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Friction and wear properties of hydraulic components with ceramic/steel-to-steel pairs
Baofu Kou,Zhenshun Li,Zhang Zhang,Ruiqing Li 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.8
The friction coefficient and wear amount of ceramic/steel-to-steel pairs under various concentrations of high water-based emulsion, load size, and load frequency were investigated through friction and wear test, white light interference 3D surface profiling, scanning electron microscopy, and attached energy spectrometry. The friction and wear conditions of hydraulic components made of different materials are discussed. The ceramic-to-steel pair performs better than the steel-to-steel pair in friction reduction and wear resistance. When the load is 100 N, the frequency is 1 Hz and the concentration is 6 %, and the friction coefficient and wear amount of the ceramic-to-steel pair are the lowest. The degree of abrasive and ploughing wear of various friction pairs is directly proportional to the emulsion concentration and inversely proportional to the working load and frequency. The research results can provide guidance for the manufacture and application of ceramic valves.
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Incoherent Frequency 12-tupling Microwave Signal Generation Scheme Based on Cascade Modulators
Yichao Teng,Pin Zhang,Xin Xu,Baofu Zhang 한국광학회 2021 Current Optics and Photonics Vol.5 No.4
Frequency-multiplication technology based on microwave photonic principles can be used to generate microwave and millimeter wave signals with a wide frequency tuning range. However, the existing cascaded external modulation frequency-tupling scheme needs to ensure the phase coherence of the modulated Radio Frequency (RF) signal, while the phase modulation directly limits the frequency tuning range of the external modulation frequency multiplication. In this paper, a novel approach for generating an incoherent frequency 12-tupling signal with cascade modulation is proposed. The structure of cascaded dual-parallel Mach-Zehnder modulators can generate a frequency 12-tupling signal. The proposed structure uses no filter or phase control of the RF driving signal. Microwave photonic frequencytupling was realized under incoherent conditions. Software simulations and experiments validated the proposed structure and proved that it can generate frequency 12-tupling microwave signals under incoherent conditions. Both the frequency range and reliability of the frequency-tupling system has been improved by the proposed structure.
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Design and Implementation on Spatial Science and Technology Information Database of CSI
Chen, Xiu Wan,Deng, Zheng Quan,Lu, Zhi Gao,Ma, Jia,Lin, Jia Yuan,Zhang, Wen Jiang,Luo, Tianfu,Liu, Baofu 대한원격탐사학회 2000 International Symposium on Remote Sensing Vol.16 No.1
Remote Sensing technology, which is characterized by producing imagery an multi-platform, different temporal and spatial resolution, has greatly improved mankind's capability of acquisition, processing and application of spatial information. The increase of spatial data sources and the development, applications and industrialization of spatial information technology are urging the need of spatial data sharing and exchanging. Based an a brief introduction an the China Spatial Information Network (CSI) and its database system, the CSI Spatial Science and Technology Information Database (SSTID) management system was designed and implemented in this paper.
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