bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research of photon correlation technology
Authors: Zou Lianying , Gao Ning , Xiao Qian 
Published: January 2020

Abstract
Photon correlation technology is an important technology in the field of nanoparticle measurement at present. This paper expounds the research significance of photon correlation technology, introduces the research background and basic concepts of this technology, and studies and analyzes the research status of the correlation algorithm of the new photon correlator. Finally, prospect and application development trend of this technology are analyzed, from the aspects of practicability, application environment and hardware conditions, the difficulties faced by the photon correlation technology are put forward. There are some difficulties when the photon correlator needs to meet the requirements of accuracy, small sampling interval and large dynamic range, this article presents some possible solutions.
Design and Research of Ground Control System of the UAV-borne Photoelectric Platform
Authors: Zhao Xinglong , Zhao Jingshan , Zheng Xing , Cheng Jian , Bao Chuanmei , Zhang Zhengwu , Fu Xiaojin , Liu Yun 
Published: January 2020

Abstract
According to the working principle of a UAV-borne photoelectric platform, as well as the main functions and characteristics of the photoelectric platform ground control system, the overall design scheme and target of this system are proposed with an introduction of its composition and working principle. On this basis, the design and research of the system are carried out from hardware and software. Specific schemes of the two aspects are given. Finally, the future of the photoelectric platform ground control system is predicted on the trend of UAV-borne photoelectric platform.
Simulation Study on Laser Damage of Iron Plate
Authors: Wang Tianyu , Bian Jintian , Ye Qing , Li Xin , Sun Xiaoquan 
Published: January 2020

Abstract
Studying laser damage effects are of great significance in the field of industrial production. In order to evaluate the damage effect of laser on iron, the process of pulsed laser and continuous laser irradiate an iron plate was simulated by using COMSOL. The relationship between temperature and surface energy absorptivity of iron plate was discussed. The initial simulation parameters were set as follows: the pulsed laser wavelength is 1064nm, the pulse width is 10ns, the pulse energy is changed from 2mJ to 8mJ, and the average power of continuous laser is 225mW. The simulation results show that pulsed laser can rise the surface temperature of iron plate very quickly, and improve surface energy absorptivity of the plate. Thus using pulsed laser to radiate an iron plate before using continuous laser can improve damage efficiency of continuous laser on an iron plate.
Research on Temperature and Humidity Decoupling Control of Constant Temperature and Humidity Test Chamber
Authors: Wang Liheng , Zhu Zhifeng 
Published: January 2020

Abstract
The temperature and humidity system is a system commonly used in industry and is recognized as one of the most complex systems. Temperature and humidity are important parameters for improving production quality in industrial production. To carry out effective control, factors such as nonlinearity, large hysteresis and real-time change must be considered, and there is mutual coupling between temperature and humidity. Temperature change will lead to humidity. The change of humidity and the same change of temperature will also affect the temperature change. The positional PID control can achieve satisfactory results. In this paper, through the analysis of the temperature and humidity system model, the feedforward decoupling compensation method is adopted for the characteristics of the temperature and humidity control system, which provides an effective way for the modeling and control of the temperature and humidity system. The simulation results show that the feedforward decoupling controller designed in this paper can achieve satisfactory results under various experimental conditions.
Effects of Typical Emission Waveform on Laser Reflective Tomography Imaging
Authors: Zhang Xin-Yuan , Hu Yi-Hua , Zhao Nan-Xiang , Xu Shi-Long 
Published: January 2020

Abstract
Laser reflective tomography imaging is a new imaging method of long distance and high resolution. The echo could be expressed as the convolution of incident waveform and the reflectance projection distribution, so the deconvolution effect of the echo obtained by different emission waveforms is also different. In order to explore the reflectance projection distribution obtained by deconvolution of different emission waveforms under the same SNR, we simulated four kinds of emission pulses and from the comparison of the RMS of Euclidean distance between deconvolution results and reality results, we found that Gaussian pulse could be selected as the most suitable emission waveform when the SNR was less than 40, and when the SNR was larger, Sawtooth pulse was the best choice.
Numerical calculation and analysis of infrared radiation characteristics of stratospheric airship
Authors: Feng Yunsong , Lu Yuan , Jin Wei 
Published: January 2020

