Sökning: "dielectric functions"

Visar resultat 1 - 5 av 26 avhandlingar innehållade orden dielectric functions.

  1. 1. There Is an Alloy at the End of the Rainbow: Structure and Optical Properties From Bulk to Nano

    Författare :Magnus Rahm; Chalmers University of Technology; []
    Nyckelord :NATURVETENSKAP; NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; ENGINEERING AND TECHNOLOGY; alloy cluster expansions; thermodynamics; alloys; hydrides; dielectric functions; nanoalloys; optical properties;

    Sammanfattning : Mixing different chemical species and decreasing dimensions to the nanoscale are two powerful approaches for improving materials. In both cases new properties emerge, and structure, composition, and chemical ordering can be tuned to tailor materials for specific purposes. LÄS MER

  2. 2. Designing and Tuning the Properties of Materials by Quantum Mechanical Calculations

    Författare :Jailton Souza de Almeida; Rajeev Ahuja; Patrizia Monachesi; Uppsala universitet; []
    Nyckelord :Physics; Density Functional Theory; Electronic Structure; Phase Transitions; High Pressure; Optical Properties; Dielectric Functions; Semiconductors; Metals; Fysik;

    Sammanfattning : In many materials, changes in chemical composition, pressure or temperature can induce metal to insulator transitions. It is recently observed in yttrium hydride, for example, changes from a shiny mirror (YH2) to a transparent window (YH3), which has important technological application in optical devices. LÄS MER

  3. 3. Analysis of dielectric response measurement methods and dielectric properties of resin-rich insulation during processing

    Författare :Anders Helgeson; KTH; []
    Nyckelord :;

    Sammanfattning : The dielectric diagnostic methods ofpolarisation/depolarisation currents and recovery voltage,which are time domain methods, and capacitance and tandmeasurements at different frequencies, which is a frequencydomain method, have been studied here. In the first part of thethesis, these measurement methods are analysed and evaluated. LÄS MER

  4. 4. Alloy Plasmonics - Fundamentals and Application in Catalysis

    Författare :Christopher Tiburski; Chalmers University of Technology; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; LSPR; dielectric function; gold; light; nanoparticles; nanofabrication; heterogeneous catalysis; nanoalloys; palladium; CO oxidation;

    Sammanfattning : Alloys have for a long time been important in the development of our society; from the bronze age, where man learned how to alloy copper with tin, to today, where many products are made of steel and aluminum alloys. Similarly, but maybe not as generally well known, also in heterogeneous catalysis alloys are explored to develop solutions to increase activity and selectivity of chemical processes. LÄS MER

  5. 5. Analysis of Planar and Circular Cylindrical Multilayer Structures with Application to Soft and Hard Surfaces

    Författare :Zvonimir Sipus; Chalmers University of Technology; []
    Nyckelord :antennas; periodic surfaces; integral equations; approximate boundary conditions; soft and hard surfaces; Green s functions; corrugated surfaces; moment method; periodic metal strips; multilayer structures; EFIE; microstrip antennas; spectral domain analysis; group representation theory; strip scatterers;

    Sammanfattning : This thesis deals with the analysis of planar and circular cylindrical multilayer structures, such as strip-loaded dielectric layers, corrugated surfaces and microstrip antennas. In particular, we study corrugations and strip-loaded grounded dielectric slabs when they are used to realize soft and hard surfaces. LÄS MER