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Wyszukujesz frazę "Chen, Junjie" wg kryterium: Autor

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    Wyświetlanie 1-5 z 5
    Tytuł:
    Recent progress, opportunities and challenges in collaborative learning and orchestrating creativity
    Autorzy:
    Chen, Junjie
    Gao, Xuhui
    Yan, Longfei
    Xu, Deguang
    Powiązania:
    https://bibliotekanauki.pl/articles/1194013.pdf
    Data publikacji:
    2015
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Collaborative learning
    Creativity
    Orchestrating learning
    Sociocultural approach
    Teachers working methods
    Opis:
    The role of teacher is increasingly related to designing and arranging collaborative learning situations in which fruitful and creative group work may occur. This thematic review presents recent studies on creativity and collaborative learning from the perspective of the teacher as conductor of learning processes. The precondition for the design and orchestration of these kinds of learning situations is analyzing and understanding of creative and collaborative processes and their contextual adaption. Therefore, the first section of this review focuses on the theoretical vantage points of creativity and collaborative learning mainly from socio-cultural perspective. Based on this theoretical grounding, the second section describes principles for orchestrating productive collaborative learning and supporting creativity from the teacher’s perspective. We discuss three dimensions related to how teachers can bring about collaborative learning and creativity: general pedagogical bases, teachers’ pre- and real-time activities as well as opportunities and challenges for teacher activities. The review is concluded with theoretical and practical implications regarding collaborative learning and creativity.
    Źródło:
    World Scientific News; 2015, 9; 124-143
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An SFA-HMM performance evaluation method using state difference optimization for running gear systems in high-speed trains
    Autorzy:
    Cheng, Chao
    Wang, Meng
    Wang, Jiuhe
    Shao, Junjie
    Chen, Hongtian
    Powiązania:
    https://bibliotekanauki.pl/articles/2172116.pdf
    Data publikacji:
    2022
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    slow feature analysis
    SFA
    performance evaluation
    hidden Markov model
    HMM
    running gear system
    analiza cech
    ocena efektywności
    ukryty model Markowa
    układ biegowy
    Opis:
    The evaluation of system performance plays an increasingly important role in the reliability analysis of cyber-physical systems. Factors of external instability affect the evaluation results in complex systems. Taking the running gear in high-speed trains as an example, its complex operating environment is the most critical factor affecting the performance evaluation design. In order to optimize the evaluation while improving accuracy, this paper develops a performance evaluation method based on slow feature analysis and a hidden Markov model (SFA-HMM). The utilization of SFA can screen out the slowest features as HMM inputs, based on which a new HMM is established for performance evaluation of running gear systems. In addition to directly classical performance evaluation for running gear systems of high-speed trains, the slow feature statistic is proposed to detect the difference in the system state through test data, and then eliminate the error evaluation of the HMM in the stable state. In addition, indicator planning and status classification of the data are performed through historical information and expert knowledge. Finally, a case study of the running gear system in high-speed trains is discussed. After comparison, the result shows that the proposed method can enhance evaluation performance.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2022, 32, 3; 389--402
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    First-principles study on the adsorption structure of water molecules on a pyrite (100) surface
    Autorzy:
    Liu, Yingchao
    Chen, Jianhua
    Li, Yuqiong
    Zhang, Junjie
    Kang, Duan
    Powiązania:
    https://bibliotekanauki.pl/articles/1447970.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    pyrite
    water molecules
    adsorption
    Opis:
    The hydration structure of water molecule adsorption at different coverages of a monolayer on a pyrite (100) surface were simulated using the density functional theory (DFT) method. The results demonstrate that the Fe-O interaction weakens and the adsorption energy per water molecule decreases with increasing water coverage, except at a monolayer coverage of 12/12 (i.e., full coverage). H-S and H-O hydrogen bonds were formed on the nearest surface layer. When large amounts of water molecules adsorb onto the surface, the adsorbed water molecules can be divided into three layers: the layer nearest to the surface, the second nearest to the surface, and the layer farthest from the surface. The thickness of the former two layers is approximately 5.5 Å. The three layers have water densities of 1.12 g/cm3, 1.08 g/cm3, and 0.95 g/cm3, respectively, suggesting that there is a strong interaction between the pyrite surface and water molecules and the influence of surface structure on water adsorption reaches a distance of more than 10 Å. Dynamics simulations suggest that the water molecules close to the mineral surfaces are in an orderly arrangement while those far from the surface are disordered.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 2; 121-130
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue and Corrosion Fatigue of 18Ni Maraging Steel
    Autorzy:
    Yongmei, Zhu
    Junjie, Chen
    Wenxian, Tang
    Weicheng, Cui
    Xiaorong, Wang
    Fang, Wang
    Baoji, Yin
    Powiązania:
    https://bibliotekanauki.pl/articles/2049558.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    corrosion fatigue
    18Ni (250)
    loading frequency
    stress ratio
    3.5%NaCl solution
    Opis:
    This study focused on the fatigue and corrosion fatigue of maraging steel 18Ni (250). The 18Ni (250) samples were tested for axial fatigue in air and 3.5% NaCl solution. The effects of loading frequency and stress ratio on the fatigue strength of 18Ni (250) were studied. In air, the loading frequency was 10 Hz, and the stress ratio was 0.5. However, three loading methods were used in the 3.5% NaCl solution: (i) the loading frequency of 1 Hz and stress ratio of 0.5; (ii) the loading frequency of 1 Hz and stress ratio 0.1, and (iii) the loading frequency 5 Hz and stress ratio 0.5. The corrosion fatigue strength of samples in the 3.5% NaCl solution was 63.3% lower than that of the samples in air. The fractures in the samples were observed after the test.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 1; 321-330
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fatigue and Corrosion Fatigue of 18Ni Maraging Steel
    Autorzy:
    Yongmei, Zhu
    Junjie, Chen
    Wenxian, Tang
    Weicheng, Cui
    Xiaorong, Wang
    Fang, Wang
    Baoji, Yin
    Powiązania:
    https://bibliotekanauki.pl/articles/2049667.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    corrosion fatigue
    18Ni (250)
    loading frequency
    stress ratio
    3.5%NaCl solution
    Opis:
    This study focused on the fatigue and corrosion fatigue of maraging steel 18Ni (250). The 18Ni (250) samples were tested for axial fatigue in air and 3.5% NaCl solution. The effects of loading frequency and stress ratio on the fatigue strength of 18Ni (250) were studied. in air, the loading frequency was 10 Hz, and the stress ratio was 0.5. however, three loading methods were used in the 3.5% NaCl solution: (i) the loading frequency of 1 Hz and stress ratio of 0.5; (ii) the loading frequency of 1 Hz and stress ratio 0.1, and (iii) the loading frequency 5 Hz and stress ratio 0.5. The corrosion fatigue strength of samples in the 3.5% NaCl solution was 63.3% lower than that of the samples in air. The fractures in the samples were observed after the test.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 2; 381-390
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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