Abstract
In order to estimate the spatial distribution of infrared radiation of stratospheric airship, the geometric model of stratospheric airship was firstly constructed in this paper. Then, considering the influence of environmental radiation, the one-dimensional heat conduction differential equation of airship skin was established, the equation was solved by backward difference method, and the temperature distribution of airship skin was numerically calculated. On this basis, the spatial distribution of airship infrared radiation was further calculated. The results show that the infrared radiation intensity of the airship in the sunny face is higher than that in the shadow face, and the infrared radiation intensity of the airship in the 8~14μm is obviously higher than that in the 3-5μm.
Recycle of vanadium from aluminum slag of ferrovanadium
Authors: Chen Wei-Sheng , Liu Tzu-Yu , Lee Cheng-Han 
Published: January 2020

Abstract
Vanadium is a rare chemical element and it primarily comes from the by-product of other minerals. In this study, the material source mainly comes from vanadium-rich aluminum slag. This experiment aims to separate vanadium and other impurities, such as aluminum and zirconium. First, the slag was dissolved in the sodium hydroxide solution at pH value 13, and part of the alumina was precipitated. After removing the precipitation, the strong acid cation exchange resin, Dowex® G26, was added to eliminate the remaining impurities. In this procedure, the parameter of reaction time, the mass of ion exchange resin and pH value were supplied. Moreover, the adsorption isotherms described by means of the Langmuir and Freundlich isotherms were used to investigate the ion-exchange behaviors of vanadium. To sum up, this study will provide the best conditions of ion exchange to get high purity about 95% of vanadate.
Cobalt−Citrate Metal−Organic-Framework UTSA-16 on TiO2 Nanoparticles
Authors: Tseng Mei-Yi , Su Yen-Hsun , Lai Yi-Sheng , Pan Fei , Kung Po-Yen 
Published: January 2020

Abstract
Over the past few decades, the multifunctional material, metal-organic frameworks(MOFs), has been distinguished for their unique properties such as reticular structure, permanent porosities, high surface area, straightforwardly self-assembly and crystalline nature. On a count of these potentialities, the applications of MOFs can be classified into separation, catalysis, sensing, and biomedicine these four fields. In our studies, we will concentrate on the fields of gas storage and separations, water splitting, CO2 reduction, and White-light emission and so on.
Experimental Study on High Temperature Pyrolysis Characteristics of Biomass Tar in Biomass Gasification-reburning Technology
Authors: He Peng , Zhang Qian , Zhang Bing , Liu Jinhua , Gong Guohong , Li Dong 
Published: January 2020

Abstract
In order to solve the problem of high-tar content of gasification products in biomass gasification-reburning technology, this thesis proposes an experimental scheme for high temperature thermal cracking of biomass tar, using representative rice hull tar as a sample, and self-designed pyrolysis experiment. On the stage, the reaction temperature of the gasification chamber was measured by a high-temperature thermocouple. At the same time, the biomass tar cracking rate was measured at different temperatures with the thermobalance by appropriately changing pyrolysis temperature, and the Agilent HP5973 GC/MS was employed to analyze the components of pyrolysis products of biomass tar under different temperature conditions. The experimental results show that the total thermal cracking rate of tar increased with the increasing of experimental temperature. In the temperature range of 550°C∼655°C, the increasing rate of thermal cracking becomed slower; when it reached between 655°C and 790°C, the thermal-cracking rate showed a significant growth trend; while entering 790°C∼853°C, the growth rate slowed down. The experimental and analytical results reveal the basic laws of high-temperature pyrolysis of biomass tar, and provide a certain technical basis for the industrial production of low-tar and high-quality biomass gas.
Effects of Friction Speed on Microstructures and Mechanical Properties of Friction Welded Super304H Welding Joints
Authors: Yang Xu , Lu Yuan , Li Debiao , Bi Cheng , Zhang Jianlong , Sun Fuyang , Cao Bo 
Published: January 2020

