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Shumei Song,Tianlin Yang,Yanqing Xin,Lili Jiang,Yanhui Li,Zhiyong Pang,Maoshui Lv,Shenghao Han 한국물리학회 2010 Current Applied Physics Vol.10 No.2
The GZO/Ag/GZO sandwich films were deposited on glass substrates by RF magnetron sputtering of Gadoped ZnO (GZO) and ion-beam sputtering of Ag at room temperature. The effect of GZO thickness and annealing temperature on the structural, electrical and optical properties of these sandwich films was investigated. The microstructures of the films were studied by X-ray diffraction (XRD). X-ray diffraction measurements indicate that the GZO layers in the sandwich films are polycrystalline with the ZnO hexagonal structure and have a preferred orientation with the c-axis perpendicular to the substrates. For the sandwich film with upper and under GZO thickness of 40 and 30 nm, respectively, it owns the maximum figure of merit of 5.3 × 10-2 Ω-1 with a resistivity of 5.6 × 10-5 Ω cm and an average transmittance of 90.7%. The electrical property of the sandwich films is improved by post annealing in vacuum. Comparing with the as-deposited sandwich film, the film annealed in vacuum has a remarkable 42.8% decrease in resistivity. The sandwich film annealed at the temperature of 350 ℃ in vacuum shows a sheet resistance of 5 Ω/sq and a transmittance of 92.7%, and the figure of merit achieved is 9.3 × 10-2 Ω-1.
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Han Zhou,Tianlin Wang,Li Sun,Xiang Jin 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.1
A disc-type underwater glider (DTUG) has a highly symmetrical full-wing shape that allows it to moveomnidirectionally and have the same hydrodynamic characteristics in all directions in the horizontal plane. Thesecharacteristics make the viscous hydrodynamic coefficients measured by conventional methods unsuitable for simulating the omnidirectional and steering motions of the DTUG. To further reveal the omnidirectional and steeringmotion characteristics of the DTUG, this paper proposes a new theoretical method for calculating the DTUG motion control equations in the velocity frame rather than the body frame. Based on the structural characteristics ofthe DTUG, the motion control equations are derived and then solved using the fourth-order Runge-Kutta method. The omnidirectional and steering motions of the DTUG are simulated in the velocity frame and compared withthe results calculated in the body frame. The results show that the viscous hydrodynamic coefficients obtained byconventional methods are not suitable for analyzing the omnidirectional motion of the DTUG, and the method ofcalculating the motion control equations in the body frame has limitations in studying the steering motion. The newmethod proposed in this paper solves these limitations well and can more accurately reveal the motion characteristics of the DTUG without recalculating the hydrodynamic coefficients. The results also show that the DTUG canchange the heading angle more easily than a torpedo-type underwater glider (TTUG), and the steering radius ismuch smaller, which means that the DTUG has greater flexibility in a small body of water. The DTUG can remainstable when the control variables are within the control range and the new method is adopted.
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