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Wyszukujesz frazę "dynamics of movement" wg kryterium: Temat

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Estimation of stability of railway flat cars with various types of running gear against derailment
    Autorzy:
    Domin, Rostyslav
    Domin, Yurii
    Cherniak, Ganna
    Powiązania:
    https://bibliotekanauki.pl/articles/215373.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Kolejnictwa
    Tematy:
    containerized transportation
    flat cars
    dynamics of movement
    computer simulation
    safety of high speed traffic
    Opis:
    Issue related to ensuring safety of technical operation of flat cars for high speed containerized transportation by way of using new types of running gear is considered in the paper. Because of principal drawbacks of widely used bogies of freight cars possible use of axle box suspension bogies is considered for the equipment of high speed flat cars. Taking into consideration highly efficient application of mathematic simulation for the determination of dynamic performance of railway cars appropriate computer models were developed for the estimation of the conditions related to ensuring safe motion of flat cars. It was revealed as result of the simulation that in case of stability of wheelsets against derailment condition of safe operation of a flat car equipped with axle box suspension bogies is satisfied at travel speeds up to and including 150 km/h whereas safe travel of a flat car equipped with conventional bogies is ensured at travel speeds up to but 100 km/h. This conclusion gives bases to recommend equipment of flat cars for high speed containerized transportation with axle box suspension running gear.
    Źródło:
    Problemy Kolejnictwa; 2019, 185; 119-124
    0552-2145
    2544-9451
    Pojawia się w:
    Problemy Kolejnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of Railway Vehicles Movement on Transition Curves
    Autorzy:
    Basak, A.
    Nowak, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2023776.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    railway
    transition curve
    dynamics of vehicle movement
    kolej
    krzywa przejściowa
    dynamika ruchu pojazdu
    Opis:
    Transition curves are an integral part of a route. They connect a straight section with a circular curve or two circular curves with different radii. Due to the forced path, the size and stiffness of the rail vehicle, their correct design is particularly important when constructing rail roads. Basing on the limits of lateral acceleration increment, non-equilibrium centripetal acceleration and wheel lift velocity, set in accordance with the model of motion of a material point moving along a trajectory determined by the track axis, the initial parameters of the considered transition curves were selected: radius of the curve, design speed of the train, length of the transition curve and track cant. The scope of research covered basic dynamic parameters: curvature and its increment, speed and acceleration of wheel lift, track twist and lateral acceleration increment. As a result of conducted analysis it can be stated that polynomial curves deserve special attention in the design of railway routes. By appropriate modification of their equation, it is possible to change easily positions of extremes of particular dynamic parameters and thus to adjust their values to terrain conditions, direction of movement and type of rail vehicle.
    Źródło:
    Advances in Science and Technology. Research Journal; 2021, 15, 4; 21-29
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    From Mobilization to Demobilization: Dynamics of Contention in the Austerity-driven Slovenia
    Autorzy:
    Rak, Joanna
    Powiązania:
    https://bibliotekanauki.pl/articles/619776.pdf
    Data publikacji:
    2018
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    demobilization
    dynamics of contention
    collective identity
    protest movement
    contentious repertoire
    Opis:
    The article aims to trace the dynamics of contention in austerity-driven Slovenia, explain why it ended, through the processes of demobilization, despite the protest movement’s initial successes, and verify the explanatory power of Charles Tilly and Sidney Tarrow’s theoretical framework of demobilization. The analysis applies the method of source analysis, conceptual qualitative content analysis, and the conceptual framework of contentious politics. In doing so, it addresses the research problems of the dynamics of contention in Slovenia and why the contention resulted in demobilization. The article argues that after mass mobilization an upward scale shift appeared. The shift moved the contention beyond its local origins in Maribor, touched on the interests and values of new subjects, and involved a shift of venue to sites where the demands might have been met by state institutions. The dynamics of contention was a cycle of active and passive contentious episodes. The movement identity shift and successful recognition of its claims influenced the performances and episode sequence. The processes of demobilization started when people stopped attending protests, organizing particular performances, and implementing innovations to modular performances instead. Demobilization occurred when most of the protesters became discouraged from protest through boredom and a desire to return to everyday routines.
    Źródło:
    Środkowoeuropejskie Studia Polityczne; 2018, 3; 49-64
    1731-7517
    Pojawia się w:
    Środkowoeuropejskie Studia Polityczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Temperature on the Properties of Cellulose Iβ based on Molecular Dynamics Simulations
    Autorzy:
    Huang, Shuang
    Wu, Xin
    Li, Peixing
    Powiązania:
    https://bibliotekanauki.pl/articles/2056296.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    cellulose Iβ
    molecular dynamics simulation
    Mulliken population
    movement of chain
    hydrogen bond
    Opis:
    Natural plants, such as cotton and linen, are rich in cellulose Iβ. The properties of cellulose Iβ under different temperatures was studied using molecular dynamics simulations. Firstly, the crystal of cellulose Iβ was built. To verify the model, the X-ray fibre diffraction and thermal expansion coefficients were calculated, which were found to agree with experimental results. Then the Mulliken population of the bonds were computed and the movement of the centre chain and hydrogen bonds studied over the range 300-550 K using a PCFF force field. The results of the Mulliken population reveal the three steps of pyrolysis. The higher the temperature is, the more intensely the movement of the centre chain is. However, the impact of temperature on the movement of the centre chain is not obvious. From 300 K to 550 K, the total number of hydrogen bonds decreased by only 20%. Moreocer, the rupture of intrachain hydrogen bonds and the formation of interchain hydrogen bonds at 400 K~450 K temperature occurred.
    Źródło:
    Fibres & Textiles in Eastern Europe; 2021, 6 (150); 32--36
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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