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Visar resultat 16 - 20 av 195 avhandlingar som matchar ovanstående sökkriterier.

1. 16. Development, validation and application of advanced neuroimaging analysis tools for in vivo neuroreceptor studies

   Författare :Zsolt Cselényi; Karolinska Institutet; Karolinska Institutet; []
   Nyckelord :PET; neuroreceptor; multi-receptor analysis; kinetic analysis; parametric imaging; wavelet filtering; artificial neural network; unsupervised cluster analysis;

   Sammanfattning : Positron emission tomography (PET) is an imaging technology, which can be used to study neuroreceptors in the human brain in vivo. The technique estimates the regional binding of radiolabelled ligands to neuroreceptors and the data are commonly displayed as images showing the distribution of radioactivity in the brain volume. LÄS MER

3. 17. Inference techniques for stochastic nonlinear system identification with application to the Wiener-Hammerstein models

   Författare :Giuseppe Giordano; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; nonlinear systems; system identification; stochastic; Maximum Likelihood; Wiener-Hammerstein; Monte Carlo; Newton s method;

   Sammanfattning : Stochastic nonlinear systems are a specific class of nonlinear systems where unknown disturbances affect the system's output through a nonlinear transformation. In general, the identification of parametric models for this kind of systems can be very challenging. LÄS MER

4. 18. Fluid Dynamics of the Transport Zone of Circulating Fluidized Beds - with Application to Boilers

   Författare :Wennan Zhang; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fluid dynamics; particle flux probe; momentum probe; circulating fluidized bed boilers; circulating fluidized beds; particle flow pattern; particle concentration probe; spectrum analysis;

   Sammanfattning : The particle suspension flow structure in circulating fluidized beds (CFB) was studied with emphasis on the layer of downflowing particles at the wall. The main experiments were carried out in the furnace of the 12 MWth CFB boiler of 1.7x1.7 m cross-section, and in a two-dimensional CFB cold bed of 0. LÄS MER

5. 19. A Damage-Based Interface Model: Application to the Degradation and Failure of a Polycrystalline Microstructure

   Författare :Patrik Cannmo; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; damage; polycrystalline microstructure; degradation; slip and dilatation; interfaces; FE-calculations; viscoplasticity; plasticity; failure;

   Sammanfattning : A constitutive model for material interfaces is presented. The model is based on damage coupled to plastic (or viscoplastic) slip and dilatation, and it is able to describe the successive degradation and failure of an interface. LÄS MER

7. 20. Traitement de l'interaction spin-orbite en chimie quantique et application à la réactivité des complexes d'actinides

   Författare :Emmanuel Fromager; Ulf Wahlgren; Christian Teichteil; Michael Dolg; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; quantum chemistry; actinides; charge transfer reactions; spin-orbit effects; Physics; Fysik;

   Sammanfattning : The recent methodological developments and the advent of faster computers enable nowadays to investigate theoretically the chemical reactivity of heavy element complexes. As an example we can mention actinide chemistry which is involved in the separation of nuclear wastes. LÄS MER