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World Journal of Gastroenterology 2004年第10期10卷 1537-1539页

作者： ChaoZhang Zhan-KuiLiu Pei-wuyu DepartmentofGeneralSurgery SouthwestHospitalThirdMilitaryMedicalUniversityGaotanYanChongqing400038China

AIM: To investigate the effects of bile reflux and intragastric microflora changes on lesions of remnant gastric mucosa after gastric ***: Concenration of bile acid and total bacterial counts (TBC) in gastric juice were measured in 49 patients with peptic ulcer before and after gastrectomy. One year after the operation, sample of gastric mucosa taken from all the patients were used for histological ***: The concentration of gastric bile acid was significantly increased in group B-I, or B-II and SV+A than that in group HSV (P<0.05-0.01). The abnormal histological changes in the remnant gastric mucosa were more common in the first 2 groups than in the last ***: The type of gastrtectomy can affect bile reflux. The abnormal histological changes in the remnant gastric mucosa are closely related to the elevation of bile acid concentration and increase of TBC in gastric juice. HSV can effectively prevent bile reflux and keep the gastric physiological functions stable.

关键词：胆汁返流胃手术残胃粘膜胃内微生物组织病理学

Microstructure of a Ni Matrix Composite Coating Reinforced by In-situ TiC Particles Using Plasma Cladding

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材料热处理学报 2004年第05B期25卷 1041-1044页

作者： wuyu-ping WANGZe-hua LINPing-hua DepartmentofMaterialSciencesandEngineering HohaiUniversityNanjingChina DepartmentofMaterialSciencesandEngineering HohaiUniversityNanjingChina／／DepartmentofMaterialSciencesandEngineeringSoutheastUniversityNanjingChina

Plasma cladding process was used to prepare the TiC/Ni composite coating on the mild steel substrates. The TiC particles were synthesized in-situ. Microstructure and properties of the coating were investigated by optical microscopy, X-Ray diffraction, SEM, TEM and microhardness tester. The results show that the interface between the coating and the substrate is metallurgically bonded. The coating was uniform and almost defect-free when [Ti+C] varied from 10% to 20% after ball milling. The microstructure of the coating is mainly composed of -Ni dendrite, interdendritic eutectic ( -Ni austenite, M23C6 and CrB) and TiC particles. Most of the TiC particles are spherical and a small fraction is blocky in size of l^2(im. The TiC particles are smaller at the bottom than near the top of the coating. The coating has a gradient microstructure and a highest hardness of lOOOHyO. 1.

关键词：显微结构等离子包覆复合涂层 TiC颗粒

NUMERICAL SIMULATION OF LAMINAR SQUARE IMPINGING JET FLOWS

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Journal of Hydrodynamics 2005年第3期17卷 269-274页

作者： CHENQing-guang XUZhong wuyu-lin ZHANGYong-jian DepartmentofThermalEngineering TsinghuaUniversityBeijing100084China DepartmentofFluidEngineering Xi＇anJiaotongUniversityXi＇an710049China DepartmentofMechanicalandElectronicEngineering ShandongUniversityofScienceandTechnologyQingdao266510China

A theoretical study has been undertaken to determine the flow characteristics associated with a three-dimensional laminar impinging jet issuing from a square pipe nozzle. Interesting flow structures around the jet are detected. The numerical result reveals the existence of four streamwise velocity off-center peaks near the impingement plate, which is different from the rectangular jet impingement. The mechanism of the formation of the off-center velocity peaks and the parameters affecting the flow-field characteristics are discussed by comparison of the computed results with different nozzle-to-plate spacings and Reynolds numbers.

关键词： three-dimensional simulation laminar square impinging jet off-center velocity peaks

Effect of Addition of Polytetrafluoroethylene (PTFE) and Silicon Carbide (SiC) on Properties of Electroless Nickel Alloy Coatings

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材料热处理学报 2004年第05B期25卷 1102-1105页

作者： wuyu-cheng HUXiao-ye WANGWen.fang HUANGXin-min FacultyofMaterialsScienceandEngineering HefeiUniversityofTechnology230009HefeiP.R.China

Electroless nickel (copper)-phosphorus-silicon carbide (SiC)-polytetrafluoroethylene (PTFE) composite coatings were prepared by adding SiC and PTFE into electroless nickel (copper)-phosphorus alloy baths. The effects of addition of SiC and PTFE on depositing rate, microhardness, wear resistance and anti-friction of the resulted composite coatings were studied. The results indicated that electroless nickel (copper)-phosphorus alloy coatings were greatly improved in depositing rate, microhardness, wear resistance and antifriction by co-deposited proper amount of SiC and PTFE.

