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    Wyświetlanie 1-8 z 8
    Tytuł:
    Sea floor classification using multibeam sonar
    Autorzy:
    Łubniewski, Z.
    Chybicki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/332796.pdf
    Data publikacji:
    2009
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Tematy:
    sea floor classification
    multibeam sonar
    hydroacoustics
    Opis:
    The paper presents the method of seabed identification and classification using multibeam sonar echoes. The proposed approach is based on calculation of a set of parameters of an echo envelope. The parameters are extracted for each consecutive beam allowing the estimation of their dependence on the seafloor incident angle, and then the relation between seabed type and calculated echo parameters and its angular dependence is investigated. The paper concerns the experiment which has been carried out in Gdansk Bay in November 2008, and some comparisons of the results with those obtained during previous experiment in September 2007. The results for several bottom types are presented and discussed. It was confirmed that the information extracted from multibeam seafloor sensing data, e.g. "water column" recordings, may be useful in seafloor characterisation.
    Źródło:
    Hydroacoustics; 2009, 12; 127-132
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A method for the interpretation of sonar data recorded during autonomous underwater vehicle missions
    Autorzy:
    Zieja, Mariusz
    Wawrzyński, Wojciech
    Tomaszewska, Justyna
    Sigiel, Norbert
    Powiązania:
    https://bibliotekanauki.pl/articles/32912850.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
    Tematy:
    onar technologies
    sea floor monitoring
    autonomous underwater systems
    Opis:
    Image acquisition from autonomous underwater vehicles (AUVs) is useful for mapping objects on the seabed. However, there are few studies on the interpretation of data collected with side-scan sonar during autonomous underwater vehicle missions. By recording the seabed with 3D multibeam sonar, a large number of survey points can be obtained. The collected data are processed using applications based on remote sensing image processing. The data collected during AUV missions (or other sonar carriers) needs to be pre-processed to reach the proper effectiveness level. This process includes corrections of signal amplification (Time Varying Gain, or TVG) and geometric distortions of sonar images (Slant Range Corrections). It should be mentioned that, when carrying out the interpretation process for structures on the sea floor, sonar users need to understand the process of visualising seabed projections and depressions, as well as the resolution limitations of the sonar sensors.
    Źródło:
    Polish Maritime Research; 2022, 3; 176-186
    1233-2585
    Pojawia się w:
    Polish Maritime Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Theoretical foundations of the implementation of controlled pyrotechnical reactions as an energy source for transportation from the sea bed
    Autorzy:
    Filipek, W.
    Broda, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/134942.pdf
    Data publikacji:
    2016
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    deep sea mining
    transport from the sea floor
    blasting materials
    pyrotechnics
    implementation
    exploitation
    Opis:
    The depletion of inland deposits of natural resources and the increasing demand for some raw materials have resulted in the growing interest in deep sea exploitation of natural deposits. This gives an impulse to the mounting research and development of methods of exploitation of natural deposits from the sea and ocean floors, which are not limited to petrol and gas. The main area of difficulty in opencast mining methods conducted at considerable depths is the transportation process from the sea floor to the surface. The methods employed so far, such as continuous line bucket (CLB), hydraulic pumping (HP) and air-lift pumping (ALP), have both advantages and disadvantages. The most salient problem is their considerable energy consumption resulting in great costs, hence the need for the development of less expensive methods. The authors have suggested a new method, involving the use of pyrotechnical materials as a source of energy in the transportation from the sea floor and have presented its theoretical grounding. Special emphasis has been placed on determining the depth to which the method can be applied and the energy needed in transportation in relation to the density of the transported substance (output).
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2016, 48 (120); 117-124
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The contribution of the fine sediment fraction to the Fluffy Layer Suspended Matter (FLSM)
    Autorzy:
    Pempkowiak, J.
    Beldowski, J.
    Pazdro, K.
    Staniszewski, A.
    Leipe, T.
    Emeis, K.C.
    Powiązania:
    https://bibliotekanauki.pl/articles/48591.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    sediment fraction
    Pomeranian Bay
    Fluffy Layer Suspended Matter
    polonium
    Baltic Sea
    radioisotope
    sea floor
    lead
    Opis:
    Fluffy Layer Suspended Matter (FLSM) is a layer of fairly concentrated suspended matter resting on the sea floor. Its passage to the depositional basins in the Pomeranian Bay – Arkona Deep System of the Baltic Sea is estimated to take around six months. In the course of this migration, the properties of FLSM change as a result of ageing and the influx of fresh particles from the water column, and possibly also because of mass exchange with the uppermost sediment layers. Measurements of radioisotopes (210Po, 210Pb, 137Cs) have demonstrated that in shallow water this topmost layer of sediments, from 8 cm to 3 cm in thickness, is subject to mixing. This creates redox profiles favourable to biota and bioturbation. Basing on 210Pb/210Po disequilibria and the 210Po excess, it was estimated that under steady state conditions from 1.5 to 2.2% of fine fraction (FSF) in the mixed layer of sediments is freshly imported from FLSM. This implies replacement of FSF from the sediments and its incorporation into FLSM. On the assumption that the surface density of FLSM is 10 mg cm−2, FSF freshly exported from sediments actually comprises up to 15% of FLSM. Therefore, the properties of FLSM are strongly influenced by the processes taking place in the sediments, although FLSM by definition is independent of sediments.
    Źródło:
    Oceanologia; 2002, 44, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Sea-floor massive sulphides from the Galápagos Rift Zone – mineralogy, geochemistry and economic importance
    Autorzy:
    Szamałek, K.
