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    Wyświetlanie 1-6 z 6
    Tytuł:
    Comprehensive importance analysis for repairable system components based on the GO method
    Autorzy:
    Jiang, Xiuhong
    Wang, Yuying
    Li, Jiaxin
    Ye, Linlin
    Powiązania:
    https://bibliotekanauki.pl/articles/2200937.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    component importance
    electric aircraft
    GO method
    reliability analysis
    permanent magnet
    synchronous motor
    Opis:
    In order to effectively improve the reliability level of the permanent magnet synchronous motor (PMSM) drive system of electric aircraft, a component importance analysis based on the GO method for the repairable systems is proposed. Firstly, the system reliability model GO diagram is established according to the hardware schematic diagram of the PMSM drive system. Secondly, the steady-state availability and failure importance of the components are calculated. In addition, the criteria importance through intercriteria correlation (CRITIC) is adopted to determine the objective weights of steady-state availability and failure importance. The combined weighting is employed to obtain the importance of key components. Meanwhile, a system redundancy design based on the importance of components is proposed to provide data support for the design of the system. Finally, the feasibility and effectiveness of the proposed method are evaluated by an example of an electric aircraft PMSM drive system. This method provides a supporting basis for the optimization design of the entire system.
    Źródło:
    Eksploatacja i Niezawodność; 2022, 24, 4; 785--794
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selective depression of Escherichia coli on flotation of collophanite and dolomite
    Autorzy:
    Li, JiaXin
    Nie, GuangHua
    Jiang, Ying
    Luo, GuoJv
    Li, Jie
    Powiązania:
    https://bibliotekanauki.pl/articles/2146918.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    Escherichia coli
    collophanite
    dolomite
    flotation
    phosphate rock
    Opis:
    The phosphate rock flotatio n test was carried out using Escherichia coli E. coli ) as a depressant of dolomite. The results showed that E. coli had a great selective depression on dolomite during flotation. With E. coli as a depressant of dolomite, a useful beneficiation index of phosphorus concentrate with P2O5 grade of more than 30% and MgO content less than 1.2% can be obtained by closed circuit of one stage roughing and one stage cleaning. Furthermore, the depression mechanism of E. coli was studied by ad sorption experiments, infrared spectrum, and zeta potential. This study shows that the adsorption ability of E. coli onto dolomite is stronger than that of collophanite. When the pH is greater than 6, E. coli are chemically adsorbed on the surface of the c ollophanite and dolomite,which also increases the negative charge on the surface of the two minerals. The selective adsorption of E. coli cells to dolomite was best when the pH value is about 7.8.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 4; art. no. 150604
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy management strategy of dual planetary hybrid electric vehicle based on optimal transmission efficiency
    Autorzy:
    Wang, Shangxu
    Li, Jiaxin
    Shi, Dehua
    Sun, Xiaoqiang
    Yao, Yong
    Powiązania:
    https://bibliotekanauki.pl/articles/279483.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    power split hybrid electric vehicle
    mechanical point
    fuzzy torque distribution
    fuel economy
    Opis:
    A power split hybrid electric vehicle with dual planetary gear sets is studied in this paper. Firstly, the power split and circulation phenomenon are further described by analyzing a speed and torque relationship between the engine, motors and the output shaft based on the lever analogy. The transmission efficiency and the electric power ratio are then obtained. The working modes of the hybrid electric vehicle (HEV) are divided according to the system operation mechanism. On this basis, the engine optimal operating line (OOL) control strategy and the mechanical point (MP) control strategy are designed. Furthermore, a fuzzy controller is designed to realize the optimal torque distribution of the engine and the motors in the MP control strategy. Simulation results demonstrate that the MP control strategy can guarantee a higher efficiency of the transmission system, which also shows good performance in improving fuel economy of the HEV by adjusting the engine operating point.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2019, 57, 2; 383-396
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pore structure and surface properties of diatomite with mechanical grinding and its influence on humidity control
