Sökning: "Current sheets"

Visar resultat 1 - 5 av 42 avhandlingar innehållade orden Current sheets.

1. 1. 3D Magnetic Nulls and Regions of Strong Current in the Earth's Magnetosphere

   Författare :Elin Eriksson; Andris Vaivads; Hans Nilsson; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Magnetic Nulls; Particle Acceleration; Current sheets; Magnetic reconnection; Magnetosphere; Fysik med inriktning mot rymd- och plasmafysik; Physics with specialization in Space and Plasma Physics;

   Sammanfattning : Plasma, a gas of charged particles exhibiting collective behaviour, can be found everywhere in our vast Universe. The characteristics of plasma in very distant parts of the Universe can be similar to characteristics in our solar system and near-Earth space. LÄS MER

3. 2. Iron Losses in Electrical Machines - Influence of Material Properties, Manufacturing Processes, and Inverter Operation

   Författare :Andreas Krings; Juliette Soulard; Oskar Wallmark; Annette Mütze; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; AC machines; cobalt-iron; eddy current losses; electrical steel sheets; inverter-fed machines; iron alloys; iron loss measurements; machine design; magnetic hysteresis; magnetic losses; magnetic materials; nickel-iron; permanent magnet machines; silicon-iron; soft magnetic composites; slot-less machines; soft magnetic materials; thermal effects.; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : As the major electricity consumer, electrical machines play a key role for global energy savings. Machine manufacturers put considerable efforts into the development of more efficient electrical machines for loss reduction and higher power density achievements. LÄS MER

4. 3. Computational Insights on Functional Materials for Clean Energy Storage : Modeling, Structure and Thermodynamics

   Författare :Tanveer Hussain; Rajeev Ahuja; Caetano R. Miranda; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Density functional theory; Molecular dynamics; Hydrogen storage; Chemisorption; Physisorption; Functionalization; Physics with spec. in Atomic; Molecular and Condensed Matter Physics; Fysik med inriktning mot atom- molekyl- och kondenserande materiens fysik;

   Sammanfattning : The exponential increase in the demands of world’s energy and the devastating effects of current fossil fuels based sources has forced us to reduce our dependence on the current sources as well as finding cleaner, cheaper and renewable alternates. Being abundant, efficient and renewable, hydrogen can be opted as the best possible replacement of the diminishing and harmful fossil fuels. LÄS MER

5. 4. Reaction patterns of the Swedish economy : an econometric analysis

   Författare :Efthimios Kottas; Stockholms universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES;

   Sammanfattning : The objective of the study is to analyze the reaction patterns of the Swedish economy using amacroeconometric model.The model constructed and estimated for this purpose is a medium-size, quarterly, nonlinear modeland consists of 241 equations, 90 of which are estimated or constructed behavioral equations and therest identities or definitional equations. LÄS MER

7. 5. Computational studies of DNA sequencing with graphene nanopores

   Författare :Lijun Liang; Yaoquan Tu; Alexander Lyubartsev; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; DNA sequencing; Graphene nanopore; Molecular dynamic simulation; Kemi; Chemistry;

   Sammanfattning :     The aim of DNA sequencing is to obtain the order of DNA composition comprising the base pairs A (adenine) T (thymine), and C (cytosine) G (guanine). The fast development of DNA sequencing technology allows us to better understand the relationships among diseases, inheritance, and individuality. LÄS MER