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    Wyświetlanie 1-4 z 4
    Tytuł:
    Biomechanics of figure skating jump double axel performed in on ice and off ice conditions
    Biomechanika skoku łyżwiarskiego podwójny axel wykonywanego w warunkach naturalnych i symulacyjnych
    Autorzy:
    Mazurkiewicz, A.
    Iwańska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/956592.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Śląska. Katedra Biomechatroniki
    Tematy:
    figure skating
    Axel
    Axel Paulsen
    off-ice
    on-ice
    jump
    biomechanics
    jazda figurowa na łyżwach
    skok
    biomechanika
    Opis:
    Figure skating is considered a highly technical discipline. Coaches and researchers are constantly looking for the most effective and safest movement model for jumps, especially Axel Paulsen, which is the hardest kind of all jumps. This research was taken to verify the usefulness of performing double Axel under off- ice conditions as a part of general figure skating training. Research was based on video analysis made in APAS 2000 programme. Parameters taken into account were: joints and take off angle, displacement of centre body mass, horizontal and vertical velocity. Results helped in finding out parameters which are trained during off-ice session.
    Źródło:
    Aktualne Problemy Biomechaniki; 2015, 9; 83-88
    1898-763X
    Pojawia się w:
    Aktualne Problemy Biomechaniki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability and safety of ships : holistic and risk approach
    Autorzy:
    Kobyliński, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/2069592.pdf
    Data publikacji:
    2007
    Wydawca:
    Uniwersytet Morski w Gdyni. Polskie Towarzystwo Bezpieczeństwa i Niezawodności
    Tematy:
    maritime safety
    risk analysis
    ship's stability
    ice accretion on ships
    Opis:
    Present stability regulations developed over the years by IMO reached definite conclusion with the adoption of the Revised Draft of the Intact Stability Code. The criteria included there are design criteria of the prescriptive nature, based mainly on statistics of stability casualties. Currently IMO is considering development of criteria based on ship performance. Concept of such criteria is, however, at present not agreed. The criteria are working comparatively well with regard to the majority of conventional ships, however advent of very large and sophisticated ships of non-conventional features caused that those criteria may be inadequate. The author advances the idea consisting of application of safety assessment and risk analysis using holistic and system approach to stability. Safety against capsizing (or LOSA accident) is a complex system where design, operational, environmental and human factors have to be taken into account. Although this seems to be a very complex task, in the opinion of the author it may be manageable and could be applied for safety assessment of highly sophisticated and costly ships.
    Źródło:
    Journal of Polish Safety and Reliability Association; 2007, 2; 211--218
    2084-5316
    Pojawia się w:
    Journal of Polish Safety and Reliability Association
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Migracja środków chemicznych wykorzystywanych do likwidacji oblodzenia nawierzchni drogowych
    Migration of chemicals used to the liquidation icing pavement
    Autorzy:
    Czarna, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/113604.pdf
    Data publikacji:
    2016
    Wydawca:
    STE GROUP
    Tematy:
    nawierzchnie drogowe
    oblodzenie
    środki chemiczne
    road surfaces
    ice on the road
    chemicals
    Opis:
    W ramach zimowego utrzymania dróg służby drogowe usuwają z nawierzchni drogowych śliskość zimową. W Polsce, najczęściej stosowanym topnikiem jest chlorek sodu (NaCl), sól drogowa (97% NaCl + 2,5% CaCl2 + 0,2% K4Fe(CN)6), rzadziej chlorek wapnia (CaCl2) oraz chlorek magnezu (MgCl2). Stosowanie chlorków przyczynia się do powstawania uszkodzeń w nawierzchniach drogowych, korozji oraz do nieodwracalnych zmian w środowisku naturalnym. W artykule wskazano stopień migracji środków chemicznych stosowanych w Polsce w sezonie zimowym (luty 2015 r.) oraz zasięg oddziaływania tych środków dzięki oznaczeniu zasolenia gleb przydrożnych metodą konduktometryczną (październik 2014 r., marzec 2015 r.). Badania przeprowadzono na drodze wojewódzkiej nr 282 (obwodnica Nowego Kisielina) na 24 wydzielonych kwaterach w warstwie oblodzenia o powierzchni 0,5 m2 każda oraz na 6 transektach z 5 punktami pomiarowymi zlokalizowanymi na każdym transekcie w odległości 10, 20, 30, 40 i 50 m od każdej z kwater. Badania jednoznacznie wykazały wysokie zasolenie gleb zlokalizowanych w pasie przydrożnym na którym zastosowano sól drogową, z jednoczesnym wskazaniem najwyższego stopnia migracji tego środka w warstwie śliskości zimowej.
