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Fertiles tierras para el intercambio

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今日中国（西文版） 2024年第1期 18-20页

作者： LUO ZHlZHl y gao LEl

Microstructure of Laser Remelted Ni-base Alloy Coating on Stainless Steel

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Journal of Materials Science & Technology 1998年第1期14卷 49-52页

作者： gao, y Liang, y Shi, CX Inst Aeronaut Mat Beijing 100095 Peoples R China Chinese Acad Sci Inst Met Res Shenyang 110015 Peoples R China

A 5 kW CW CO2 gas laser was used to produce NiCrBSi superalloy coatings. Powders were preplaced by plasma-spraying. The microstructure and chemical composition of the coating have been studied by SEM, XRD and HREM. The results show the coating microstructure is fine dendrites, composed of gamma matrix, gamma' and boride (NiB) eutectic, the lattice parameter of the gamma matrix is 0.3572 nm and there is a metallurgical bonding in interface.

关键词： Stainless steel

Numerical studies on swirling of internal fire whirls with experimental justifications

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Building Simulation 2021年第5期14卷 1499-1509页

作者： Zheming gao S.S.Li y.gao H.y.Hung Wan-ki Chow Midea Residential Air Conditioner Division FoshanGuangdongChina College of Aerospace and Civil Engineering Harbin Engineering UniversityHarbinHeilongjiangChina Department of Building Services Engineering The Hong Kong Polytechnic UniversityHunghomKowloonHong KongChina

Numerical studies on internal fire whirls(IFW)generated in a vertical shaft model with a single corner gap were reported in this *** generation of IFW,burning rate of fuel and temperature were studied experimentally *** simulations on medium-scale IFW were carried out using a fully-coupled large eddy simulation incorporating subgrid scale turbulence and a fire source with heat release rates compiled from experimental *** transient flame shape was studied and then simulated numerically by using *** dynamic phenomena of generation and development of IFW were simulated and then compared with experimental *** predicted results were validated by comparing with experimental data,which demonstrated that an IFW can be simulated by Computational Fluid *** results for flame surface,temperature,and flame length agreed well with the experimental *** IFW flame region and intermittent region were longer than those for an ordinary pool *** modified empirical formula for centerline temperature was *** of vertical and tangential velocity in axial and radial directions were also *** vortex core radius was found to be determined by the fuel bed *** field was not measured extensively due to resources *** measured temperature distribution with predictions is acceptable because temperature is related to the heat release rate,air flow and pressure gradient.

关键词： internal fire whirl large eddy simulation vertical structure flame surface

Primary porcine hepatocytes with portal vein serum cultured on microcarriers or in spheroidal aggregates

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World Journal of Gastroenterology 2000年第3期6卷 365-370页

作者： gao y Hu HZ Chen K yang JZ First Mil Med Univ Zhujiang Hosp Dept Hepatobiliary Surg Guangzhou 510282 Guangdong Provi Peoples R China

AIM To develop a culture mode providingdurable biomaterials with high yields andactivities used in bioartificial *** Hepatocytes were isolated from awhole pig liver by Seglen’s method of orthotopicperfusion with *** culture onmicrocarriers,primary porcine hepatocyteswere inoculated at a concentration of 5×10~7/mLinto the static culture systems containing 2 g/LCytodex-3,then supplemented with 100 mL/Lfetal calf serum(FCS)or 100 mL/L porcineportal vein serum(PPVS)*** aggregate culture hepatocytes wereinoculated into 100 mL siliconized flasks at aconcentration of 5.0×10~6/*** In culture on microcarriershepatocytes tended to aggregate on Cytodex-3obviously after being *** multi-cellular aggregated spheroids could be found inthe two systems 24 h-48 h after hepatocyteswere *** morphological charact-eristics and synthetic functions were maintainedfor 5 wk in FCS culture system and 8 wk in PPVSculture *** spheroidal aggregate cultureabout 80%-90% isolated hepatocytes becameaggregated spheroids 24h after cultured insuspension and mean diameter of the spheroidswas 100μ*** relationship among thehepatocytes resembled that in the liver in *** functions of albumin and urea of the spheroids were twice those of hepatocytescultured on *** As high-yields and high-activitymodes of culture on microcarriers or inspheroidal aggregate culture with portal veinserum are promising to provide biomaterials forbioartificial liver(BAL)efficiently.

关键词： porcine hepatocytes microcarriers cell culture spheroidal aggregate culture portal vein serum

Continuous-Variable Quantum Computation in Circuit QED

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Chinese Physics Letters 2023年第11期40卷 14-17页

作者： Xiaozhou Pan Pengtao Song yvonne y.gao Centre for Quantum Technologies National University of SingaporeSingapore Department of Physics National University of SingaporeSingapore

Quantum computation (QC) offers the promise of enhanced computational capabilities and drastic accelerations in solving complex tasks such as quantum chemistry^([1,2])and prime factorization.^([3])Various physical implementations for practical QC are being pursued across the academic and industrial research *** ones include trapped ions,^([4])nuclear spin,^([5]).

