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20 results on '"Feng, Shaohui"'

5. Novel methods for measuring the optical parameters of the water Cherenkov detector

Author

Li, Xiurong, He, Huihai, Xiao, Gang, Zuo, Xiong, Feng, Shaohui, Wang, Lingyu, Li, Cong, Saeed, Mohsin, and Cheng, Ning

Subjects
Physics - Instrumentation and Detectors, Physics - Applied Physics
Abstract

In this paper, novel methods are presented to measure the optical properties of muon detectors (MDs) in the Large High-Altitude Air Shower Observatory (LHAASO), which can also be used by other experiments. Each MD consists of a cylindrical water Cherenkov detector, with a Tyvek liner containing pure water, and a photomultiplier tube (PMT) mounted on the top. The time distribution of the photons collected by the PMT in the water Cherenkov detector have an approximately exponential distribution, and their decay factor is determined by the photon absorption length in the water, the reflectivity of the inner Tyvek surface, the mean reflecting step length of photons reflected by the inner surface, and the ratio of reflectional Tyvek area to the total inner surface area. By considering the principles of photon propagation in the water Cherenkov detector, we have developed novel methods to measure the water absorption length, the Tyvek reflectivity, and the mean step length of photons. The step length of photons can be determined by measuring the time distribution of the reflected photons hitting the PMT after multiple photons with single wavelength are generated in the tank, with slightly different ratios of the inner Tyvek to the total inner area. The water absorption length and Tyvek reflectivity can be measured simultaneously by the PMT by changing the height of the water, while the step length and Tyvek reflectivity in air can also be measured simultaneously. The proposed novel methods are supported by deduction of formulae and verified by GEANT4 simulations and the prototype experiment.

Published
2018
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7. Research and Application of Substation Safety Control Technology Based on Internet of Things Technology

Author

Wang, Tianzheng, Lu, Zhumao, Feng, Shaohui, Yu, Hua, Liu, Yongxin, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Xu, Zheng, editor, Choo, Kim-Kwang Raymond, editor, Dehghantanha, Ali, editor, Parizi, Reza, editor, and Hammoudeh, Mohammad, editor

Published
2020
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12. The new architecture of smart wheelchair system based on UM-BUS

Author

Feng Shaohui, Zhu Xiaoyan, and Zhang Weigong

Subjects
reconfigurable high speed serial bus, intelligent wheelchair, architecture, easy expansion, high reliability, Electronics, TK7800-8360
Abstract

In this paper, according to the characteristics of reconfigurable high speed serial bus(UM-BUS), a new architecture of intelligent wheelchair system based on UM-BUS is proposed, which is superior to the traditional architecture in scalability and dynamic fault tolerance. Based on the new architecture, a common hardware and software platform is designed. The intelligent wheelchair control system designed in this paper has the characteristics of easy expansion, high reliability and versatility.

Published
2018
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14. A Decoupled Spherical Parallel Mechanism with Sphere Workspace and Its Characteristic

Author

Li Xiang, Li Weimin, Feng Shaohui, Zhang Jianjun, and Yu Shanshan

Subjects
Spherical parallel mechanism, Friction circle, Sphere workspace, Decoupled, Mechanical engineering and machinery, TJ1-1570
Abstract

Aiming at the workspace of existing spherical parallel mechanism is smaller in the field of large spherical workspace application,a decoupling spherical parallel mechanism with sphere workspace is proposed.Firstly,according to the limitation from the friction circle of the revolute joint,the modified mechanism is given,which can provide a sphere workspace,and its number of degree of freedom is analyzed. Secondly,the inverse and forward position for the mechanism is derived with the closed vector method. The expression of the Jacobian matrix is deduced with the relational expression between the input and output parameters of the mechanism. And according to the expression of the Jacobian matrix,the decoupled feature of the proposed parallel mechanism is validated. The theoretical foundation for the application of the mechanism to the sphere workspace is provided.

Published
2018
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18. Antifreeze design for Muon Detector of LHAASO

Author

He Huihai, Cong Li, Zuo Xiong, Yi Zhang, Xiao Gang, Feng Shaohui, Lingyu Wang, and Cheng Ning

Subjects
Physics::Instrumentation and Detectors, Detector, Astrophysics::Instrumentation and Methods for Astrophysics, Effects of high altitude on humans, Atmospheric sciences, Air shower, Observatory, Antifreeze, Ultrapure water, Environmental science, High Energy Physics::Experiment, Water content, Physics::Atmospheric and Oceanic Physics, Muon detector
Abstract

In the Large High Altitude Air Shower Observatory project, Muon detectors will be built at 4400m above sea level. As water cerenkov detector, 44 tons of ultrapure water should be infused into the Muon detector. In this cold area, once the water inside the Muon detector freezes, consequence would be very serious. In this paper, a simulation of water temperature is built, the simulation data are consistent with the temperature data of Muon detector at yangbajing Tibet. Using the same simulation with air temperature, soil moisture and temperature of Dao cheng, an antifreeze solution was designed. Through two years of testing, the design is successful.

Published
2017
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19. EAS thermal neutron detection with the PRISMA-LHAASO-16 experiment

Author

Tian-Lu Chen, R. Zhou, Feng Shaohui, Mao-Yuan Liu, Shuwang Cui, Oleg Shchegolev, Bing-Bing Li, Yury V. Stenkin, Q. Gao, Qichang Huang, Jiadong Yao, Yayun He, Danzeng Luobu, Fengzhao Shen, and Xinhua Ma

Subjects
Physics, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Detector, chemistry.chemical_element, Cosmic ray, Knee region, Scintillator, Mass composition, Thermal neutron detection, Neutron temperature, Optics, chemistry, business, Boron
Abstract

EAS thermal neutrons measurement gives additional valuable advantages to study energy and mass composition of primary cosmic rays especially above the knee region. After success of the PRISMA-YBJ experiment we built a new EAS thermal neutron detection array at Tibet University, Lhasa, China (3700m a.s.l.) in March, 2017. This prototype array consists of 16 EAS en-detectors measuring two main EAS components: hadronic and electromagnetic ones. These detectors use a thin layer of a novel type of ZnS(Ag) scintillator alloyed with natural boron compound for thermal neutron capture. In this report, we introduce principle of the detection technique, deployment of the array, and the test results obtained with the array.

Published
2017
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20. 出版物盗版在中国 ：经济成因及基本对策研究 = Publication piracy in China : economic analysis and countermeasures

Author

冯 韶慧 Feng, Shaohui, Huang, Weihong, and Nanyang Business School

Subjects
Business::General::Economic and business aspects [DRNTU]
Abstract

This thesis attempts to apply various methods including the cost analysis to analyze the current situation of piracy problem in China and to evaluate the effect of various anti-piracy policies and instruments. ​Master of Science (Managerial Economics)

Published
2001

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