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    Wyświetlanie 1-6 z 6
    Tytuł:
    Research on visible light indoor positioning algorithm based on fire safety
    Autorzy:
    Li, Mao
    Jiang, Feng
    Pei, Cong
    Powiązania:
    https://bibliotekanauki.pl/articles/174338.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    indoor positioning algorithm
    camera
    indoor positioning system
    Opis:
    From the perspective of ensuring life safety, combined with the advantages of high-speed time response and energy conservation of white light emitting diodes (LEDs), the visible light indoor positioning algorithm based on fire safety is proposed in the paper. First, the model is designed which needs three LED lights arranged in a straight line and positioned in the geographically north direction on the top of the model. Then, the proposed algorithm is discussed and analyzed when the camera is located at the center of the model and facing north, when the camera is located at the center of the model and the angle is rotated, and when the camera is located at any position of the model, respectively. It can accurately calculate the current position of the camera, its response speed is fast and the positioning accuracy is high. Furthermore, this paper also verifies the practicability and reliability of the algorithm by designing the visible light indoor positioning system based on fire safety rescue in natural environment and smoke environment. The experimental results show that the positioning error does not exceed 0.70 cm in smoke environment.
    Źródło:
    Optica Applicata; 2020, 50, 2; 209-222
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    “Red wins”, “black wins” and “blue loses” effects are in the eye of beholder, but they are culturally universal: A cross-cultural analysis of the influence of outfit colours on sports performance.
    Autorzy:
    Sorokowski, Piotr
    Szmajke, Andrzej
    Hamamura, Takeshi
    Jiang, Feng
    Sorokowska, Agnieszka
    Powiązania:
    https://bibliotekanauki.pl/articles/430837.pdf
    Data publikacji:
    2014-09-01
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    colors
    boxing
    perception
    competition
    cross-culture differences
    Opis:
    Although many studies have demonstrated an influence of uniform colors on sports performance, there are still more questions than answers regarding this issue. In our study, participants from Poland (N = 147) and China (N = 143) watched a two-minute video of a semi-professional boxing match. The participants viewed six different versions of the same fight - the original was modified to change the colors of the boxers’ trunks (red vs. blue, blue vs. red, blue vs. black, black vs. blue, red vs. black, and black vs. red). We experimentally confirmed that “black wins” and “red wins” effects exist, but in a way that caused an erroneous perception of the number of blows landed by boxers wearing red and black trunks fighting against boxers in blue trunks. We also showed that both effects are similarly strong even in Chinese culture, where the color red has different connotations from those in Western cultures. Additionally, our results suggest that context might play a very important role in the assessments of the boxers - color only influenced the perception of the weaker boxer. Finally, our findings suggest that the topic of the influence of colors on sports competitions has not been thoroughly investigated and further studies are necessary.
    Źródło:
    Polish Psychological Bulletin; 2014, 45, 3; 318-325
    0079-2993
    Pojawia się w:
    Polish Psychological Bulletin
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fault diagnosis method for an aerospace generator rotating rectifier based on dynamic FFT technology
    Autorzy:
    Feng, Sai
    Cui, Jiang
    Zhang, Zhuoran
    Powiązania:
    https://bibliotekanauki.pl/articles/1849142.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aerospace generator
    rotating rectifier
    fault diagnosis
    dynamic Fast Fourier Transform
    feature extraction
    Opis:
    A fault diagnosis method for the rotating rectifier of a brushless three-phase synchronous aerospace generator is proposed in this article. The proposed diagnostic system includes three steps: data acquisition, feature extraction and fault diagnosis. Based on a dynamic Fast Fourier Transform (FFT), this method processes the output voltages of aerospace generator continuously and monitors the continuous change trend of the main frequency in the spectrum before and after the fault. The trend can be used to perform fault diagnosis task. The fault features of the rotating rectifier proposed in this paper can quickly and effectively distinguish single and double faulty diodes. In order to verify the proposed diagnosis system, simulation and practical experiments are carried out in this paper, and good results can be achieved.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 2; 269-288
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical Investigation of the Propagation Characteristics of Surface Transverse Wave Considering Various Quartz Substrate and Electrode Configurations
    Autorzy:
    Jiang, Chao
    Cao, Xiaoli
    Yang, Feng
    Liu, Zejun
    Powiązania:
    https://bibliotekanauki.pl/articles/31339822.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    surface transverse wave
    STW
    interdigital transducer
    IDT
    finite element analysis
    FEA
    quartz
    Opis:
    Featured with a higher velocity, increased power handling capability, and better aging behavior, surface transverse wave (STW) shows more promising prospects than Rayleigh wave nowadays in various sensing applications. The need to design, optimize, and fabricate the related devices motivates the development of modeling and simulation. For this reason, a three-dimensional (3D) finite element (FE) simulation of STW on quartz, considering the crystal cut angle and the electrode effects, is presented in this study. Firstly, we investigated the effects of quartz’s cut angle on the generated waves. Here, the polarized displacements were analyzed to distinguish the wave modes. Secondly, the investigations of the electrode effects on the polarized displacement, phase velocity, and electromechanical coupling factor (K2) were carried out, for which different material and thickness configurations for the electrodes were considered. Thirdly, to examine the excitation conditions of the generated waves, the admittance responses were inspected. The results showed that not only the crystal cut angle but also the density and the acoustic impedance of the interdigital transducer (IDT) material have a strong influence on the excited waves. This article is the first to analyze STWs considering quartz’s cut angle and electrode effect through a 3D FE model. It could provide a helpful and easy way to design, optimize, and fabricate the related surface acoustic wave devices.
