Sökning: "earlywood"

Visar resultat 1 - 5 av 15 avhandlingar innehållade ordet earlywood.

  1. 1. The effect of raw material properties on pulping kinetics : an initial study of spruce sapwood

    Författare :Martin Kwasniewski; Chalmers University of Technology; []
    Nyckelord :density; FEM; hydroxide ion consumption; porosity; kinetics; digestion; latewood; pulping; 3D; earlywood; simulation; heat transport; surface area; cooking; pinus silvestris;

    Sammanfattning : .... LÄS MER

  2. 2. Structure and properties of Vasa oak

    Författare :Jonas Ljungdahl; Lars Berglund; Magnus Burman; Per Hoffmann; KTH; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; oak; archaeological wood; European oak; transverse anisotropy; Materials science; Teknisk materialvetenskap;

    Sammanfattning : The Vasa ship is not adequately supported. Measurements of the hull show that the ship deforms and rotate towards the port side. In addition, damages on the hull at support areas have been observed. The damages are due to high compressive loads. LÄS MER

  3. 3. Local variability in chemical and physical properties of spruce wood fibers

    Författare :Anna Bergander; KTH; []
    Nyckelord :cell walls; chemical composition; elastic constants; elastic strength; Fiber properties; Fibril angles; Mathematical models; Microscopy techniques; Picea Abies; Stiffness; Tensile properties; Wood polymers; Wood;

    Sammanfattning : Wood is well known to be a heterogeneous native materialwith large variations in its composite properties, includingvariations whose origins have not yet been completelyidentified. Traditionally, the macroscopic variations in woodhave received the most attention; for example, the variation indensity from the pith to the bark in trees. LÄS MER

  4. 4. Micromechanics of softwoods in the transverse plane : effects on cell and annual ring scales

    Författare :Carl S. Modén; Lars Berglund; Per Johan Gustafsson; KTH; []
    Nyckelord :AGRICULTURAL SCIENCES; LANTBRUKSVETENSKAPER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICIN OCH HÄLSOVETENSKAP; LANTBRUKSVETENSKAPER; MEDICAL AND HEALTH SCIENCES; AGRICULTURAL SCIENCES; Wood fibre and forest products; Träfiber- och virkeslära; Engineering mechanics; Teknisk mekanik; Biomaterials; Biomaterial;

    Sammanfattning : Transverse mechanical properties of wood are important in many practial applications and an interesting scientific subject. A very low transverse shear modulus has been identified in spruce, which causes large strain concentrations in wood structures. LÄS MER

  5. 5. Fracture behaviour of Green Wood (Pinus Sylvestris L.) : a composite materials approach

    Författare :Fredrik Thuvander; Luleå tekniska universitet; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Polymera konstruktionsmaterial; Polymeric Composite Materials;

    Sammanfattning : The fracture behaviour of green wood has been investigated using a composite materials approach. Through fracture experiments on miniature specimens, it was found that drying of wood leads to damage not only on the macro-level but also at the scale of the cell wall. LÄS MER