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    Wyświetlanie 1-5 z 5
    Tytuł:
    Generalized control with compact support for systems with distributed parameters
    Autorzy:
    Khurshudyan, A. Zh.
    Powiązania:
    https://bibliotekanauki.pl/articles/229167.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    distributed system
    controls with compact support
    problem of moments
    L1
    L2 and L∞-optimal controls
    Opis:
    We propose a generalization of the Butkovskiy’s method of control with compact support [1] allowing to derive exact controllability conditions and construct explicit solutions in control problems for systems with distributed parameters. The idea is the introduction of a new state function which is supported in considered bounded time interval and coincides with the original one therein. By means of techniques of the distributions theory the problem is reduced to an interpolation problem for Fourier image of unknown function or to corresponding system of integral equalities. Treating it as infinite dimensional problem of moments, its L1, L2 and L∞-optimal solutions are constructed explicitly. The technique is explained for semilinear wave equation with distributed and boundary controls. Particular cases are discussed.
    Źródło:
    Archives of Control Sciences; 2015, 25, 1; 5-20
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Homogeneous regionalization via L-moments for Mumbai City, India
    Autorzy:
    Parchure, Amit Sharad
    Gedam, Shirish Kumar
    Powiązania:
    https://bibliotekanauki.pl/articles/108584.pdf
    Data publikacji:
    2019
    Wydawca:
    Instytut Meteorologii i Gospodarki Wodnej - Państwowy Instytut Badawczy
    Tematy:
    regional analysis
    L-moments
    tests for homogeneity
    K-means clustering
    principal components analysis
    Opis:
    This study identified homogeneous rainfall regions using a combination of cluster analysis and the L-moments approach. The L-moments of heavy rainfall events of various durations (0.25, 1, 6, 12, 24, 48, 72, 96, and 120 h) were analysed using seasonal (June-September) rainfall measurements at 47 meteorological stations over the period 2006- 2016. In the primary phase of this study, the homogeneity of Mumbai as a single region was examined by statistical testing (based on L-moment ratios and variations of the L-moments). The K-means clustering approach was applied to the site characteristics to identify candidate regions. Based on the most appropriate distribution, these regions were subsequently tested using at-site statistics to form the final homogeneous regions. For durations above 1h, the regionalisation procedure delineated six clusters of similarly behaved rain gauges, where each cluster represented one separate class of variables for the rain gauges. However, for durations below 1h, the regionalisation procedure was not efficient in the sense of identifying homogeneous regions for rainfall. Furthermore, the final clusters confirmed that the spatial variation of rainfall was related to the complex topography, which comprised flatlands (below or at mean sea level), urban areas with high rise buildings, and mountainous and hilly areas.
    Źródło:
    Meteorology Hydrology and Water Management. Research and Operational Applications; 2019, 7, 2; 73-83
    2299-3835
    2353-5652
    Pojawia się w:
    Meteorology Hydrology and Water Management. Research and Operational Applications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Regional frequency analysis of extreme precipitation in northeastern Algeria
    Analiza częstotliwości ekstremalnych opadów w regionie północno-wschodniej Algierii
    Autorzy:
    Dad, S.
    Benabdesselam, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/293064.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    extreme daily precipitation
    GEV distribution
    homogeneous regions
    L-moments
    regional frequency analysis
    analiza regionalnej częstotliwości
    ekstremalne opady dobowe
    momenty L
    regiony homogeniczne
    rozkład GEV
    Opis:
    The aim of the study is to improve the quality of estimating of the annual maximum daily precipitations of the northeastern area of Algeria. The regional frequency analysis based on L-moments was used. The investigated area is represented by 58 measuring stations. The main stages of the study were the definition of homogeneous regions and the identification of the regional distribution. It has been defined that the study region is homogeneous in terms of L-moments ratios despite the climatic differences within the region. Among the different tested distributions; the generalised extreme value (GEV) distribution has been identified as the most appropriate regional distribution for modelling precipitation in the region. The growth curve, derived from the regional distribution, was established. Therefore, to estimate the different return period’s precipitation quantiles in a given site of the region, the mean precipitation of the site has to be multiplied by the corresponding regional quantile (growth factor). Comparison of the quantiles estimated from the regional and at-site frequency analysis showed that in the majority of stations (82.8%) at-site model underestimates the quantiles having high return periods.