关键词：非电解淀积聚四氟乙烯碳化硅镍合金

A LATTICE BOLTZMANN SUBGRID MODEL FOR LID-DRIVEN CAVITY FLOW

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Journal of Hydrodynamics 2005年第3期17卷 289-294页

作者： YANGFan LIUShu-hong wuyu-lin TANGXue-lin DepartmentofThermalEngineering TsinghuaUniversityBeijing100084China DepartmentofHydraulicEngineering TsinghuaUniversityBeijing100084China

In recent years, the Lattice Boltzmann Method (LBM) has developed into an alternative and promising numerical scheme for simulating fluid flows and modeling physics in fluids. In order to propose LBM for high Reynolds number fluid flow applications, a subgrid turbulence model for LBM was introduced based on standard Smagorinsky subgrid model and Lattice Bhatnagar-Gross-Krook (LBGK) model. The subgrid LBGK model was subsequently used to simulate the two-dimensional driven cavity flow at high Reynolds numbers. The simulation results including distribution of stream lines, dimensionless velocities distribution, values of stream function, as well as location of vertex center, were compared with benchmark solutions, with satisfactory agreements.

关键词： Lattice Boltzmann Method (LBM) Lattice Bhatnagar-Gross-Krook (LBGK) model Smagorinsky subgrid model driven cavity flow

Planning and Design for Eco-Sustainable Farmland Consolidation

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Pedosphere 2005年第3期15卷 327-333页

作者： BAOHai-Jun wuyu-Zhe WUCi-Fang XUBao-Gen IinstituteofRealEstate ZhejiangUniversityofFinanceandEconomicsHangzhou310012（China） CollegeofEnvironmentalandResourceSciences ZhejiangUniversityHangzhou310029（China）

With a view of sustainable development, different kinds of farmland consolidation are reviewed. A planning and design mode for eco-sustainable farmland consolidation, which integrated the ecotypic board, the ecotypic tunnel, the ecotypic island, and the ecotypic boundary, is proposed. Then, an actual case of farmland consolidation, a project located in Yinzhou County, Zhejiang Province, is used to demonstrate the effective application procedures of the planning and design mode.

关键词： eco-sustainable ecotypic farmland consolidation planning and design

AN IMPROVED DYNAMIC SUBGRIDSCALE STRESS MODEL

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Journal of Hydrodynamics 2004年第3期16卷 276-282页

作者： TANGXue-ling QIANZhong-dong wuyu-lin LIUShu-hong YANGFan DepartmentofThermalEngineering TsinghuaUniversityBeijing100084China

According to modeling principle that a model must be more accurate ifincluding more flow information, and based on the Cauchy-Helmholtz theorem and the Smagorinskymodel, a second-order dynamic model with double dynamic coefficients was proposed by applyingdimension analyses. The Subgrid-Scale (SGS) stress is a function of both strain-rate tensor androtation-rate tensor. The SIMPLEC algorithm and staggering grid system was applied to give thesolution of the discretized governing equations, and for the turbulent flow through a 90° bend, thedistributions of velocity and pressure were achieved. The comparison between experimental data andsimulation results at a Reynolds- number 40000 shows a good agreement and implies that this model ispracticable and credible.

关键词： sub-grid-scale (SGS) model second-order dynamic model large eddy simulation( LES) turbulent flow curved duct

Effects of SiO_2 and TiO_2 on resistance stabilities of flexible indium-tin-oxide films prepared by ion assisted deposition

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Rare Metals 2009年第6期28卷 559-563页

作者： LI Yuqiong YU Zhinong WANG wuyu FAN Yuejiang DING Zhao XUE Wei School of Optoelectronics Beijing Institute ofTectmology Beijing 100081 China General Research Institute for Nonferrous Metals Beijing 100088 China

Inorganic buffer layers such as SiO2 or TiO2 and transparent conductive indium-tin-oxide （ITO） films were prepared on polyethylene terephthalate （PET） substrates by ion assisted deposition （IAD） at room temperature, and the effects of SiO2 and TiOzon the bending resistance performance of flexible ITO films were investigated. The results show that ITO films with SiO2 or TiO2 buffer layer have better resistance stabilities compared to ones without the buffer layer when the ITO films are inwards bent at a bending radius more than 1.2 cm and when the ITO films are outwards bent at a bending radius from 0.8 cm to 1.2 cm. 1TO films with SiO2 buffer layer have better resistance sta- bilities compared to ones with TiO2 buffer layer after the ITO fdms are bent several hundreds of cycles at the same bending radius, for the adhesion of SiO2 is stronger than that of TiO2. The compressive stress resulted from inward bending leads to the formation of more defects in the ITO films compared with the tensile stress arising from outward bending. SiO2 and TiO2 buffer layers can effectively improve the crystallinity of ITO films in （400）, （440） directions.

