Avancerad sökning

Visar resultat 1 - 5 av 8 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Identification of Viscoelastic Materials by Use of Wave Propagation Methods

    Författare :Saed Mousavi; Bengt Lundberg; Urmas Valdek; Janne Färm; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Engineering physics; Identification; Viscoelastic; Complex modulus; Complex Poisson s ratio; wave; Impact; Teknisk fysik; Engineering physics; Teknisk fysik;

    Sammanfattning : Complex moduli and Poisson’s ratio have been estimated using extensional and torsional wave experiments. The data were used for assessment of linearity and isotropy of two polymers, polymethyl methacrylate (PMMA) and polypropylene (PP). The responses of both materials were found to be close to linear and isotropic. LÄS MER

  3. 2. Properties in New Complex Perovskite-Related Materials, a Matter of Composition and Structure

    Författare :Samrand Shafeie; Gunnar Svensson; Jekabs Grins; John T. S. Irvine; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Perovskite; XANES; XRPD; NPD; TEC; TEM; SEM; TGA; SAED; HREM; thermal expansion; Seebeck coefficient; electronic conductivity; SOFC materials; magnetic susceptibility; Perovskit; XANES; XRPD; NPD; TEC; TEM; SEM; TGA; SAED; HREM; termisk expansion; Seebeck koefficient; elektrisk ledningsförmåga; SOFC material; magnetiska egenskaper; Materials Chemistry; materialkemi;

    Sammanfattning : This PhD thesis presents investigations of perovskite-related compounds in systems of interest for applications in components in solid oxide fuel cells. The compound compositions derive from substitutions in the parent compounds LaCoO3, LaCrO3 and SrFeO3. LÄS MER

  4. 3. Nye skabelsesberetninger om æg, sæd og embryoner : Et etnografisk studie af skabelser på sædbanker og fertilitetsklinikker

    Författare :Stine Adrian; Nina Lykke; Marit Melhuus; Linköpings universitet; []
    Nyckelord :Gender studies; Assisted reproduction; creation stories; material-discursive relations; agency; emotions; situated knowledges; nature culture; gender; ethnography; performativity; feminist new materialist theory; sexual dimorphism; Genusforskning; Assisterad befruktning; skapelseberättelser; materiellt-diskursiva relationer; agens; känslor; situated knowledges; natur kultur; kön; etnografi; performativitet; feministisk ny materialitesteori; visuella representationer; köns dimorfism;

    Sammanfattning : Avhandlingen handlar om användandet av assisterad befruktning i Danmark och Sverige. Teknologierna är intressanta eftersom de skapar möjligheter för barn att födas som annars inte skulle ha blivit till. De utmanar också normerande föreställningar om sexualitet, etnicitet, normalitet, ålder, kön och släktskap. LÄS MER

  5. 4. Design and characterization of nanoparticles and their assemblies : Transmission electron microscopy investigations from atomic to mesoscopic length scales

    Författare :Arnaud Mayence; Lennart Bergström; Liberato Manna; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; nanoparticles; electron microscopy; Materials Chemistry; materialkemi;

    Sammanfattning : Transmission electron microscopy (TEM) is a powerful and versatile tool for investigating nanomaterials. In this thesis, various transmission electron microscopy techniques are used to study the chemical and structural features of different types of inorganic nanoparticles of well-defined morphologies as well as their assemblies. LÄS MER

  7. 5. Carbon based Thin Films Prepared by HiPIMS and DCMS

    Författare :Susann Schmidt; Lars Hultman; Grzegorz Greczynski; Jörg Neidhardt; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : The present thesis focuses on carbon based thin films prepared by high power impulse magnetron sputtering (HiPIMS) and direct current magnetron sputtering (DCMS). The properties of such thin films can be tailored to an extensive variety; the film microstructure, for example, ranges in the presented work from fully amorphous, graphitic films to fullerene like (FL). LÄS MER