    Celem pracy była poprawa jakości ocen maksymalnego w ciągu roku dobowego opadu na obszarze północno-wschodniej Algierii. Wykorzystano statystykę L-momentów do analizy częstotliwości regionalnej. Badany obszar jest reprezentowany przez 58 stacji pomiarowych. Głównymi etapami badania było zdefiniowanie regionów homogenicznych i identyfikacja rozkładu regionalnego. Stwierdzono, że badany region jest homogeniczny w znaczeniu proporcji momentów L, mimo różnic klimatycznych w obrębie regionu. Spośród testowanych rozkładów najbardziej odpowiedni do modelowania opadu w regionie okazał się uogólniony rozkład wartości ekstremalnych (GEV). Ustalono krzywą wzrostu wyprowadzoną z rozkładu regionalnego. Aby oszacować kwantyle okresów powtarzalności opadów dla danego stanowiska w regionie, średni opad w tym stanowisku należy pomnożyć przez odpowiedni kwantyl regionalny (czynnik wzrostu). Porównanie analizy częstotliwości w odniesieniu do regionu i stanowiska wykazało, że w większości stacji (82,8%) model stanowiskowy obniża wyniki oszacowania kwantyli o długim okresie powtarzalności.
    Źródło:
    Journal of Water and Land Development; 2018, 39; 27-37
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The reactivation of Warsaw oxbow lakes as a leitmotiv of urban design
    Autorzy:
    Solarek, Krystyna
    Powiązania:
    https://bibliotekanauki.pl/articles/292354.pdf
    Data publikacji:
    2020
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Tematy:
    extreme daily precipitation
    GEV distribution
    homogeneous regions
    L-moments
    regional frequency analysis
    Opis:
    Oxbow lakes occurring in floodplains are those natural elements that are subject to rapid changes, which may lead to their disappearance. These are extremely valuable ecosystems and landscape components, as well as water management units. However, they quickly disappear if they are not periodically fed with river water, which takes place especially when rivers are embanked. Such a situation occurs, among others in Warsaw, in the Vistula valley. There are many opportunities for the reactivation of oxbow lakes, including through technical activities. It is not always possible to restore the natural values of the valley in urbanized areas, however, oxbow lakes can then also play a recreational role and they can fulfill an important task in improving the quality of life, being also an important element of the public space system. The author has carried out research related to land development projects of the new district located in the Vistula River valley in Warsaw (the Siekierkowski Arc). Many different design solutions have been proposed, taking as a leitmotiv the restoration of oxbow lakes, for example: (1) reconstruction of the water channel in the former watercourse with the boulevard along its fragment and with the public park in another part, (2) water supplying of the existing oxbow lake through the green and blue infrastructure system. The author presents few urban designs carried out under her direction for this area and shows that creative reactivation of oxbow lakes can improve water conditions, and be beneficial for the introduction of a new, attractive development.
    Źródło:
    Journal of Water and Land Development; 2020, 45; 165-170
    1429-7426
    2083-4535
    Pojawia się w:
    Journal of Water and Land Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Topology optimization for elastic base under rectangular plate subjected to moving load
    Autorzy:
    Jilavyan, S. H.
    Khurshudyan, A. Zh.
    Powiązania:
    https://bibliotekanauki.pl/articles/230086.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    distributed system
    moving load
    Kirchhoff plate
    Winkler base
    topology optimization
    problem of moments
    L∞-optimal control
    distributions
    Bubnov–Galerkin procedure
    Opis:
    Distribution optimization of elastic material under elastic isotropic rectangular thin plate subjected to concentrated moving load is investigated in the present paper. The aim of optimization is to damp its vibrations in finite (fixed) time. Accepting Kirchhoff hypothesis with respect to the plate and Winkler hypothesis with respect to the base, the mathematical model of the problem is constructed as two–dimensional bilinear equation, i.e. linear in state and control function. The maximal quantity of the base material is taken as optimality criterion to be minimized. The Fourier distributional transform and the Bubnov–Galerkin procedures are used to reduce the problem to integral equality type constraints. The explicit solution in terms of two–dimensional Heaviside‘s function is obtained, describing piecewise–continuous distribution of the material. The determination of the switching points is reduced to a problem of nonlinear programming. Data from numerical analysis are presented.
    Źródło:
    Archives of Control Sciences; 2015, 25, 3; 289-305
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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