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    Wyświetlanie 1-7 z 7
    Tytuł:
    Hydrodynamic forces on a submerged horizontal circular cylinder in uniform finite depth ice covered water
    Autorzy:
    Sahu, M.
    Das, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839795.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    fala powierzchniowa
    elektrodynamika
    dyfrakcja fal
    wave scattering
    hydrodynamic forces
    submerged cylinder
    ice-covered water
    Opis:
    Hydrodynamic forces on a submerged cylinder in uniform finite depth ice-covered water is formulated by using the method of multipoles, the ice-cover being modelled as an elastic plate of very small thickness. The forces (vertical and horizontal) are obtained analytically as well as numerically and depicted graphically for various values of flexural rigidity of the ice-cover to show the effect of its presence. When the flexural rigidity and surface density of the ice-cover are taken to be zero, then the curves for the forces almost coincide with the curves for the case of uniform finite depth water with free surface.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 219-227
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Parametric studies of failure mechanisms in thermal barrier coatings during thermal cycling using FEM
    Autorzy:
    Srivathsa, B.
    Das, D. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/266255.pdf
    Data publikacji:
    2015
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    thermal barrier coatings
    residual stress
    failure mechanisms
    modeling and simulation
    naprężenia szczątkowe
    mechanizm uszkodzenia
    modelowanie
    symulacja
    Opis:
    Thermal barrier coatings (TBCs) are widely used on different hot components of gas turbine engines such as blades and vanes. Although, several mechanisms for the failure of the TBCs have been suggested, it is largely accepted that the durability of these coatings is primarily determined by the residual stresses that are developed during the thermal cycling. In the present study, the residual stress build-up in an electron beam physical vapour deposition (EB-PVD) based TBCs on a coupon during thermal cycling has been studied by varying three parameters such as the cooling rate, TBC thickness and substrate thickness. A two-dimensional thermomechanical generalized plane strain finite element simulations have been performed for thousand cycles. It was observed that these variations change the stress profile significantly and the stress severity factor increases non-linearly. Overall, the predictions of the model agree with reported experimental results and help in predicting the failure mechanisms.
    Źródło:
    International Journal of Applied Mechanics and Engineering; 2015, 20, 4; 899-915
    1734-4492
    2353-9003
    Pojawia się w:
    International Journal of Applied Mechanics and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary results on direct photon-photon HBT measurements in square root sNN = 62.4 GeV and 200 GeV Au+Au collisions at RHIC
    Autorzy:
    Das, D.
    Lin, G.
    Chattopadhyay, S.
    Chikanian, A.
    Finch, E.
    Nayak, T.
    Panitkin, S.
    Sandweiss, J.
    Suaide, A.
    Zhang, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/148364.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    RHIC
    HBT
    interferometry
    TPC
    BEMC
    photon
    Opis:
    We present the preliminary results on direct photon interferometry measurements in Au+Au collisions at square root sNN = 62.4 GeV and 200 GeV using the STAR (solenoidal tracker at RHIC) detector. Photons are reconstructed via e+/e- conversions in STAR Time Projection Chamber (TPC) and energy deposited by photons in STAR Barrel Electromagnetic Calorimeter (BEMC). The two-photon correlations are measured using (1) both photons measured with BEMC; (2) one photon from conversions and the other measured with BEMC. Both the methodologies and the possible constraints in the correlation function measurements are discussed.
    Źródło:
    Nukleonika; 2006, 51,suppl.3; 55-58
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical, experimental and fuzzy logic applications for investigation of crack location and crack depth estimation in a free-free aluminum beam
    Autorzy:
    Behera, S. K.
    Parhi, D. R.
