Sökning: "hole injection"

Visar resultat 6 - 10 av 58 avhandlingar innehållade orden hole injection.

1. 6. Organic Hole Transport Materials for Solid-State Dye-Sensitized and Perovskite Solar Cells

   Författare :Jinbao Zhang; Erik Johansson; Gerrit Boschloo; Anders Hagfeldt; Nick Vlachopoulos; Ellen Moons; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; photoelectrochemical polymerization; PEDOT; dye; hole transport material; small molecule; perovskite solar cell;

   Sammanfattning : Solid-state dye-sensitized solar cells (ssDSSCs) and recently developed perovskite solar cells (PSCs) have attracted a great attention in the scientific field of photovoltaics due to their low cost, absence of solvent, simple fabrication and promising power conversion efficiency (PCE). In these types of solar cell, the dye molecule or the perovskite can harvest the light on the basis of electron excitation. LÄS MER

3. 7. Large-eddy simulation on the effects of fuel injection pressure on gasoline spray characteristics

   Författare :Sandip Wadekar; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; High pressure fuel-injection; GDI engine; LES; Spray characteristics;

   Sammanfattning : Increasing the injection pressure in gasoline direct injection engines has a substantial potential to reduce emissions while maintaining high efficiency in spark ignition engines. Present gasoline injectors operate at pressures of 20 to 30 MPa. LÄS MER

4. 8. THE EFFECTS OF VARIOUS NOZZLE HOLE CONFIGURATIONS ON DIESEL ENGINE PERFORMANCE

   Författare :Andreas Matsson; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Diesel engine combustion non-circular nozzle hole cavitation hydrogrinding optical study flame wall interaction;

   Sammanfattning : Any improvement that can be done with the diesel engine to reduce emissions and fuel consumption is of importance. The aim of the studies presented in this thesis was to determine whether changes in the nozzle geometry of the fuel injection systems used in diesel engines might improve their emissions and fuel consumption. LÄS MER

5. 9. Steam condensation in a water pool and its effect on thermal stratification and mixing

   Författare :Ignacio Gallego-Marcos; Pavel Kudinov; Walter Villanueva; Dominique Bestion; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Steam injection; EHS EMS; blowdown pipes; spargers; chugging; oscillatory bubble; CFD; condensation pool; stratification; mixing; Engineering Mechanics; Teknisk mekanik;

   Sammanfattning : The Pressure Suppression Pool (PSP) of a Boiling Water Reactor (BWR) is a large heat sink designed to limit the containment pressure by condensing steam released from the primary coolant system. The development of thermal stratification is a safety concern since it leads to higher containment pressures than in completely mixed conditions, and can affect the performance of systems such as the emergency core cooling and containment spray, which the use PSP as a source of water. LÄS MER

7. 10. Injector Nozzle Hole Parameters and their Influence on Real DI Diesel Performance

   Författare :Mikael Lindström; Hans- Erik Ångström; Öivind Andersson; KTH; []
   Nyckelord :Mechanical engineering; Maskinteknik;

   Sammanfattning : A modern diesel engine is capable of running efficiently with low exhaust gas emissions over a wide operating range. This is thanks to techniques such as turbocharging, EGR, charge air cooling and an advanced fuel injection process. The fuel injection process is important for the combustion and emission formation in the diesel engine. LÄS MER