Search for dissertations about: "Teknisk fysik"

Showing result 1 - 5 of 499 swedish dissertations containing the words Teknisk fysik.

  1. 1. Photoelectron spectroscopic studies of deposited metal clusters and model catalyst systems

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Staffan Andersson; Uppsala universitet.; [1998]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik; fysik; Physics;

    Abstract : Metal clusters are small metal aggregates between atomic and metal systems. Their physical and chemical properties have been observed to change with size. Their surface fraction is large which makes them of particular interest for catalysis. Most presently used catalyst systems consist of small metal particles on porous oxide supports. READ MORE

  2. 2. Elastic properties and structural stabilities of elements and compounds

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Lars Fast; Uppsala universitet.; [1998]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik; fysik; Physics;

    Abstract : A first principles study of the elastic and structural properties of selected elements and compounds is presented. The theoretical basis for these investigations is the density functional theory, in combination with a full potential linear muffin-tin orbital method. READ MORE

  3. 3. Studies of ionised atoms with collision-based spectroscopy and laser spectroscopy

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Mingqi Wang; Uppsala universitet.; [1997]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik; fysik; Physics;

    Abstract : Atomic structure and collision properties of ionised atoms have been studied usingcollision-based spectroscopy and fast ion beam-laser spectroscopy.Collision induced photon emission spectra of Xe VI, Xe VII and Xe VIII andthe potassium like metal ions Mn VII, Fe VIII and Co IX have been recorded with a beam of multiply charged ions from an ECR (electron cyclotron resonance) ion source passing through an atomic target. READ MORE

  4. 4. Determining and Optimizing the Current and Magnetic Field Dependence of Spin-Torque and Spin Hall Nano-Oscillators Toward Next-Generation Nanoelectronic Devices and Systems

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Seyed Amir Hossein Banuazizi; Johan Åkerman; Erik Wahlström; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; nanoelectronics; spintronics; nanomagnetism; ferromagnetic materials; microwave oscillators; magnetization dynamics; spin waves; giant magneto-resistance; spin Hall effect; spin-torque nano-oscillators; spin Hall nano-oscillators; numerical modeling; electrical characterization; microwave characterization; magnetic force microscopy.; Physics; Fysik; Materials Science and Engineering; Teknisk materialvetenskap; Informations- och kommunikationsteknik; Information and Communication Technology; Electrical Engineering; Elektro- och systemteknik;

    Abstract : Spin-torque and spin Hall nano-oscillators are nanoscale devices (about 100 nm) capable of producing tunable broadband high-frequency microwave signals ranging from 0.1 GHz to over 65 GHz that several research groups trying to reach up to 200 - 300 GHz. READ MORE

  5. 5. The optical properties of automatically darkening welding filters based on liquid crystal technology

    University dissertation from Uppsala : Acta Universitatis Upsaliensis

    Author : Stephen Palmer; Uppsala universitet.; [1998]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; NATURAL SCIENCES Physics; NATURVETENSKAP Fysik; Solid State Physics; fasta tillståndets fysik;

    Abstract : This thesis addresses the problem of the poor optical angular properties displayed by automatically darkening welding filters that are based on liquid crystal technology. It is shown that by reducing thetwist-angle present in the liquid crystal cell to below that of 90° together with employment of a novel polariser arrangement, an optical shutter design using a double-cell construction is obtained thatpossesses a reduced angular transmittance variation when in the activated phase. READ MORE