Abstract
The Super304H austenitic steel were welding though friction welding technique. The Super304H joints showed excellent microstructure and mechanical properties. The effects for friction speed on the microstructure and mechanical properties of Super304H welding joints was investigated. With an increase in the friction speed, the grains didn’t grow up and second-phase particles precipitates increased in welding joints. The tensile fracture location was in the Super304H heat affected zone. When the friction speed was increased, the tensile strength increased and impact toughness was decreased.
Numerical investigations of the flow distributions with a transient three-dimensional multi-component ejector model
Authors: Liu Zhanrui , Jiao Kui , Yang Zirong , Du Qing 
Published: January 2020

AbstractEjector is a promising hydrogen recirculation for proton exchange membrane fuel cell (PEMFC) systems since it does not require parasitic power consumption. However, the complicated transport mechanisms inside the ejector remain unclear. In this study, the heat and mass transport processes are investigated by a transient three-dimensional multi-component model. The distribution of velocity, temperature, and pressure are presented. To avoid water vapor condensation, the maximum primary flow pressure should be limited to prevent the formation of a low temperature region at the nozzle throat. Compared with the converging-diverging nozzle, the convergent nozzle is recommended since it increases the condensation of water vapor. To predict the lowest temperature, the relationship between the relative pressure and the temperature is further obtained by curve fitting methods.
Efficiency Calculation and Economic Analysis of Straight Fins with Various Shapes Based on Steady-state Heat Conduction
Authors: Chen Jiying , Jiang Shenghao , Hu Jiayi , Ji Jiaxin 
Published: January 2020

Abstract
Fins are an important means of heat transfer enhancement, which can increase the heat transfer area, reduce the heat resistance of convection heat transfer and enhance the heat transfer capacity of equipment. The analytical solutions of rectangular fins, trapezoidal fins and triangular fins in one dimension are given by using the direct solution method. Then the heat conduction of fins is discretized by the finite volume method (FVM). By solving the discrete linear equations, the numerical solutions of temperature distribution on the surface of fins with constant property and variable property are obtained. Based on the law of temperature distribution, the relationship between the length, the height and the width of fins and fin efficiency is explored, and its economic efficiency is discussed. The results show that the temperature gradient of rectangular fins is the smallest, and that of triangular fins is the most significant. For various shapes of fins, the most effective way to increase heat dissipation is to increase the width of the fin, and for the fin whose machining length is 1 unit, the efficiency of the first 20%∼30% part of the maximum length changes significantly, which can be used as the focus of cost optimization.
Slagging resistance mechanism of precursor ceramic coating for solid fuel-fired boilers
Authors: Wang Guangxin , Zhang Bing , Wang Jinqing , Chi Zuohe , Zhang Guangxue , li Jin , Wang Jie , Qian Peihao , Yang Songjie 
Published: January 2020

Abstract
Slag formation on the heating surface in solid fuel-fired boilers is a common problem. In this paper, with polysilazane used as the precursor, three different ceramic coatings were prepared by adding hexagonal boron nitride (h-BN), ZrO2, and Al2O3 inert fillers. The coatings were applied to a TP347 substrate by the Czochralski method. The spreading and solidification experiments of the molten ash were performed and matched with numerical simulation. The results show that compared with the steel sheet, the molten ash has a large contact angle on the coating, a small spreading coefficient and the same spreading time, indicating that the coating has the slagging resistance property. The coating with the addition of h-BN has better slagging resistance properties than the other two coatings. The numerical simulation results are consistent with the experimental results.
Fracture Analysis on Turbine Intermediate Regulating Valve of an Electric Generator Unit
Authors: Wang Tianpeng , Sui Yuqiu , Wang Yunan , Li Hongqiang , Sun Mingcheng , Dai Li , Wu Nan 
Published: January 2020