    In winter road maintenance service road remove snow from the road surface and slippery winter In Poland, the most commonly used fluxing agent is sodium chloride (NaCl), road salt (97% NaCl + 2,5% CaCl2 + 0,2% K4Fe(CN)6), less calcium chloride (CaCl2) and magnesium chloride (MgCl2). The use of chemicals to the formation of cracks in road surfaces, corrosion and to irreversible changes in the environment. The article indicates the degree of migration of chemicals used in Poland in the winter (February 2015). And the reach of these measures by the determination of soil salinity using roadside conductivity (October 2014, March 2015). The research was carried out on the road No. 282 (ring road Nowy Kisielin) for 24 separate quarters in a layer of ice on the area of 0.5 m2 each and 6 transects with 5 measuring points localized on each transect 10, 20, 30, 40 and 50 m of each lodging. The study clearly showed high salinity of soils located at the waist roadside where road salt is used, while indicating the highest degree of migration of the measure in a layer of slippery winter.
    Źródło:
    Systemy Wspomagania w Inżynierii Produkcji; 2016, 5 (17); 86-92
    2391-9361
    Pojawia się w:
    Systemy Wspomagania w Inżynierii Produkcji
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Lower Vistula and Its Ice Problems
    Autorzy:
    Majewski, Wojciech
    Powiązania:
    https://bibliotekanauki.pl/articles/2097771.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    Vistula river
    Vistula catchment
    ice formation
    ice problems in rivers
    ice floods on the Vistula
    Opis:
    In many countries of the northern hemisphere during winter period ice forms appear on various water bodies, which results in significant changes of physical, chemical and ecological conditions. These changes are different in rivers, channels, lakes or once-through reservoirs. On the terrain of Poland ice always caused considerable problems affecting intensive inland navigation and other river use. These problems appeared especially on the Vistula River, which in 17th and 18th century was one of the most navigable rivers in Europe. The Vistula is the largest Polish river, which flows from the south in the Carpathian Mountains to the Baltic Sea in the north. It is the second largest river, after Neva, of the Baltic Sea catchment. The length of the Vistula is 1047 km and its catchment amounts to 194 thousand km2. The predominant part of the Vistula river basin (87%) is now on Polish territory and the remaining (13%) catchment is in Belarus, Ukraine and Slovakia. The course of the Vistula can be divided into three distinctly different sections: upper, middle and lower. These river sections have appropriate catchments with their tributaries. There are hydraulic structures on the main river course and on its tributaries which serve navigation, hydroenergy, flood protection, water supply and recreation. All over the Vistula catchment there are frequent floods during spring and summer time resulting from excessive precipitation but in winter caused by ice phenomena. Numerous flow problems appear especially along the lower Vistula course because of ice phenomena and they result very often in severe flood problems. The Vistula has a very variable time and spatial discharge, because of existing climate conditions over its catchment. The aim of the paper is to present hydraulic and hydrologic characteristics of the Lower Vistula river with special emphasis on the management of this river section for navigation, hydroenergy, flood protection and water supply in view of ice phenomena appearing there. Information concerning changes of water characteristics due to various water temperatures are presented as well as on the formation of various forms of ice in flowing water. Numerous ice studies were carried out in Poland and especially on the Lower Vistula section as it was very ice prone and where many ice jams and ice-jam floods occurred. A special hydraulic situation existed at the mouth of the Vistula, which caused important floods in the 18th century and resulted in the construction of a special direct channel to the sea (Przekop Wisły) solving flood problems in this area. Information is presented on changes in open channel flow due to the appearance of ice cover and other ice forms. The paper includes ample information on the run, consequences and studies connected with a very important ice-jam-flood on the upper part of Włocławek reservoir in 1982.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2021, 68, 1; 41--83
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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