Search for dissertations about: "oil 2014"

Showing result 1 - 5 of 59 swedish dissertations containing the words oil 2014.

2. 1. Diagnostics of Oil-Impregnated Paper Insulation Systems by Utilizing Lightning and Switching Transients

   Author : Roya Nikjoo; Hans Edin; Christer Törnkvist; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Capacitance; Dielectric Response; Loss tangent; Moisture content; Oil - impregnated paper; Temperature; Transformer Bushing; Transients;

   Abstract : Development of the power gridtowards a more reliable and smarter system requires frequent on-line monitoring of the power components. Power transformers and their bushings are particularly important components in a power transmission system and their insulation degradation may lead to catastrophic failures. READ MORE

4. 2. The Effect of HV Impulses on Partial Discharge Activity and on the Dielectric Response in Oil-impregnated Paper Insulation

   Author : Respicius Clemence Kiiza; Hans Edin; Jörgen Blennow; KTH; []
   Keywords : Partial discharge; high voltage impulses; oil-impregnated paper; dielectric spectroscopy; Finite Element Method.;

   Abstract : This work investigates how HV impulses affect the behavior of partial discharge (PD) activity and the low voltage dielectric response of oil-impregnated paper insulation. It also investigates how the change in the PD activity is related to the degradation level of oil-impregnated paper insulation. READ MORE

5. 3. Valuing ecosystem services - linking ecology and policy

   Author : Maria Noring; Göran Finnveden; Cecilia Håkansson; Sara Tyskeng; Berit Hasler; KTH; []
   Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Contingent valuation; Cost-benefit analysis; Ecosystem services; Ecotoxicity; External costs; Life cycle costing; Monetary weighting; Non-market valuation; Oil spill; Planering och beslutsanalys; Planning and Decision Analysis;

   Abstract : Ecosystem services constitute a precondition for human welfare and survival. This concept has also become increasingly popular among both scientists and policymakers. Several initiatives have been taken to identify and value ecosystem services. READ MORE

6. 4. The Use of Membrane Filtration to Improve the Properties of Extracted Wood Components

   Author : Mikaela Helander; Mikael E. Lindström; Arthur J. Ragauskas; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Abstract : The forest is alarge and important natural resourcein Sweden, and approximately 70% of the country’s land area is woodland. Wood is an excellent raw material for the replacement of oil-based products because it is renewable, biodegradable and carbon neutral. READ MORE

7. 5. Good Guys : A Cultural Semiotic Study of the Print Advertising of the Oil Industry (1900-2000)

   Author : Pamela Vang; Jan Anward; Angelika Linke; Heidrun Kämper; Linköpings universitet; []
   Keywords : Oil industry; brand; print advertisements; communication; cultural semiotics; dialogism; myth; rhetoric; 20th century; Oljeindustrin; branding; tryckta annonser; kommunikation; kultursemiotik; dialogism; myt; retorik; 1900-talet;

   Abstract : Oil is central to our lives and is the source of many of the conveniences that we take for granted. It can bring wealth and prosperity to individuals and to nations, but is also a source of political conflict and the consequences of its impact on the environment are only now beginning to be fully recognised. READ MORE