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    Wyświetlanie 1-14 z 14
    Tytuł:
    Ship seakeeping in UKC determination – a further study on wave force transfer functions
    Autorzy:
    Artyszuk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/359064.pdf
    Data publikacji:
    2012
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    ship seakeeping
    ocean wave
    shallow water
    motion dynamics
    Opis:
    Modeling of ship motions in waves concentrates in most applications on the response amplitude operator (RAO). This mathematically not demanding method of analysis is very attractive, but loses some essential information in certain situations. The objective of present contribution is to establish and investigate preliminary foundations for a seakeeping model as optimal for under keel clearance (UKC) estimation. A special attention was devoted to transients of motions, stationary harmonic motions, coupling between degrees of freedom, and the wave force transfer functions – all in the aspect of shallow water environment.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2012, 32 (104) z. 2; 5-15
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Data mining models to predict ocean wave energy flux in the absence of wave records
    Autorzy:
    Mahmoodi, K.
    Ghassemi, H.
    Nowruzi, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/135663.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    ocean wave energy
    meteorological parameters
    GEP
    LDBOD
    DMM
    modeling
    Opis:
    Ocean wave energy is known as a renewable energy resource with high power potential and without negative environmental impacts. Wave energy has a direct relationship with the ocean’s meteorological parameters. The aim of the current study is to investigate the dependency between ocean wave energy flux and meteorological parameters by using data mining methods (DMMs). For this purpose, a feed-forward neural network (FFNN), a cascade-forward neural network (CFNN), and gene expression programming (GEP) are implemented as different DMMs. The modeling is based on historical meteorological and wave data taken from the National Data Buoy Center (NDBC). In all models, wind speed, air temperature, and sea temperature are input parameters. In addition, the output is the wave energy flux which is obtained from the classical wave energy flux equation. It is notable that, initially, outliers in the data sets were removed by the local distribution based outlier detector (LDBOD) method to obtain the best and most accurate results. To evaluate the performance and accuracy of the proposed models, two statistical measures, root mean square error (RMSE) and regression coefficient (R), were used. From the results obtained, it was found that, in general, the FFNN and CFNN models gave a more accurate prediction of wave energy from meteorological parameters in the absence of wave records than the GEP method.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 49 (121); 119-129
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Outlier detection in ocean wave measurements by using unsupervised data mining methods
    Autorzy:
    Mahmoodi, K.
    Ghassemi, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/260330.pdf
    Data publikacji:
    2018
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    ocean wave data
    data mining
    outlier detection
    data correction
    Opis:
    Outliers are considerably inconsistent and exceptional objects in the data set that do not adapt to expected normal condition. An outlier in wave measurements may be due to experimental and configuration errors, technical defects in equipment, variability in the measurement conditions, rare or unknown conditions such as tsunami, windstorm and etc. To improve the accuracy and reliability of an built ocean wave model, or to extract important and valuable information from collected wave data, detecting of outlying observations in wave measurements is very important. In this study, three typical outlier detection algorithms:Box-plot (BP), Local Distance-based Outlier Factor (LDOF), and Local Outlier Factor (LOF) methods are used to detect outliers in significant wave height (Hs) records. The historical wave data are taken from National Data Buoy Center (NDBC). Finally, those data points are considered as outlier identified by at least two methods which are presented and discussed. Then, Hs prediction has been modelled with and without the presence of outliers by using Regression trees (RTs).
    Źródło:
    Polish Maritime Research; 2018, 1; 44-50
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Marine parameters from radar satellite data
    Autorzy:
    Lehner, S.
    Schulz-Stellenfleth, J.
