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    Wyświetlanie 1-3 z 3
    Tytuł:
    Mechanical and Microstructural Response of Near Beta Ti Alloys to Hot Tensile Testing
    Autorzy:
    Abbasi, S. M.
    Momeni, A.
    Daraee, M.
    Akhondzadeh, A.
    Mirsaeed, S. G.
    Powiązania:
    https://bibliotekanauki.pl/articles/351391.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermomechanical processing
    hot deformation
    dynamic softening
    yield-point phenomena
    hot ductility
    Opis:
    Hot tensile tests were carried out on Timetal-125 and Timetal-LCB near beta Ti alloys at temperatures in range of 600-1000°C and constant strain rate of 0.1 s-1. At temperatures below 700-800°C, the homogenuous and total strains for Timetal-LCB were greater than those for Timetal-125. In contrast, at temperatures over 800°C, Timetal-125 showed better hot ductility. The yield point phenomena was observed in Timetal-LCB at all temperatures. Unlikely, for Timetal-125, it was observed only at temperatures over 800°C. The weaker yield point phenomena in Timetal-125 could be attributed to the negative effect of Al on the diffusion of V. At all temperatures Timetal-LCB exhibited higher strength than Timetal-125. It was found that there should be a direct relationship between the extent of yield point phenomena and strength and dynamic softening through hot tensile testing. It was observed that at temperatures beyond 800°C (beta phase field in both alloys) dynamic recrystallization can progress more in Timetal-125 than in Timetal-LCB. These results were in good agreement with the better hot ductility of Timetal-125 at high temperatures. At low temperatures, i.e. below 700-800°C, partial dynamic recrystallization occurs in beta and dynamic globularization in alpha phase. These processes progress more in Timetal-LCB than in Timetal-125.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 815-823
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Direct observation of rerouting phenomena in traffic networks
    Autorzy:
    Kucharski, R.
    Gentile, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/223498.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dynamic traffic assignment
    rerouting phenomena
    route choice models
    information comply model
    dynamiczna alokacja ruchu
    przekierowania
    modele wyboru drogi
    wybór trasy
    Opis:
    In this paper we propose how available dataset can be used to estimate rerouting phenomena in traffic networks. We show how to look at set of paths observed during unexpected events to understand the rerouting phenomena. We use the information comply model [1] and propose its estimation method. We propose the likelihood formula and show how the theoretical and observed rerouting probabilities can be obtained. We conclude with illustrative example showing how a single observed path can be processes and what information it provides. Contrary to parallel paper [2] where rerouting phenomena is estimated using real traffic flow measures from Warsaw, here we use only synthetic data. The paper is organized as follows. First we elaborate on rerouting phenomena and define the traffic network, then we summarize the literature behind rerouting phenomena. We follow with a synthetic definition of dynamic traffic assignment needed to introduce ICM model in subsequent section. Based on that introduction we define the observations and propose estimation method based on them followed by illustrative example. Paper is summarized with conclusions and pointing of future directions.
    Źródło:
    Archives of Transport; 2014, 30, 2; 57-66
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Indirect observation of rerouting phenomena in traffic networks – case study of Warsaw bridges
    Autorzy:
    Kucharski, R.
    Gentile, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/224147.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    traffic events
    dynamic traffic
    transportation network
    rerouting phenomena
    traffic management
    real-time traffic
    zdarzenia drogowe
    ruch dynamiczny
    sieć transportowa
    przekierowania
    zarządzanie ruchem
    Opis:
    In this paper we propose estimation procedure in which traffic flows resulting from rerouting model are matched with traffic flows observed during unexpected events. We show practical value of observing a entire cut-set of the transportation network and propose theoretical closed-form formulation of estimation problem for the rerouting model. We apply proposed framework on field-data from Warsaw bridges to observe rerouting phenomena. Most importantly we observed that: a) around 20% of affected traffic flow reroutes, b) rerouting flows are increasing in time, c) drivers show strategic capabilities, d) and maximize their utility while rerouting. All of the which were hypothesized in Information Comply Model (Kucharski et. al., 2014) and are now supported with field observations.
    Źródło:
    Archives of Transport; 2014, 32, 4; 29-41
    0866-9546
    2300-8830
    Pojawia się w:
    Archives of Transport
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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