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    Wyświetlanie 1-6 z 6
    Tytuł:
    Diel Vertical Migration observed by acoustic doppler current profiler
    Autorzy:
    Schmidt, B.
    Szczucka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/331981.pdf
    Data publikacji:
    2010
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    This paper presents the results of continual 17-week ADCP measurements applied to investigate the migratory behaviour of the Baltic animals. The velocities of vertical migration are determined in different ways and the results are compared. Strict correlation of the moments when downward or upward migration starts with sunrise and sunset times, is confirmed. Additionally, vertical and horizontal movements of water content are examined. Even though quite slow in comparison with horizontal flow, vertical migration exists independently of other factors.
    Źródło:
    Hydroacoustics; 2010, 13; 235-242
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Bioacoustic measurements by use of acoustic doppler current profiler
    Autorzy:
    Szczucka, J.
    Schmidt, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/332129.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    Nowadays, each oceanographic vessel is equipped with an Acoustic Doppler Current Profiler. Its task is to determine the value and direction of the vector of water current. It measures the Doppler shift in the frequency of the acoustic wave backscattered by neutrally floating particles suspended in the sea water. A by-product of such measurement is proportional to backscattering strength SV. Starting with the pilot work by Flagg and Smith [3], an ADCP becomes a useful tool for the investigations of the distribution and migration of zooplankton. It enables current and zooplankton abundance to be obtained simultaneously. The presented paper is an attempt to exploit the data collected in a routine way by the ADCP mounted on r/v ‘Oceania’ to characterise the biological aggregations, and especially to estimate the distribution of zooplankton and to observe their diel vertical migration.
    Źródło:
    Hydroacoustics; 2004, 7; 209-216
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Echosounder and ADCP investigation of Baltic fauna
    Autorzy:
    Schmidt, B.
    Szczucka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/332586.pdf
    Data publikacji:
    2007
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The Baltic fauna is rather meagre, what is connected with their miserable habitat. The area of our investigation is a specific basin because of its land-locked location, brackish water and small depth. It is characterised by enormous diversity of time-variable hydrological conditions. All species of fauna are subjected to the continuous stress of having to adapt to rapid changes in the temperature and salinity of the surrounding water and are exposed to highly variable environment during their every-day vertical migration between the food-rich sea surface and safer deep. The purpose of this paper is to present the results of acoustic investigations of the live interior of the Baltic Sea by means of various acoustic instruments (echosounders and acoustic Doppler current meters). The interpretation of our acoustic images helps to understand the nature and behaviour of the sound scatterers.
    Źródło:
    Hydroacoustics; 2007, 10; 175-182
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the ADCP geometry on the results of measurement
    Autorzy:
    Szczucka, J.
    Schmidt, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/332628.pdf
    Data publikacji:
    2005
    Wydawca:
    Polskie Towarzystwo Akustyczne
    Opis:
    The problem of verification of the fundamental rule of operation of Acoustic Doppler Current Profiler assuming the uniform current field within the four acoustic beams is studied. Analysis of scattering differences observed in four beams allows us to conclude about the homogeneity or inhomogeneity of the flow field. Geometry of the measurement performed by the ADCP is presented. The distance between beams, sampling volume and vertical resolution are studied in connection with the system parameters and depth of beam penetration. The so called anomaly index is invented in order to find the areas of the strongest variability. Examples of the inhomogeneity of the acoustic field within the measuring setup are presented and analysed. Differences observed in the strength of echosignal obtained by ADCP (150 kHz) and ELAC echosounder (30 kHz) are also analysed. Some reasonable explanations are examined, like the resonance of gas bubbles included inside the bodies and directional response of animals.
    Źródło:
    Hydroacoustics; 2005, 8; 227-232
    1642-1817
    Pojawia się w:
    Hydroacoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pomiar mocy mechanicznej maszyn elektrycznych poprzez pomiar kąta skręcenia wału
    Measurement of electrical machinery mechanical power by measurement of angular twist of shaft
    Autorzy:
    Barszcz, T.
    Urbanek, J
    Schmidt, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1373850.pdf
    Data publikacji:
    2009
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
    Tematy:
    pomiar mocy mechanicznej
    moc mechaniczna
    maszyna elektryczna
    pomiar kąta skręcania
    Opis:
    Mechanical power carries important information about the technical state of rotating machinery. Dynamic measurement of the mechanical power is especially important for electrical machines. The paper presents the idea of mechanical power measurement by measurement of the angular twist of the shaft. The measurement is based on analysis of pulses from two disks, installed at two ends of the machine. It gives accurate information about changes of the rotational speed as well as the twist angle of the shaft. Next, the paper presents developed data processing algorithms. It is impossible in practice to machine ideal impulse disks and thus it is necessary to apply the compensation of results based on measured innacuracies. The proposed method is discussed and shown applicable for measurement of the angular twist of the power generation turboset. The method was validated on a test rig. The design of the rig and test measurements are presented. Measured mechanical power was compared with the electric power measured by traditional methods. High correlation of these values was achieved.
    Źródło:
    Maszyny Elektryczne: zeszyty problemowe; 2009, 82; 233-237
    0239-3646
    2084-5618
    Pojawia się w:
    Maszyny Elektryczne: zeszyty problemowe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Acoustical estimation of fish distribution and abundance in two Spitsbergen fjords
    Autorzy:
    Szczucka, J.
    Hoppe, L.
    Schmidt, B.
    Fey, D.P.
    Powiązania:
    https://bibliotekanauki.pl/articles/47822.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    Arctic region
    fish
    cod
    Gadus morhua
    Norway haddock
    Melanogrammus aeglefinus
    fish distribution
    fish abundance
    acoustics
    climate change
    global warming
    Spitsbergen fjord
    Opis:
    Over recent decades, the Arctic region has been subjected to rapid climate change stemming from global warming. The advance of Atlantic waters to high latitudes is notable. The increased abundance of fish, such as cod (Gadus morhua) and haddock (Melanogrammus aeglefinus), has been reported near the western coast of Spitsbergen and entering fjords together with Atlantic waters. This study used multifrequency acoustics to measure fish distribution and abundance in 2013–2014 in two Arctic fjords, the colder Hornsund, which is typically of Arctic character, and the warmer Kongsfjorden, which is more of Atlantic character. The study revealed a bimodal fish size distribution with larger fish in the deep parts of fjords, and smaller fish distributed in more shallow waters. An evident increase in the abundance of large fish, most probably Atlantic cod, was observed in Hornsund and especially in Kongsfjorden in 2014 in comparison to 2013. The intense inflow of Atlantic water on the shelf in 2014 is suggested as the explanation for this phenomenon.
    Źródło:
    Oceanologia; 2017, 59, 4
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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