Sökning: "Örjan Olsson"

Hittade 5 avhandlingar innehållade orden Örjan Olsson.

  1. 1. Atomic and Electronic Structure of III-V Semiconductor Surfaces

    Författare :Örjan Olsson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; semiconductor; GaAs; photoelectron; scanning tunneling microscopy; valence band; core level; reconstruction; InAs; surface; InSb;

    Sammanfattning : The atomic and electronic structure of clean and Cs-perturbed III-V semiconductors was studied by angle-resolved photoelectron spectroscopy (ARPES), surface core level spectroscopy (SCLS), and scanning tunneling microscopy (STM). The work can be divided into three parts, dealing with low-index sur-faces, high-index surfaces, and special features of InAs. LÄS MER

  3. 2. Electronic properties of narrow bandgap semiconductor surfaces studied by photoelectron spectroscopy

    Författare :Örjan Olsson; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; InAs; InSb; electronic; core level; valence band; photoelectron; surface; semiconductor;

    Sammanfattning : .... LÄS MER

  4. 3. Studies of physical activity in the Swedish population

    Författare :Sven Johan Gustav Olsson; Mats Börjesson; Örjan Ekblom; Lena Kallings; Mikael Fogelholm; Gymnastik- och idrottshögskolan; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; physical activity; physical fitness; sedentary; questionnaire; validity; self-rated health; sensitivity; specificity; physical activity on prescription; accelerometry; the Ekblom-Bak test; answer modes; movement pattern; health-related quality of life; physical health; Medicin Teknik; Medicine Technology;

    Sammanfattning : Background: Cheap and effective tools for measuring patients’ physical activity (PA) level are needed. The first aim in this thesis was therefore to assess the validity of two PA -questions, and their three associated answer modes, that are used within the Swedish health care system. LÄS MER

  5. 4. Fabrication and Characterization of Si-on-SiC Hybrid Substrates

    Författare :Ling-Guang Li; Jörgen Olsson; Örjan Vallin; Stefan Bengtsson; Uppsala universitet; []
    Nyckelord :hydrophilic wafer bonding; silicon on silicon carbide; hybrid substrate; oxygen out-diffusion; Engineering Science with specialization in Electronics; Teknisk fysik med inriktning mot elektronik;

    Sammanfattning : In this thesis, we are making a new approach to fabricate silicon on insulator (SOI). By replacing the buried silicon dioxide and the silicon handling wafer with silicon carbide through hydrophilic wafer bonding, we have achieved silicon on crystalline silicon carbide for the first time and silicon on polycrystalline silicon carbide substrates at 150 mm wafer size. LÄS MER

  7. 5. Design and Characterization of RF-LDMOS Transistors and Si-on-SiC Hybrid Substrates

    Författare :Sara Lotfi; Jörgen Olsson; Örjan Vallin; Jean-Pierre Raskin; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; LDMOS; RF; losses; crosstalk; silicon carbide; Si-on-SiC hybrid substrate; wafer bonding; CMOS; Teknisk fysik med inriktning mot elektronik; Engineering Science with specialization in Electronics;

    Sammanfattning : With increasing amount of user data and applications in wireless communication technology, demands are growing on performance and fabrication costs. One way to decrease cost is to integrate the building blocks in an RF system where digital blocks and high power amplifiers then are combined on one chip. LÄS MER