Wyniki wyszukiwania - BazTech

1

Research on the X-ray wavelength division multiplexing technology for blackout region communication

Li Yao, Su Tong, Sheng Lizhi, Xu Neng, Zhao Baosheng

Optica Applicata

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2020

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Vol. 50, nr 4

619--632

EN

After the concept of X-ray communication was proposed, its application in complex electromagnetic environment has received more attention, such as data transmission in re-enter special electro-magnetic condition. In this article, a new type of X-ray source was introduced firstly, which was expected to generate multiple characteristic lines and achieve wavelength division multiplexing technology in X-ray band. Then an experimental platform was built for analyzing transmission characteristics of X-ray photon in various plasma media. Finally, the calculation model for a link power equation was given. Experiment results show that transmittance of 8–18 keV X-ray signal is relatively stable, atomic numbers from 29 to 42 are the most suitable materials for wavelength division multiplexing, the X-ray communication system is expected to realize about 200 kbps data transmission rate in adjacent space.

2

The mining of high risk equipment based on the algorithm of HR-Tree’s decision

Wang Shanyuan, Zhang Yujie, Li Yao, Gao Suisui, Yang Feiling

Diagnostyka

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2020

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Vol. 21, No. 2

51--59

EN

Due to the different construction of various subsystems in the power grid, the information of various systems are not closely connected. Nowadays, the network is complex and changeable where the automation is getting higher. This article takes high-risk equipment set of substation in Liaoyang as the research background. It constructs HR-Tree for the device set, and establishes a high-risk equipment evaluation system which based on the HR-Tree context. Then we calculate high-risk equipment sets in the structure of overall data set. By establishing the original data set and the prior knowledge system of equipment risk, the non-candidate high-risk equipment set is reduced in the local path of the high-risk equipment set. We refer to the process of reducing data as minus branch. After the threshold is established, the branches are reduced and the highest risk equipment set is obtained. Finally, we use the scoring system to find the probability of occurrence of associated devices, such information is more open. Example showed that such methods could effectively express high-risk device sets, and managers could get early warning information based on this. It helps people monitoring the power system, w hich could also provides new ideas for the monitoring project.

3

Flexible strain sensor with good durability and anti-corrosion property based on metal/polymer composite films embedded with silver nanowires

Luan Jinjin, Wang Qing, Zheng Xu, Li Yao

Archives of Civil and Mechanical Engineering

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2020

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Vol. 20, no. 4

528--534

EN

To avoid corrosion in sea water environment and conductive failures under external loads, a highly durable and anti-corrosion film with sandwich structure embedded with silver nanowires was fabricated as a flexible strain sensor. The effects of film size and ambient temperature on the conductivity of the sensor were studied separately. The silver nanowire-embedded strain sensor showed high durability and remained stable even after multiple bending. The PDMS coating could prevent the conductive layer from the external environment effectively. It is found that the sensor can be used effectively in sea water condition. Furthermore, the sensor connected on the steel sheet was applied in the real-time detection of microstrain in the tensile test, and the relationship between ΔR/R0 and strain illustrated high linear relationship and sensitivity. The good durability and anti-corrosion property of the conductive film showed the highly potential application to be used as a flexible strain sensor in salt-water condition.