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    Wyświetlanie 1-6 z 6
    Tytuł:
    Acoustically measured diurnal vertical migration of fish and zooplankton in the Baltic Sea - seasonal variations
    Autorzy:
    Szczucka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/48748.pdf
    Data publikacji:
    2000
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    zooplankton
    fish
    temperature
    acoustic measurement
    marine organism
    physical structure
    diurnal migration
    vertical migration
    seasonal variation
    water
    salinity
    Baltic Sea
    Opis:
    Acoustic measurements were conducted at different seasons in the last five years at a fixed point of the Baltic Sea at a frequency 30 kHzcon currently with temperature and salinity sampling. Echosounding records were used to determine the seasonal and diurnal migration patterns of scattering layers in accordance with thermohaline conditions. Different seasonal patterns of nocturnal aggregations of organisms dependent on the temperature gradient in the thermocline were found. This paper illustrates the diurnal distributions of sound scattering layers and analyses the way they are linked to the physical structure of the water.
    Źródło:
    Oceanologia; 2000, 42, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An Autonomous Hydroacoustic System for studying long-term scattering variability
    Autorzy:
    Szczucka, J.
    Groza, K.
    Porazinski, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/48119.pdf
    Data publikacji:
    2002
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    marine acoustics
    bottom
    Autonomous Hydroacoustic System
    vertical migration
    scattering
    sea surface
    Baltic Sea
    water column
    Opis:
    A new instrument, an Autonomous Hydroacoustic System, was designed to probe a water column acoustically from the bottom to the sea surface. It is capable of operating from a depth of 100 m self sufficiently for up to 10 days. A brief description of its construction and electronic design is provided. Preliminary results from the first field study consisting of a 90-hour series of backscattering measurements are presented.
    Źródło:
    Oceanologia; 2002, 44, 1
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Labour Mobility of Migrants from CIS Countries in Russia
    Autorzy:
    Mukomel, Vladimir
    Powiązania:
    https://bibliotekanauki.pl/articles/498717.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    labour migration
    labour market
    occupational mobility
    vertical mobility
    illegal employment
    Opis:
    Labour migration is discussed here in the context of the transformation of the Russian labour market. Particular attention is paid to the analysis of changes in the labour market and to the way these changes affect the structure of employment for migrant workers, their inclusion in local labour markets, and the prevalence of illegal and informal employment. Of central importance is the analysis of migrants’ vertical occupational mobility. It is concluded that the education, qualifications, and professional knowledge of migrants are not in demand in the Russian labour market; the typical path of migrants in the labour market is downward labour mobility – occupying a position that is worse than the one they previously held in their home country. Upward labour mobility is extremely rare and characteristic almost exclusively of unskilled workers.
    Źródło:
    Central and Eastern European Migration Review; 2013, 2, 2; 21-38
    2300-1682
    Pojawia się w:
    Central and Eastern European Migration Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Seismic and geochemical anomalies related to vertical migration of gas in the Radlin gas field
    Autorzy:
    Pietsch, K.
    Strzetelski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2059327.pdf
    Data publikacji:
    2001
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    vertical gas migration
    seismic anomalies
    surface hydrocarbon gas anomalies
    geochemical anomalies
    gas chimneys
    Radlin gas field
    Opis:
    In the Radlin Rotliegend gas field (southwestern Polish Lowlands, Fore-Sudetic Region, Poznań Depression), modelling and reinterpretation of seismic data combined with surface gas surveys (free gas method) help identify "gas chimneys" and locate pathways of vertical migration. An almost impermeable Zechstein evaporite cover reduces the stream of vertical gas migration so that a dry surface geochemical zone occurs at the surface and no seismic disturbances are observed directly above the pay zone of the gas field. The surface gas anomalies form a halo-type pattern surrounding the gas field. The majority of surface hydrocarbon microseepages from the subsurface agrees with the seismically visualised geological structure. The belts of surface gas anomalies and the dry zones separating them run along the strike of Permian structures and faults. Vertical pathways of gas migration are recognisable as zones of seismic discontinuity and chaotic distribution of distinct reflections and diffracted waves. Seismic "gas chimney" effects coincide with surface hydrocarbon gas anomalies. Particularly, they appear above the upper terminations of faults disturbing the Zechstein deposits. The faults create the main a venues for secondary vertical migration of gas from the reservoir to the surface. "Gas chimneys" are observable in a shallow zone above the Muschelkalk (Tm) where higher gas saturation of more porous rocks produces a seismically traceable velocity effect.
    Źródło:
    Geological Quarterly; 2001, 45, 1; 1-14
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of atmospheric conditions on the migration of diesel fuel spilled in soil
    Autorzy:
    Vuruna, M.
    Veličković, Z.
    Perić, S.
    Bogdanov, J.
    Ivanković, N.
    Bučko, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/204748.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    diesel fuel
    spillage
    sand
    clay
    vertical migration
    Opis:
    The most common chemical’s spills in typical transportation accidents are those with petroleum products such as diesel fuel, the consequence of which is an extensive pollution of the soil. In order to plan properly fuel recovery from the soil, it is important to gain information about the soil depth which may be affected by pollutant and to predict the pollutant concentration in different soil layers. This study deals with the impact of basic atmospheric conditions, i.e. air temperature and humidity on the diesel fuel migration through the soil. The diesel fuel was spilled into columns (L = 30 cm; D = 4.6 cm) filled with sandy and clay soil samples, and its concentrations at various depths were measured after 11 days under various air temperature (20 and 40°C) and relative humidity (30–100%) conditions. The effects observed were explained by understanding physical processes, such as fuel evaporation, diffusion and adsorption on soil grains. The increase in temperature results in higher fuel evaporation loss and its faster vertical migration. The relative humidity effect is less pronounced but more complex, and it depends much on the soil type.
    Źródło:
    Archives of Environmental Protection; 2017, 43, 1; 73-79
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Total mesh migration into the gastric lumen after vertical banded gastroplasty: A case report
    Autorzy:
    Reshlani, G.
    Formiga, A.
    Gambetti, A.
    Mian, E.
    Colombo, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1065161.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Gastric Bypass
    Roux-n-Y
    mesh migration
    revision surgery
    vertical banded gastroplasty
    Opis:
    Vertical banded gastroplasty (VBG) is a remote bariatric restrictive procedure, more common in 1980s and initial 1990s. Many patients still possess this anatomy with its inherent complications. The reoperation rate for failure/complications reported in long-term studies is approximately 56 %, sometimes the surgical revision is technical complex and invasiveness. Sleeve gastrectomy (SG) has been at first used to revise failed restrictive procedures. This study takes in vision a patient which was operated of VBG 15 years ago. This patient underwent a Roux-n-Y Gastric Bypass because of total intra luminal mesh migration. In this case the mesh migration caused a gastric lumen stenosis, it was necessary a complex revision surgical operation to remove the tight ring.
    Źródło:
    World Scientific News; 2019, 120, 2; 259-265
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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