Sökning: "Tomas Johansson"

Visar resultat 6 - 10 av 27 avhandlingar innehållade orden Tomas Johansson.

  1. 6. Electroactivity of conjugated polymers : A study of electrochemical doping and its applications

    Författare :Tomas Johansson; Carita Kvarnström; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Electrochemical doping of conjugated polymers is a complex process, which forms the basis for both characterisation and applications of this class of materials. The high electron affinityof poly(quinoxaline vinylene)s and poly(pyridopyrazine)s, two types of polymers with potential use as electron acceptors in organic photodiodes, has been demonstrated with cyclic voltamrnetry. LÄS MER

  3. 7. Reconstruction of a stationary flow from boundary data

    Författare :Tomas Johansson; Lars-Erik Andersson; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Cauchy problem; Generalized Stokes system; Ill-posed problems;

    Sammanfattning : We study a Cauchy problem arising in uid mechanics, involving the socalled stationary generalized Stokes system, where one should recover the ow from boundary measurements. The problem is ill-posed in the sense that the solution does not depend continuously on data.Two iterative procedures for solving this problem are proposed and investigated. LÄS MER

  4. 8. Reconstruction of flow and temperature from boundary data

    Författare :Tomas Johansson; Vladimir Kozlov; George Bastay (Baravdish); Jürgen Rossmann; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Partiella differentialekvationer; Operatorteori;

    Sammanfattning : In this thesis, we study Cauchy problems for elliptic and parabolic equations. These include the stationary Stokes system and the heat equation. Data are given on a part of the boundary of a bounded domain. The aim is to reconstruct the solution from these data. LÄS MER

  5. 9. Core-hole Clock Spectroscopy Using Hard X-rays : Exciting States in Condensed Matter

    Författare :Fredrik Johansson; Andreas Lindblad; Carla Puglia; Tomas Edvinsson; Marc Simon; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; core-hole clock; resonant Auger; XPS; black phosphorous; TMDC; perovskite; graphene; coincidences spectroscopy; synchrotron radiation; HAXPES;

    Sammanfattning : This thesis is about how electrons move from one place to another, that is charge transfer dynamics. Charge transfer dynamics is an important property governing chemical and physical changes that form the base for many applications such as electronics, optoelectronics and catalysis. LÄS MER

  7. 10. Predator effects on behaviour and life-history of prey

    Författare :Tomas Brodin; Frank Johansson; Bradley Anholt; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; activity; behaviour; behavioural syndromes; damselfly; development; growth; life-history; predator-prey interaction; predation risk; thinning; Freshwater ecology; Limnisk ekologi;

    Sammanfattning : In this thesis I investigate predator-induced effects on behavioural and life-history characteristics of prey. At any moment a given predator is capable of attacking a small number of prey. LÄS MER