Sökning: "Thomas Hammarström"
Visar resultat 1 - 5 av 9 avhandlingar innehållade orden Thomas Hammarström.
1. Detection of Partial Discharges at Fast Rising Voltages
Sammanfattning : The present demand for higher efficiency and flexibility in the energy sector has ledto an increased use of power electronic generated waveforms as these allow energyconversion between different frequencies including DC. The generated waveformsare usually synthesized by so called Pulse Width Modulation (PWM) techniques,where the desired waveform is approximated by a number of square shaped pulseswith a short rise time. LÄS MER
2. Partial Discharges at Fast Rising Voltages
Sammanfattning : The present demand for higher efficiency and flexibility in the energy sector has led to an increased use of power electronic generated waveforms as these allow energy conversion between different frequencies including DC. The generated waveforms are usually synthesized by so called Pulse Width Modulation (PWM) techniques, where the desired waveform is approximated by a number of square shaped pulses with a short rise time. LÄS MER
3. Violence in the Midst of Peace Negotiations : Cases from Guatemala, Northern Ireland, South Africa and Sri Lanka
Sammanfattning : Why do peace talks fall apart as a result of violence? The present study addresses the question of why and how violence sometimes changes the dynamics of peace negotiation processes. Incidents of violence may produce friction between and within parties. LÄS MER
4. A Novel Oil-immersed Medium Frequency Transformer for Offshore HVDC Wind Farms
Sammanfattning : In this project, a design of an oil type medium frequency transformer for offshore wind farm applications is proposed. The design is intended for applications when series coupling of the output of the DC/DC converters of the wind turbine on their secondary side is done to achieve a cost-effective high voltage solution for collecting energy from offshore wind parks. LÄS MER
5. Poly-and oligothiophenes : Optical probes for multimodal fluorescent assessment of biological processes
Sammanfattning : One interesting class of molecules in the research field of imaging biological processes is luminescent conjugated polythiophenes, LCPs. These fluorescent probes have a flexible backbone consisting of repetitive thiophene units. LÄS MER