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588 results on '"Ge, Kun"'

6. RACS2: A Framework of Remote Autonomous Control System for Telescope Observation and its application

Author

Wang, Zhi-yue, Zhang, Guang-yu, Wang, Jian, Zhang, Qian, Genga, Zhe, Zhu, Ze-yu, Gu, Jia-Yao, Zheng, Zhen-hao, Zhu, Lu-cheng, Ge, Kun, and Zhang, Hong-fei

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

As the demand of astronomical observation rising, the telescope systems are becoming more and more complex. Thus, the observatory control software needs to be more intelligent, they have to control each instrument inside the observatory, finish the observation tasks autonomously, and report the information to users if needed. We developed a distributed autonomous observatory control framework named Remote Autonomous Control System 2nd, RACS2 to meet these requirements. The RACS2 framework uses decentralized distributed architecture, instrument control software and system service such as observation control service are implemented as different components. The communication between components is implemented based on a high-performance serialization library and a light-weighted messaging library.The interfaces towards python and Experimental Physics and Industrial Control System (EPICS) are implemented, so the RACS2 framework can communicate with EPICS based device control software and python-based software. Several system components including log, executor, scheduler and other modules are developed to help observation. Observation tasks can be programmed with python language, and the plans are scheduled by the scheduler component to achieve autonomous observation.A set of web service is implemented based on the FastAPI framework, with which user can control and manage the framework remotely.Based on the RACS2 framework, we have implemented the DATs telescope's observation system and the space object observation system.We performed remote autonomous observation and received many data with these systems., Comment: 22 pages, 16 figures

Published
2022

15. Two wavelength band emission WGM lasers via photo-isomerization

Author

Ge Kun, Ruan Jun, Liang Ningning, Guo Dan, Cui Libin, Iqbal Naeem, and Zhai Tianrui

Subjects
two wavelength band emission, wgm laser, photo-isomerization, esipt, Physics, QC1-999
Abstract

Wavelength switchable microcavity is indispensable component for various integrated photonic devices. However, achieving two wavelength band emission of the whispering gallery mode (WGM) laser is challenging. Here, we propose a strategy to realize two wavelength band emission WGM lasers activated by photo-isomerization based on excited-state intramolecular proton transfer (ESIPT) process in isolated/coupled polymer microfiber cavities. The WGM microcavity is built by highly polarized organic intramolecular charge-transfer (ICT) dye molecules. The two cooperative gain states of ICT dye molecules can be controlled by optimizing energy levels. Thereby, the lasing wavelength can be reversibly switched under photo-isomerization activated in the ESIPT energy-level progress. The photonic bar code can be generated by following the strategy of proposed design. This work provides a promising route to achieve switchable WGM laser in on-chip photonic integration.

Published
2023
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50. Recent advances of MOF-based SERS substrates in quantitative analysis of food contaminants: a review.

Author

Gu, Ying, Pu, Xujun, Chen, Jinxin, Yi, Lunzhao, Bi, Junlong, Duan, Fengmin, and Ge, Kun

Subjects
SERS spectroscopy, SUBSTRATES (Materials science), DNA fingerprinting, FOOD chemistry, FOOD safety
Abstract

Advancements in food-contaminant detection technologies can significantly improve food safety and human health. Surface-enhanced Raman spectroscopy (SERS) has become the preferred analytical method for food-safety detection owing to its numerous advantages, which include unique 'molecular fingerprinting' features, high sensitivity, rapid responses, and non-invasive characteristics. Raman-signal enhancements rely heavily on high-performance SERS substrates. In recent years, metal–organic framework (MOF)-based SERS substrates have gained attention as promising candidates for developing SERS technologies owing to their distinctive structures and functions. This review comprehensively examines recent advances in MOF-based SERS substrates, focusing on the main role of MOFs in SERS substrates as well as their typical categories and structures, construction methods, and representative applications in food-contaminant detection. First, the primary roles of MOFs in SERS substrates are briefly introduced. Next, a comprehensive overview of the typical categories and structures of MOF-based SERS substrates is discussed. Subsequently, a fundamental view of the general construction methods for MOF-based SERS substrates is presented. Next, the main applications of MOF-based SERS substrates for food-contaminant detection are summarised. Finally, challenges and perspectives, including improvements in SERS performance and stability, and the unification of SERS mechanisms, are addressed and discussed. [ABSTRACT FROM AUTHOR]

Published
2024
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