Sökning: "Torbjörn eriksson"
Visar resultat 1 - 5 av 11 avhandlingar innehållade orden Torbjörn eriksson.
1. Rationella tal som tal : Algebraiska symboler och generella modeller som medierande redskap
Sammanfattning : In this study the teaching of mathematics has been developed in relation to rational numbers and towards a learning activity. At the same time topic-specific mediated tools have been studied. The iterative model for learning study has been used as research approach. LÄS MER
2. Det reglerade undantaget : högerns jordbrukspolitik 1904-2004
Sammanfattning : Agricultural policy and protectionism were major forces behind the foundation of the Swedish Conservative Party (AVF, later Högerpartiet and now Moderata samlingspartiet). Agriculture was seen as a traditional way of life and as such agriculture was deemed important enough to be protected by tariffs. LÄS MER
3. Structural Changes in Lithium Battery Materials Induced by Aging or Usage
Sammanfattning : Li-ion batteries have a huge potential for use in electrification of the transportation sector. The major challenge to be met is the limited energy storage capacity of the battery pack: both the amount of energy which can be stored within the space available in the vehicle (defining its range), and the aging of the individual battery cells (determining how long a whole pack can deliver sufficient energy and power to drive the vehicle). LÄS MER
4. Magnetic and Structural Properties of f-electron Systems from First Principles Theory
Sammanfattning : A series of studies of f-electron systems based on density functional theory methods have been performed. The focus of the studies has been on magnetic and structural properties, as well as investigating ways to handle strong electron correlation in these systems. LÄS MER
5. Battery Integrated Modular Multilevel Converter Topologies for Automotive Applications
Sammanfattning : Electric vehicles are rapidly developing in response to the need for increasing sustainable energy sources. The range and lifetime of an electric vehicle are limited by the battery pack. A pack comprises modules with several parallel and/or series-connected cells. LÄS MER