Sökning: "Per Holmgren"

Visar resultat 1 - 5 av 14 avhandlingar innehållade orden Per Holmgren.

  1. 1. Entrained flow studies on biomass fuel powder conversion and ash formation

    Författare :Per Holmgren; Markus Broström; Kentaro Umeki; Rainer Backman; Kevin Whitty; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Thermochemical biomass conversion; particle image velocimetry; gasification; entrained flow reactor; ash transformation; equilibrium calculations; slag formation;

    Sammanfattning : Reducing the global dependence on fossil fuels is of paramount importance in tackling the environmental challenges we face, not only tomorrow, but already today. Biomass offers a renewable supply of CO2-neutral raw material that can be converted into many different forms of fuels and valuable chemicals, making it a prime candidate for the technologies of tomorrow. LÄS MER

  3. 2. Postmortem toxicology : aspects on interpretation

    Författare :Per Holmgren; Jörg Mörland; Linköpings universitet; []
    Nyckelord :MEDICINE; MEDICIN;

    Sammanfattning : Postmortem toxicology is a matter of analytical chemistry and the consequent interpretation of the results. Thus, both parts are of great importance to come to the right conclusion or the most probable explanation of the analytical results. LÄS MER

  4. 3. Getting up when falling down : reducing fall risk factors after stroke through an exercise program

    Författare :Eva Holmgren; Per Wester; Britta Lindström; Gunilla Gosman-Hedström; Birgitta Lindmark; Umeå universitet; []
    Nyckelord :ADL; Balance; Depression; Exercise; Falls; Falls-efficacy; Gait; Health-related Quality of Life; Lifestyle Activities; Physiotherapy; Prevention; Rehabilitation; Stroke; Variability.; MEDICINE; MEDICIN; sjukgymnastik; Physiotherapy;

    Sammanfattning : The purpose of this thesis was to identify fall risk individuals (+55) after stroke by validating a fall risk index and in post-stroke individuals with high risk of falls evaluate the impact of an intervention program on fall risk factors.A previously developed fall risk index was validated, modified and re-validated. LÄS MER

  5. 4. Permanent stoma after anterior resection for rectal cancer : prevalence and mechanisms

    Författare :Klas Holmgren; Martin Rutegård; Jörgen Rutegård; Markku M. Haapamäki; Peter Matthiessen; Malin Sund; Per J. Nilsson; Umeå universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; rectal cancer; anterior resection; permanent stoma; defunctioning stoma; mesorectal excision; biomarkers; Surgery; kirurgi;

    Sammanfattning : While sphincter-saving surgery constitutes standard treatment for rectal cancer, anterior resection still harbours a significant risk of a permanent stoma in the long run. Although anastomotic leakage plays a major role in this surgical dilemma, the exact mechanisms are not known, while surveys indicate a stoma-free outcome is essential for a majority of patients. LÄS MER

  7. 5. Numerical Computations with Fundamental Solutions

    Författare :Per Sundqvist; Henrik Brandén; Sverker Holmgren; Alison Ramage; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; fundamental solution; partial differential equation; partial difference equation; iterative method; preconditioner; boundary method; Numerical Analysis; Numerisk analys;

    Sammanfattning : Two solution strategies for large, sparse, and structured algebraic systems of equations are considered. The first strategy is to construct efficient preconditioners for iterative solvers. The second is to reduce the sparse algebraic system to a smaller, dense system of equations, which are called the boundary summation equations. LÄS MER