    Horstmann, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/241032.pdf
    Data publikacji:
    2001
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    marine parameters
    radar satellite data
    oceanographic data
    wind
    ocean wave fields
    Opis:
    In 2001 the European Space Agency ESA will launch the earth observation satellite ENVISAT. It will carry several instruments that provide new opportunities to measure oceanographic variabIes. These are the Advanced Synthetic Aperture Radar (ASAR), the Radar Altimeter (RA), the Medium Resolution Imaging Spectrometer (MERIS) and the Advanced Along-Track Scanning Radiometer (AATSR). Together, they rep-resent the main measurement techniques of satellite oceanography, and complement each other perfectly. These instruments are to be used in synergy to: ź improve the analysis of measured wind and ocean wave fields, and thereby improve weather forecasting at weather centers; ź determine the extent and variables of sea ice and develop a five-day sea ice prediction model, to support maritime shipping and offshore activities; ź monitor map sediment and suspended matter transport in coastal regions, especially in areas with large river estuaries, which greatly affects shipping lanes, harbours, and dredging activities; ź monitor hydrobiological and bio-geochemical variables related to water quality in coastal regions and large inland waters, which affects ecology, coastal development, aquaculture, drinking water supplies, and tourism. To prepare the oceanographic community to make best use of the ENVISAT sensors in the pre-Iaunch phase, existing algorithms to derive marine parameters are used and validated using data from the ERS SAR, the ERS RA, Sea WiFS, and IRS MOS sensors now in operation. Derived products, which include wind field, sea state, sea level, sea surface temperature and concentrations of water constituents, are used to address problems that can be tackled best using the synergy of radar and optical data, such as the effect of surface slicks on radar wind measurements, sea state on ocean color, wind and waves on the resuspension of suspended matter, and wind and waves on sea ice variabIes.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2001, 48, 2; 17-29
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of master’s route selection criteria of vehicle carriers in North Pacific and North Atlantic using satellite AIS and Ocean wave data
    Autorzy:
    Fujii, M.
    Hashimoto, H.
    Taniguchi, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/116274.pdf
    Data publikacji:
    2020
    Wydawca:
    Uniwersytet Morski w Gdyni. Wydział Nawigacyjny
    Tematy:
    AIS Assisted Services
    Route Selection
    Route Selection Criteria
    Satellite AIS
    Ocean Wave Data
    Automatic Identification System (AIS)
    North Pacific
    North Atlantic
    Opis:
    The operational measures in which a ship needs to avoid specified areas to escape ship stability failures were discussed at the International Maritime Organization as a part of the second generation intact stability criteria. It is necessary that the rationality and practicality of the operational measures are carefully investigated. In this study, master’s route decision-making criteria of trans-ocean vehicle carriers have been clarified by comparing the Pacific and the Atlantic data, derived from Satellite AIS and ocean wave data. Features of voyage routes of each ocean were discussed, followed by analysis of the encountered wave direction and height during a voyage. The master’s route selection criteria were defined by comparing the probability densities of the wave heights that occurred in the navigable area and that of the actual encountered waves. The navigation hours in a stormy area were also studied.
    Źródło:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation; 2020, 14, 1; 137-141
    2083-6473
    2083-6481
    Pojawia się w:
    TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    On the geometry of ocean surface waves
    Autorzy:
    Massel, S.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/48766.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    air-sea interaction
    atmosphere-ocean interaction
    deep water
    dynamic factor
    geometry
    irregular wave
    marine environment
    ocean surface
    regular wave
    shallow water
    surface wave
    water motion
    wave breaking
    wave slope
    Opis:
    The factors influencing the atmosphere-ocean transfer of mass and momentum, as well as incipient wave breaking and the amount of energy dissipated due to breaking, are discussed in detail. In particular, the influence of directional spreading on the statistics of surface wave slopes and the area of the wind- roughened ocean surface is demonstrated. Theoretical analysis and comparison with the available experimental data show that unimodal directional spreading is not able to reproduce the observed ratio of the cross-wind/up-wind mean square slopes. Better agreement is achieved when bimodal directional spreading, consisting of two wrapped-Gaussian distributions, is applied. The bimodal form suggested by Ewans (1998) is used in the paper. Moreover, the formulae developed here show that the increase in the area due to surface waves is rather small for both regular and irregular waves.
    Źródło:
    Oceanologia; 2011, 53, 2
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical modeling of tsunami wave destruction and turbulent mixing at tsunami wave clash on the shore
    Autorzy:
    Kshevetskii, S.
