Sökning: "Preben Hansen"

Hittade 4 avhandlingar innehållade orden Preben Hansen.

  1. 1. Task-based Information Seeking and Retrieval in the Patent Domain: Processes and Relationships

    Författare :Preben Hansen; RISE; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Information-intensive work tasks in professional settings usually involve dynamic and increasingly complex information handling tasks that include the gathering, assessment, assimilation, and creation of information. Understanding the factors affecting information handling processes, and their interaction, is important and forms the objective of this thesis. LÄS MER

  3. 2. Technology-enhanced formative assessment in higher education : An intervention design of scaffolding student self-regulated learning

    Författare :Bernard Bahati; Uno Fors; Preben Hansen; Evode Mukama; Annika Lantz-Andersson; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Technology-enhanced learning; formative e-assessment; self-regulated learning; blended learning; Information Society; informationssamhället;

    Sammanfattning : As online learning is increasingly adopted in higher education institutions, many instructors are faced with the challenges of devising and implementing effective pedagogical practices that advance student learning. One of the challenges points to the design and development of assessment activities that truly inform the teaching and learning process. LÄS MER

  4. 3. On microstructure formation and mechanical properties in grey cast iron

    Författare :Attila Diószegi; Preben N. Hansén; Linköpings universitet; []
    Nyckelord :grey iron; nucleation; primary austenite; eutectic cell; growth rate; inoculation; thermal analysis; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : A major user of cast components is the automotive industry, where the functionality of the components is related to environmental demands. Internal combustion engines are constantly being improved to emit less pollution. A vital part in this development is to increase the material properties of engine components during their life cycle. LÄS MER

  5. 4. The mechanisms of metal expansion penetration during solidification of grey cast iron

    Författare :Izudin Dugic; Preben Norgaard Hansén; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Grey cast iron; solidification; solidification modelling; graphite expansion; molar volume; casting simulation; thermal analysis; thermoanalysis cup; casting temperature; inoculation; inoculant; metal expansion penetration; eutectic cell size; primary austenite; austenite grain; TECHNOLOGY; TEKNIKVETENSKAP;

    Sammanfattning : The production of high quality castings requires the casting surface to be clean and free from defects. One type of defect often found is caused by metal penetration into the sand mould. LÄS MER