    Das, H. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/127769.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Poznańska. Instytut Mechaniki Stosowanej
    Tematy:
    crack
    natural frequency
    mode shapes
    numerical
    fuzzy
    pęknięcie
    częstotliwość drgań własnych
    kształty modów
    Opis:
    A beam structure under natural vibration in presence of crack undergoes a sharp change in its dynamic characteristics. In the present study the changes in two important modal vibration parameters like mode shapes and natural frequencies have been extensively studied for crack diagnosis in presence and absence of crack. Numerical and experimental investigations have been carried out using an aluminium Free-Free beam structure with and without crack. The crack presence is indicative of a decrease in local flexibility at crack location and a variation in mode shapes and natural frequencies are noticed. These variations in modal parameters have been used as the tools for crack diagnosis. In the present paper, efforts are made to analyse the presence of a crack using the application of fuzzy logic methodology. Here relative natural frequencies preferably first three are derived from experimental and theoretical investigations are utilised as input data to the fuzzy controller with Gaussian membership functions to obtain crack position and crack depth as output data. The resulted output data from fuzzy logic and the result from corresponding experimental and numerical analysis have been compared.The deviation of result of fuzzy logic from numerical and experimental results have been found to be within a limit of 3%.
    Źródło:
    Vibrations in Physical Systems; 2018, 29; 1-20
    0860-6897
    Pojawia się w:
    Vibrations in Physical Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Personality Correlates of Accident-Proneness in Auto-Rickshaw Drivers in India
    Autorzy:
    Manglam, M. K.
    Sinha, V. K.
    Praharaj, S. K.
    Bhattacharjee, D.
    Das, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/89811.pdf
    Data publikacji:
    2013
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    personality
    accident-proneness
    drivers
    16-PF
    kierowcy i maszyniści
    wypadki przy pracy
    Indie
    osobowość
    kierowcy
    Opis:
    Objective. We examined the personality correlates of accident-proneness of auto-rickshaw drivers in the Indian city of Ranchi. Methods. This was a cross-sectional study in which 50 male drivers aged 18-50 years, selected randomly from a list of licensed auto-rickshaw drivers in Ranchi, were assessed with a Hindi version of Cattell's 16 Personality Factors (l6-PF) Questionnaire. Results. There was a significantly higher frequency of breaking rules, crossing speed limits, substance use and a trend towards a higher frequency of carrying extra persons (i.e., more than recommended) in accident-prone drivers. There was significant negative correlation of accident-proneness with 16-PF factors such as reasoning, rule consciousness, apprehension and emotional stability. Conclusion. Personality characteristics with lower scores of reasoning, rule consciousness, apprehension and emotional stability are common in commercial auto-rickshaw drivers with high accident-proneness.
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2013, 19, 2; 159-165
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of organic inputs on strength and stability of soil aggregates under rice-wheat rotation
    Autorzy:
    Das, B.
    Chakraborty, D.
    Singh, V.K.
    Aggarwal, P.
    Singh, R.
    Dwivedi, B.S.
    Powiązania:
    https://bibliotekanauki.pl/articles/25472.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    tensile strength
    stability
    soil aggregate
    rice
    wheat
    cereal crop rotation
    Opis:
    The study aims to elucidate the impact of organic inputs on strength and structural stability of aggregates in a sandy loam soil. Tensile strength, friability and water stability of aggregates, and the carbon contents in bulk soil and in large macro (>2 mm), small macro (0.25-2 mm), micro (0.053-0.25 mm) and silt+clay size (<0.053) aggregates were evaluated in soils from a long-term experiment with rice-wheat rotation at Modipuram, India, with different sources and amounts of organic C inputs as partial substitution of N fertilizer. Addition of organic substrates significantly improved soil organic C contents, but the type and source of inputs had different impacts. Tensile strength of aggregates decreased and friability increased through organic inputs, with a maximum effect under green gram residue (rice)-farmyard manure (wheat) substitution. Higher macroaggregates in the crop residue- and farmyard manure-treated soils resulted in a higher aggregate mean weight diameter, which also had higher soil organic C contents. The bulk soil organic C had a strong relation with the mean weight diameter of aggregates, but the soil organic C content in all aggregate fractions was not necessarily effective for aggregate stability. The soil organic C content in large macroaggregates (2-8 mm) had a significant positive effect on aggregate stability, although a reverse effect was observed for aggregates <0.25 mm. Partial substitution of nitrogen by organic substrates improved aggregate properties and the soil organic C content in bulk soil and aggregate fractions, although the relative effect varied with the source and amount of the organic inputs.
