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Wyszukujesz frazę "Jakubowicz, P." wg kryterium: Autor

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Impact of a fresh broadleaved forest site and fresh mixed broadleaved forest site on selected parameters and ratios of silver birch (Betula pendula Roth.) wood fibre structure
    Autorzy:
    Lachowicz, H.
    Paschalis-Jakubowicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/52429.pdf
    Data publikacji:
    2014
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
    Tematy:
    fresh broadleaved forest
    fresh mixed broadleaved forest
    forest site
    wood parameter
    silver birch
    Betula pendula
    wood fibre
    wood structure
    Opis:
    The variability of selected ratios characterising the dimensions and shape of silver birch wood fibres was determined based on the site where the trees grow. Two sampling areas were selected, located in the Biała Podlaska Forest District in eastern Poland. Samples for testing were taken from trees approx. 45–50 years old, growing on a fresh broadleaved forest site and on a fresh mixed broadleaved forest site. On these two sites, silver birch occurs most widely as a dominant species, both in terms of stand area and volume, in Poland. A statistical analysis was performed of selected parameters of the wood fibre structure such as length, width, lumen and cell wall thickness, as well as of the wood fibre structure ratios belonging to the basic properties of fibrous pulp: the felting power, flexibility ratio, coefficient of rigidity, Runkel and Mühlsteph ratios, as well as the compactness index. It was demonstrated that the site from which birch material originates has a significant impact on the average values of: fibre length, lumen, flexibility ratio, and the coefficient of rigidity, as well as the Runkel and Mühlsteph ratios. However, analyses did not prove any major impact of the site on the average values of: fibre width and wall thickness, the felting power or the compactness index of silver birch wood.
    Źródło:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2014, 57, 193
    1644-3985
    Pojawia się w:
    Drewno. Prace Naukowe. Doniesienia. Komunikaty
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zmienność wybranych wskaźników struktury włókien drewna brzozy brodawkowatej (Betula pendula Roth.) w północno-wschodniej Polsce
    Variability of the wood fibre structure indices for silver birch (Betula pendula Roth.) in north-eastern Poland
    Autorzy:
    Lachowicz, H.
    Paschalis-Jakubowicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1008914.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    lokalizacja
    wiek drzew
    brzoza brodawkowata
    Betula pendula
    wlokno drzewne
    struktura wlokien
    wskaznik smuklosci
    wskaznik gietkosci
    wskaznik sztywnosci
    wskaznik sztywnosci Runkla
    wskaznik Muhlstepha
    silver birch
    fibre structure indices
    wood anatomic features
    Opis:
    The variation of the fibre structure indices was determined for silver birch. The examined trees came from north−eastern Poland, which is the largest source of raw material of this species. Wood samples were taken for measurement from trees aged 45 and 70 years that grew in the fresh deciduous forest habitat. Fibre structure indices measuring felting, flexibility, rigidity, rigidity according to Runkel as well as Mühlsteph's and compactness indices were selected as the basic fibre pulp properties and subjected to statistical analysis. A significant effect of the location and age of trees on all wood fibre structure indices except for the effect of age on the compactness index was found. The studies also showed a significant, simultaneous effect of tree location and age on the mean values of all analysed indices of silver birch wood fibre structure.
    Źródło:
    Sylwan; 2011, 155, 07; 446-458
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ siedliska na wybrane właściwości strukturalne i fizyko-mechaniczne drewna brzozy brodawkowatej (Betula pendula Roth.)
    Effect of habitat on the selected structural and physico-mechanical properties of silver birch (Betula pendula Roth.) wood
    Autorzy:
    Lachowicz, H.
    Jednoralski, G.
    Paschalis-Jakubowicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/990000.pdf
    Data publikacji:
    2014
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    brzoza brodawkowata
    Betula pendula
    siedliska lesne
    las swiezy
    las mieszany swiezy
    drewno brzozowe
    wlasciwosci strukturalne
    wlasciwosci fizykomechaniczne
    czynniki siedliska
    silver birch
    structural and physical−mechanical properties
    commercial quality
    habitat type
    Opis:
    The aim of the research was to determine the habitat−related variation in the selected structural and physical−mechanical properties of silver birch. Two sample plots were established in the territory of the Biała Podlaska Forest District in eastern Poland. Samples for measurement were taken from the plots with trees aged 45−50 years growing in the fresh deciduous (Lśw) and fresh mixed deciduous (LMśw) forest habitats. The following properties were subjected to statistical analysis: the average width of annual rings, wood density determined for the samples of 20×20×300 mm, 20×20×30 mm, and 30×2.66×0.1 mm in size (the last dimension parallel to grain), tensile strength parallel to grain, compression strength parallel to grain, static bending, modulus of elasticity in static bending and the coefficients of tensile strength parallel to grain, compression parallel to grain, static bending, and modulus of elasticity in static bending. The research confirmed a significant effect of the habitat on the mean values of birch wood density for all examined sample sizes, tensile strength parallel to grain, static bending and modulus of elasticity in static bending. No significant effect of the habitat on the mean values of annual ring width, tensile strength parallel to grain and the coefficients of tensile strength parallel to grain, compression strength parallel to grain, static bending and modulus of elasticity in static bending for birch wood samples was found.
    Źródło:
    Sylwan; 2014, 158, 04; 285-291
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Rynek drzewnego surowca brzozowego w Polsce w latach 2008-2012
    Silver birch timber market in Poland in 2008-2012
    Autorzy:
    Lachowicz, H.
    Wysocka-Fijorek, E.
    Paschalis-Jakubowicz, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/989465.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewa lesne
    brzoza brodawkowata
    Betula pendula
    surowce drzewne
    drewno brzozowe
    struktura sortymentowa
    podaz
    ceny
    rynek drzewny
    analiza rynku
    lata 2008-2012
    Panstwowe Gospodarstwo Lesne Lasy Panstwowe
    silver birch
    timber market
    sales of timber
    wood prices
    Opis:
    The article presents an analysis of the birch market in Poland in 2008−2012, including the acquisition (supply) of birch wood, the income structure, prices of birch wood, the structure of birch wood recipients and the volume of purchased timber. The necessary materials were obtained from the Forest Data Bank (BDL) and the State Forests Information System (SILP). The S2 wood assortment representing more than 54% of all assortment groups is most often harvested in Poland. Next come M1 representing 14%, as well as S4 and WC – each with share slightly exceeding 11%. The vast majority of the harvested and handled birch wood is in the group of medium−sized assortments S representing 66%, and in the group of small−sized assortments M representing 14%. Birch wood classified as large−sized W totals 20%. Similarly, timber assortments from group S2 also generate the largest portion of revenues (over 50% of total revenues from birch wood sales). High fluctuations in the prices of certain groups of birch wood assortments constitute a significant problem from the point of view of both the State Forests and wood consumers. A possible reduction in the supply of wood of this species in the future may deepen this phenomenon. Average sales prices of birch wood on the Polish market are lower than the prices obtained by timber producers in the neighbouring countries. The price differences in favour of foreign timber producers reach up to 20% and relate to roundwood in different quality and size classes. The exceptionally high technical quality of birch wood in our country does not translate to higher prices per cubic meter of raw timber in the domestic turnover. The sharp increase in the demand for a special type of fibres for the manufacture of many products characterized by exceptional strength (i.e. products from polymers) and textiles with special insulating properties, as well as the production of certain grades of paper and board, will stimulate the consumption of birch wood in the future.
    Źródło:
    Sylwan; 2016, 160, 12; 971-980
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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