关键词： indium-tin-oxide (ITO) inorganic buffer layers bending resistance performance stress ion assisted deposition (IAD)

Towards in vivo photoacoustic human imaging:Shining a new light on clinical diagnostics

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Fundamental Research 2024年第5期4卷 1314-1330页

作者： Zhiyang Wang Fei Yang wuyu Zhang Kedi Xiong Sihua Yang MOE Key Laboratory of Laser Life Science&Institute of Laser Life Science College of BiophotonicsSchool of Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou 510631China Guangdong Provincial Key Laboratory of Laser Life Science College of BiophotonicsSchool of Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou 510631China

Multiscale visualization of human anatomical structures is revolutionizing clinical diagnosis and *** one of the most promising clinical diagnostic techniques,photoacoustic imaging(PAI),or optoacoustic imaging,bridges the spatial-resolution gap between pure optical and ultrasonic imaging techniques,by the modes of optical illumination and acoustic *** can non-invasively capture multiple optical contrasts from the endogenous agents such as oxygenated/deoxygenated hemoglobin,lipid and melanin or a variety of exogenous specific biomarkers to reveal anatomy,function,and molecular for biological tissues in vivo,showing significant potential in clinical *** 2001,the worldwide first clinical prototype of the photoacoustic system was used to screen breast cancer in vivo,which opened the prelude to photoacoustic clinical *** the past two decades,PAI has achieved monumental discoveries and applications in human *** towards preclinical/clinical applications includes breast,skin,lymphatics,bowel,thyroid,ovarian,prostate,and brain imaging,etc.,and there is no doubt that PAI is opening new avenues to realize early diagnosis and precise treatment of human *** this review,the breakthrough researches and key applications of photoacoustic human imaging in vivo are emphatically summarized,which demonstrates the technical superiorities and emerging applications of photoacoustic human imaging in clinical diagnostics,providing clinical translational orientations for the photoacoustic community and *** perspectives on potential improvements of photoacoustic human imaging are finally highlighted.

关键词： Photoacoustic imaging Clinical diagnostics Biomedical optics Human imaging Multiscale imaging

Spatial weight matrix in dimensionality reduction reconstruction for microelectromechanical system-based photoacoustic microscopy

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Visual Computing for Industry,Biomedicine,and Art 2020年第1期3卷 247-256页

作者： Yuanzheng Ma Chang Lu Kedi Xiong wuyu Zhang Sihua Yang MOE Key Laboratory of Laser Life Science&Institute of Laser Life Science College of BiophotonicsSouth China Normal UniversityGuangzhou 510631China Guangdong Provincial Key Laboratory of Laser Life Science College of BiophotonicsSouth China Normal UniversityGuangzhou 510631China

A micro-electromechanical system(MEMS)scanning mirror accelerates the raster scanning of optical-resolution photoacoustic microscopy(OR-PAM).However,the nonlinear tilt angular-voltage characteristic of a MEMS mirror introduces distortion into the maximum back-projection ***,the size of the airy disk,ultrasonic sensor properties,and thermal effects decrease the ***,in this study,we proposed a spatial weight matrix(SWM)with a dimensionality reduction for image *** three-layer SWM contains the invariable information of the system,which includes a spatial dependent distortion correction and 3D *** employed an ordinal-valued Markov random field and the Harris Stephen algorithm,as well as a modified delay-and-sum method during a time *** results from the experiments and a quantitative analysis demonstrate that images can be effectively reconstructed using an SWM;this is also true for severely distorted *** index of the mutual information between the reference images and registered images was 70.33 times higher than the initial index,on ***,the peak signal-to-noise ratio was increased by 17.08%after 3D *** accomplishment offers a practical approach to image reconstruction and a promising method to achieve a real-time distortion correction for MEMS-based OR-PAM.

关键词： Photoacoustic microscopy Spatial weight matrix Dimensionality reduction Distortion correction Mutual information