    Vereshchagina, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1938595.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Gdańska
    Tematy:
    tsunami
    stratified fluid
    internal wave
    numerical modeling
    wave breakdown
    mixing
    turbulence
    ocean
    Opis:
    A numerical model of propagation of internal gravity waves in a stratified medium is applied to the problem of tsunami wave run-up onto a shore. In the model, the ocean and the atmosphere are considered as a united continuum in which the density varies with height with a saltus at the water-air interface. The problem solution is sought as a generalized (weak) solution; such a mathematical approach automatically ensures correct conditions of matching of the solutions used on a water-air interlayer. The density stratification in the ocean and in the atmosphere is supposed to be described with an exponential function, but in the ocean a scale of the density stratification takes a large value and the density changes slightly. The initial wave running to a shore is taken in the form of a long solitary wave. The wave evolution is simulated with consideration of the time-varying vertical wave structure. Near the shore, the wave breaks down, and intensive turbulent mixing develops in the water thickness. The wave breakdown effect depends on the bottom shape. In the case when the bottom slope is small and the inshore depth grows slowly with the distance from the shore, mixing happens only in the upper stratum of the fluid due to the formation of a quiet region near the bottom. When the bottom slope takes a sufficiently large value, the depth where fluid mixing takes place goes down up to 50 meters. The developed model shows that the depth of the mixing effects strongly depends on the bottom shape, and the model may be useful for investigation of the impact strong gales and hurricanes on the coastline and beaches.
    Źródło:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2016, 20, 2; 157-169
    1428-6394
    Pojawia się w:
    TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modelling of seafloor multiples observed in OBS data from the North Atlantic - new seismic tool for oceanography?
    Autorzy:
    Grad, Marek
    Mjelde, Rolf
    Czuba, Wojciech
    Guterch, Aleksander
    Schweitzer, Johannes
    Ipy Project Group, -
    Powiązania:
    https://bibliotekanauki.pl/articles/2051512.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Arctic
    Atlantic Ocean
    controlled source seismology
    ocean bottom seis−mometers
    wave propagation
    seafloor multiples
    Źródło:
    Polish Polar Research; 2011, 4; 375-392
    0138-0338
    2081-8262
    Pojawia się w:
    Polish Polar Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Surface waves in deep and shallow waters
    Autorzy:
    Massel, S.R.
    Powiązania:
    https://bibliotekanauki.pl/articles/48826.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    surface wave
    deep
    shallow water
    dynamic factor
    marine environment
    atmosphere-ocean interaction
    ocean form
    air-sea interface
    hydrodynamics
    Opis:
    The motion of water due to surface waves is the most dynamic factor observed in the marine environment. In this review various aspects of the wave modelling of non-linear, steep surface waves and their role in the atmosphere-ocean interaction are discussed. Significant improvements in wave forecasting have been made in the last ten years. This is to a large extent related to substantial progress in the description of wind forcing and other processes, as well as to the more efficient use of satellite observations and assimilation methods. One striking observation is the increasing variety and complexity of models in which more physical processes are implemented, greater precision and resolution achieved and extended ranges of applicability demonstrated. However, in order to evaluate the applicability of particular models, comparison with high quality experimental data, collected in nature or under laboratory conditions, is necessary.
    Źródło:
    Oceanologia; 2010, 52, 1; 5-52
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mathematical model for predicting the ship speed in the actual weather conditions on the planned ocean route
    Autorzy:
    Szelangiewicz, Tadeusz
    Żelazny, Katarzyna
    Powiązania:
    https://bibliotekanauki.pl/articles/27315862.pdf
    Data publikacji:
    2018
    Wydawca:
    STE GROUP
    Tematy:
    ocean route
    ship speed
    wind
    current
    wave
    ship propulsion
    trasa oceaniczna
    prędkość statku
    wiatr
    prąd
    fale
    siłownie okrętowe
    Opis:
    While operating the ship, one of the most important tasks is forecasting the ocean route. The vessel's speed characteristics are used to predict the route. Commonly used are very simplified algorithms for calculating those characteristics in which only a few basic ship parameters are used. The article presents a more detailed mathematical model for forecasting the speed of the ship in real weather conditions. This model requires more detailed geometric data of the ship and its propulsion (propeller and propulsion engine), but this data is available for operating ships.
    Źródło:
    New Trends in Production Engineering; 2018, 1, 1; 105-112
    2545-2843
    Pojawia się w:
    New Trends in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A model-measurements comparison of atmospheric forcing and surface fluxes of the Baltic Sea
    Autorzy:
    Rudolph, C.
