Sökning: "porjus"
Visar resultat 1 - 5 av 17 avhandlingar innehållade ordet porjus.
1. Porjus : en vision för industriell utveckling i övre Norrland
Sammanfattning : In the late 19th century it became possible to utilize electricity in lighting, industrial processes and for traction. To Sweden, which at that time was gradually being transformed from an overwhelmingly agrarian country into an industrialized nation, this was of great advantage because Sweden was a country well furnished with hydro-electric power, but almost completely lacking in other sources of energy. LÄS MER
2. An experimental study of the flow in a sharp-heel Kaplan draft tube
Sammanfattning : This research project was originally part of a package (Turbine-99 Draft Tube) that had a mutual goal, to improve the understanding of draft tube flow and establish Best Practise Guidelines for simulation of draft tube flow.The draft tube is situated after the runner in a Hydropower turbine to recover as much of the remaining head and kinetic energy as possible before the water leaves the turbine. LÄS MER
3. An exerimental study of the flow in a sharp-heel draft tube
Sammanfattning : The goal of the Turbine 99 Draft Tube experiments is to provide extensive experimental data on a well-defined sharp-heel draft-tube flow. The data bank has served as calibration data for the simulation challenge presented by the Turbine 99 workshop in Porjus in June 1999. LÄS MER
4. Geochemistry of the Lule River, northern Sweden, before and after regulation
Sammanfattning : The Lule River is the largest and most important river for hydropower production in Sweden. This river, situated in the northern part of the country, has been regulated since the beginning of the 20th century and is heavily regulated with 15 power stations. LÄS MER
5. Improving the functionality of synchronous machines using power electronics
Sammanfattning : With the advent of modern power electronics there is reason to explore what can be achieved when it is applied to a mature technology like synchronous machines. In this text several concepts will be presented on how it is possible to control forces and how to get better performance out of synchronous machines by using power electronics. LÄS MER