Search for dissertations about: "long term stability"

Showing result 6 - 10 of 351 swedish dissertations containing the words long term stability.

2. 6. Grid reinforcing wind generation

   Author : Nayeem Ullah; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; transient stability; variable speed wind turbine; long term voltage stability; short term voltage stability; frequency converter;

   Abstract : In this thesis, effects of some grid assisting possibilities that wind turbines could be equipped with, are investigated. The background is that concerns regarding the stability of the already existing power system in the presence of large wind farms have been risen. READ MORE

4. 7. On Stability and Surge in Turbocharger Compressors

   Author : Bertrand Kerres; Andreas Cronhjort; Mihai Mihaescu; Jörg Seume; KTH; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Turbocharger; Radial Compressor; Stability; Surge; Hurst exponent; Fractals; Machine Design; Maskinkonstruktion;

   Abstract : Turbochargers are used on many automotive internal combustion engines to increase power density. The broad operating range of the engine also requires a wide range of the turbocharger compressor. At low mass flows, however, turbo compressor operation becomes unstable and eventually enters surge. READ MORE

5. 8. Long-term perspectives on musculoskeletal pain : Health care utilization and integration of behavioral medicine treatment into physical therapy

   Author : Christina Emilson; Pernilla Åsenlöf; Ingrid Demmelmaier; Stefan Bergman; Ida Flink; Uppsala universitet; []
   Keywords : Chronic pain; health care utilization; behavioral medicine; stratified treatment; prognostic factors; physical therapy; primary care; Medicinsk vetenskap; Medical Science;

   Abstract : There are currently no effective methods for treating and preventing chronic pain. The aim of this thesis was to study prognostic factors for health care utilization, and the long-term outcomes of tailored behavioral medicine treatment for patients with musculoskeletal pain. READ MORE

6. 9. Long-term properties of polyethylene films : efficiency of a natural antioxidant

   Author : Clara Strandberg; Ann-Christine Albertsson; Jukka Seppälä; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Polymer Technology; alfa-tocopherol; Polyethylene PE ; Thermal aging; Infrared Spectroscopy FT-IR ; Chemiluminescence CL ; Solid-phase microextraction SPME ; Chemistry; Kemi;

   Abstract : There is a growing awareness of the risks of pollution in biological systems and one potential problem is the synthetic antioxidants, used for e.g. the stabilisation of polymeric materials. Natural antioxidants are an interesting alternative, if the high efficiency and thermal stability of the synthetic compounds can be reached. READ MORE

7. 10. Changing Landscapes and Persistent Places : An Exploration of the Bjäre Peninsula

   Author : Jenny Nord; Arkeologi; []
   Keywords : HUMANIORA; HUMANITIES; European landscape convention; Bronze Age landscape; landscape archaeology; historic landscape characterisation; place and space; landscape memories; rock-carvings; cupmarks; mortuary monuments; burial mounds; burial cairns; stonesettings; communication; chronology; management issues; cultural biography; intangible values; long term stability; long term change;

   Abstract : Changing Landscapes and Persistent Places is a study of the cultural landscape on the Bjäre peninsula in northwest Skåne. The many Bronze Age remains that give the landscape its distinctive character are the starting point for an attempt to increase our understanding of the historical depth of today’s landscape. READ MORE