Sökning: "Direct"

Visar resultat 1 - 5 av 4826 avhandlingar innehållade ordet Direct.

  1. 1. Enhancing Direct Searches for Dark Matter : Spatial-Temporal Modeling and Explicit Likelihoods

    Författare :Bart Eduard Jan Pelssers; Jan Conrad; Jochen Schieck; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Dark matter; direct detection; statistical analysis; fysik; Physics;

    Sammanfattning : Astronomical and cosmological observations on different scales point to the existence of dark matter. In the current cosmological paradigm this dark matter accounts for about 26% of the energy-density of the universe, yet has not been directly observed. LÄS MER

  2. 2. On direct hydrogen fuel cell vehicles : modelling and demonstration

    Författare :Kristina Haraldsson; Per Alvfors; Dougal J. Nelson; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Chemical engineering; direct hydrogen; Proton Exchange Membrane; PEM; fuel cell; fuel cell vehicle; fuel cell hybrid vehicles; on-board hydrogen storage; Kemiteknik; Chemical engineering; Kemiteknik;

    Sammanfattning : In this thesis, direct hydrogen Proton Exchange Membrane (PEM) fuel cell systems in vehicles are investigated through modelling, field tests and public acceptance surveys. A computer model of a 50 kW PEM fuel cell system was developed. The fuel cell system efficiency is approximately 50% between 10 and 45% of the rated power. LÄS MER

  3. 3. Upptäckten av Sverige : utländska direktinvesteringar i Sverige 1895-1945

    Författare :Sven Nordlund; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; direct investments; subsidiaries; tariffs; imperialism; multinational companies; cartels; Jewish refugee capital; dummy companies; small industrial countries;

    Sammanfattning : The study investigates the extent, development and nature of foreign direct investments in Sweden during the years 1895-1945. The work also has a qualitative aspect, which may be summarized as a question: Why do foreign companies undertake direct investments in Sweden? The basic premise has been that the companies' decisions are based on their own calculations regarding profit interests and structural conditions on the market, but these decisions are also influenced by various power relations. LÄS MER

  4. 4. Direct electron transfer based biofuel cells : operating in vitro and in vivo

    Författare :Magnus Falk; Malmö högskola; []
    Nyckelord :biofuel cell; direct electron transfer; enzymes; gold nanoparticles; implantable biomedical devices;

    Sammanfattning : I vår moderna värd är vi väldigt beroende av elektrisk energi som vi använder för det mesta i får vardag: för att lysa upp våra hus, generera värme, driva våra datorer och mobiltelefoner och mycket mer. Produktion av elektrisk energi har dock ofta en negativ på-verkan på vår miljö. LÄS MER

  5. 5. Direct Conversion of Human Fibroblasts to Induced Neurons

    Författare :Ulrich Pfisterer; Utvecklings- och regenerativ neurobiologi; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Cellular Reprogramming; Direct Conversion; Human Induced Neurons; Dopaminergic; Cell Replacement Therapy; Lentiviral Vectors;

    Sammanfattning : During direct cellular reprogramming, forced expression of key transcription factors (TFs) directly converts one terminally differentiated cell type into that of another fate, exemplified in this theses by the conversion of fibroblasts into functional induced neurons (iNs). Direct conversion of mouse fibroblasts to functional neurons was established in 2010, and the starting point of my doctoral thesis was the aim to transfer iN-technology to human cells and to explore the potential of this technique in regards to generate subtype-specific neurons as well as to use these cells for transplantation studies. LÄS MER