关键词： acceleration quantum Quantum

Cultivation of human liver cell lines with microcarriers acting as biological materials of bioartificial liver

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World Journal of Gastroenterology 1999年第3期5卷 221-224页

作者： gao y Xu XP Hu HZ yang JZ Mil Med Univ 1st Dept Gen Surg Zhujiang Hosp Guangzhou 510282 Guangdong Prov Peoples R China

AIM To improve the Cultivation efficiency and yield of human liver cell line *** High--density cultivation of CL--l onmicrocarriers was carried out with periodicobservation of their growth and *** specific functions of human liver cell werealso *** Cells of CL-1 cell line grew well onmicrocarrier Cytodex--3 and on the 7th day thepeak was reached. The amount of CLI cells was2.13 x 10’ and the total amount of albuminsynthesis reached 71 .23 ig, urea synthesis23 .32 mg and diazepam transformation 619 .7 ugrespectively. The yield of CL-l on microcarrierswas 49.3 times that of conventional *** amounts of albumin synthesis, ureasynthesis and diazepam transformation were39.8 times, 41 .6 times and 33.3 times those ofconventional Cultivation, *** The human liver cell line CL--1 canbe Cultivated to a high density with Cytodex--3and has better biological functions. High-densityCultivation of CLI on microcarriers can act asthe biological material of bioartificial liver.

关键词： cell Figure

Finite element simulations on the mechanical properties of MHS materials

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Acta Mechanica Sinica 2007年第1期23卷 65-75页

作者： Z. y. gao T. X. yu D. Karagiozova Department of Mechanical Engineering Hong Kong University of Science &Technology Clear Water Bay Kowloon Hong Kong China Institute of Mechanics Bulgarian Academy of Sciences Acad. G. Bonchev Street Block 4 Sofia 1113 Bulgaria

Finite element simulations are carried out to examine the mechanical behavior of the metallic hollow sphere （MHS） material during their large plastic deformation and to estimate the energy absorbing capacity of these materials under uniaxial compression. A simplified model is proposed from experimental observations to describe the connection between the neighboring spheres, which greatly improves the computation efficiency. The effects of the governing physical and geometrical parameters are evaluated; whilst a special attention is paid to the plateau stress, which is directly related to the energy absorbing capacity. Finally, the empirical functions of the relative material density are proposed for the elastic modulus, yield strength and plateau stress for FCC packing arrangement of hollow spheres, showing a good agreement with the experimental results obtained in our previous study.

关键词： Cellular material Hollow sphere Large plastic deformation Numerical simulation FEM

The improvement of an object-oriented classification using multi-temporal MODIS EVI satellite data

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International Journal of Digital Earth 2009年第3期2卷 219-236页

作者： y.gao J.-F.Mas A.Navarrete Centro de Investigaciones en Ecosistemas-Universidad Nacional Autonoma de Mexico(UNAM) Antigua Carretera a Pa tzcuaro No.8701Col.Ex Hacienda de San Jose de la Huerta C.P.58190 MoreliaMichoacanMexico Centro de Investigaciones en Geografıa Ambiental-Universidad Nacional Autonoma de Mexico(UNAM) Antigua Carretera a Pa tzcuaro No.8701Col.Ex Hacienda de San Jose de la Huerta C.P.58190 MoreliaMichoacanMexico

This paper investigates the contribution of multi-temporal enhanced vegetation index(EVI)data to the improvement of object-based classification accuracy using multi-spectral moderate resolution imaging spectral-radiometer(MODIS)*** object-oriented classification,similar pixels are firstly grouped together and then classified;the produced result does not suffer the speckled appearance and closer to human *** data are from the MODIS sensor aboard Terra spacecraft.69 EVI data(scenes)were collected during the period of three years(20012003)in a mountainous vegetated *** data sets were used to study the phenology of the land cover *** land cover types show distinct fluctuations over time in EVI values and this information might be used to improve object-oriented land cover *** experiments were carried out:one was only with single date MODIS multispectral data,and the other one including also the 69 EVI *** classes were distinguished:temperate forest,tropical dry forest,grassland,irrigated agriculture,rain-fed agriculture,orchards,lava flows and human *** two classifications were evaluated with independent verification data,and the results showed that with multitemporal EVI data,the classification accuracy was improved 5.2%.Evaluated by McNemar’s test,this improved was significant,with significance level p=0.01.

关键词： enhanced vegetation index(EVI) moderate resolution imaging spectral-radiometer(MODIS) phenology object-based image classification

A NEURAL NETWORK FOR WELD PENETRATION CONTROL IN GAS TUNGSTEN ARC WELDING

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Acta Metallurgica Sinica(English Letters) 2006年第1期19卷 27-33页

作者： C.S. Wu J. Q. gao y.H. Zhao Institute of Materials Joining Shandong University Jinan 250061 China

Realizing of weld penetration control in gas tungsten arc welding requires establishment of a model describing the relationship between the front-side geometrical parameters of weld pool and the back-side weld width with sufficient accuracy. A neural network model is developed to attain this aim. Welding experiments are conducted to obtain the training data set （including 973 groups of geometrical parameters of the weld pool and back-side weld width） and the verifying data set （108 groups）. Two data sets are used for training and verifying the neural network, respectively. The testing results show that the model has sufficient accuracy and can meet the requirements of weld penetration control.

关键词： neural network weld penetration control back-side weld width,gas tungsten arc welding