    Źródło:
    Archives of Acoustics; 2023, 48, 3; 403-412
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Behavior of damaged TBM tunnel under MJS and Micro-disturbance grouting treatment: a case study
    Autorzy:
    Feng, Shi
    Yang, Yijun
    Jiang, Yexiang
    Li, Yongdi
    Yao, Lianghao
    Chen, Xiaolong
    Powiązania:
    https://bibliotekanauki.pl/articles/27312101.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    system strumieniowy metra
    tunel
    uszkodzenie
    TBM
    technologia
    iniekcja mikrozakłóceniowa
    naprawa
    metro jet system
    damage
    tunnel boring machine
    tunnel
    micro-disturbance grouting
    technology
    treatment
    Opis:
    The operating subway tunnel is often damaged due to excessive deformation in China. In order to ensure the safe for operation, remediation and protection measures must be taken, especially in soft soil areas. This paper presents a case study on remedial scheme of damaged TBM (Tunnel Boring Machine) tunnel adjacent to excavation combining with MJS (Metro Jet System) and micro-disturbance grouting technology in Hangzhou, China. The track bed settlement, horizontal displacement and convergence of the TBM tunnel caused by MJS and micro-disturbance grouting construction were analyzed and discussed. The results showed the characteristics of soil layer under the tunnel have significant influence on the treatment effect. Even if multiple grouting was adopted, the treatment failure may occur under the combination action of external loads such as traffic load or surcharge load, which should be considered when civil engineers design remediation scheme. The results can provide practical experience and guidance for similar treatment scheme of damaged TBM tunnel.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 2; 339--352
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on the cleanliness of super clean coal prepared by water-only cyclone
    Autorzy:
    Liu, Peikun
    Wang, Hui
    Jiang, Lanyue
    Zhang, Yuekan
    Yang, Xinghua
    Li, Xiaoyu
    Li, Feng
    Powiązania:
    https://bibliotekanauki.pl/articles/24085799.pdf
    Data publikacji:
    2023
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    cyclone separating
    chemical deashing
    super clean coal
    surface characteristics
    comparative study
    Opis:
    Maintaining clean and pristine nature is the key to the use of super clean coal (SCC) for coal-based materials or energy combustion. Herein, SCC is prepared by a new water-only cyclone method, and compared the surface characteristics with the SCC products obtained by conventional chemical deashing method. The results indicate that: FTIR analysis revealed that the chemical method changed the original functional group of coal; BET analysis revealed that the SCC products prepared by the water-only method maintained the micropore volume of the raw coal and yielded a uniform and concentrated distribution of pore sizes, however, the chemical method destroying the original pore structure in the coal; SEM-EDS analysis indicated that the surface of SCC particles that were deashed using the water-only cyclone method was smooth and neat, whereas those obtained using the chemical method were seriously corroded, had a rough surface, and the SCC particles were prone to acid residues and precipitates. This study opens an innovative, simple, and clean method for the preparation of SCC, which further expands and enhances the potential application value of SCC.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2023, 59, 3; art. no. 168129
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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