Sökning: "Energy migration"

Visar resultat 21 - 25 av 149 avhandlingar innehållade orden Energy migration.

1. 21. Long-term performance of poly(vinyl chloride) cables : mechanical and electrical performances and the effect of plasticizer migration

   Författare :Maria Ekelund; Ulf W. Gedde; Minna Hakkarainen; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Poly vinyl chloride cables; ageing; mechanical properties; plasticizer migration; Polymer chemistry; Polymerkemi;

   Sammanfattning : Cables insulated with plasticized poly(vinyl chloride) were aged at temperatures between 80 and 180 °C in air and their conditions were assessed by indenter modulus measurements, tensile testing, infrared (IR) spectroscopy, differential scanning calorimetry (DSC) and liquid chromatography (HPLC). Electrical testing of oven-aged cable samples was performed in order to relate the electrical functionality during a high-energy line break accident to the mechanical properties and to establish a lifetime criterion. LÄS MER

3. 22. Movement ecology of aerial insectivorous birds : Individual-based studies on swifts and nightjars

   Författare :Gabriel Norevik; Evolutionär ekologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; swift; nightjar; Apus; Caprimulgus; tracking; archival tags; GPS; geolocation; multi-sensor logger; migration; continuous flight; route choice; altitude; lunar cycle; seasonality;

   Sammanfattning : Many birds are predisposed to annually undertake movements over large temporal and spatial scales. They have an efficient flight machinery, demonstrate impressive capacities in storing and burning fuel, and they exhibit necessary orientation and navigational skills. LÄS MER

4. 23. Coal Lives : Italians and the Metabolism of Coal in Wallonia, Belgium, 1945-1980

   Författare :Daniele Valisena; Marco Armiero; Sverker Sörlin; Don Mitchell; KTH; []
   Nyckelord :HUMANIORA; HUMANITIES; environmental humanities; migration; environmental history; coal; mining; metabolism; Italians; ECSC; heritage; toxicity; geo-history; walking methodology; minatori; emigrazione; storia delle migrazioni; storia ambientale; CECA; patrimonio culturale; tossicità; metabolismo; geostoria; mineurs italiens; migration; CECA; patrimoine; metabolisme; geo-histoire; histoire de l environnement; Historiska studier av teknik; vetenskap och miljö; History of Science; Technology and Environment;

   Sammanfattning : This manuscript focuses on the relationship between coal and the history of the over 300,000 Italian miners who moved to Wallonia, Belgium, from 1946 onwards, in accordance to the State agreement between Italy and Belgium known as “men in exchange for coal.” Notably, I use environmental history of migration to analyze what I define as “the metabolism of coal. LÄS MER

5. 24. Bird orientation: external cues and ecological factors

   Författare :Johan Bäckman; Evolutionär ekologi; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; tracking radar; Emlen funnel.; Animal ecology; Djurekologi; oscillatory orientation; roosting flight; scatter; concentration; heading; cue calibration; light dependent; magnetoreception; subcutaneous fat stores; body condition; energetics; geomagnetic field; visual cues; orientation; birds; migration;

   Sammanfattning : Birds are generally capable of accurate orientation. In this thesis I present studies about the external cues and the ecological factors that influences bird orientation. A multitude of environmental cues are used to select and maintain a proper direction. LÄS MER

7. 25. Memory Effects on Iron Oxide Filled Carbon Nanotubes

   Författare :Carlos Cava; Clas Persson; Lucimara Roman; Krister Svensson; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Memory devices; Carbon Nanotubes; energy; nanotechnology; Iron Oxide;

   Sammanfattning : In this Licentiate Thesis, the properties and effects of iron and iron oxide filled carbon nanotube (Fe-CNT) memories are investigated using experimental characterization and quantum physical theoretical models. Memory devices based on the simple assembly of Fe-CNTs between two metallic contacts are presented as a possible application involving the resistive switching phenomena of this material. LÄS MER