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    Wyświetlanie 1-5 z 5
    Tytuł:
    Risk assessment of tunnel portals in the construction stage based on fuzzy analytic hierarchy process
    Autorzy:
    Deng, Xianghui
    Wang, Rui
    Xu, Tian
    Powiązania:
    https://bibliotekanauki.pl/articles/230450.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    portal tunelu
    etap budowy
    proces rozmytej hierarchii analitycznej
    FAHP
    ocena ryzyka
    tunnel portal
    construction stage
    fuzzy analytic hierarchy process
    risk assessment
    Opis:
    This study presents a fuzzy analytic hierarchy process (FAHP) by integrating analytic hierarchy process (AHP) and fuzzy cognition to evaluate the construction risks of tunnel portals. Wuguanyi Tunnel is taken as the research objective to validate the performance of the proposed method. The result shows that the proposed decision making method can effectively identify risk factors and determine the risk level during the construction of tunnel portals. Finally, the corresponding control measures during the construction of the Wuguanyi Tunnel portal are proposed according to the risk assessment results.
    Źródło:
    Archives of Civil Engineering; 2018, 64, 4/I; 69-87
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigating freeze-proof durability of air-entrained C30 recycled coarse aggregate concrete
    Autorzy:
    Deng, Xianghui
    Liu, Yiyuan
    Wang, Rui
    Powiązania:
    https://bibliotekanauki.pl/articles/1852544.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    domieszka napowietrzająca
    kruszywo gruboziarniste
    kruszywo z recyklingu
    cykl zamrażanie-odmrażanie
    mrozoodporność betonu
    air-entraining admixture
    recycled aggregate
    coarse aggregate
    concrete
    freeze-thaw cycle
    freeze-proof durability
    Opis:
    Incorporation of air-entraining agent has improved recycled concrete freeze-proof durability. However, it is very lacking to study the role of the entraining agent. In this paper, the influence of an air-entraining agent on freeze-proof durability for the ordinary C30 recycled coarse aggregate (RCA) concrete and air-entrained C30 RCA concrete was investigated with the laboratory comparative tests. The mass loss, the dynamic modulus of elasticity, ultrasonic wave velocity and cubic compressive strength were measured during freeze-thaw cycles. The test result showed the concrete’s performance was similar to the ordinary concrete and was better than that of other recycled concretes when the content of RCA was 50% and 0.03% of air-entraining agent was added for C30 RCA concrete. Meanwhile, the addition of air-entraining agent has an improved effect on the performance of recycled concrete, but the effect was limited.
    Źródło:
    Archives of Civil Engineering; 2021, 67, 2; 507-524
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Intergenerational Care, Intergenerational Support and Subjective Well-Being of the Elderly: An Empirical Study Based on CGSS (2017) Micro Data
    Autorzy:
    Shi, Huaping
    Yu, Shengqi
    Wang, Rui
    Xiong, Xinnuo
    Powiązania:
    https://bibliotekanauki.pl/articles/22792647.pdf
    Data publikacji:
    2022-06-21
    Wydawca:
    Polskie Towarzystwo Socjologiczne
    Tematy:
    intergenerational care
    intergenerational support
    subjective well-being
    mediating effect
    Opis:
    Using the micro data of Chinese General Social Survey (CGSS) in 2017, this paper analyzes the logical relationship between intergenerational care, intergenerational support and subjective well-being of the elderly. The study found that intergenerational care can significantly enhance the subjective well-being of the elderly, and there are age and income heterogeneity. Further analysis found that there is a partial mediating effect of intergenerational support in the effect of intergenerational care on the subjective well-being of the elderly. Based on this, it is necessary to build an elderly care service system that is coordinated by home-based community institutions and combined with medical care and health care, vigorously develop an inclusive nursery service system, establish and improve the nursery policy and mechanism, and promote the professional and standardized development of infant care services.
    Źródło:
    Polish Sociological Review; 2022, 218, 2; 187-206
    1231-1413
    2657-4276
    Pojawia się w:
    Polish Sociological Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Freeze-proof durability of concrete incorporating recycled coarse aggregate
    Autorzy:
    Deng, Xianghui
    Xue, Liyuan
    Wang, Rui
    Gao, Xiaoyue
    Powiązania:
    https://bibliotekanauki.pl/articles/231420.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kruszywo recyklingowe
    kruszywo gruboziarniste
    beton
    cykl zamrażanie-odmrażanie
    mrozoodporność
    recycled aggregate
    coarse aggregate
    concrete
    freeze-thaw cycle
    freeze-proof durability
    Opis:
    The recycle of the building and demolition waste could reduce project expenses and save natural resources as well as solve problem about environmental risks incurred during the disposal of building waste. In this study, waste C30 concrete is taken an experimental material. The mass loss, ultrasonic velocity, dynamic modulus of elasticity and cubic compressive strength of recycled coarse aggregate concrete whose coarse aggregate replacement percentage is 25%, 50%, 75%, and 100% are tested and compared with NAC when the cycles of freezing and thawing are 0, 25, 50, 75, 100, 125, 150, 175, and 200 times. The results show: (1) Generally, the loss of mass, ultrasonic velocity, dynamic modulus of elasticity and cubic compressive strength constantly increase with the growth of freezing and thawing cycles. (2) Compared with the recycled concrete of other replacement percentages, the RAC50 shows relatively close performance to NAC in mass loss, the change of dynamic modulus of elasticity and cubic compressive strength. (3) Performances of RAC25 specimens are better than the other RAC specimens for the ultrasonic wave velocity.
    Źródło:
    Archives of Civil Engineering; 2019, 65, 4; 63-80
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parameter identification of PMSM based on dung beetle optimization algorithm
    Autorzy:
    Yang, Xiaollang
    Cui, Yuyue
    Jia, Lianhua
    Sun, Zhihong
    Zhang, Peng
    Zhao, Jiane
    Wang, Rui
    Powiązania:
    https://bibliotekanauki.pl/articles/27309956.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    chaotic mapping
    dung beetle algorithm
    Levy flights
    parameter identification
    permanent magnet synchronous motor
    spiral strategy
    Opis:
    In this paper, a creative dung beetle optimization (CDBO) algorithm is proposed and applied to the offline parameter identification of permanent magnet synchronous motors. First, in order to uniformly initialize the population state and increase the population diversity, a strategy to improve the initialization of the dung beetle population using Singer chaotic mapping is proposed to improve the global search performance; second, in order to improve the local search performance and enhance the convergence accuracy of the algorithm, a new dung beetle position update strategy is designed to increase the spatial search range of the algorithm. Simulation results show that the proposed optimization algorithm can quickly and accurately identify parameters such as resistance, inductance, and magnetic chain of the PMSM, with significant improvements in convergence algebra, identification accuracy and stability.
    Źródło:
    Archives of Electrical Engineering; 2023, 72, 4; 1055--1072
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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