    Źródło:
    International Agrophysics; 2014, 28, 2
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Extended warranty of medical equipment subject to imperfect repairs: an approach based on generalized renewal process and Stackelberg game
    Rozszerzona gwarancja na sprzęt medyczny podlegający niepełnym naprawom: podejście oparte na uogólnionym procesie odnowy i modelu Stackelberga
    Autorzy:
    de Santana, J. M. M.
    Santiago, R. L. V.
    Moura, M das C.
    Lins, I. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/301400.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
    Tematy:
    medical equipment
    extended warranty
    Stackelberg game
    generalized renewal process
    sprzęt medyczny
    rozszerzona gwarancja
    gra Stackelberga
    uogólniony proces odnowy
    Opis:
    Due to its advanced technology, maintenance services of healthcare equipment have been commonly executed by the original equipment manufacturer (OEM), which can be characterized as a monopolist. In this context, hospitals require high availability of their equipment at a reasonable servicing cost, whereas OEM aims to maximize its profit by selling extended warranty (EW) services for multiple consumers. The issue of drawing a maintenance contract between OEM and hospitals has already been treated by adopting a Stackelberg’s game. However, the “as good as new” and “as bad as old” assumptions are usually considered, which are rather difficult to observe in practice, especially for healthcare institutions and their technology-intensive equipment. Thus, we here adopt generalized renewal processes (GRP) for modelling imperfect repairs, and we develop a discrete event simulation method for finding the best strategies of each player: OEM sets the prices for EW and on-demand maintenance that optimize its profit, while hospitals choose which option they should hire. We also present an application example with real data gathered from an angiography device, which is used for mapping blood vessels and diagnosing heart diseases.
    Ze względu na zaawansowanie technologiczne sprzętu medycznego, jego obsługą serwisową zazwyczaj zajmuje się producent sprzętu oryginalnego (OEM), co czyni go monopolistą w tym zakresie. Podczas gdy szpitalom zależy na wysokiej gotowości sprzętu przy rozsądnych kosztach obsługi, OEM dąży do maksymalizacji zysku poprzez sprzedaż rozszerzonej gwarancji na usługi serwisowe wielu klientom. Istnieją już badania, w których kwestię zawierania umowy o świadczenie usług serwisowych między OEM a szpitalami analizowano z zastosowaniem modelu Stackelberga. Jednak zwykle badania te zakładają, że stan po naprawie może być albo "jak fabrycznie nowy" albo"jak przed uszkodzeniem", co rzadko spotyka się w praktyce, zwłaszcza w przypadku placówek służby zdrowia i ich zaawansowanego technologicznie sprzętu. W związku z tym, w przedstawionej pracy, przyjęto uogólniony proces odnowy (GRP) do modelowania niepełnych napraw oraz opracowano metodę symulacji zdarzeń dyskretnych w celu znalezienia najlepszych strategii dla każdego gracza: OEM ustala ceny rozszerzonej gwarancji oraz konserwacji na żądanie, tak by zoptymalizować swój zysk; szpital natomiast ustala, którą opcję powinien wybrać. W pracy przedstawiono również przykład zastosowania omawianego podejścia z wykorzystaniem rzeczywistych danych zebranych z angiografu, który służy do obrazowania naczyń krwionośnych i diagnozowania chorób serca.
    Źródło:
    Eksploatacja i Niezawodność; 2018, 20, 4; 567-578
    1507-2711
    Pojawia się w:
    Eksploatacja i Niezawodność
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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