Sökning: "stationary"

Visar resultat 51 - 55 av 706 avhandlingar innehållade ordet stationary.

  1. 51. Mostly Panel Econometrics : Essays on Asymptotic Analysis and Enhanced Inference

    Författare :Ovidijus Stauskas; Joakim Westerlund; Ignace De Vos; Milda Norkute; Nationalekonomiska institutionen; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Econometrics; Panel Data; Factor Models; Bootstrap; Forecasting; Non-Stationary Data; Common Correlated Effects; CCE;

    Sammanfattning : This thesis consists of five chapters which focus on panel data theory. Four of them analyze explicit panel data models and one chapter deals with time series forecasting model, where external panel data help us estimate unobserved explanatory variables. LÄS MER

  3. 52. Lithium-ion batteries for off-grid PV-systems

    Författare :Fabian Benavente; Göran Lindbergh; Anders Olof Lundblad; Saul Cabrera; Daniel Abraham; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Lithium-ion batteries; aging; partial cycles; DVA; EIS; NCA; stationary energy systems; PV systems; rural electrification.; Chemical Engineering; Kemiteknik;

    Sammanfattning : This thesis provides a comprehensive and detailed analysis on the effect ofthe battery operation strategy on the lifetime of commercial lithium-ionbatteries and on the economics of off-grid photovoltaic (PV)-batterysystems.Lithium-ion batteries play a key role in the transition to a fossil-freesociety. LÄS MER

  4. 53. Liquid Chromatography-Mass Spectrometry as a Tool for Drug Metabolite Identification in Biological Fluids : With Application to Ketobemidone

    Författare :Ingela Sundström; Per Andrén; Douglas Westerlund; Monika Johansson; Uppsala universitet; []
    Nyckelord :Analytical chemistry; LC-MS MS; accurate mass measurement; drug metabolites; microdialysate; brain; fluorinated stationary phase; phenylboronic acid; retention mechanism; Analytisk kemi;

    Sammanfattning : Electrospray ionization (ESI) mass spectrometry (MS) in combination with liquid chromatography (LC) is an excellent tool for the identification of drug metabolites. Utilizing this hyphenated technique in combination with proper sample pretreatment, the metabolic pathways of the analgesic drug ketobemidone were investigated in human urine and rat microdialysate from blood and brain. LÄS MER

  5. 54. Non-stationary rotor vibrations due to assymmetric temperature from skew heating in bearings and seals

    Författare :Björn Larsson; Patrick Keogh; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : The genesis of this thesis is physical observations of slow alterations of synchronous rotor vibrations over time. It can lead to problems such as difficulties in performing proper balancing and unacceptably high vibration levels. The cause is often asymmetric heating of the rotor shaft. LÄS MER

  7. 55. New tools for sample preparation and instrumental analysis of dioxins in environmental samples

    Författare :Lan Do; Peter Haglund; Staffan Lundstedt; Eric Reiner; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; PCDD Fs; dioxins; pressurized liquid extraction; PLE; selective SPLE; modular M-PLE; soil; sediment; sludge; gas chromatography; new stationary phases; multivariate data analysis; selectivity; interaction; Environmental Science; miljövetenskap;

    Sammanfattning : Polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs), two groups of structurally related chlorinated aromatic hydrocarbons, are of high concern due to their global distribution and extreme toxicity. Since they occur at very low levels, their analysis is complex, challenging and hence there is a need for efficient, reliable and rapid alternative analytical methods. LÄS MER