    Lehmann, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/48268.pdf
    Data publikacji:
    2006
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    coupled sea-ice-ocean model
    surface flux
    temperature
    pressure
    radiation flux
    heat flux
    air-sea interaction
    Baltic Sea
    wave radiation
    Opis:
    Observed basic meteorological quantities, heat and radiation fluxes from three different measurement stations in the Baltic Sea are compared with model data of the coupled sea-ice-ocean model BSIOM in order to evaluate the atmospheric forcing, corresponding surface fluxes and the sea surface response. Observational data weremade available from the BASIS winter campaigns in 1998 and 2001 as well as from the r/v ‘Alkor’ cruise in June 2001. Simulated fluxes were calculated from prescribed atmospheric forcing provided from the SMHI meteorological database and modelled sea surface temperatures. The comparison of these fluxes with observations demonstrates a strong correlation, even though mean differences in sensible heat fluxes range from 4 to 12 W m−2 in winter and −25 W m−2 in the June experiment. Differences in latent heat fluxes range from −10 to 23 W m−2. The short-wave radiation flux used as model forcing is on average 15 W m−2 less than the corresponding observations for the winter experiments and 40 W m−2 for the June experiment. Differences in net long-wave radiation fluxes range from −5 to 12W m−2 in winter and −62W m−2 for the June experiment. The correspondence between measured and calculated momentum fluxes is very high, which confirms the usability of our model component for calculating surface winds and wind stresses from the atmospheric surface pressure.
    Źródło:
    Oceanologia; 2006, 48, 3
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Signal generation and verification process for the physical modeling of ocean waves
    Proces generowania i weryfikacji sygnałów na potrzeby fizycznego modelowania fal oceanicznych
    Autorzy:
    Gatz, M.
    Sudański, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/223291.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Marynarki Wojennej. Wydział Dowodzenia i Operacji Morskich
    Tematy:
    ocean waves design
    wave generation
    laboratory flumes
    experimental methods
    signal processing
    projektowanie fal oceanicznych
    generowanie fal
    korytarze laboratoryjne
    metody eksperymentalne
    przetwarzanie sygnałów
    Opis:
    This paper presents the implementation process of the design methodology for ocean waves in a laboratory tank using a wave generator, which is the basis for conducting hydrodynamic model scale research involving real sea conditions. The main focus is placed on generation of time sequences used as the control input for the wave generator and experimental verification methods for the generated waves and concluding with the results and validation of the developed process by achieving wave parameters sufficiently aligned with the theoretical model.
    W artykule przedstawiono proces implementacji metodologii projektowania fal oceanicznych w basenie modelowym przy wykorzystaniu generatora fal, który stanowi podstawę do hydrodynamicznych badań modelowych uwzględniających rzeczywiste warunki oceaniczne. Główny nacisk położono na generowanie przebiegów czasowych i ich wykorzystanie jako wejściowych sygnałów sterujących dla generatora fal oraz metody eksperymentalnej weryfikacji wygenerowanych w ten sposób fal. Przedstawiono także wyniki końcowe i walidację opracowanego procesu, uzyskując parametry fali odpowiednio dopasowane do modelu teoretycznego.