    Autorzy:
    Hu, Zhibo
    Zheng, Shuilin
    Li, Jinyu
    Zhang, Shuaiqian
    Liu, Min
    Wang, Zhicheng
    Li, Jiaxin
    Sun, Hongjuan
    Powiązania:
    https://bibliotekanauki.pl/articles/2175445.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    diatomite
    mechanical grinding
    pore structure
    surface properties
    humidity control performance
    Opis:
    Mechanical grinding (MG) is an effective method to regulate the pore structure and surface properties of mineral material. Grinding diatomite samples were prepared by horizontal sander under different grinding time. The pore structure and surface properties of grinding samples were characterized systematically by the particle size analysis, low temperature nitrogen adsorption, MIP, fractal theory, XRD, SEM, TEM, FTIR and surface hydroxyl density analysis. The humidity control performance (HCP) of grinding diatomite was tested under different temperature and relative humidity. The relationship among pore structure, surface properties and HCP was analyzed. The results show that macroporous is more easily damaged by mechanical force than mesoporous, and the internal blind holes structure can be opened. The HCP of diatomite is positively correlated with the specific surface area, mesoporous volume, the inhomogeneity of macroporous structure and the number of hydroxyl groups, while negatively correlated with the proportion of macroporous volume.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 153509
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    ChatGPT: Cross cultural tourism research imperative
    Autorzy:
    Chen, Sirong
    Zhang, Ke
    Li, Xiaonan
    Ye, Huiyue
    Lin, Katsy Jiaxin
    Law, Rob
    Powiązania:
    https://bibliotekanauki.pl/articles/2199826.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Ekonomiczny w Katowicach
    Tematy:
    ChatGPT
    large language models
    tourism
    cross-cultural analysis
    Opis:
    Aim/purpose – Cultural differences play an influential role in driving tourism development and varying outcomes of technology acceptance. The impact of ChatGPT on tourism is yet to be explored. Therefore, this study discussed how ChatGPT may influence tourism development and management in different cultural contexts. Design/methodology/approach – Drawing specifically on individualism and collectivism from Hofstede’s cultural dimensions theory, this study compared the differences in the perception of ChatGPT between Oriental and Western cultures. Findings – Individualism and collectivism explain the diversity of perception on ChatGPT between Oriental and Western cultures. Research implications/limitations – Implications and suggestions are provided to academia and industry accordingly. Particularly, the difference between technological concepts and tools is highlighted to avoid having excessive expectations toward tools. Originality/value/contribution – This study extends the research on tourism and Artificial Intelligence and advocates additional attention to the imperative of cross-cultural differences regarding ChatGPT and tourism.
    Źródło:
    Journal of Economics and Management; 2023, 45; 137-146
    1732-1948
    Pojawia się w:
    Journal of Economics and Management
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An early warning method for a slope based on the increment ratio of anchor cable internal force
    Autorzy:
    Feng, Jianhua
    Chen, Jiaxin
    Li, Jian
    Zhang, Yu
    Guo, Jianhua
    Qiu, Hongyong
    Powiązania:
    https://bibliotekanauki.pl/articles/2203436.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Prestressed anchor cables are active reinforcement to improve slope stability. However, the anchoring is not a permanent guarantee of stability, and the slope retains a potential risk of instability. From the perspective of the internal force of anchor cables, a new early warning method for the safety of the slope is provided, and a slope analysis model is established. With the increase in the strength reduction factor, the internal force increment curves of anchor cables under different prestresses are obtained. The point corresponding to strength reduction factors λ1 and λ2 represents a warning point. Key conclusions are drawn as follows: (1) The internal force of an anchor cable can be used to judge the stability of the slope strengthened by a prestressed anchor cable. (2) A warning index based on the internal force increment ratio of anchor cables is established. (3) The internal force increment ratio of anchor cables eliminates the influence of the initial prestress and is convenient for engineering applications.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 1; 553--569
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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