Sökning: "Sven Andersson"

Visar resultat 16 - 20 av 32 avhandlingar innehållade orden Sven Andersson.

  1. 16. Electron-Lattice Dynamics in pi-Conjugated Systems

    Författare :Magnus Hultell (Andersson); Sven Stafström; Alexander Onipko; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Polaron dynamics; Exciton dynamics; pi-conjugated systems; Su-Schrieffer-Heeger SSH model; Adiabaticity; Charge carrier transport; Organic electronics.; Computational physics; Beräkningsfysik;

    Sammanfattning : In this thesis we explore in particular the dynamics of a special type of quasi-particle in pi-conjugated materials termed polaron, the origin of which is intimately related to the strong interactions between the electronic and the vibrational degrees of freedom within these systems. In order to conduct such studies with the particular focus of each appended paper, we simultaneously solve the time-dependent Schrödinger equation and the lattice equation of motion with a three-dimensional extension of the famous Su-Schrieffer-Heeger (SSH) model Hamiltonian. LÄS MER

  3. 17. Electron-lattice dynamics in π-conjugated systems

    Författare :Magnus Hultell (Andersson); Sven Stafström; Alessandro Troisi; Linköpings universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; charge transport; electron-lattice dynamics; polaron; adiabatic transport; electron localization; internal conversion; Computational physics; Beräkningsfysik;

    Sammanfattning : The work presented in this thesis concerns the dynamics in π-conjugated hydrocarbon systems. Due to the molecular bonding structure of these systems there exists a coupling between the electronic system and the phonons of the lattice. LÄS MER

  4. 18. När förskolan möter neurovetenskap : Kunskapsteoretiska möten i teori och i praktik

    Författare :Lena Aronsson; Hillevi Lenz Taguchi; Annika Andersson; Sven Persson; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; neuroeducation; educational neuroscience; Swedish preschool; early childhood education; cartographic mapping; neuropedagogik; pedagogisk neurovetenskap; svensk förskola; förskoledidaktik; kartografiskt spårande; Early Childhood Education; förskoledidaktik;

    Sammanfattning : This doctoral thesis in Early Childhood Education reports on encounters between the theories and practices of Swedish preschool and research-based neuroscience knowledge. Thus, this thesis concerns epistemological encounters and didactic consequences. LÄS MER

  5. 19. Assessing the effects of societal injury control interventions

    Författare :Carl Bonander; Ragnar Andersson; Sven Bremberg; Karlstads universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; causal inference; epidemiology; injury; time series analysis; impact evaluation; Risk and Environmental Studies; Risk- och Miljöstudier;

    Sammanfattning : Injuries have emerged as one of the biggest public health issues of the 21th century. Yet, the causal effects of injury control strategies are often questioned due to a lack of randomized experiments. LÄS MER

  7. 20. Teachers' Retention in Tanzanian Remote Secondary Schools : Exploring Perceived Challenges and Support

    Författare :Raymond Boniface; Martin Stigmar; Jan Håkansson; Christer Ohlin; Sven Andersson; Linnéuniversitetet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Challenges; Organizational Support; Remote Schools; Secondary Education; Support; Teacher Retention; Tanzania; Education; Pedagogik;

    Sammanfattning : Teacher retention is a global challenge, and many developed and developing countries are struggling to staff and retain teachers in schools, particularly in low-performing, remote, and less desirable areas. In most of these countries, Tanzania in particular, the efficacy of fiscally inclined teachers’ retention strategies continues to be dubious. LÄS MER