    Źródło:
    Zeszyty Naukowe Akademii Marynarki Wojennej; 2017, R. 58 nr 3 (210), 3 (210); 43-53
    0860-889X
    Pojawia się w:
    Zeszyty Naukowe Akademii Marynarki Wojennej
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wybory parlamentarne w Indiach w 2014 r. – znaczenie dla polityki wewnętrznej i zagranicznej
    Parliamentary Elections in India in 2014: Implications for the Domestic and Foreign Policy
    Autorzy:
    Zajączkowski, Jakub
    Powiązania:
    https://bibliotekanauki.pl/articles/2091811.pdf
    Data publikacji:
    2020-06-25
    Wydawca:
    Uniwersytet Warszawski. Wydział Nauk Politycznych i Studiów Międzynarodowych
    Tematy:
    Narodowy Sojusz Demokratyczny
    Indyjska Partia Ludowa
    BJP
    Indyjski Kongres Narodowy
    IKN
    Lok Sabha
    fala Modiego
    strategiczny czworobok
    Indo-Pacyfik
    region Oceanu Indyjskiego
    ASEAN
    polityka zagraniczna Indii
    National Democratic Alliance
    Bharatiya Janata Party
    Indian National Congress
    Modi Wave
    Indo-Pacific Region
    Indian Ocean
    region
    strategic quadrangle
    India’s foreign policy
    Opis:
    W 2014 r. odbyły się wybory do izby niższej parlamentu Indii, czyli Lok Sabha (Zgromadzenie Ludowe). Po raz pierwszy od 1984 r. jedna partia zdobyła ponad 50% miejsc w izbie niższej, co uprawnia ją do samodzielnego rządzenia. Wygrana koalicji Narodowego Sojuszu Demokratycznego (National Democratic Alliance, NDA) pod przewodnictwem Indyjskiej Partii Ludowej (Bharatiya Janata Party, BJP), która będzie miała 336 miejsc (na 543) w Lok Sabha, i najgorszy w historii wynik wyborczy Indyjskiego Kongresu Narodowego (IKN; uzyskał jedynie 44 miejsca w parlamencie) ukształtowały nową scenę polityczną w Indiach. Celem artykułu jest analiza wyników wyborczych oraz omówienie ich wpływu na system polityczny oraz na realizowaną przez Indie politykę gospodarczą i zagraniczną. Kwestią zasadniczą jest próba odpowiedzi na pytanie, czy zwycięstwo BJP oraz utworzenie rządu przez nowego premiera Narendrę Modiego wpłynie na tempo reform gospodarczych oraz politykę zagraniczną Indii. Wydaje się, że tak zdecydowane zwycięstwo jednej partii daje Indiom szansę przede wszystkim na realizację koniecznych, ale trudnych reform, zwłaszcza w sektorze rolnym, prawie pracy itd. W ostatnich 25 latach koalicyjne rządy nie były w stanie ich przeprowadzić. Należy jednak unikać jednoznacznych ocen. Dokonując bowiem analizy wyborów do Lok Sabha, trzeba wziąć pod uwagę specyfikę Indii. Są one państwem zróżnicowanym, wielokulturowym, z liczbą ludności sięgającą ponad 1 250 mld. W artykule przedstawione zostaną możliwe scenariusze dotyczące polityki wewnętrznej i zagranicznej. Wydaje się jednak, że wyniki wyborów nie przyniosą rewolucji, lecz ewolucję. Dotyczy to zwłaszcza polityki wewnętrznej. Nie należy spodziewać się znaczącego przyspieszenia realizacji niepopularnych reform. W dużo większym stopniu zmiany uwidocznią się w polityce zagranicznej Indii.
    In 2014, India held elections to the lower chamber of the parliament, the Lok Sabha (People’s Assembly). For the first time since 1984, one party won more than 50 per cent of the seats in the lower chamber, which allows it to govern independently. The victory of the National Democratic Alliance coalition led by the Indian People’s Party (Bharatiya Janata Party, BJP), which will have 336 seats (in 543) in the Lok Sabha, and the worst election result of the Indian National Congress ever (only 44 seats) shaped a new political scene in India. The aim of this article is to analyse the election results and discuss their impact on the political system and on India’s foreign and economic policy. The key concept of the article is to seek an answer to whether the victory of the BJP and the establishment of the new government led by Prime Minister Narendra Modi will have an effect on the pace of economic reform and foreign policy of India. It seems that such a decisive victory of one party gives India an opportunity to carry out the necessary but difficult reforms, especially in the agricultural sector, labour law, etc. However, we should avoid explicit opinions because any analysis of the elections to the Lok Sabha should take into account the specificity of India, which is a diverse and multicultural country. The article presents the possible scenarios for domestic and foreign policy, but it seems that the results of the elections will bring evolution rather than revolution. This applies especially to domestic policy. We should not expect any significant acceleration in the implementation of unpopular reforms. Considerable changes are much more likely to take place in India’s foreign policy.
    Źródło:
    Stosunki Międzynarodowe - International Relations; 2015, 51, 1; 187-211
    0209-0961
    Pojawia się w:
    Stosunki Międzynarodowe - International Relations
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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