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Properties of Resistivity, Reflection and Absorption Related to Structure of ITO Films

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Journal of Materials Science & Technology 2012年第4期28卷 325-328页

作者： Yipeng Chao Wu Tang xuehui wang State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technologyof ChinaChengdu 610054China

Indium tin oxide （ITO） films were fabricated on polyethylene terephthalate （PET） substrate at room temperature using dc magnetron sputtering technique with different sputtering powers. The structural, electrical and optical properties were investigated by X-ray diffraction （XRD）, Hall effect, reflection and transmission, respectively. XRD patterns show gradual enhancement of crystalline quality with increasing sputtering power. Significant improvement of Hall mobility due to the reduction of defects was observed though the carrier density varied slightly. Simultaneously, the mean transmission in visible light range decreased severely with increasing sputtering power. Slight move toward shorter-wavelength side of absorption peak was due to the variation of plasma wavelength. The reflection increase of near-infrared light originated from the decrease of resistivity. Finally, band gap was obtained using Tauc＇s relation and it was consistent with Burstein-Moss shift.

关键词： Crystalline quality Hall mobility Absorption

Evaluation on Excess Entropy Scaling Method Predicting Thermal Transport Properties of Liquid HFC/HFO Refrigerants

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Journal of Thermal Science 2022年第5期31卷 1465-1475页

作者： wang xuehui WRIGHT Edward GAO Neng LI Ying Fluids and Thermal Engineering Research Group Faculty of EngineeringUniversity of NottinghamNottinghamNG72RDUK Ningbo Institute of Technology Zhejiang UniversityNingbo315100China Research Centre for Fluids and Thermal Engineering University of Nottingham Ningbo ChinaNingbo315100China

The application of the excess entropy scaling(EES)method to predict the viscosity,thermal conductivity and thermal diffusivity of HFC/HFO refrigerants is evaluated in this *** universal coefficients of the EES model were firstly obtained from the properties of HFC refrigerants,and the accuracy of the model was further investigated with HFO *** was suggested that the EES model correlated the viscosity very well with the average absolute deviations(AADs)of most HFC refrigerants lower than 6.55%except *** correlations also provided very good prediction on the viscosity for R1234yf and R1234ze(E),but not for R1336mzz(Z).The prediction of thermal conductivity for both HFC and HFO refrigerants was generally well with the maximum AAD of 11.44%.However,the paper also indicated that there were no universal thermal diffusivity coefficients for even HFC refrigerants,and the linear function could not fit the thermal diffusivity curve very ***,the exclusively two-order polynomial correlations based on the EES model were presented for each HFC/HFO refrigerant.

关键词： excess entropy scaling HFO HFC transport properties refrigerants

Prediction of Thermal Conductivity of Various Nanofluids with Ethylene Glycol using Artificial Neural Network

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Journal of Thermal Science 2020年第6期29卷 1504-1512页

作者： wang xuehui YAN Xiaona GAO Neng CHEN Guangming Fluids and Thermal Engineering Research Group Faculty of EngineeringUniversity of NottinghamNG72RDUK School of Landscape Architecture Zhejiang A&F UniversityHangzhou 311300China Ningbo Institute of Technology Zhejiang UniversityNingbo 315100China

The nanofluid has been widely used in many heat transfer areas due to its significant enhancement effect on the thermal ***,the methods that can accurately predict their thermal conductivities are very important to evaluate and analyze the heat transfer *** this paper,a novel artificial neural network(ANN)model was proposed to predict the thermal conductivity of nanofluids with ethylene glycol and could be used in a wide range with excellent accuracy.A total of 391 experimental data with a wide range of temperatures(4℃ to 90℃),nanoparticles(metal,metal oxide,etc.),volume concentrations(0.05%to 10%),and particle sizes(2 nm to 282 nm)were *** build the ANN model,the temperature,thermal conductivities of the base fluid and nanoparticles,the size and volume concentration of the nanoparticles were selected and used as the input *** were 5 nodes,10 nodes and 1 node in input layer,hidden layer and output layer,*** predicted results of the ANN model coincided with the experimental data very well with the correlation coefficient and mean square error(MSE)were 0.9863 and 3.01×10–5,*** relative deviations of 99.74%data were within±5%.The model was expected to be a good practical method to predict the thermal conductivity of nanofluids with ethylene glycol.

