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Rapid Synthesis of W–Cr Solid–Solution by Dielectric-Barrier Discharge-Plasma-Assisted Ball Milling
S. F. Hong,Z. C. Lu,Y. H. Liu,Q. M. He,W. Jiang,M. Q. Zeng 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12
Supersaturated solid–solutions in a W–Cr alloy system were fabricated by conventional milling and plasma milling. The differentextension mechanisms of the solid solubility that were created by ball milling with and without discharge plasma werestudied. The solid–solubility of Cr in W for the P-milling W–Cr alloy system was higher, which indicates that plasma millingpromotes the formation of W(Cr) solid–solution more easily than conventional milling. According to Miedema’s model, inthe W–Cr alloy system, the free-energy change to form a W(Cr) solid solution by plasma milling is reduced compared withconventional milling because of the heating effect of the discharge plasma. Therefore, a higher stored energy in the grainboundaries and dislocations of the W–Cr nanograins during plasma milling makes it easier to overcome the thermodynamicbarrier in the formation of a solid–solution, when compared with conventional milling.
M. Q. Zeng,J. L. Tu,M. Zhu,W. Wang,J. W. Liu,Z. C. Lu 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.9
The effects of plasma discharge intensity on the microstructure evolution of ball-milled tungsten (W)–carbon (C)–cobalt (Co)mixtures and the formation mechanism of ultrathin plate-like tungsten carbide (WC) grains prepared by ball milling with andwithout plasma discharge were investigated. It was found that increasing the plasma discharge intensity during ball millingobviously promoted the formation of a thin flake-like W phase because of the electroplasticity effect and simultaneouslylowered the carburization temperature between W and C. A combination of high hardness and transverse rupture strength of92.9 HRA and 3659 MPa, respectively, was obtained for the WC–8Co alloy fabricated by plasma milling at a gas pressure of5 × 103 Pa with a dielectric barrier discharge layer thickness of 3 mm. These properties were mainly attributed to the markedlylowered activation energy of the WC phase and generation of highly oriented ultrathin plate-like WC grains by plasma milling. The combination of the flake-like structure of the plasma-milled W aggregate and high specific interfacial area and shortdiffusion distance of W/C were readily inherited by the ultrathin plate-like WC grains in the sintered WC–Co hardmetals.
Monitoring the Comfort of Poultry Body by Infrared Thermography
( C. H. Tsou ),( T. T. Lin ),( C. C. Liu ),( K. W. Hsieh ),( Y. C. Tsai ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
At present, the environmental regulation of Taiwanese traditional poultry farm is based on the information collected by the ambient temperature and humidity sensor. However, this method is unable to know the situation of the poultry directly. The purpose of this study is to collect poultry body surface temperature information directly by the infrared thermal imager. The relationship between poultry body surface temperature and temperature-humidity index (THI) is studied for estimating the actual feeling of poultry at different conditions. The Raspberry Pi, infrared thermal imaging sensor, environmental sensors were integrated for collecting the poultry body temperature and environmental information. The collected poultry infrared thermal images were divided into head, foot and wing different areas for the analysis. The environment temperature, humidity, air velocity and poultry surface temperature were continuous recorded for four weeks. The measured chicken’s surface temperature from infrared image sensor changes with the THI. The temperature change of the chicken’s foot is larger than the temperature of chicken’s head, and wing. The correlation between poultry surface temperature and THI, and temperature-humidity-velocity index (THVI) were calculated. According to the results, the correlation between poultry surface temperature and THI is higher than the correlation between poultry surface temperature and THVI. It shows that THI impacts on the poultry surface temperature. The poultry surface temperature can be detected by the infrared camera for poultry house environment control.
Image Coding and Processing in Personal Computer
Cheung, R. W. L.,Liu, P. C. K.,Leung, C. K. 대한전자공학회 1994 ISPACS:Intelligent Signal Processing and Communica Vol.1 No.1
A simple technique based on PC image coding is developed to simulate a printer output of a picture on the monitor screen in a PC. During the process of .simulation of the printed image produced by the selected matrix printer, the image ,processing techniques are applied Most ,importantly, a palette consists of 20 pre-defined gray levels is read through by a scanner and the resulted file is seat to the PC for subsequent processing and analysis.