convenient synthesis of the composite electrode with high supercapacitance performance plays an important role in practical application but is ***,the carbon nanotubes(CNTs)coupled with lowcrystalline sulfur and nitrogen co-doped Ni Co-LDH(denoted as SN-Ni Co-LDH)nanosheets array are grown on Ni Co foam(NCF)substrate by two convenient steps of metal induced self-assembly and corrosion engineering,which present the advantages of operating at roomtemperature and low preparation *** from the S–N co-doping and low-crystallinity of Ni Co-LDH,the prepared SN-Ni Co-LDH@CNTs@NCF electrode presents a topping charge capacity of 2470 C·g^(-1)(4.94 C·cm^(-2))at 5 m A·cm^(-2).Furthermore,the fabricated asymmetry supercapacitor(ASC)achieves an extraordinary energy density of 77 Wh·kg^(-1)(0.617 m Wh·cm^(-2))at a power density of 438 W·kg^(-1)(3.5 m W·cm^(-2))and outstanding stability(91%capacity retention after 5000 cycles at20 m A·cm^(-2)).Impressively,the structure evolution of Ni Co-LDH during the charge/discharge processes has been thoroughly elucidated by in-situ Raman ***,this work verifies a powerful strategy and practical value for preparing composite electrodes with high supercapacitance performance,and also provides guidance for the rational design of the smart electrodes.

关键词： Supercapacitor NiCo-LDH Carbon nanotubes Sulfur and nitrogen co-doped Convenient synthesis

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2-D NUMERICAL SIMULATION OF FLOODING EFFECTS CAUSED BY SOUTH-TO-NORTH WATER TRANSFER PROJECT

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Journal of Hydrodynamics 2008年第5期20卷 662-667页

作者： SUN dong-po XUE hai wang Peng-tao LU Rui-li LIAO Xiao- long North China University of Water and Hydroelectric Power Zhengzhou 450011 China Institute of Civil and Water Conservancy Ningxia University Yinchuan 750021 China China Pearl River Water Resources Planning Designing Surveying Co. Ltd. Guangzhou 510610 China

Since the General Channel designed for the South-to-North Water Transfer Project in China has to cross many rivers and streams flowing from west to east, there are potentially serious effects additional flooding on the western side of the project alignment. Therefore, a 2-D numerical model for forecasting basin flood disasters was established and verified using historical flood data. The model was applied to researching the interaction between the proposed Project and flooding events for 5 streams in the Anyang River reach as a representative case study. Simulated results indicate that the model could correctly forecast the flood, submerged area and depths, and water surface elevations along the left side of the channel. The discharge capacity and location of hydraulic structures in the transfer canal alignment were analyzed. Then adjustments to the dimensions and positioning of proposed hydraulic structures were recommended at intersections, especially the addition of a channel to transfer flood water from one stream to another, which can effectively limit the sluice and protect the Anyang City from flooding.

关键词： South-to-North Water Transfer Project 2-D numerical simulation interpenetrating flood field diffiuent canal

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Automated Contour Detection for Intravascular Ultrasound Image Sequences Based on Fast Active Contour Algorithm

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Chinese Journal of Biomedical Engineering(English Edition) 2006年第1期15卷 16-25页

作者： dong hai-yan wang Hui-nan College of Automation Engineering Nanjing University of Aeronautics & Astronautics Nanjing 210016 China College of Automation EngineeringNanjing University of Aeronautics & Astronautics Nanjing 210016 China

Intravascular ultrasound can provide high-resolution real-time cross-sectional images about lumen, plaque and tissue. Traditionally, the luminal border and medial-adventitial border are traced manually. This process is extremely time-consuming and the subjective difference would be large. In this paper, a new automated contour detection method is introduced based on fast active contour model. Experimental results found that lumen and vessel area measurements after automated detection showed good agreement with manual tracings with high correlation coefficients (0.94 and 0.95, respectively) and small system difference (-0.32 and 0.56, respectively). So it can be a reliable and accurate diagnostic tool.

关键词： Intravascular ultrasound, Active contour, Contour detection, Luminal border, Medial-adventitial border

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EXPRESSION AND SWITCHING OF TH1/TH2 TYPE CYTOKINESGENE IN HUMAN GLIOMAS

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Chinese Medical Sciences Journal 2005年第4期20卷 268-272,页

作者： Gang Li Yong-sheng Hu Xin-gang Li Qing-lin Zhang dong-hai wang Song-feng Gong Department of Neurosurgery Qilu Hospital Shandong University Jinan 250012 Department of Neurosurgery Xuanwu Hospital Capital University of Medical Sciences Beijing 100053 Department of Neurosurgery the Second Hospital Shandong University Jinan 250033

Objective To study the expression and switching of Thl/Th2 cytokines gene in human gliomas and its effects on occurring and developing of human gliomas. Methods Interleukin（IL）-2 and interferon-3, represent Thl type cytokines. IL-4, IL-6, IL-10, and IL-13 represent Th2 type cytokines. The gene expressions of Th1/Th2 cytokines in human glioma cells, glioma infiltrating lymphocytes, and glioma cell lines were detected by reverse transcription polymerase chain reaction （RT-PCR）. The biological activity of cytokines in the supematant of glioma cell lines was assayed by enzyme-linked immunosorbent assay （ELISA） method. Results The total positive rates of Th1 and Th2 type cytokines gene in human glioma cells were 14.77% and 75%. The total positive rates of Th1 and Th2 type cytokines gene in glioma infiltrating lymphocytes were 22.73% and 68.17%. There was obviously predominant expression of Th2 type cytokines in human glioma tissues, glioma infiltrating lymphocytes, and glioma cell lines. There was no unbalanced expression of Th1/Th2 cytokines in normal brain tissues. Conclusion There is a predominant expression of Th2 type cytokines in human glioma cells. The switching of Th1/Th2 cytokines gene may play an important role in the occurring and developing of human gliomas.

关键词： glioma cytokine Th1/Th2 gene expression

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