Sökning: "axis"

Visar resultat 16 - 20 av 853 avhandlingar innehållade ordet axis.

1. 16. Analytical Aerodynamic Simulation Tools for Vertical Axis Wind Turbines

   Författare :Paul Deglaire; Hans Bernhoff; Olov Ågren; Staffan Lundstrom; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; vertical axis turbine; vortex flows; conformal mapping; analytical aerodynamics; potential flows; fast multipole methods; Fluid mechanics; Strömningsmekanik; Teknisk fysik; Engineering Science;

   Sammanfattning : Wind power is a renewable energy source that is today the fastest growing solution to reduce CO2 emissions in the electric energy mix. Upwind horizontal axis wind turbine with three blades has been the preferred technical choice for more than two decades. This horizontal axis concept is today widely leading the market. LÄS MER

3. 17. Gut microbiota, its modifications and the gut-brain axis

   Författare :Julia Rode; Robert Jan Brummer; Julia König; Mirjana Rajilic-Stojanovic; Örebro universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; gut microbiota; gut-brain axis; faecal microbiota transfer; probiotics; butyratFunctional magnetic resonance imaging; mental health; collagenous colitis;

   Sammanfattning : The human intestinal microbiota has a major impact on host physiology and might play an important role in several diseases. Therapeutic interventions aimed at modifying the gut microbiota might exert their effects locally as well as systemically, for example via the gut-brain axis, a bidirectional communication system. LÄS MER

4. 18. Direct Driven Generators for Vertical Axis Wind Turbines

   Författare :Sandra Eriksson; Hans Bernhoff; Mats Leijon; Jörgen Blennow; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; synchronous generator; wind power; vertical axis wind turbine; simulations; experiments; finite element method; Engineering physics; Teknisk fysik;

   Sammanfattning : Wind power is a renewable energy source that is increasingly used all over the world. Most wind turbines have a horizontal axis of rotation but a few have a vertical axis of rotation. The concept presented in this thesis is a straight-bladed vertical axis wind turbine with a direct driven cable-wound permanent magnet synchronous generator. LÄS MER

5. 19. Experimental Vertical Axis Wind Turbine System

   Författare :Jon Kjellin; Uppsala universitet; []
   Nyckelord :TECHNOLOGY; TEKNIKVETENSKAP;

   Sammanfattning : Vertical axis wind turbines may have mechanical advantages compared to conventional horizontal axis wind turbines, which make vertical turbines interesting to study. A 12 kW straight-bladed Darrieus turbine has been designed and constructed by the Division of Electricity at Uppsala University. LÄS MER

7. 20. Electromechanics of Vertical Axis Wind Turbines

   Författare :Morgan Rossander; Sandra Eriksson; Hans Bernhoff; Daniel Karlsson; Uppsala universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wind power; Diode rectification; Control; Measurement; Simulation; Electromechanical coupling; vindkraft; diodlikriktning; reglering; mätning; simulering; Engineering Science with specialization in Science of Electricity; Teknisk fysik med inriktning mot elektricitetslära;

   Sammanfattning : Wind power is an established mean of clean energy production and the modern horizontal axis wind turbine has become a common sight. The need for maintenance is high and future wind turbines may need to be improved to enable more remote and offshore locations. LÄS MER