Search for dissertations about: "hole concentration"

Showing result 1 - 5 of 43 swedish dissertations containing the words hole concentration.

  2. 1. Structural and Electrical Transport Properties of Doped Nd-123 Superconductors

    Author : Shaban Reza Ghorbani; KTH; []
    Keywords : high temperature superconductors; critical temperature; resistivity; thermoelectric power; Hall coefficient; X-ray diffraction; Neutron diffraction; NdBa2Cu3O7-delta; hole concentration; substitution;

    Abstract : It is generally believed that one of the key parameterscontrolling the normal state and superconducting properties ofhigh temperature superconductors is the charge carrierconcentrationpin the CuO2planes.By changing the non-isovalent dopingconcentration on the RE site as well as the oxygen content in(RE)Ba2Cu3O7−δ, an excellent tool is obtained tovary the hole concentration over a wide range from theunderdoped up to the overdoped regime. READ MORE

  4. 2. A Study on Spray-Guided Stratified Charge Systems for Gasoline DI Engines

    Author : Mikael Skogsberg; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; multi-hole; DISC; direct injection; MIE; spray-guided; air-assisted; GDI; PDA; SI Engines; swirl; LIF; piezo injector;

    Abstract : Innovative technologies are required to meet ongoing challenges to reduce the CO2 emissions from passenger cars and their fuel consumption. Such technologies are usually complex and require detailed analyses to deliver efficient, reliable systems. READ MORE

  5. 3. Residual Stress Analysis and Fatigue Assessment of Welded Steel Structures

    Author : Zuheir Barsoum; Jack Samuelsson; Dan Zenkert; Stephen Maddox; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; fatigue failure; welding; weld defects; welded joints; stress concentration; residual stress; linear elastic fracture mechanics; welding simulation; finite element analysis; fatigue crack growth.; Engineering mechanics; Teknisk mekanik;

    Abstract : This doctoral thesis is concerned with fatigue life of welded structures. Several topics related to fatigue of welded structures are treated such as; weld defects and their influence on fatigue performance of welded structures, fatigue life prediction using LEFM (Linear Elastic Fracture Mechanics), fatigue testing, welding simulation, residual stress prediction and measurement and their influence on fatigue life. READ MORE

  6. 4. Atomisation and Combustion Studies of Diesel Sprays

    Author : Lionel Christopher Ganippa; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : This thesis addresses two potential problems facing investigators involved in Diesel engine development: fuel atomisation and soot formation. A particular concern has been cavitation in nozzles and its influence on the spray and combustion, investigated through impingement studies, scaled-up transparent nozzle studies and evaluation of hydro grinding effects in a real-size nozzle. READ MORE

  7. 5. Structure and physical properties of doped 123-superconductors and search for new superconducting hydrides

    Author : Pieter Lundqvist; KTH; []
    Keywords : ;

    Abstract : The field of high temperature superconductors (HTSC) isstill controversial. The difficulty to explain the high Tcvalues as well as other anomalous superconductingand normal state properties of the HTSC’s necessitatesfurther studies and search for empirical relations in the largeamount of collected data. READ MORE