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Wu Jun(Jun Wu),Luo Yuxin(Yuxin Luo) 아시아사회과학학회 2022 Jornal of Asia Social Science Vol.8 No.1
The problem of “shelling” of specialized farmers’ cooperatives is that farmers’ cooperatives neither insist cooperation essence nor farmer actual participation, and there is no normal operation. The “shelling” problem of farmers’ cooperatives in Guizhou Province is manifested in the three phenomena of “titular form”, “be more in name than in reality” and “unsustainable form”. For the unsustainable farmers’ cooperatives, we can take measures such as improving the organizational structure and management system, exploring joint construction mechanism among the rural credit cooperatives, supply and marketing cooperatives and farmers’ cooperatives, exploring technical services, strengthening the connection of interests and cultivating talent through multiple channels to solve the difficult problems existing in “organization, capital, market, talent, motivation” of the farmers’ cooperatives, achieving the high-quality development.
Superhydrophobic Ag–Cu Composite Metal Film as Surface-Enhanced Raman Scattering Substrate
Jianchao Wang,Hongsheng Luo,Xuliang Song,Xihong Zu,Jie Zhang,Yuxin Gu,Guobin Yi 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.7
In this paper, a superhydrophobic Ag–Cu composite metal film was fabricated as surface-enhanced Raman scattering substrate. Ag–Cu composite metal film was prepared from galvanic displacement on commercial copper foil. The prepared silver films were modified by PFDT to create a stable superhydrophobic SERS platform. Superhydrophobic substrates were characterized by a variety of characterization methods, including scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-Vis, XPS and Raman spectra. The superhydrophobic substrate could enrich probing molecules with the volatilization of solvent. Mathematical model was presented and applied to investigate concentration factor of hydrophobic substrate. The measurements were in good agreement with the calculation results. The superhydrophobic Ag–Cu composite metal film can reduce the detection limits and provide a new way to prepare efficient SERS substrates for ultra-low concentration detection.
Polarization Error Analysis of an All-Optical Fibre Small Current Sensor for Partial Discharge
Gaifang Xin,Jun Zhu,Chengming Luo,Jing Tang,Wei Li,Yuxin Cao,Haiyan Xu 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.5
In view of the characteristics of the small amplitude of a current signal, an all-optical fi bre small-current sensor for partial discharge is devised. A novel type of sensor head with electric winding light is proposed. A complete optical model of the optical fi bre current sensor is developed under the eff ect of polarization error factors. In addition, the eff ect of polarization error factors on the optical fi bre sensing system is simulated. The simulation results show that as the extinction ratio increases, the output relative error of the optical fi bre small-current sensor decreases. The eff ect of the fast and slow axis misalignment errors of a polarizing beam splitter is similar to the eff ect of the alignment angle error of an optical fi bre polarizer. It is observed that the relative error curve follows a sine function. Meanwhile, the output relative error increases fi rst and then oscillates with an increase in the linear birefringence. We conclude that the linear birefringence of the sensing optical fi bre is the main error source for the measurement accuracy of the sensing system. Finally, an experimental system for the optical fi bre small-current sensor is implemented. The experimental results show that the eff ect of linear birefringence on the fi bre current sensing system can be suppressed by introducing a large amount of circular birefringence into the sensing optical fi bre. The theoretical mechanism of these errors is analysed, which can be applied to implement corresponding measures to reduce the eff ect of error factors on the sensing system and further improve the measurement accuracy of the optical fi bre small-current sensor.