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	A circular economy system for breaking the development dilemma of 'ecological Fragility Economic poverty' vicious circle: A CEEPS-SD analysis 期刊论文 OAI收割 JOURNAL OF CLEANER PRODUCTION, 2019, 卷号: 212, 页码: 381-392 作者: Cheng, Hao; Dong, Suocheng; Li, Fujia; Yang, Yang; Li, Yu \| 收藏 \| 浏览/下载：66/0 \| 提交时间：2019/05/22 Circular economy system CEEPS-SD model Simulation and improvement Ecological economic effects FPVC development dilemma
	A circular economy system for breaking the development dilemma of 'ecological Fragility Economic poverty' vicious circle: A CEEPS-SD analysis 期刊论文 OAI收割 JOURNAL OF CLEANER PRODUCTION, 2019, 卷号: 212, 页码: 381-392 作者: Cheng, Hao; Dong, Suocheng; Li, Fujia; Yang, Yang; Li, Yu \| 收藏 \| 浏览/下载：16/0 \| 提交时间：2019/05/22 Circular economy system CEEPS-SD model Simulation and improvement Ecological economic effects FPVC development dilemma
	A circular economy system for breaking the development dilemma of 'ecological Fragility Economic poverty' vicious circle: A CEEPS-SD analysis 期刊论文 OAI收割 JOURNAL OF CLEANER PRODUCTION, 2019, 卷号: 212, 页码: 381-392 作者: Cheng, Hao; Dong, Suocheng; Li, Fujia; Yang, Yang; Li, Yu \| 收藏 \| 浏览/下载：17/0 \| 提交时间：2019/05/22 Circular economy system CEEPS-SD model Simulation and improvement Ecological economic effects FPVC development dilemma
	Comparison and simulation of subpixel imaging modes for linear CCD (EI CONFERENCE) 会议论文 OAI收割 2012 3rd International Conference on Information Technology for Manufacturing Systems, ITMS 2012, September 8, 2012 - September 9, 2012, Qingdao, China 作者: Li Y.; He B.; Li Y.; Li Y.; Li Y. 收藏 \| 浏览/下载：36/0 \| 提交时间：2013/03/25 Subpixel technique of linear CCD is effective to enhance the spatial resolution without increasing the focal length of optics and reducing the pixel size. To compare image quality of two main subpixel imaging modes quincunx sampling and four-point sampling a method to quantitatively evaluate image quality of subpixel based on MTF was proposed. The MTF of quincunx and four-point sampling modes were derived. Analytical results shows that theoretical limiting resolution of quincunx sampling and four-point sampling is improved to 1.4 and 1.86 times respectively and MTF values at Nyquist frequency of two modes are increased by 0.1106 and 0.1679 respectively. MTFA in (0 0.5) of two subpixel imaging modes were calculated and results illustrates that four-point sampling offers much more improvement with image quality than quincunx sampling at the cost of double amount of data. A model for simulating subpixel imaging using Matlab was established and simulation results of spoke target verify the theoretical analysis. (2012) Trans Tech Publications Switzerland.
	Design of motion adjusting system for space camera based on ultrasonic motor (EI CONFERENCE) 会议论文 OAI收割 International Symposium on Photoelectronic Detection and Imaging 2011: Space Exploration Technologies and Applications, May 24, 2011 - May 26, 2011, Beijing, China 作者: Sun Z. 收藏 \| 浏览/下载：84/0 \| 提交时间：2013/03/25 Drift angle is a transverse intersection angle of vector of image motion of the space camera. Adjusting the angle could reduce the influence on image quality. Ultrasonic motor (USM) is a new type of actuator using ultrasonic wave stimulated by piezoelectric ceramics. They have many advantages in comparison with conventional electromagnetic motors. In this paper some improvement was designed for control system of drift adjusting mechanism. Based on ultrasonic motor T-60 was designed the drift adjusting system which is composed of the drift adjusting mechanical frame the ultrasonic motor the driver of Ultrasonic Motor the photoelectric encoder and the drift adjusting controller. The TMS320F28335 DSP was adopted as the calculation and control processor photoelectric encoder was used as sensor of position closed loop system and the voltage driving circuit designed as generator of ultrasonic wave. It was built the mathematic model of drive circuit of the ultrasonic motor T-60 using matlab modules. In order to verify the validity of the drift adjusting system was introduced the source of the disturbance and made simulation analysis. It designed the control systems of motor drive for drift adjusting system with the improved PID control. The drift angle adjusting system has such advantages as the small space simple configuration high position control precision fine repeatability self locking property and low powers. It showed that the system could accomplish the mission of drift angle adjusting excellent. 2011 SPIE.