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    Wyświetlanie 1-4 z 4
    Tytuł:
    The associations of work style and physical exercise with the risk of work-related musculoskeletal disorders in nurses
    Autorzy:
    Yao, Yongcheng
    Zhao, Shan
    An, Zhen
    Wang, Shouying
    Li, Hongbin
    Lu, Lingeng
    Yao, Sanqiao
    Powiązania:
    https://bibliotekanauki.pl/articles/2161988.pdf
    Data publikacji:
    2019-02-27
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    risk factors
    nurses
    physical Exercise
    work-related musculoskeletal disorders
    work style
    staying up
    Opis:
    Objectives This study aimed to investigate the prevalence of work-related musculoskeletal disorders (WMSD) in nurses, and to explore the association of work style and physical exercise with WMSD in this professional group. Material and Methods In this study, a cross-sectional survey design was applied. A questionnaire survey was conducted on 692 nurses in 5 municipal hospitals, in the period August–October 2015. The survey included personal information, lifestyle, physical exercise and symptoms of WMSD. Chi² test and logistic regression were used to identify the risk factors of WMSD. Results The prevalence of WMSD was 84% in all parts of the body in the previous year, with the highest prevalence in the neck (68.2%), followed by waist (67.6%) and shoulder (54.6%). Both univariate and multivariate analyses showed that physical exercise, night shifts and staying up late were associated with WMSD in nurses. The lack of exercise, night shifts and a tendency to stay up significantly increased the risk of WMSD (p < 0.05). Conclusions The prevalence of musculoskeletal disorders among the municipal hospital nursing staff is high. An elevated risk of WMSD is observed in nurses who do not do exercises, work shifts and stay up late. Int J Occup Med Environ Health. 2019;32(1):15–24
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2019, 32, 1; 15-24
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental study on radial decoupling charge blasting with air and water
    Autorzy:
    Yang, Deqiang
    An, Huaming
    Lei, Zhen
    Powiązania:
    https://bibliotekanauki.pl/articles/1402332.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    radial decoupling charge
    concrete model
    strain
    blasting lumpiness
    boulder yield
    Opis:
    In order to investigate the effects of the different medium on the initial impact pressure and fragmentation of the hole wall under radial decoupling charge, this paper analyzes and compares the initial impact pressure of hole wall and the size of blasting lumpiness theoretically when air and water are used as a coupling medium. Combined with blasting model test, strain datas are collected by high-speed multi-channel dynamic stress testing system, and the lumpiness of the model test is sieved and measured. The blasting lumpiness is analyzed by G–G–S distribution function. The results show that compared with the air radial decoupling charge, the water radial decoupling charge has higher blasting peak pressure and more uniform lumpiness. According to the relation between peak strain pressure and decoupling coefficient, the optimal decoupling coefficients of air and water are 1.71 and 1.67, respectively. The results show that the best blasting effect can be achieved by using a small hole diameter of water-decoupling charge compared with air-decoupling charge. When the decoupling coefficient is 1.50, the average lumpiness size, distribution of large block and boulder yield of blasting lumpiness in water-decoupling medium are minimum, and only the average lumpiness size and distribution of large block are minimum in airdecoupling medium. Applying the test results to the smooth blasting of cutting has certain guiding significance for improving the blasting effect.
    Źródło:
    Mining Science; 2020, 27; 265-281
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of explosion stress field of air radial decoupling charge
    Autorzy:
    Yang, Deqiang
    Lei, Zhen
    An, Huaming
    Powiązania:
    https://bibliotekanauki.pl/articles/1402294.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa
    Tematy:
    air radial decoupling charge
    explosion stress field
    concrete model
    numerical simulation
    Opis:
    In order to study the effect of air radial decoupling charge on blasting excavation effect of slope, the effect of radial decoupling coefficient on explosive stress field in rock mass is analyzed theoretically. ANSYS/LS-DYNA software is used to establish a numerical model for stress monitoring of monitoring points. At the same time, the concrete model is poured, the explosion stress field around the blast hole is measured by means of the high-speed multi-channel dynamic stress testing system, and the monitoring results of the two methods are compared with the theoretical analysis results. The results show that with the increase of the radial decoupling coefficient of blasting, the peak value of explosive stress at the same side point decreases obviously, and with the increase of the distance, the stress attenuation becomes slower. Applying the test results to the blasting of slope, it is found that the blasting effect is the best when the aperture decoupling coefficient is 2.75 and the hole spacing is 1.0 m, and the larger the hole spacing is, the less obvious the blasting crack is, which has certain guiding significance for improving the blasting effect.
    Źródło:
    Mining Science; 2020, 27; 19-38
    2300-9586
    2353-5423
    Pojawia się w:
    Mining Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Camera-based PHM method in rotating machinery equipment micro-action scenarios
    Autorzy:
    Junfeng, An
    Liu, Jiqiang
    Zhen, Hao
    Mengmeng, Lu
    Powiązania:
    https://bibliotekanauki.pl/articles/24200809.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    deep learning
    condition monitoring
    Rmcad
    anomaly detection
    defect early warning
    Opis:
    The health operation of rotating machinery guarantees safety of the project. To ensure a good operating environment, current subway equipment inspections frequency is high, resulting in a waste of resources. Small abnormal changes in mechanical equipment will also contribute to the development of mechanical component defects, which will ultimately lead to the failure of the equipment. Therefore, mechanical equipment defects should be detected and diagnosed as soon as possible. Through the use of graphic processing and deep learning, this paper proposes Rmcad Framework with three aspects: condition monitoring, anomaly detection, defect early warning. Using a network algorithm, this paper proposes an improved model that has the characteristics of two-stream and multi-loss functions, which improves the accuracy of detection. Additionally, a defect warning method is constructed to improve the perception ability of equipment before failure occurs and reduce the frequency of frequent maintenance by detecting anomalies according to the degree of opening.
    Źródło:
    Eksploatacja i Niezawodność; 2023, 25, 1; art. no. 10
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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