Sökning: "Breaks"

Visar resultat 1 - 5 av 326 avhandlingar innehållade ordet Breaks.

  1. 1. Dryer Section Control in Paper Machines During Web Breaks

    Författare :Jenny Ekvall; Mittuniversitetet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Dryer Section; Web breaks; Paper machine; steam pressure control; Physical modeling; Automatic control; Reglerteknik; Dryer section; paper machine; physical modeling; steam pressure control; web breaks;

    Sammanfattning : Web breaks in the dryer section of a paper machine cause loss of production and quality problems. After a web break, the steam pressure in the cylinders must be reduced to avoid overheating. LÄS MER

  3. 2. Analysis of rail breaks and insulated joint deterioration

    Författare :Johan Sandström; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Rail breaks; Heavy Haul; Insulated joints; Wheel flats; Railway mechanics; Material fatigue;

    Sammanfattning : The thesis deals with fatigue related issues in the field of railway mechanics. In particular rail breaks and deterioration of insulating joints are investigated. The study is largely motivated by plans to increase allowed axle loads in Sweden. LÄS MER

  4. 3. DNA strand breaks in single mammalian cells

    Författare :Olle Östling; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : .... LÄS MER

  5. 4. Repair of DNA double-stranded breaks in human cells

    Författare :Susanne Nyström; Göteborgs universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; DNA-PK; DNA double-stranded break; DSB; DNA single-stranded break; SSB; DNA damage; ionizing radiation; IR; DNA repair; calicheamicin gamma1; bleomycin; etoposide; topoisomerase II; radiotherapy; radiosensitizer; ATM;

    Sammanfattning : DNA is continuously subjected to degradation. Therefore, our cells need to constantly repair its DNA to prevent mutations and in the long run cancer. In mammalian cells, when DNA is broken right off, a double-stranded break (DSB) is produced, and the ends are ligated by a process called non-homologous end-joining (NHEJ). LÄS MER

  7. 5. Wheels, Rails and Insulated Joints - Damage and Failure Probability at High Speed and Axle Load

    Författare :Johan Sandström; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; rail breaks; probability; railway mechanics; contact mechanics; insulated joints; defects; fatigue;

    Sammanfattning : The thesis deals with some fatigue related problems in railway mechanics related to increased axle loads and speeds. The focus is on defects and discontinuities in the wheel--rail system that affect the risk of fatigue and fracture of railway components such as wheels, rails and insulated joints. LÄS MER