Sökning: "products structures"

Visar resultat 16 - 20 av 407 avhandlingar innehållade orden products structures.

  1. 16. Environmental Impact of Concrete Structures - with Focus on Durability and Resource Efficiency

    Författare :Nadia Al-Ayish; Folke Björk; Kjartan Gudmundsson; Katarina Malaga; Otto During; Katja Fridh; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Life cycle assessment; environmental impact; concrete structures; resource efficiency; durability; supplementary cementitious materials; Byggvetenskap; Civil and Architectural Engineering;

    Sammanfattning : Concrete is essential for the construction industry with characteristic properties that make it irreplaceable in some aspects. However, due to the large volumes consumed and the energy intense cement clinker production it also has a notable climate impact. LÄS MER

  3. 17. Mechanical behaviour of hardwoods : effects from cellular and cell wall structures

    Författare :Ingela Bjurhager; Lars Berglund; Ingo Burgert; Magnus Wålinder; KTH; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Wood fibre and forest products; Träfiber- och virkeslära;

    Sammanfattning : Syftet med den här avhandlingen var att undersöka mekaniska egenskaper hos olika arter av lövträd, och koppla egenskaperna till cell- och cellväggsstrukturen i materialet. Arterna som omfattades av undersökningen var Europeisk asp (Populus tremula), hybridasp (Populus tremula x Populus tremuloides) och ek (Quercus robur). LÄS MER

  4. 18. Studies on lignin hydrolysis products and their relations to lignin structures

    Författare :Knut Lundquist; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : .... LÄS MER

  5. 19. Synthetic studies of heterocyclic natural products

    Författare :Jeffrey J Mason; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Heterocycles; alkaloids; natural products; luotonin A; cephalandole A; cephalandole B; benzoxazinone; tryptanthrin; ophiuroidine; pyrroloquinazolinone; isatin; Prey demethylation; pyridinium hydrochloride; demethylation; microwave synthesis;

    Sammanfattning : The methods that were developed for the synthesis of the heterocyclic natural products luotonin A, ophiuroidine, cephalandole B, and the indol-3-yl-benzoxazinones of cephalandole A are described in this thesis. The reoccurrence of the 4(3H)-quinazolinone structure is a common theme throughout these studies, and an overview of some quinazoline chemistry is introduced in the first chapter. LÄS MER

  7. 20. Halogenated structures in natural organic matter

    Författare :Carina Johansson; Linköpings universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN;

    Sammanfattning : Chloroorganics have long been assumed to be almost exclusively of anthropogenic origin, and this assumption has played an important role in the public debate regarding the use of chloriue and emissions of chlorine-containing organic compounds. However, studies undertaken during the past decade have demonstrated that, in general, the total amounts of organically bound chloriue in soil and water by far exceed the possible anthropogenic input. LÄS MER