Search for dissertations about: "Helen"

Showing result 1 - 5 of 167 swedish dissertations containing the word Helen.

  2. 1. Oxidation and Reconstructions of Alloy Model Catalysts : Platinum-Rhodium and Palladium-Gold

    Author : Helen Edström; Synkrotronljusfysik; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Alloying; APXPS; Bimetallic Catalysts; Heterogeneous Catalysis; HESXRD; Oxidation; Oxide Formation; Palladium-Gold; Platinum-Rhodium; Surface Reconstruction; Fysicumarkivet A:2023 Edström;

    Abstract : Alloys and bimetallic systems have shown many advantages in heterogeneous catalysis, but the details of their catalytic functions are not always known. For instance, the atomic details about surface reconstructions under catalytic reaction conditions, or which phases that are high-active or low-active. READ MORE

  4. 2. Harmonisation of 3D geodata : a prerequisite for a digital information flow for applications in the planning and building sector

    Author : Helen Eriksson; Institutionen för naturgeografi och ekosystemvetenskap; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Data harmonisation; schema extension; 3D buildings; 3D city models; GeoBIM; lifecycle and version management; emporal information; user requirements; Guidelines; Hydrography;

    Abstract : Data harmonisation is a prerequisite for smart cities, for a more efficient information flow in the planning and building process and for many applications in the urban environment. Ideally, data harmonisation will result in a digital information flow that include information from the whole lifecycle of a feature, for example for buildings, roads and tunnels. READ MORE

  5. 3. Attenuation correction in pulmonary and myocardial single photon emission computed tomography

    Author : Helén Almquist; Lund Klinisk fysiologi; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Klinisk fysiologi; tomography; medical instrumentation; radiology; Clinical physics; downscatter; myocardial perfustion; ventilation-perfusion ratio; radiologi; pulmonary density; pulmonary perfusion; attenuation correction; SPECT; transmission measurement; tomografi; medicinsk instrumentering;

    Abstract : The objective was to develop and validate methods for single photon emission computed tomography, SPECT, allowing quantitative physiological and diagnostic studies of lung and heart. A method for correction of variable attenuation in SPECT, based on transmission measurements before administration of an isotope to the subject, was developed and evaluated. READ MORE

  6. 4. Analysis of domestic dog mitochondrial DNA sequence variation for forensic investigations

    Author : Helen Angleby; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Biotechnology; forensics; mtDNA; control region; hair; domestic dog; breed; Bioteknik; Bioengineering; Bioteknik;

    Abstract : The first method for DNA analysis in forensics was presented in 1985. Since then, the introduction of the polymerase chain reaction (PCR) has rendered possible the analysis of small amounts of DNA and automated sequencing and fragment analysis techniques have facilitated the analyses. READ MORE

  7. 5. On the deformation of cusp forms

    Author : Helen Avelin; Uppsala universitet; []
    Keywords : ;

    Abstract : .... READ MORE