Sökning: "hellsten"

Visar resultat 21 - 25 av 26 avhandlingar innehållade ordet hellsten.

1. 21. On Monte Carlo Operators for Studying Collisional Relaxation in Toroidal Plasmas

   Författare :Qaisar Mukhtar; Torbjörn Hellsten; Tainia Kurki-Suonio; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fusion plasma; thermonuclear fusion; tokamak; Coulomb collisions; stochastic differential equations with singular diffusion coefficients; Monte Carlo schemes; spatial diffusion; modelling; Fokker-Planck equation; RF-heating.;

   Sammanfattning : This thesis concerns modelling of Coulomb collisions in toroidal plasma with Monte Carlo operators, which is important for many applications such as heating, current drive and collisional transport in fusion plasmas. Collisions relax the distribution functions towards local isotropic ones and transfer power to the background species when they are perturbed e. LÄS MER

3. 22. The Parent–Teacher Encounter : A (mis)match between habitus and doxa

   Författare :Maria Mersini Pananaki; Carina Carlhed Ydhag; Meeri Hellstén; Petra Roll Bennet; Unn-Doris K. Bæck; Stockholms universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; parent–teacher encounter; social practice; parental school capital; collaboration; habitus; doxa; schooling field; pedagogik; Education;

   Sammanfattning : The aim of the thesis is to study how parents and teachers experience their encounter and how they negotiate their positions in the field of schooling with respect to legitimate knowledge claims about the child and the ideal form of home–school collaboration. The aim is operationalised through the following research questions: 1) How do parents and teachers utilise their social and cultural resources in their encounters? 2) How can certain resources function as forms of capital in relation to different practices in the field? 3) What practices do teachers and parents employ to preserve and/or subvert their relative positions in their encounters?  The theoretical framework is grounded in Pierre Bourdieu’s theory of practice and the main conceptual tools are habitus, capital and doxa. LÄS MER

4. 23. Assessment in Multilingual Schools : A comparative mixed method study of teachers’ assessment beliefs and practices among language learners - CLIL and migrant students

   Författare :Helena Reierstam; Ulf Fredriksson; Eva Eliasson; Meeri Hellstén; John Airey; Stockholms universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Assessment; content and language integrated learning; CLIL; newly-arrived students; teacher beliefs; language policy; academic language; subject content; fairness; equity; validity; pedagogik; Education;

   Sammanfattning : This thesis presents the results from two research projects on teachers’ assessment beliefs and practices in multilingual education. Study I involved teachers of biology, history or English as a foreign language (EFL) in Swedish upper secondary Content and Language Integrated Learning (CLIL) schools, grades 10-12, where English is used as the medium of instruction. LÄS MER

5. 24. The dynamics of Alfvén eigenmodes excited by energetic ions in toroidal plasmas

   Författare :Emmi Tholerus; Thomas Johnson; Torbjörn Hellsten; Duarte Borba; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fusion plasma physics; Tokamak; Wave–particle interactions; Toroidal Alfvén eigenmodes; Bump-on-tail instabilities; Magnetohydrodynamics; Nonlinear dynamics; Quasilinear dynamics; Hamiltonian mechanics; Monte Carlo method; ICRH; FWCD; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : The future fusion power plants that are based on magnetic confinement will deal with plasmas that inevitably contain energetic (non-thermal) particles. These particles come, for instance, from fusion reactions or from external heating of the plasma. LÄS MER

7. 25. The dynamics of Alfvén eigenmodes excited by energetic ions in toroidal plasmas

   Författare :Emmi Tholerus; Torbjörn Hellsten; Thomas Johnson; Lars-Göran Eriksson; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Fusion plasma physics; tokamak; wave-particle interactions; toroidal Alfvén eigenmodes; bump-on-tail instabilities; magnetohydrodynamics; nonlinear dynamics; quasilinear dynamics; Hamiltonian mechanics; Monte Carlo method; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : Experiments for the development of fusion power that are based on magnetic confinement deal with plasmas that inevitably contain energetic (non-thermal) particles. These particles come e.g. from fusion reactions or from external heating of the plasma. LÄS MER