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Wyszukujesz frazę "anatomy of wood" wg kryterium: Wszystkie pola

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    Wyświetlanie 1-4 z 4
    Tytuł:
    Właściwości i wykorzystanie Jałowca pospolitego (Juniperus communis L.)
    Unknown physico-chemical properties of wood and the uses of common juniper (Juniperus communis L.)
    Autorzy:
    Surmiński, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1024272.pdf
    Data publikacji:
    2004
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    drewno jalowcowe
    jalowiec pospolity
    zastosowanie
    Juniperus communis
    budowa drewna
    smola jalowcowa
    lesnictwo
    olejek jalowcowy
    drzewa lesne
    anatomy of wood
    physical properies
    chemical substances
    tar
    etherical oils
    Opis:
    Author reports on physico−chemical properties and the uses of juniper wood, tar and etheric oils obtained from juniper wood and fruits.
    Źródło:
    Sylwan; 2004, 148, 07; 46-52
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Właściwości fizyczne i mechaniczne oraz budowa anatomiczna drewna jałowca pospolitego (Juniperus communis L.)
    Physical and mechanical properties and anatomy of common juniper (Juniperus communis L.) wood
    Autorzy:
    Kozakiewicz, P.
    Życzkowski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/973557.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    nauka o drewnie
    Juniperus communis
    budowa drewna
    budowa anatomiczna
    właściwości mechanicze
    leśnictwo
    jałowiec pospolity
    drewno jałowcowe
    właściwości fizyczne
    common juniper
    wood anatomy
    physical and mechanical properties
    Opis:
    The common juniper is a well−known arboreal plant with wide range of the occurrence and small habitat requirements. It is the most numerous coniferous shrub in Poland, sometimes taking shape of small tree. There is no sufficient data about the anatomy as well as physical and mechanical properties of common juniper wood in available literature. Hence, the objectives of this paper were to supplement the knowledge about the properties and anatomy of the juniper wood. The nine trunks of the common juniper of column shape were harvested to this investigation. These small trees with height up to 5 meters were 34−38 years−old. They grew on postagricultural area on brown podzol (common sand) in Łomża Forest District (E Poland). It is a sunny area on the rim of subcontinental fresh coniferous forest – one of the typical and favourable habitat for the common juniper in Poland. We analysed the microstructural elements of common juniper wood. The main component of the microstructure are short (average length 2.5 mm) and thin−walled tracheids (wall thickness from 2.4 µm in traheids of spring wood to 4.2 µm in tracheids of summer wood). Domination of this type of microstructural elements has influence on physical and mechanical properties of wood. Investigated wood characterised with low coefficient of shrinkage. The volumetric coefficient of shrinkage is 10.2%, so the wood has not tendency to crack and distort. The common juniper wood has slightly higher density (562 kg/m3 in air−dry state) than Scots pine wood and similar hardness, shear strength (91 MPa), static bending strength (85 MPa) and compression strength parallel to grain (49 MPa). The latter is directly proportional to density of the wood. The other mechanical properties of common juniper wood: modulus of elasticity and tension strength parallel to grain are significantly lower than for Scots pine wood. It is the influence of wood microstructure, not rectilinear arrangement of cell in wood and significant content of juvenile wood. Considering these aspects and modes dimensions of common juniper raw material, the potential use are different including small wooden articles especially kitchen accessories.
    Źródło:
    Sylwan; 2015, 159, 02; 151-159
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charakterystyka techniczna drewna modrzewia dahurskiego (Larix gmellini (Rupr.) Kuzen.)
    Characteristics of technical properties of Dahurian larch (Larix gmellini (Rupr.) Kuzen.) wood
    Autorzy:
    Jankowska, A.
    Anders, B.
    Wójcik, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/980329.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    modrzew dahurski
    Larix gmelinii
    drewno modrzewiowe
    budowa drewna
    budowa mikroskopowa
    charakterystyka techniczna
    wlasciwosci fizyczne
    wlasciwosci mechaniczne
    larch
    mechanical properties
    physical properties
    brown rot fungus
    wood anatomy
    Opis:
    The wood present in trade in Poland named as ‘Siberian larch’, in fact belongs to two tree species: Larix sibirica Ledeb. and Larix gmelinii (Rupr.) Kuzen. The term itself is rather associated with the origin of wood. While Larix sibirica wood is the subject of many research, characteristics of Larix gmelinii still require additions. The main aim of this paper was to describe the technical properties of Dahurian larch wood. We characterised also the microstructure of the wood. Moreover, durability against fungi−caused brown rot was tested. The wood from the Chabarowsk area (Russia) was tested. The properties of wood were determined in accordance with the recom−mendations of the Polish standards. The obtained results allow to conclude that Dahurian larch wood is characterized by medium shrinkage and typical shrinkage anisotropy (total radial shrinkage was 5.0% and in the tangential direction 7.6%). With the average density of this wood in an air−dry state equal to 620 kg/m3, average mechanical properties are associated – modulus of elasticity 12.5 GPa and Janka hardness on the cross−section of 57 MPa. These values are similar to those of Siberian larch. Dahurian larch heartwoods is characterized by low durability (4th class of natural durability to fungi in a 5−degree scale). It causes that wood used in external environment require special attention and use of wood preservatives.
    Źródło:
    Sylwan; 2019, 163, 01; 47-54
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charakterystyka techniczna drewna limby syberyjskiej (Pinus sibirica Du Tour.)
    Characteristic technical properties of Siberian yellow pine (Pinus sibirica Du Tour.) wood
    Autorzy:
    Jankowska, A.
    Anders, B.
    Mastyna, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/986686.pdf
    Data publikacji:
    2017
    Wydawca:
    Polskie Towarzystwo Leśne
    Tematy:
    lesnictwo
    drzewnictwo
    limba syberyjska
    Pinus sibirica
    drewno limbowe
    charakterystyka techniczna
    wlasciwosci mechaniczne
    wlasciwosci fizyczne
    anatomia drewna
    odpornosc na biodegradacje
    siberian yellow pine
    mechanical and physical properties
    brown rot fungus
    wood anatomy
    Opis:
    Siberian yellow pine (Pinus sibirica Du Tour.) has increasingly appeared in the merchant offers on the market of raw wood materials in Poland. However, the knowledge of the technical characteristics of its wood is still insufficient for it is based primarily on the data and experiences from abroad, often from the literature of the former USSR. The main aim of this study was to determine selected physical and mechanical properties of Siberian yellow pine wood such as linear and volumetric shrinkage, compressive strength along the fibers, the tensile strength along the fibers, the tensile strength across the fibers, static bending and modulus of elasticity, flexural dynamic and impact strength, hardness, resistance to splitting and cleavage amd shear strength. Futhermore, the resistance to decay caused by Coniophora puteana (Schum., Fr.) Karst., as well as the examination of the wood structure, assessing the dimensions and arrangement of the structural elements in particular were conducted. The results show that Siberian yellow pine wood has a number of similarities to Scots pine wood in terms of the structure. The wood is very light, with a density of 391 kg/m3 and very soft (Janka hardness on transverse cross section 23 MPa). The mechanical properties of Siberian yellow pine wood are closely related to its density and much lower when compared with Scots pine. Shear strength equalled to 67 MPa, static bending strength – 65 MPa and compression strength along the fibers – 49 MPa. The durability to brown rot fungus of Siberian pine wood is comparable to Scots pine (3rd class according to PN−EN 350−2:2000).
    Źródło:
    Sylwan; 2017, 161, 09; 756-762
    0039-7660
    Pojawia się w:
    Sylwan
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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