    Marcinowska, A.
    Nejbert, K.
    Speczik, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059147.pdf
    Data publikacji:
    2011
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    Galápagos Rift Zone
    sea-floor massive sulphides (SMS)
    mineralogy and geochemistry
    economic evaluation
    Opis:
    The largest reserves of the Earth's mineral resources are located on the ocean floor. Amongst these, hydrocarbon and metallic resources are of the greatest importance. In 2010, the International Seabed Authority (ISA) adopted rules for documenting new metal resources contained with polymetallic sea-floor massive sulphides (SMS). Russia and China were the first countries to apply to the ISA to acquire the right to commence initial investigation and documentation in the Indian and Atlantic oceans. Apart from copper, cobalt and nickel, modern SMS ores contain inferred significant amounts of gold, silver and PGE. The results described here from Galápagos Rift samples indicate a high concentration of gold (up to 7.24 ppm) and platinum (up to 350 ppb), which are mainly concentrated in low temperature parts of the sulphide mounds. The high content of Au and Pt revealed by this study provides further motivation towards attempting the exploration of marine massive sulphides. This is particularly important in the light of the high prices of metal commodities, and especially the unprecedented price of gold. This paper is the first such detailed scientific account in the Polish scientific literature focusing on the genesis and economic significance of the modern sea-floor sulphides.
    Źródło:
    Geological Quarterly; 2011, 55, 3; 187-202
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental verification of the concept of the use of controlled pyrotechnic reaction as a source of energy as a part of the transport system from the seabed
    Autorzy:
    Filipek, W.
    Broda, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/135689.pdf
    Data publikacji:
    2017
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    deep sea mining
    transport from the sea floor
    blasting materials
    pyrotechnics
    experimental verification
    source of Energy
    Opis:
    In this article the authors discuss the concept of using pyrotechnical materials for transportation in deep sea environment. The use of pyrotechnical materials in underwater transportation involves their use as a source of energy (needed, for instance, in emptying the ballast tank). The authors presented the experimental verification of the usefulness of pyrotechnical materials in transporting from great depth. In the experiments, a modified composition black powder was used as source of energy. In the research the authors focused on two methods of controlling the pyrotechnical reaction effects, i.e., mechanical suppression of the blast, so as to reduce its negative effect on the housing of the transporter, and control of the pyrotechnical reaction itself. The obtained results confirm the possibility of using pyrotechnical materials in transportation of deposits from considerable depth.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2017, 49 (121); 77-83
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The challenge of reconstructing the Phanerozoic sea level and the Pacific Basin tectonics
    Autorzy:
    Ruban, Dmitry A.
    Conrad, Clinton P.
    Loon, A. J. (Tom)
    Powiązania:
    https://bibliotekanauki.pl/articles/94614.pdf
    Data publikacji:
    2010
    Wydawca:
    Uniwersytet im. Adama Mickiewicza w Poznaniu
    Tematy:
    sea-floor bathymetry
    dynamic topography
    sea-level changes
    plate tectonics
    Pacific
    Panthalassa
    Phanerozoic
    batymetria dna morskiego
    dynamiczna topografia
    zmiany poziomu morza
    płyty tektoniczne
    Pacyfik
    Opis:
    The relationships between the interior dynamics of our planet and global sea level can be unravelled when plate-tectonic reconstructions are available for the entire Earth. A review of global tectonics reveals significant deficiencies in our understanding of the geodynamic evolution of the Pacific (Panthalassa or Proto-Pacific) during the Cambrian-Jurassic time-span. This particular, but major, shortcoming presents a true challenge for modern geoscientists, who are encouraged to produce a detailed plate-tectonic reconstruction of the Pacific for the pre-Cretaceous in order to advance our understanding of Phanerozoic sea-level change. A set of approaches, including geological/geophysical modelling, investigation of accretionary prisms, palaeobiogeographical studies, and careful examination of eustatic sea-level changes, are proposed that will help geoscientists tackle the challenge of understanding how Pacific geodynamics affected global sea level during the Phanerozoic.
    Źródło:
    Geologos; 2010, 16, 4; 235-243
    1426-8981
    2080-6574
    Pojawia się w:
    Geologos
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charakterystyka morfologiczno-mineralogiczna konkrecji polimetalicznych ze strefy Clarion-Clipperton na Oceanie Spokojnym – wyniki wstępne
    Morphological and mineralogical characteristics of polymetallic nodules from the Clarion-Clipperton zone on the Pacific Ocean -preliminary results.
    Autorzy:
    Kozłowska-Roman, Agata
    Mikulski, Stanisław Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/2075981.pdf
    Data publikacji:
    2019
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    konkrecje polimetaliczne
    EMPA
    skład chemiczny
    osad morski
    strefa Clarion-Clipperton
    Pacyfik
    polymetallic nodules
    chemical composition
    sea-floor sediment
    Clarion-Clipperton Zone
    Pacific Ocean
    Opis:
    Manganese nodules, known also as polymetallic nodules, from the Clarion-Clipperton Zone on the Pacific Ocean were examined by the electron microprobe method to determine their chemical and mineralogical compositions. Two different types of layers were distinguished and total metal content was determined. Macroscopic investigations were also described.
    Źródło:
    Przegląd Geologiczny; 2019, 67; 169--172
    0033-2151
    Pojawia się w:
    Przegląd Geologiczny
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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