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Visar resultat 1 - 5 av 172 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Waves in space plasmas : Lower hybrid cavities and simple-pole distribution functions

   Författare :Anders Tjulin; Mats André; Hans Pécseli; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Space and plasma physics; space physics; plasma; waves; dispersion relations; lower hybrid cavities; Cluster; magnetosphere; Rymd- och plasmafysik; Space physics; Rymdfysik;

   Sammanfattning : Waves are a fundamental feature in many parts of physics, since they transport energy without transporting matter. This is the case also in space physics. Waves are responsible for energy transport both between different parts of space and between different particles in the space plasma. LÄS MER

3. 2. Space Plasma Dynamics : Instabilities, Coherent Vortices and Covariant Parametrization

   Författare :David Sundkvist; Jan-Erik Wahlund; Andris Vaivads; Stuart Bale; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Space and plasma physics; space physics; plasma; instabilities; turbulence; coherent structures; vortex; self-organization; magnetosphere; waves; electromagnetism; covariant; space instrumentation; Rymd- och plasmafysik; Space physics; Rymdfysik;

   Sammanfattning : The magnetospheric cusps are two funnel-like regions of Earth's magnetosphere where solar wind plasma can have direct access to the ionosphere. The cusps are very dynamic regions where wave-particle interactions continuously take place and redistribute energy among different particle populations. LÄS MER

4. 3. Presence Design : Mediated Spaces Extending Architecture

   Författare :Charlie Gullström; Katja Grillner; Halina Dunin-Woyseth; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Architectural design and theory; presence design; presence research; mediated space; mediated presence; remote presence; mediated interaction; audiovisually extended architecture; media space; design friction; hybrid space; virtual space; tele presence; transdisciplinary; mutual gaze; mediated gaze; spatial montage; tertium quid; active spectatorship; shared mediated space; offscreen space; lateral and peripheral awareness; framing; transparency.; Architecture; Arkitektur; Human communication; Kommunikation mellan människor; Telecommunication; Telekommunikation; Media and communication studies; Medie- och kommunikationsvetenskap;

   Sammanfattning : This thesis is a contribution to design-led research and addresses a readership in the fields of architecture as well as in media and communications. In juxtaposing the tools of the designer (e.g. LÄS MER

5. 4. Interaction between Electromagnetic Waves and Localized Plasma Oscillations

   Författare :Jan-Ove Hall; Thomas Leyser; Jan Trulsen; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Space and plasma physics; space physics; plasma physics; radio waves; ionospheric modification; density depleations; field-aligned irregularities; lower hybrid solitary structures; lower hybrid cavities; Z mode waves; magnetosonic waves; scattering; mode conversion; Rymd- och plasmafysik; Space physics; Rymdfysik;

   Sammanfattning : This thesis treats interaction between electromagnetic waves and localized plasma oscillations. Two specific physical systems are considered, namely artificially excited magnetic field-aligned irregularities (striations) and naturally excited lower hybrid solitary structures (LHSS). LÄS MER

7. 5. Bringing Silicon Microsystems to Space : Manufacture, Performance, and Reliability

   Författare :Johan Köhler; Gert Andersson; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Space technology; Rymdteknik; Space engineering; Rymdteknik; teknisk fysik med inriktningen mikrosystemteknik; engineering science with specialization in microsystems technology;

   Sammanfattning : The incorporation of extremely compact multifunctional microsystems is a highly profitable long-term approach in spacecraft design. These systems bring substantial launch-cost reductions, and enable exciting space exploration and science missions.Silicon microsystems technology is an adequate choice for the multifunctional microsystem development. LÄS MER