Abstract
A turbine intermediate regulating valve fractured in a power plant, and the reasons for the fracture were analysed by using macro morphology observation, mechanical properties test, chemical composition analysis and microstructure observation, such as scanning electron microscopy (SEM) analysis or metallographic analysis. The results indicated that the chemical composition and strength properties were in accordance with the standard requirements, but the elongation after fracture and the impact toughness value were all lower than the required values. Precipitation of σ phase further weakened the matrix and reduced the strength of the structure. Fretting friction and collision appeared between the valve stem and the anti-rotating pin, and additional stress was generated by the reduction of radial clearance between the pin and valve. Then cracks and brittle expansion occurred in the stress concentration areas close to the anti-rotating pin holes and finally fractured.
Application of BP neural network based on genetic algorithm optimization in thermal conductivity of nanofluids
Authors: Wang Jiang , Zhai Yuling 
Published: January 2020

Abstract
In this paper, a hybrid model (BP-GA) including a back propagation network and a genetic algorithm is used to estimate the thermal conductivity of the nanofluids. The genetic algorithm is used to optimize the initial weight and threshold of BP neural network, so that the optimized BP neural network can better predict the function output. In this study, CuO-ZnO hybrid nanofluids with the mass fraction of 0%, 1%, 2%, and 3% were studied at temperatures of 25, 30, 35, 40, 45, 50, 55, and 60 °C, respectively. The thermal conductivity of the hybrid nanofluids base liquid is 20:80, 40:60, 50:50, 60:40, 80:20, and the mass ratio of CuO-ZnO is 50:50. The mass fraction of CuO-ZnO, the temperature and the mixing ratio of different base liquids were used as input parameters, and the thermal conductivity was the output parameter, forming a 3-input ANN neural network. The predicted thermal conductivity results of BP neural network and genetic algorithm optimized BP neural network (GA-BP) were compared with experimental data. The results illustrate that the BP neural network optimized by genetic algorithm exerts a positive influence on the accuracy and stability of the predicted output.
Thermal stress analysis of printed circuit heat exchanger based on thermal-structural coupling method
Authors: Wu Jun , Yao Shuo , Zhao Zhenxing , Xiao Qi , Ke Zhiwu , Lin Yuansheng 
Published: January 2020

Abstract
The supercritical carbon dioxide (S-CO2) Brayton cycle has the advantages of high efficiency, compactness and simplicity. It is expected to become the main technical route for the future advanced ship nuclear power platform. The printed circuit heat exchanger (PCHE) with ultra-high pressure, ultra-compact and ultra-high efficiency typical characteristics is the ideal configuration of the S-CO2 power generation system recuperator. The PCHE numerical analysis model is constructed and the thermal stress field of the PCHE core structure is analyzed by thermal-structural coupling method. The results show that the maximum thermal stress of the PCHE core structure is 117 MPa, which is less than the yield limit of the material and meets the requirement of strength safety. The thermal stress value of most regions in PCHE is less than 78.2MPa. Therefore, the current design scheme has a large safety margin. The PCHE compactness can be further improved by structural parameter optimization.
A practical calibration method of the room type calorimeter for testing the energy efficiency of room air conditioner
Authors: Zhang Haiyun , Hang Chenzhe , Zhongjie Wu , Xu Dinghua 
Published: January 2020

Abstract
The room type calorimeter is generally used as the energy efficiency measurement standard equipment in the air conditioner industry. However, the calibration procedure is not investigated. In this study, based on the empty-load situation of calorimeter, the calibration model is proposed in order to restrain the error of heat balance caused by long-term use. Besides, two new parameters, which are background value of indoor-side and outdoor-side, are presented in accordance with the calibration model. Experiments are designed to obtain these two parameters and three heat leakage coefficients of partition wall, as well as the calibration procedure and application method of the parameters are illustrated. The corrected calorimeter measures ten different window type air conditioners in one year. The results show that the absolute value of heat balance is less than 2% in the cooling capacity range of 2000W∼4500W and 1% in the range of 4500W∼7000W.
Numerical Simulation of Oxy-Fuel Combustion of Predrying Lignite
Authors: Wang Guanyu , Li Xianchun , Zeng Yongjian , Meng Fanrui , Wang Huanran 
Published: January 2020

