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Showing result 6 - 10 of 33 essays matching the above criteria.

  1. 6. Micromechanical modelling of creep in wooden materials

    University essay from Uppsala universitet/Tillämpad mekanik

    Author : Oskar Falkeström; Kevin Coleman; Malin Nilsson; [2021]
    Keywords : Creep; RVE; Homogenization; Honeycomb; Tracheid; Comsol Multiphysics; Micromechanical modelling; Orthotropic; Parametric study; S2 material; Norwegian Spruce; Scots Pine; Cell geometry;

    Abstract : Wood is a complex organic orthotropic viscoelastic material with acellular structure. When stressed, wood will deform over timethrough a process called creep. Creep affects all wooden structureand can be difficult, time-consuming and expensive to measure. For this thesis, a simple computer model of the woodenmicrostructure was developed. READ MORE

  3. 7. Biomimetically improved materials comprising microfibrillated cellulose

    University essay from Umeå universitet/Kemiska institutionen

    Author : Cornelia Byström; [2021]
    Keywords : ;

    Abstract : Microfibrillated cellulose (MFC) is a renewable, cellulosic material mainly producedfrom wood fibers, which are found in the secondary cell walls of plant cells. With theincreased demand for renewable biopolymer films in packaging, MFC has emerged asa potential alternative to non-renewable polymer films. READ MORE

  4. 8. Lagring av skogsflis med och utan täckning : substansförlusters påverkan av nederbörd och vind

    University essay from SLU/Dept. of Energy and Technology

    Author : Daniel Wetterholm; [2021]
    Keywords : biobränsle; bränslekvalitet; substansförluster; fukthalt; data analys; lagring;

    Abstract : In the supply chain for wood chips, storage is a neccesary part due to seasonal demand. During storage there are several mechanisms occuring, cell respiration, biological degradation and thermo-chemical oxidative reaction. All of the mentioned mechanisms lead to increased temperature, loss of dry matter and energy. READ MORE

  5. 9. Optimizing Growth Conditions for Lactic Acid Bacteria

    University essay from Lunds universitet/Kemiteknik (CI)

    Author : Lorenzo García Tejada; [2021]
    Keywords : Lactic Acid Bacteria; Optimization; Cell growth; Lactic acid production; Oxygen; Yeast extract; Wood hydrolysate; Poly-lactic acid; Chemical engineering; Technology and Engineering;

    Abstract : High production titers are paramount in lactic fermentation processes aimed towards poly lactic acid (PLA) manufacturing. Optimization of the fermentation stage is therefore essential for the viability of the process. READ MORE

  6. 10. Stabilisation of arsenic in contaminated soil using iron distributed by electricity

    University essay from Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurser

    Author : Kajsa Engström; [2021]
    Keywords : Chemical stabilisation; soil remediation; contaminated soil; in situ pilot scale; sacrificial iron;

    Abstract : In Boden, northern part of Sweden, there is a site called Solgårdarna which has been used for wood impregnation. The activities on the site have led to soil contamination with chrome (Cr), copper (Cu) and arsenic (As), where the arsenic contamination is the most problematic. READ MORE