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    Wyświetlanie 1-3 z 3
    Tytuł:
    Stream water temperature: a short review with special reference to diurnal dynamics
    Autorzy:
    Łaszewski, Maksym
    Powiązania:
    https://bibliotekanauki.pl/articles/2035823.pdf
    Data publikacji:
    2013-04-10
    Wydawca:
    Uniwersytet Warszawski. Wydział Geografii i Studiów Regionalnych
    Tematy:
    Stream water temperature
    Heat exchange processes
    Diurnal dynamics
    Data loggers
    Świder river
    Opis:
    Dynamic changes in stream water temperature are caused by thermal energy exchange at the interface between the water and the atmosphere, and between the water and the streambed. This heat flux is the result of physical processes which are stimulated by external drivers that control water temperature both in temporal and spatial scales. For streams, the most characteristic are diurnal fluctuations of temperature. For the purposes of this paper, electronic data loggers were used which allowed a presentation of the diurnal cycles of water temperature in a small lowland river. The measurements confirmed that meteorological conditions have a significant impact on the diurnal dynamics of stream temperature.
    Źródło:
    Miscellanea Geographica. Regional Studies on Development; 2013, 17, 1; 34-41
    0867-6046
    2084-6118
    Pojawia się w:
    Miscellanea Geographica. Regional Studies on Development
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Możliwości ręcznego przemieszczania surowca krótkiego podczas pozyskania sosny, świerka, brzozy i buka w cięciach pielęgnacyjnych
    Capabilities of manhandling small logs in commercial thinning in pine, spruce, beech, and birch stands
    Autorzy:
    Tomczak, A.
    Grzywiński, W.
    Jelonek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/986671.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany
    ciecia pielegnacyjne
    sosna
    swierk
    brzoza
    buk
    pozyskiwanie drewna
    drewno krotkie
    drewno sredniowymiarowe
    masa drewna
    reczne przemieszczanie surowca drzewnego
    przemieszczanie ciezarow
    health
    musculoskeletal symptoms
    loggers
    weight of logs
    green density
    Opis:
    The aim of this study was to measure the weight of timber obtained from freshly cut trees and compare it with the applicable legal provisions pertaining the capability of transporting heavy loads by hand and also to indicate a problem significant for the occupational safety and health protection of employees working at wood harvesting. In Poland, about 40 million m3 of timber is harvested annually. The logs, with small diameter and length, are prepared for forwarding by arranging them by employees in the so called ‘packages’, which are placed by the route of the machine that collects and transports them to the logging road. Manhandling of the logs is an activity requiring the greatest energy expenditure (over 30 kJ/min) in the process of tree harvesting. Furthermore, it is also one of the key factors, which may lead to the development of musculoskeletal disorders. Regulations existing in the Polish labour law regulate the permitted weight of transported loads depending on the activity duration. For loads transported single−handedly this is 30 kg for a permanent employer, whereas 50 kg for workers doing the job occasionally or temporarily (no more than 4 times per hour and no longer than 4 hours during workday). Logs heavier than 50 kg may be carried only collectively providing the requirements of the minimal length (0,75 m) of the log per one person are met. We produced 2,5 m long logs and weighted them with an accuracy of 0,1 kg. The analysis revealed that approximately 30% of logs weighed between 30 and 50 kg, which introduces limitations in the number of carried logs per one person within a single shift. However, about 10% of the pine, 15% of spruce, 12% of beech and 38% of birch logs were heavier than 50 kg which should prevent carrying them single−handedly. Unfortunately, collective preparation of timber for forwarding is not popular among workers due to reduction in output, and at the same time the lower salary. Even if log for forwarding is prepared by two labourers, they most often work separately. As a result, the limits of the weight carried single− handedly by labourer are notoriously violated and exceeded.
    Źródło:
    Sylwan; 2018, 162, 07; 531-538
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Proces usamodzielniania się śledzonych telemetrycznie bielików Haliaeetus albicilla z Parku Narodowego „Bory Tucholskie” w okresie post-pisklęcym
    The process of becoming independent in the post-fledling period of the telemetry tracked White-tailed Eagles Haliaeetus albicilla from the “Bory Tucholskie” National Park
    Autorzy:
    Anderwald, Dariusz
    Lubińska, Karolina
    Powiązania:
    https://bibliotekanauki.pl/articles/16728959.pdf
    Data publikacji:
    2021
    Wydawca:
    Instytut Badawczy Leśnictwa
    Tematy:
    White-tailed Eagle
    Bory Tucholskie National Park
    telemetry research
    GPS loggers
    spatial ecology
    large chicks
    feeding grounds
    exploration flights
    dispersion
    bielik
    Park Narodowy Bory Tucholskie
    badania telemetryczne
    rejestratory GPS
    ekologia przestrzenn
    duże pisklęta
    loty na żerowiska
    loty eksploracyjne
    dyspersja
    Opis:
    In 2019-2020, as part of the research on the spatial ecology of the White-tailed Eagle in the “Bory Tucholskie” National Park (PNBT), 4 GPS loggers were given to large chicks. In 2019, chicks from two different nests were equipped with these devices, and in 2020, another two chicks from the same nests. It has been shown that the dispersion of juvenile White-tailed Eagles is preceded by a preparation period lasting several weeks, during which large chicks go through several characteristic stages: weakly volatile pod flying on the branches, short training flights outside the nest, directed flights to the feeding grounds (<3 km) and long-distance (>3 km) exploration flights. The first flights of the examined individuals outside the nest area were made between the 6th and 13th July, while the first flights to the feeding grounds occurred between the 28th July and 7th August. All tracked individuals began longer exploratory flights (N=64, X=16), with a maximum distance of 43.2 km from the nest (X=11.76 km, Me=10.01 km) between the 9th August and 1st September. In both years of study, the young birds from the same breeding area left the nest and its surroundings in the third week of August and moved 1,300 m to the NE, to the peninsula of the main lake in the Park. Juvenile White-tailed Eagles from the “Bory Tucholskie” National Park began their independence period between the 5th and 22nd October. During the first 30 days from the moment of leaving the breeding area, juveniles left the Park in various directions travelling for distances of 39-80 km, using strategies of abrupt displacement and nomadism, gradually exploring the feeding grounds.
    Źródło:
    Leśne Prace Badawcze; 2021, 82, 4; 131-142
    1732-9442
    2082-8926
    Pojawia się w:
    Leśne Prace Badawcze
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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