Search for dissertations about: "Energi och material"

Showing result 11 - 15 of 278 swedish dissertations containing the words Energi och material.

2. 11. Silicon photonic MEMS building blocks for low-power programmable circuits

   Author : Pierre Edinger; Kristinn Gylfason; Frank Niklaus; Sangyoon Han; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Photonics; silicon photonics; MEMS; photonic MEMS; 3D printing; liquid crystals; programmable photonics; phase shifters; optical switches; ring resonators; Electrical Engineering; Elektro- och systemteknik;

   Abstract : Silicon photonics, or the confinement and control of light in integrated silicon waveguides, has rapidly grown from research labs to high-end chips for telecommunications. With the associated improvements in waveguide performance, the technology is promising for a wide range of new applications, from computing to sensing. READ MORE

4. 12. On the influence of imperfections on microstructure and properties of recycled Al-Si casting alloys

   Author : Anton Bjurenstedt; Salem Seifeddine; Anders E.W. Jarfors; Arne Dahle; Johan Moverare; Jönköping University; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Imperfections; Recycled Al-Si alloys; Fe-rich intermetallics; Melt quality; Fractography; Defekter; Återvunna Al-Si legeringar; Fe-rika intermetaller; Smältakvalité; Fraktografi;

   Abstract : There are great energy savings to be made by recycling aluminium; as little as 5% of the energy needed for primary aluminium production may be required. Striving to produce high quality aluminium castings requires knowledge of microstructural imperfections, which is extra important when casting recycled aluminium that generally contains higher levels of imperfections compared to primary aluminium. READ MORE

5. 13. Condition measuring and lifetime modelling of electrical power transmission equipment

   Author : Per Westerlund; Patrik Hilber; Tommie Lindquist; Carl-Ejnar Sölver; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; disconnectors; circuit breakers; reliability; lifetime; electric contacts; electric power transmission; Electrical Engineering; Elektro- och systemteknik;

   Abstract : The electric grid is important in modern society, so the outages should be few. The transmission grid should have a real high availability, since it transports electrical energy across the country. Then, it is difficult to plan outages for maintenance and installation. READ MORE

6. 14. Opposition and adjustment to industrial ‘greening’ : the Swedish forest industry’s (re)actions regarding energy transition – 1989-2009

   Author : Mikael Ottosson; Jonas Anshelm; Claes-Fredrik Helgesson; Hans Andersson; Susse Georg; Linköpings universitet; []
   Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Forest industry; energy; electricity; forests; industrial greening; industrial change; actor network theory; sociology of industry; strategic management; science and technology studies; Skogsindustri; energi; elektricitet; skog; industriell miljöanpassning; industriell förändring; aktörsnätverksteori; branschsociologi; strategiforskning; teknik- och vetenskapsstudier; Technology and social change; Teknik och social förändring;

   Abstract : This thesis analyses how the Swedish forest industry has (re)acted regarding the energy transition and, in particular, regarding the reconstruction of the electricity and forest resources in Sweden during the 1989–2009 period. The thesis consists of four papers that analyse how the Swedish forest industry by means of energy management practices at individual pulp and/or paper mills, in corporate strategies performed by CEOs and boards of directors, and via its industry association, has dealt with mounting political and public demands for the industry to become ‘greener’. READ MORE

7. 15. Electron beam melting: Impact of part surface properties on metal fatigue and bone ingrowth

   Author : Rebecca Klingvall Ek; Lars-Erik Rännar; Mikael Bäckström; Jaan Hong; Ola Harrysson; Mittuniversitetet; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Additive Manufacturing AM ; Electron Beam Melting EBM ; As-built surfaces; Bone Ingrowth; Metall Fatigue; Machined Surfaces; Hirtisation; Hot Isostatic Pressing HIP ;

   Abstract : AbstractThe aim of this thesis is to investigate aspects on how additive manufacturing (AM) contributes to functional bone implants with the use of the electron beam melting (EBM) technology. AM manufactures parts according to computer-aided design, and the EBM technology melts powder using an electron beam, which acts similar to a laser beam. READ MORE