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Wyszukujesz frazę "Tomczak, R." wg kryterium: Autor

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Spalanie pozostałości pozrębowych, a emisja lotnych produktów
    Burning of wood slash as a source of air pollution
    Autorzy:
    Wojtkowiak, R.
    Nowiński, M.
    Tomczak, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/1026618.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    tlenki azotu
    pozostalosci zrebowe
    spalanie
    odpady pozrebowe zob.pozostalosci zrebowe
    gazy
    dwutlenek wegla
    dwutlenek siarki
    tlenek wegla
    lesnictwo
    zanieczyszczenia powietrza
    emisja zanieczyszczen
    dwutlenek azotu
    burning
    utilization
    wood slash
    bonfire
    air pollution
    Opis:
    Concentrations of gaseous air pollutants were measured during burning of wood slash in a clear−cut pine forest stand. Large amounts of CO2 and CO were produced in this process, and the forest ecosystem lost considerable amounts of nitrogen and sulphur. In the study area, increased concentrations of NO, NO2, CO and SO2 were detected in the air. Instantaneous concentrations of NO2 and SO2 sometimes exceeded permissible levels.
    Źródło:
    Sylwan; 2003, 147, 08; 55-60
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Spalanie pozostałości pozrębowych a nagrzewanie się gleby
    Soil temperature during wood slash burning
    Autorzy:
    Wojtkowiak, R.
    Nowiński, M.
    Tomczak, R.J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1026418.pdf
    Data publikacji:
    2003
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    spalanie
    oddzialywanie na glebe
    odpady zrebowe
    lesnictwo
    temperatura gleb
    ogniska
    burning
    utilization
    soil
    heating
    bonfire
    wood slash
    Opis:
    The work presents results of soil temperature measurements under bonfires in which felling residues (branches, twigs, needles) were burnt in a clear−cut area. An increase in soil temperature was observed to the depth of 50 cm below ground level. In the humus horizon, the temperature greatly exceeded the threshold value above which protein denaturation takes place. The ectohumus horizon, with a high water content, initially protected the mineral soil against an increase in temperature and later retarded this increase.
    Źródło:
    Sylwan; 2003, 147, 06; 22-27
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Naturalne suszenie surowca drzewnego w miejscu pozyskania
    Natural drying of wood in the cutting area
    Autorzy:
    Tomczak, A.
    Jelonek, T.
    Leszczyński, N.
    Korzeniewicz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/988961.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    uzytkowanie lasu
    surowce drzewne
    drewno swiezo sciete
    masa drewna
    wilgotnosc drewna
    suszenie naturalne
    magazynowanie
    biomass
    energy wood
    industrial wood
    storage
    moisture content
    Opis:
    Wood obtained from freshly cut trees has a high moisture content and therefore its mass per volume unit is higher than the mass of dry wood. The natural drying is a simple and effective method of weight (moisture content) reduction, making a better use of the vehicle's payload, and thus reducing costs, including environmental costs. The conclusion is based on simulations and analyzes attempting to evaluate different solutions. As evidenced, the drying process of logs depends on numerous factors, which entails attempts at development of an optimal logging method, especially concerning energy wood, allowing for maximum value growth in as little time as possible. The suggestions cover various forms of logging (of whole trees, long timber), arranging (in piles, bundles), storing (in stands, by the roadside near cutting areas), and protection. Combined methods such as storing under canvas for winter only or storing in cutting areas and later in piles at the exit road also work in practice, but require more funds because their cost is determined by the number of stages composing the whole process. In case of wood, development of an optimal and simultaneously universal method used to prepare the lumber for transport and its delivery with consideration of as little environmental impact as possible is complicated. The numerous variables, some of which cannot be controlled or affected, create a considerable scientific problem as well. The authors covered in the presented literature review often stress the role of specific weather conditions accompanying an experiment or its location, the storage method, or lumber dimensions in the drying process. Storage time is perceived as equally important, but it is a derivative more or less determined by the previous variables. Previous studies of drying at the cutting area have been focused mainly on energy wood and less on industrial wood. They analysed the results of long−term storage and did not stress the potential advantages of short−term drying. Furthermore, we do not have sufficient information on species, including forest trees, which have a lower share in the volume of the logged wood. Advanced research can help establish the minimum mass (moisture content) with considerable impact on supply chain effectiveness improvement or evaluated various storing and drying methods. We reviewed reports explaining the impact of various factors on natural drying of wood, models and storage effects, and analyzing potential economic and environmental benefits.
    Źródło:
    Sylwan; 2017, 161, 11; 898-908
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wskaźniki stabilności drzew w drzewostanach sosnowych uszkodzonych przez wiatr
    Indices of tree stability in Scots pine stands damaged by wind
    Autorzy:
    Jelonek, T.
    Walkowiak, R.
    Jakubowski, M.
    Tomczak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/993204.pdf
    Data publikacji:
    2013
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewostany sosnowe
    uszkodzenia drzew
    wiatry
    drzewa lesne
    sosna zwyczajna
    Pinus sylvestris
    stabilnosc
    smuklosc drzew
    srodek ciezkosci
    dlugosc korony
    objetosc korony
    scots pine
    stability
    wind
    damage
    Opis:
    The aim of the study was to determine the effect of selected tree stability indices described by individual biometric characteristics on the formation of their wind resistance. The analysis of tree stability was based on easily measurable tree traits, such as height, breast height diameter, crown parameters as well as the centre of gravity and slenderness factor. Investigations were conducted in wind−damaged Scots pine stands, where a total of over 600 trees were measured, of which almost 40% specimens were wind−broken. Results indicate that a significant role in the modification of tree stability is played by the slenderness factor, the location of the centre of gravity and crown parameters. Most of the analysed traits are strongly cross−correlated. However, these are slenderness and crown length that describe tree stability the best.
    Źródło:
    Sylwan; 2013, 157, 05; 323-329
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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