Sökning: "sten persson"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden sten persson.

  1. 1. Constitutive and fatigue crack propagation behaviour of Inconel 718

    Författare :David Gustafsson; Kjell Simonsson; Johan Moverare; Sjöström Sören; Sten Johansson; Christer Persson; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nickel-base superalloys constitutive modelling mean stress relaxation fatigue crack propagation hold times grain boundary embrittlement;

    Sammanfattning : In this licentiate thesis the work done in the TURBO POWER project Influence of high temperature hold times on the fatigue life of nickel-based superalloys will be presented. The overall objective of this project is to develop and evaluate tools for designing against fatigue in gas turbine applications, with special focus on the nickel-based superalloy Inconel 718. LÄS MER

  3. 2. Sakrättsliga moment och deras ekonomiska konsekvenser

    Författare :Per Henriksson; Annina H. Persson; Sten Nyberg; Berte-Elen R. Konow; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; rights in rem; perfection requirements; economic efficiency; pledge; assignment; mortgage; Property and real estate law; Sakrätt; Private Law; civilrätt;

    Sammanfattning : This thesis is a study on the Swedish system concerning perfection of rights in rem, i.e. the requirements which must be fulfilled if a purchaser or pledgee is to become protected against third party’s rights on the seller’s or pledgor’s side. In the first part of the study the perfection requirements are analysed from a legal perspective. LÄS MER

  4. 3. Quantum Chemical Modeling of Dye-Sensitized Titanium Dioxide : Ruthenium Polypyridyl and Perylene Dyes, TiO2 Nanoparticles, and Their Interfaces

    Författare :Maria J. Lundqvist; Sten Lunell; Petter Persson; Lars Ojamäe; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Quantum chemistry; density functional theory; chromophore; nanocrystal; interface; photoexcitation; triplet state; surface electron transfer; electronic coupling strength; Kvantkemi; Quantum chemistry; Kvantkemi;

    Sammanfattning : Quantum chemical calculations have been used to model dye-sensitized nanostructured titanium dioxide systems that can be used in solar cells for solar energy to electricity conversion. Structural, electronic and spectral properties of isolated dyes and both bare and dye-sensitized TiO2 have been calculated with density functional theory, providing detailed information about both the separate parts and the dye-TiO2 interface. LÄS MER

  5. 4. Computational Investigation of Dye-Sensitized Solar Cells

    Författare :Mattias Nilsing; Sten Lunell; Lars Ojamäe; Petter Persson; Sven Stafström; Uppsala universitet; []
    Nyckelord :Quantum chemistry; titanium dioxide; anatase; rutile; pyridine; perylene; nanostructured; interface; electronic coupling; electron injection; quantum chemistry; phosphonic acid; Kvantkemi;

    Sammanfattning : Interfaces between semiconductors and adsorbed molecules form a central area of research in surface science, occurring in many different contexts. One such application is the so-called Dye-Sensitized Solar Cell (DSSC) where the nanostructured dye-semiconductor interface is of special interest, as this is where the most important ultrafast electron transfer process takes place. LÄS MER

  7. 5. Discrete-Event Simulation for Hospital Resource Planning : Possibilities and Requirements

    Författare :Krisjanis Steins; Jan Lundgren; Fredrik Persson; Sten Walther; Lisa Brouwers; Linköpings universitet; []
    Nyckelord :Discrete-event simulation DES ; health care; resource planning; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : The delivery of health care services has been under pressure due to limited funding and increasing demand. This has highlighted the need to increase not only the effectiveness but also the efficiency of health care delivery. LÄS MER