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Controlling Ejection State of a Pneumatic Micro-droplet Generator Through Machine Vision Methods
Fei Wang,Yiwei Wang,Weijie Bao,Hui Zhang,Jiangeng Li,Zhihai Wang 한국정밀공학회 2020 International Journal of Precision Engineering and Vol.21 No.4
Pneumatic micro-droplet ejection is a printing technique that has potential applications in many fi elds, especially in thefi eld of bio-printing. The ejection is via a solenoid valve being briefl y turned on, so that high pressure gas enters the liquidreservoir, forming a gas pressure pulse, forcing the liquid out through a tiny nozzle to form a micro-droplet. For bio-printingapplications, the bio-inks are typically non-standard. The diffi culties are not only that the initial working parameters arediffi cult to set, but also the working conditions change over time in many cases. In order to maintain a stable single-dropejection state, a machine vision based ejection monitoring was designed to obtain the number, positions and sizes of thedroplets for each ejection, and a feedback control is realized by adjusting the “ON” time of the solenoid valve or the gaspressure at the front end of the solenoid valve.
An exchange bias observed in Tb/Cr/FeCo trilayers with ultrathin Cr layer at low temperature
Sun Li,Li Xiaoyan,Zhang Yiwei,Song Hengbo,Zhang Wen,Kou Zhaoxia,Zhang Dong,Liu Xiaoying,Fei Hongyang,Pan Mengmei,Zhao Zhibin,Zhai Ya 한국물리학회 2022 Current Applied Physics Vol.44 No.-
Positive exchange bias field (He) is observed in Tb/Cr (tCr)/FeCo trilayers at 5 K without cooling field, and negative He for Tb/FeCo bilayer. The negative He of Tb/FeCo implies the FM coupling at the interface due to Co and Fe dominate in the magnetization of the ferrimagnetic interlayer alloy of FeCo and Tb. With the inserting of Cr layer, this situation is broken, and the positive He implies the antiferromagnetic interlayer coupling. A peak of He = 6.0 mT for trilayers with tCr = 1.5 nm is corresponding to the minimum value of coercivity as a function of tCr at 5 K, which is used to study the effect of the cooling field (Hfc) on He as a function of temperature. It is found that Hfc of 100 mT triggers He from positive to negative at T ≤ 15 K. The magnetoresistance results also confirm the coexistence of multiple MR mechanisms in these trilayers.
Jun Ma,Shaojun Ruan,Jianqiang Hu,Yuanbao Sun,Yiwei Fei,Xufeng Jiang,Shibao Dong,Teng Chen,Nan Wu 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.92 No.-
Dose the blackened lubrication oil needs to be replaced forflying safety? Since there is very limited roomfor inaccurate assessment of oil quality due to strictflying safety standards, much aviation lubrication oilis disposed in advance long before their service life. More important, aircrafts still face the fatalchallenges from unpredictable lubrication oil deterioration. Color change is surely a significant signal to diagnose the quality of lubrication oils. Based on thecolorimeter, the color numbers of the testing lubrication oils are measured in this paper to identify thecolor variation degree of the oxidized lubrication oils. Then the molecular structures of the oxidizedlubrication oils are investigated tofind the intrinsic relationship between the oxidation products andcolor numbers. Based on key performances of the oxidized oil samples, the oil quality is undoubtfullydeteriorated which is coincident with the variation of color number. The color numbers of the usedaviation lubrication oils could provide an alternative way to readily and quickly measure the declinedegree and residual lifetime.