Search for dissertations about: "delin, anna"

Showing result 1 - 5 of 11 swedish dissertations containing the words delin, anna.

  2. 1. Density functional calculations of optical spectra and narrow band systems

    Author : Anna Delin; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; Physics; Fysik; Fysik; Physics;

    Abstract : A calculational method, based on density functionaltheory, has been used to calculate optica spectra for a wide range of systems,as well as ground-state properties of some narrow-band systems. A systematic study of the trends in the optical properties of the 4Brefractory metal compounds has been performed. READ MORE

  4. 2. First principles study of oxide semiconductors for solar energy applications

    Author : Maofeng Dou; Clas Persson; Huda Muhammad N.; Sergey Simak; Anna Delin; Peter Johansson; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; photocatalysis; water splitting; oxynitrides; dielectric function; first-principles calculation; density functional theory; electronic structures; Casimir interaction; Teknisk materialvetenskap; Materials Science and Engineering;

    Abstract : The objectives of this thesis are to understand the electronic structures of oxides and oxynitrides for photocatalytic water splitting, examine the Casimir interaction between oxides, and explore possible approach to bridge the Casimir force and material properties for advanced material research. The studies were performed in the framework of the density functional theory, many-body perturbation theory, i. READ MORE

  5. 3. Density Functional Theory Calculations for Graphene-based Gas Sensor Technology

    Author : Karim Elgammal; Anna Delin; Giuseppe Iannaccone; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; graphene; ab-initio; humidity; carbon dioxide; substrate; DFT; vdW; first-principle; simulation; calculations; Fysik; Physics;

    Abstract : Nowadays, electronic devices span a diverse pool of applications, especially when getting smaller and smaller satisfying the more than Moore paradigm. To further develop this, studies focusing on material design toward electronic devices are crucial. READ MORE

  6. 4. Density Functional Theory Calculations of Graphene based Humidity and Carbon Dioxide Sensors

    Author : Karim Elgammal; Anna Delin; Biplab Sanyal; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; DFT; graphene; sensors; Quantum Espresso; ab-initio; Fysik; Physics;

    Abstract : Graphene has many interesting physical properties which makes it useful for plenty of applications. In this work we investigate the possibility of using graphene as a carbon dioxide and humidity sensor. READ MORE

  7. 5. Titled and graded anisotropy FePt and FePtCu thin films for the application of hard disk drive and spin torque oscillators

    Author : Yeyu Fang; Johan Åkerman; Anna Delin; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik;

    Abstract :  The FePt and FePtCu thin films with graded anisotropy and titled anisotropy are utilized to solve both the magnetic recording ‘‘trilemma’’ of the hard disk drives (HDDs) and the large field operation problem of spin torque oscillators (STOs). We have successfully realized the FePtCu thin films with graded anisotropy. READ MORE