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    Wyświetlanie 1-4 z 4
    Tytuł:
    Reasons for Applying Innovations for Scaffolding Work
    Autorzy:
    Jong, A. M.
    Molen, H. v. d.
    Vink, P.
    Eikhout, S.
    Koningsveld, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/90714.pdf
    Data publikacji:
    2003
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    scaffolding work
    innovations
    participatory ergonomics
    musculoskeletal problems
    construction industry
    choroby narządów ruchu
    prace budowlane
    praca na wysokości
    ergonomia
    praca mięśni
    obciążenie fizyczne
    Opis:
    In this paper reasons for applying and for not applying technical and organizational innovations in scaffolding work are studied. In a participatory ergonomic approach these innovations were developed to reduce problems concerning physical load of scaffolders. In this study reasons for the adoption of the innovations in the scaffolding sector are evaluated in 2 studies, in 48 companies. More than half of the scaffolding sector in the Netherlands adopted the innovations. Reasons for applying innovations concerned improvement of work and health and satisfaction with usage. The reason for not applying the innovations concerned specific situations, such as offshore work, in which innovations were not applicable.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2003, 9, 2; 161-175
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Selection mining methods via multiple criteria decision analysis using TOPSIS and modification of the UBC method
    Autorzy:
    Ali, Mahrous A.M.
    Kim, Jong-Gwan
    Powiązania:
    https://bibliotekanauki.pl/articles/1839056.pdf
    Data publikacji:
    2021
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    TOPSIS
    UBC method
    mining method selection
    multiple criteria decision making
    metoda UBC
    wybór metod wydobycia
    wielokryterialne podejmowanie decyzji
    Opis:
    Mine designers often face difficulties in selecting an appropriate mining method; however, such a method should be selected based on ore and rock characteristics. The selection of mining methods can be considered a type of multi-criteria decision making, and this depends on many factors used in the selection process. The general method used in this field is the University of British Columbia (UBC) method, which determines the criteria of the properties that are compared to determine the best and worst of several mining methods. In this paper we used as new technique which defines as Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS). The criteria considered in the UBC method include general shape, ore thickness, ore plunge, and grade distribution, beside the rock quality designation (RQD), and the rock substance strength (RSS). This paper presents an improved TOPSIS method based on experimental design. Additionally, this paper will introduce a modified version of the UBC method that can be employed based on Excel sheet. The best mining methods is cut and fill stoping and top slicing with the same rank equal 0.72, and the second-best mining method is square set stoping with rank equal 0.65.
    Źródło:
    Journal of Sustainable Mining; 2021, 20, 2; 49-55
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of an eccentric decoupled charge on rock mass blasting
    Autorzy:
    Kim, Jung-Gyu
    Ali, Mahrous A.M.
    Kim, Jong-Gwan
    Powiązania:
    https://bibliotekanauki.pl/articles/1839045.pdf
    Data publikacji:
    2020
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    eccentric decoupled charge
    fracture pattern
    PFC
    AUTODYN
    decoupling index
    wzór pęknięcia
    wskaźnik odsprzęgania
    Opis:
    Experimental and numerical analyses were conducted to investigate the effect of an eccentric loaded contour hole on a rock mass. In the concrete blocks used for the analyses, detonating cords were placed at the centre of the blast hole and eccentrically against the wall of the blast hole. PFC2D and AUTODYN were used for the numerical analyses, and the results of these software showed that an eccentric decoupled charge can result in the directional development of fractures, thereby enabling the control of cracks in the opposite direction. Even though both types of blasting have identical decoupling indexes, the crack and fracture patterns were affected by the location of the explosive, tamping, and other conditions. The results showed that an eccentric charge holder can be applicable to control the fracture direction and the damaged zone. For an eccentric charge, the initial crack was generated at 0.01 ms and expanded in the intended direction. For the eccentric charge, the maximum pressure at the area in contact with the blast hole wall exceeded that for the central decoupled charge by a factor of 5.5. Furthermore, the pressure in the intended direction was twice of that in the opposite direction.
    Źródło:
    Journal of Sustainable Mining; 2020, 19, 1; 1-10
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Airborne virus sampling-efficiencies of samplers and their detection limits for infectious bursal disease virus (IBDV)
    Autorzy:
    Zhao, Y.
    Aarmink, A.J.A.
    Wang, W.
    Fabri, T.
    Groot Koerkamp, P.W.
    de Jong, M.C.M.
    Powiązania:
    https://bibliotekanauki.pl/articles/51080.pdf
    Data publikacji:
    2014
    Wydawca:
    Instytut Medycyny Wsi
    Opis:
    Introduction. The airborne transmission of infectious diseases in livestock production is increasingly receiving research attention. Reliable techniques of air sampling are crucial to underpin the findings of such studies. This study evaluated the physical and biological efficiencies and detection limits of four samplers (Andersen 6-stage impactor, all-glass impinger “AGI-30”, OMNI-3000 and MD8 with gelatin filter) for collecting aerosols of infectious bursal disease virus (IBDV). Materials and Method. IBDV aerosols mixed with a physical tracer (uranine) were generated in an isolator, and then collected by the bioaerosol samplers. Samplers’ physical and biological efficiencies were derived based on the tracer concentration and the virus/tracer ratio, respectively. Detection limits for the samplers were estimated with the obtained efficiency data. Results. Physical efficiencies of the AGI-30 (96%) and the MD8 (100%) were significantly higher than that of the OMNI-3000 (60%). Biological efficiency of the OMNI-3000 (23%) was significantly lower than 100% (P < 0.01), indicating inactivation of airborne virus during sampling. The AGI-30, the Andersen impactor and the MD8 did not significantly inactivate virus during sampling. The 2-min detection limits of the samplers on airborne IBDV were 4.1 log10 50% egg infective dose (EID50) m-3 for the Andersen impactor, 3.3 log10 EID50 m-3 for the AGI-30, 2.5 log10 EID50 m-3 for the OMNI-3000, and 2.9 log10 EID50 m-3 for the MD8. The mean half-life of IBDV aerosolized at 20 °C and 70% was 11.9 min. Conclusion. Efficiencies of different samplers vary. Despite its relatively low sampling efficiency, the OMNI-3000 is suitable for use in environments with low viral concentrations because its high flow rate gives a low detection limit. With the 4 samplers investigated, negative air samples cannot guarantee virus-free aerial environments, which means that transmission of infectious agents between farms may still occur even when no virus has been detected.
    Źródło:
    Annals of Agricultural and Environmental Medicine; 2014, 21, 3
    1232-1966
    Pojawia się w:
    Annals of Agricultural and Environmental Medicine
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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