Sökning: "comparisons"

Visar resultat 1 - 5 av 1280 avhandlingar innehållade ordet comparisons.

  1. 1. System studies of biogas production : comparisons and performance

    Författare :Emma Lindkvist; Magnus Karlsson; Mats Söderström; Maria Johansson; Ola Norrman Eriksson; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Biogas has the potential to be part of the transition towards a more sustainable energy system. Biogas is a renewable energy source and can play an important role in modern waste management systems. Biogas production can also help recirculate nutrients back to farmland. LÄS MER

  3. 2. Laboratory X-Ray Phase-Contrast Imaging : Methods and Comparisons

    Författare :Tunhe Zhou; Anna Burvall; Hans M. Hertz; Tim Salditt; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; X-ray imaging; Phase-contrast; Liquid-metal-jet source; Propagation-based imaging; Grating-based imaging; Speckle-based imaging; Fysik; Physics;

    Sammanfattning : X-ray phase-contrast imaging has seen rapid development in recent decades due to its superior performance in imaging low-absorption objects, compared to traditional attenuation x-ray imaging. Having higher demand on coherence, x-ray phase-contrast imaging is performed mostly at synchrotrons. LÄS MER

  4. 3. Search-Based Prediction of Software Quality : Evaluations and Comparisons

    Författare :Wasif Afzal; IS (Embedded Systems); []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Software verification and validation (V&V) activities are critical for achieving software quality; however, these activities also constitute a large part of the costs when developing software. Therefore efficient and effective software V&V activities are both a priority and a necessity considering the pressure to decrease time-to-market and the intense competition faced by many, if not all, companies today. LÄS MER

  5. 4. Proof-related reasoning in upper secondary mathematics textbooks : Characteristics, comparisons, and conceptualizations

    Författare :Andreas Bergwall; Andreas Ryve; Kimmo Eriksson; Kristina Juter; Mälardalens högskola; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; mathematics textbook; upper secondary school; proof-related reasoning; Mathematics Applied Mathematics; matematik tillämpad matematik;

    Sammanfattning : Proofs and proving are difficult to learn and difficult to teach. A common problem is that many students use specific examples as evidence for general statements. Difficulties with proofs are also part of the transition problems that exist between secondary and tertiary schooling in mathematics. LÄS MER

  7. 5. Essays on international comparisons of health care expenditure

    Författare :Ulf Gerdtham; Linköpings universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; International comparisons; Health care expenditure; Econometric analysis; cross-national; Determinants of health care expenditure; INTERDISCIPLINARY RESEARCH AREAS; TVÄRVETENSKAPLIGA FORSKNINGSOMRÅDEN;

    Sammanfattning : The five papers of this thesis continue the tradition of international comparisons of aggregate health care expenditure. The studies focus on econometric aspects, such as temporal stability of the estimated relationships, their functional form, and discrimination between different regression models. LÄS MER