Abstract
In this paper, the combustion characteristics of lignite with different levels of predrying and the influence of different oxy-fuel concentration on the combustion characteristics of pulverized coal are studied with CFD software. The results show that with the increase of lignite moisture content, the temperature level in the burner decreases gradually, which affects the ignition of pulverized coal and the thermal efficiency of the furnace, and the amount of NO and intermediate products in the furnace also decreases. The flame distance of pulverized coal in oxy-fuel combustion is shortened and the combustion rate is accelerated. The ignition temperature and the production of NO and SO2 are reduced, and the concentration of CO2 can reach more than 90%. The local high temperature will appear in oxy-fuel combustion, and it will increase as the oxygen concentration increases, and the temperature of surrounding flue gas will become more uniform.
Numerical simulation research of influencing factors of fin temperature in finned tube heat exchanger
Authors: Yu Zhiqiang , Chen Yongdong , Wu Xiaohong , Wang Yandong , Cheng Pei , Yu Gaige 
Published: January 2020

Abstract
In the using process of the finned tube, the temperature on the top of the windward face of the fin in the first and second row of finned tube is the highest temperature of finned tube. It restricts and determines the high temperature conditions and application fields of finned tube heat exchanger. This paper establishes the research model of the first row and second row finned tube, to carry out the numerical simulation calculation of the fluid flow and heat transfer of high temperature air flowing through the finned tube and exchanging heat with cooled liquid water, and to research the influence of different tube transverse spacing, fin spacing and other factors on the fluid flow and heat transfer characteristics of finned tube and the highest fin temperature. The air outlet temperature, heat exchange capacity, Nu number, pressure drop and maximum fin temperature are obtained in the conditions of different tube transverse spacing and fin spacing, and the variation characteristic, mechanism and law of temperature field and velocity vector for the finned tube are also gained.
Economic Benefit Evaluation of Waste Heat Recovery in Coal-fired CHP System Based on Exergoeconomic Analysis
Authors: Yu Zaihai , Gao Jintong 
Published: January 2020

Abstract
As one of the main energy-saving measures and an important part of the power industry, CHP (combined heat and power) has achieved rapid development in recent years, which have the advantages of low heat loss, flexible operation mode, and cascade utilization of energy compared with heating boilers and traditional power plants. However, there is a lack of reasonable evaluation of CHP systems, due to the difference in energy quality of heat and electricity. It is urgent to establish considerable and reasonable evaluation indexes of CHP systems. In addition, in the actual operation of CHP plant, a large amount of waste heat is released into the environment, and there is still room for further improvement in the waste heat utilization. In this paper, an exergoeconomic analysis model of CHP system with circulating fluidized bed boiler is established, and the economic benefits of waste heat recovery in CHP systems are studied. After the application of waste heat recovery, the system exergy efficiency increased from 32.94% to 34.14%. The unit exergoeconomic cost of electricity and process steam did not change much, but the unit exergoeconomic cost of heating decreased by 17.1%, which indicates the economic benefits of waste heat recovery.
Failure Analysis of SA-213TP347H High-temperature Reheater of 600 MW Supercritical Boiler
Authors: Wang Jia’an , He Jun 
Published: January 2020

Abstract
Failure analysis of SA-213TP347H steel tube for high-temperature reheater of 600MW supercritical boiler was studied by means of macroscopic analysis, chemical composition, mechanical properties, microstructure, scanning electron microscopy and energy spectrum analysis. The results show that the chemical composition, hardness and strength of the tube samples meet the limit of ASTM A213/A213M standard. The microstructure of tube-burst sample is austenite, there are some precipitates containing Cr and Nb element at the grain boundaries. The test results for the spare part sample near elbow show that the hardness exceeds the limit of SA-213TP347H steel, there are a lot of slip lines and some non-metallic inclusions containing S in the microstructure. It is concluded that solid solution treatment missing in its manufacturing is the main reasons for the fracture, which makes Cr precipitate on the grain boundary and form the Cr-depleted zone, which is easy to cause intergranular stress corrosion and lead to the tube burst.