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    Wyświetlanie 1-5 z 5
    Tytuł:
    Wizualizacja parametrów anten symulowanych programem NEC-2
    Visualization antenna’s parameters simulated with NEC-2
    Autorzy:
    Chaber, B.
    Starzyński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/408577.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
    Tematy:
    anteny nec2
    charakterystyka promieniowania
    impedancja falowa S11
    antennas nec2
    radiation pattern
    wave impendance
    Opis:
    Artykuł prezentuje informacje dotyczące wizualizacji danych wyjściowych symulacji programem NEC-2. Autorzy opisują własne narzędzia służące do generowania wizualizacji parametrów modelowanych anten takich jak charakterystyka promieniowania, impedancja falowa anteny, parametr S11.
    Article presents information about visualization of data output from NEC-2. Authors describes their own tools used for visualization of antenna's parameters like radiation pattern, wave impedance, S11 parameter.
    Źródło:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2013, 1; 15-18
    2083-0157
    2391-6761
    Pojawia się w:
    Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulations of flow patterns in silos with a cellular automaton: Part 2
    Autorzy:
    Kozicki, J.
    Tejchman, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1965144.pdf
    Data publikacji:
    2005
    Wydawca:
    Politechnika Gdańska
    Tematy:
    cellular automation
    collisions
    density wave
    granular flow
    flow pattern
    silo
    Opis:
    An improved cellular automaton has been used to calculate the kinematics of non-cohesive granular materials during confined flow in mass and funnel flow model silos. In this model, based on a gas model of hydrodynamics, collisions and dissipation of particles were taken into account during granular flow. The model allowed for investigations of dilatant zones in granular material during silo flow.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2005, 9, 1; 103-114
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CFD optimisation of the longitudinal volume distribution of a ship’s hull by constrained transformation of the sectional area curve
    Autorzy:
    Kraskowski, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/32906720.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    parametric optimisation
    CFD
    model tests
    resistance
    wave pattern
    Opis:
    The paper presents a proposal for a formalised approach to hull shape optimisation with respect to total resistance, by fine-tuning longitudinal volume distribution. An algorithm for automated modification of the hull is presented, allowing for varying the sectional area distribution with a negligible influence on the resulting displacement. Computational fluid dynamics (CFD) solver STAR-CCM+ and computer computer-aided design (CAD) software NX were used to search the optimal volume distribution of selected parent shapes, with respect to total resistance. The bow part and the aft part were optimised separately. The resulting resistances of the selected optimal shapes were then verified by means of scale model tests, realised in the towing tank at the Maritime Advanced Research Centre (CTO) S.A. A noticeable gain in total resistance was achieved and confirmed by experimental tests. The proposed approach seems to be a promising method for relatively quick parametric optimisation of the designed hull shapes; it is also applicable for generic CFD optimisation studies.
    Źródło:
    Polish Maritime Research; 2022, 3; 11-20
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spatial patterns of the wave climate in the Baltic Proper and the Gulf of Finland
    Autorzy:
    Soomere, T.
    Raamet, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/47721.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Baltic Sea
    Finland Gulf
    instrumental measurement
    long-term change
    sea wave modelling
    spatial pattern
    temporal variation
    visual observation
    wave climate
    wave measurement
    wind speed
    wind wave
    Opis:
    We make an attempt to consolidate results from a number of recent studies into spatial patterns of temporal variations in Baltic Sea wave properties. The analysis is based on historically measured and visually observed wave data, which are compared with the results of numerical hindcasts using both simple fetch-based one-point models and contemporary spectral wave models forced with different wind data sets. The focus is on the eastern regions of the Baltic Sea and the Gulf of Finland for which long-term wave data sets are available. We demonstrate that a large part of the mismatches between long-term changes to wave properties at selected sites can be explained by the rich spatial patterns in changes to the Baltic Sea wave fields that are not resolved by the existing wave observation network. The spatial scales of such patterns in the open sea vary from >500 km for short-term interannual variations down to about 100 km for long-term changes.
    Źródło:
    Oceanologia; 2011, 53, (1-TI)
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Heat waves in Poland in the period 1951-2015: trends, patterns and driving factors
    Autorzy:
    Wibig, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/108510.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
    Tematy:
    fala upałów
    Polska
    tendencja
    intensywność
    skupienie
    heat wave
    Polska
    trend
    intensity
    blocking index
    circulation pattern
    k-mean clustering
    Opis:
    Heat waves were analysed on the basis of maximum daily temperature from 24 meteorological stations in Poland. Heat waves are defined as the longest continuous period during which Tmax (daily maximum air temperature) is equal to or higher than 30°C in at least three days, the mean Tmax during the whole heat wave is equal or higher than 30°C and Tmax does not drop below 25°C during the whole period of heat wave duration. Heat waves occur in Poland from April to September with their maximums in July and August. Four-day-long heat waves are most frequent but the longest one lasted 31 days. The most persistent heat waves were in 1994 and 2015. An increasing trend in heat wave frequency and intensity is observed in Poland, however the increase is statistically significant at only about 60% of analysed stations. Four synoptic patterns favouring heat waves have been distinguished. A strong high over the Azores accompanies all of them, as well as slightly higher than normal pressure over Central Europe – this causes calm and sunny weather over Poland. Strong blocking appears over the North Atlantic during heat wave events, proofing that the development of strong heat waves in Poland is related to large scale circulation and that they are not of local origin. The analysis of the impact of soil moisture in months leading up to the development of heat waves should be the next step in analysis.
    Źródło:
    Meteorology Hydrology and Water Management. Research and Operational Applications; 2018, 6, 1; 37-45
    2299-3835
    2353-5652
    Pojawia się w:
    Meteorology Hydrology and Water Management. Research and Operational Applications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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