关键词： thermal conductivity nanofluids ANN model heat transfer

The Electrical Characterization and NIR Absorption of ITO Film under Different Sputtering Time

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稀有金属材料与工程 2012年第S1期41卷 306-308页

作者： Chao Yipeng Tang Wu wang xuehui Univ Elect Sci & Technol China State Key Lab Elect Thin Films & Integrated Devic Chengdu 610054 Peoples R China

Indium-tin-oxide(ITO)films with different sputtering time have been prepared by dc magnetron sputtering method on PET substrate at room *** film structure,thickness,electrical and optical properties are investigated through XRD,SEM,van der Pauw method and FTIR,*** XRD results indicate that all the films are amorphous *** the increase of sputtering time,resistivity and transmittance decrease *** the absorption gets stronger,especially in near-infrared light *** Drude model the plasma frequency is calculated and the calculation result is pretty consistent with films deposited at 60 and 90 min.

关键词： ITO films Drude model near-infrared absorption

Prospect Evaluation of Low-GWP Refrigerants R1233zd(E)and R1336mzz(Z)Used in Solar-Driven Ejector-Vapor Compression Hybrid Refrigeration System

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Journal of Thermal Science 2021年第5期30卷 1572-1580页

作者： wang xuehui YAN Yuying WRIGHT Edward HAO Xinyue GAO Neng Fluids and Thermal Engineering Research Group Faculty of EngineeringUniversity of NottinghamNottinghamNG72RDUK Ningbo Institute of Technology Zhejiang UniversityNingbo315100China Research Centre for Fluids and Thermal Engineering University of Nottingham Ningbo ChinaNingbo315100China

In this paper,the entrainment ratio,pump work,heat loads of heat exchangers and COPthermal were theoretically evaluated for a solar-driven ejector-vapor compression hybrid refrigeration system with R1233zd(E)and R1336mzz(Z)as the working *** evaluation of the utilization potentials of R1233zd(E)and R1336mzz(Z)was presented by comparing the system performance with that of R245fa,a commonly used refrigerant in the ejector *** results indicated that the systems with R1233zd(E)and R1336mzz(Z)had a higher entrainment ratio and lower pump *** pump works when using R1233zd(E)and R1336mzz(Z)can be up to 14.59%and 38.05%lower than those of R245fa,***,the system showed the highest COPthermal utilizing R1233zd(E)followed by that of R245fa,with the R1336mzz(Z)system having the lowest *** differences between R1233zd(E)and R1336mzz(Z)systems,R1233zd(E)and R245fa systems were 4.33%and 2.0%,*** paper was expected to provide a good reference for the utilizing prospect of R1233zd(E)and R1336mzz(Z)in ejector refrigeration systems.

关键词： low GWP alternative refrigerants ejector R1233zd(E) R1336mzz(Z)

Evaporating Temperature Uniformity of the Pulsating Heat Pipe with Surfactant Solutions at Different Concentrations

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Journal of Thermal Science 2023年第1期32卷 183-191页

作者： BAO Kangli wang xuehui ZHANG Peng-E HAN Xiaohong TAN Jianming State Key Laboratory of Air-Conditioning Equipment and System Energy Conservation GREE Electric Appliances Inc.of ZhuhaiZhuhai 519070China Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province Institute of Refrigeration and CryogenicsZhejiang UniversityHangzhou 310027China

The evaporating section of the pulsating heat pipe(PHP)is in direct contact with the electronics when it is used for heat dissipation,and thus the evaporating temperature uniformity has an important effect on the safe and reliable operation of electronic *** the basis of these conditions,an experimental study on the evaporating temperature uniformity of the PHP with surfactant solutions at different concentrations was conducted at the heat fluxes of(1911–19427)W/m^(2).Sodium stearate was utilized for the solute;the surfactant solutions were prepared with the concentrations of 0.001 wt%,0.002 wt%,and 0.004 wt%,respectively,and the filling ratios of the PHP were 0.31,0.44 and 0.57,*** experimental results revealed that under all tested working conditions,the highest temperature always appeared in the intermediate zone of the evaporating *** the heat flux increased,the temperature differences among different zones rose initially and then reduced due to the change of the flow motion and the flow *** evaporating temperature uniformity of the sodium stearate solutions-PHP was better than that of the deionized water-PHP,which suggested that the evaporating temperature uniformity might be improved through decreasing the surface ***,combined with the effect of surface tension and viscosity,for different filling ratios,the required concentration was different when the best evaporating temperature uniformity was *** be specific,when the filling ratio were 0.31 and 0.44,the best evaporating temperature uniformity was achieved at the concentration of 0.004 wt%,while at the filling ratio of 0.57,the best evaporating temperature uniformity was attained at the concentration of 0.002 wt%.

