Sökning: "Dielectric Functions"

Visar resultat 1 - 5 av 23 avhandlingar innehållade orden Dielectric Functions.

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

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Jailton Souza de Almeida; Rajeev Ahuja; Patrizia Monachesi; [2006]
    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

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

    Detta är en avhandling från Institutionen för elkraftteknik

    Författare :Anders Helgeson; [2000]
    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

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

    Detta är en avhandling från Institutionen för elkraftteknik

    Författare :Zvonimir Sipus; [1997]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; 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

  4. 4. Theoretical studies of collective electronic excitations in low-dimensional structures

    Detta är en avhandling från Institutionen för elkraftteknik

    Författare :Zhe Yuan; [2008]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; linear atomic chains; hydrogen storage; nanodisks; dielectric response; surface plasmon resonances; electron gas model; electronic excitation; metallic thin films; time-dependent density functional theory;

    Sammanfattning : During the past decade, nanoplasmonics and nanophotonicshas emerged as a new branch of nanosciences with many novelapplications. Central in this development is the localized surface plasmon resonance (LSPR) tunable by the sizes and shapes at nanometer scale. LÄS MER

  5. 5. Theoretical Investigation of the Effect of Interface Dielectric Properties on Electric Double Layer Interactions

    Detta är en avhandling från Göteborg : Göteborg University

    Författare :Erik Wernersson; Göteborgs universitet.; Gothenburg University.; [2008]

    Sammanfattning : Results for a simple model of interacting electric double layers are presented for the geometry of two parallel planar walls. The wall and solution media are described as dielectric continua, characterized by their frequency dependent dielectric functions. LÄS MER