Sökning: "dielectric function"

Visar resultat 6 - 10 av 77 avhandlingar innehållade orden dielectric function.

1. 6. Optical modelling of conjugated polymers : from materials to devices

   Författare :Nils-Krister Persson; Andy Monkman; Linköpings universitet; []
   Nyckelord :Spectroscopic ellipsomctry; optical modelling; organic solar cell; conjugated polymer; polyfluorene; polythiophene; copolymer; fullerene blend; photovoltaic device; dielectric function; NATURAL SCIENCES; NATURVETENSKAP;

   Sammanfattning : Measurements and modelling of theoretical properties of polymer-based photovoltaic devices, PPVDs, are the subjects of this thesis. Modelling refers both to modelling of materials, based on extraction of the dielectric function, and to modelling of devices by computer simulation of the optical electrical field inside PPVDs. LÄS MER

3. 7. Statistical Mechanical Studies of Aqueous solutions and Biomolecular Systems

   Författare :Fernando Luis Barroso Da Silva; Beräkningskemi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; highly charged macromolecules; dielectric discontinuity; dissociation constant; Tanford-Kirkwood model; protein mutation; electrostatic interactions; chemical potential; titration; biomolecules; computer simulations; radial distribution function; electrolyte solutions; continuum model.; Theoretical chemistry; quantum chemistry; Teoretisk kemi; kvantkemi;

   Sammanfattning : This thesis is concerned with theoretical studies of aqueous solutions and biomolecular systems. Part of the present work is to understand equilibrium solvent and solute properties, while the other part is to study processes that occur in these solutions. LÄS MER

4. 8. Metal Gate Technology for Advanced CMOS Devices

   Författare :Gustaf Sjöblom; Jörgen Olsson; Stefan de Gendt; Uppsala universitet; []
   Nyckelord :Electronics; metal gate; high-k dielectrics; titanium nitride; zirconium nitride; MOSFET; thin film; work function; XPS; Elektronik;

   Sammanfattning : The development and implementation of a metal gate technology (alloy, compound, or silicide) into metal-oxide-semiconductor field effect transistors (MOSFETs) is necessary to extend the life of planar CMOS devices and enable further downscaling. This thesis examines possible metal gate materials for improving the performance of the gate stack and discusses process integration as well as improved electrical and physical measurement methodologies, tested on capacitor structures and transistors. LÄS MER

5. 9. Moment Method Analysis of Antennas in Reverberation Chambers and Cylindrical Structures

   Författare :Ulf Carlberg; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cavity; spectral domain method; cylindrical structure; Ewald summation; Green s function; absorption cross section; moment method; reverberation chamber; antenna;

   Sammanfattning : This thesis is a collection of papers using the method of moments for numerical analysis. The papers can be divided into two main groups; a study of antennas in reverberationchambers, and a study of antennas in cylindrical structures.The reverberation chamber is a metal cavity for measuring antennas and other devices. LÄS MER

7. 10. Moment Method Analysis of Antennas in Reverberation Chambers and Cylindrical Structures

   Författare :Ulf Carlberg; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; antenna; spectral domain method; reverberation chamber; Ewald summation; moment method; cavity; cylindrical structure; Green s function; absorption cross section;

   Sammanfattning : This thesis is a collection of papers using the method of moments for numerical analysis. The papers can be divided into two main groups; a study of antennas in reverberation chambers and a study of antennas in cylindrical structures.The reverberation chamber is a metal cavity for measuring antennas and other devices. LÄS MER