关键词： pulsating heat pipe surface tension evaporating temperature uniformity heat transfer

Experimental Investigation of the Ejector Refrigeration Cycle for Cascade System Application

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Journal of Thermal Science 2022年第5期31卷 1476-1486页

作者： HAO Xinyue GAO Neng CHEN Guangming VOLOVYK Oleksii wang xuehui XUAN Yongmei Institute of Refrigeration and Cryogenics Zhejiang UniversityHangzhou310027China Ningbo Institute of Technology Zhejiang UniversityNingbo315100China Fluids and Thermal Engineering Research Group Faculty of EngineeringUniversity of NottinghamNottinghamNG72RDUK

Ejector refrigeration cycle(ERC)with advantages of simple structure and low cost holds great application potential in cascade/hybrid cycles to improve the overall system performance by removing or recovering the heat from the main *** this paper,a theoretical and experimental investigation of the ERC as a part of a cascade system was carried *** operating parameters were *** experimental ERC test rig was designed,developed and investigated at high evaporating temperatures and wide ranges of operating *** influence of operating conditions on the efficiency of the ejector and ERC was *** results and analysis in this study can be helpful for the application and operating condition optimization of ERC in cascade/hybrid refrigeration systems.

关键词： ejector ejector refrigeration cycle cascade refrigeration system experiment performance

Experimental Investigation on the Temperature Distribution Characteristics of the Evaporation Section in a Pulsating Heat Pipe

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Journal of Thermal Science 2019年第2期28卷 246-251页

作者： wang xuehui GAO Xu BAO Kangli HUA Chao HAN Xiaohong CHEN Guangming State Key Laboratory of Technologies in Space Cryogenic Propellants Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province Institute of Refrigeration and Cryogenics Zhejiang University

With the increasing demand for heat dissipation in the electronics industry, pulsating heat pipe(PHP) has attracted wide attention due to its simple structure and excellent heat transfer ability. However, due to the unique operational mechanism of PHP, the temperature distribution in the evaporation section is obviously not even during the operational process of PHP. When the PHP is used as a heat dissipater, the evaporation section of the PHP directly contacts with the chips and has great influence on the performance of the chips, so it is very important to investigate the temperature distribution characteristics in the evaporation section. In this paper, both the effects of the filling ratio and heat flux on these characteristics were investigated. The experimental results indicated that the temperatures of the middle "U" turn were the highest. When the heat flux and the filling ratio were 364 W/cm^2 and 36.3%, respectively, the maximum temperature difference between the middle "U" turn and the other "U" turns could be as high as 18.92 K. Furthermore, the temperature differences between the middle "U" turn and the other "U" turns firstly increased and then decreased with the increase of heat flux and filling ratio.

关键词： temperature distribution pulsating heat pipe oscillation motions heat transfer

The complete mitochondrial genome of the grey bamboo shark (Chiloscyllium griseum) (Orectolobiformes: Hemiscylliidae): genomic characterization and phylogenetic application

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Acta Oceanologica Sinica 2013年第4期32卷 59-65页

作者： CHEN Xiao AI Weiming YE Le wang xuehui LIN Chongwen YANG Shengyun College of Fisheries Ocean University of China Zhejiang Key Laboratory of Exploitation and Preservation of Coastal Bio-Resource Zhejiang Mariculture Research Institute Department of Marine Science School of Life Science Wenzhou Medical College South China Sea Fisheries Research Institute Chinese Academy of Fishery Sciences Laboratory of Marine Biodiversity and Global Change College of Ocean and Earth Sciences Xiamen University

The complete mitochondrial genome of the grey bamboo shark, Chiloscyllium griseum （Orectolobiformes： HemiscyUiidae） was obtained, with a total of 16 755 base pairs （bp）. The mitogenome encoded 13 protein- coding genes, two ribosomal RNAs, 22 transfer RNAs and a noncoding control region, a gene arrangement identical to the most common type found in vertebrates. All tRNA sequences were folded into typical clover- leaf secondary structure with the exception of tRNA-Ser2, in which the DHU arm stem was replaced with 12 unpaired nucleotides and formed a simple loop. In the control region, the putative termination-associated sequences （TAS） with hairpin-loop structure and the conserved sequence blocks （CSB） I-III were identified and considered to be associated with the replication and transcription of mtDNA. No repeat motifs were found in the mitogenome of C. griseum. On the basis of the mitogenomic data available in the Class Chon- drichthyes from both Genbank and this study, and the phylogenetic analyses using maximum likelihood （ML） and Bayesian inference （BI） methods, the results strongly support the basal division between batoids and sharks and the monophyly of the Superorder Galeomorphii, and confirm the phylogenetic position of C. griseum in the Subclass Elasmobranchii. This study suggests that the mitogenomic data are more robust for reconstructing phylogenetic relationships than individual genes in the Elasmobranchii.

关键词： mitochondrial genome Chiloscyllium griseum Chondrichthyes phylogeny carpet shark,Galeomorphii