Search for dissertations about: "Piston"

Showing result 1 - 5 of 133 swedish dissertations containing the word Piston.

  2. 1. α-Cell signalling in glucose-regulated glucagon secretion

    Author : Qian Yu; Anders Tengholm; Erik Gylfe; Sebastian Barg; David W Piston; Uppsala universitet; []
    Keywords : MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Islets; glucagon; insulin; somatostatin; ATP; cAMP; Ca2 ; GHB; oscillations; α-cell; β-cell; δ-cell; Medical Cell Biology; Medicinsk cellbiologi;

    Abstract : Glucagon is a blood glucose-elevating hormone released from α-cells in the islets of Langerhans during hypoglycaemia. Glucagon is critical for glucose homeostasis and inappropriate regulation of its secretion underlies both impaired counter-regulation of hypoglycaemia and chronic hyperglycaemia in diabetes patients. READ MORE

  4. 2. The role of piston bowl shape in controlling soot emissions from heavy-duty Diesel engines

    Author : Jan Eismark; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; piston bowl; radial mixing zone; soot oxidation; wave-piston; low swirl; enhanced late-cycle combustion; diesel engine;

    Abstract : .... READ MORE

  5. 3. Wear of piston rings in hydrostatic transmissions

    Author : Ulf Skytte af Sätra; Sören Andersson; Kenneth Holmberg; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; piston ring; surface roughness; texture; coating; wear; hydraulic motor; Construction engineering; Konstruktionsteknik; Mechanical engineering; Maskinteknik;

    Abstract : This study focuses on the wear of piston rings in a hydraulic radial piston motor. The piston ring has to satisfy increasing demands for reliability and longer service life. It has two contacting surfaces, the face and the flank, and operates under a boundary lubrication state. READ MORE

  6. 4. A mechanical model of an axial piston machine

    Author : Rasmus Löfstrand Grip; Ulf Sellgren; Niclas Strömberg; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Multi-body mechanical model; axial piston; Z-shaft; wobble plate; Sophia; Engineering mechanics; Teknisk mekanik;

    Abstract : A mechanical model of an axial piston-type machine with a so-called wobble plate and Z-shaft mechanism is presented. The overall aim is to design and construct an oil-free piston expander demonstrator as a first step to realizing an advanced and compact small-scale steam engine system. READ MORE

  7. 5. Modeling of a Free Piston Energy Converter

    Author : Jakob Fredriksson; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Free piston engine; detailed chemistry; variable compression; computational fluid dynamics CFD ; combustion;

    Abstract : ABSTRACTThe Free Piston Energy Converter (FPEC) is a new type of automotive prime mover, offering high efficiency in conjunction with low emissions. The FPEC essentially consists of two opposing cylinders with a linear alternator incorporated in-between that produces electric power directly. READ MORE