Sökning: "pingel"

Hittade 4 avhandlingar innehållade ordet pingel.

  1. 1. Some Aspects of Propensity Score-based Estimators for Causal Inference

    Författare :Ronnie Pingel; Johan Lyhagen; Theis Lange; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; correlation; treatment effect; inverse probability weighting; local linear estimator; matching; multicollinearity; observational study.; Statistics; Statistik;

    Sammanfattning : This thesis consists of four papers that are related to commonly used propensity score-based estimators for average causal effects.The first paper starts with the observation that researchers often have access to data containing lots of covariates that are correlated. LÄS MER

  3. 2. Quantitative studies of changes in microstructure and activity during ageing of supported catalysts

    Författare :Torben Pingel; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; supported nanoparticle catalyst; scanning electron microscopy SEM ; quantitative; bimetallic catalyst; ageing properties; CO oxidation; FIB SEM; specimen preparation; particle size distribution PSD ; transmission electron microscopy TEM ;

    Sammanfattning : Catalytic converters have substantially contributed to the improvement of air quality in populated areas in the last decades by abatement of the emission of hazardous componentssuch as CO, unburned hydrocarbons and NOx. However, due to the exposure to high temperature and different components in the exhaust gas, the performance of the catalysts degrades with time. LÄS MER

  4. 3. Quantitative Electron Microscopy Studies of Metal Nanoparticle Catalysts: Nanostructure, Support Interaction and Ageing Effects

    Författare :Torben Nilsson Pingel; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; CO oxidation; strain; ageing; specimen preparation; scanning electron microscopy SEM ; FIB SEM; supported nanoparticle catalyst; transmission electron microscopy TEM ; particle size distribution PSD ; platinum;

    Sammanfattning : Heterogeneous catalysis plays a major role in modern society, for example in chemical production, sustainable energy production and emission control technologies. Metal nanoparticles (NPs) supported on oxide materials are frequent catalytic systems in this field. LÄS MER

  5. 4. Att gestalta en organisation : perspektiv på offentlig barnomsorg = [Analysing the unified whole of an organization] : [perspectives on community child care]

    Författare :Annika Lantz; Birgit Pingel; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Organisationspsykologi; Organisationsteori; Barnomsorg-- Sverige;

    Sammanfattning : .... LÄS MER