Search for dissertations about: "vacuum"

Showing result 6 - 10 of 517 swedish dissertations containing the word vacuum.

  2. 6. Birth by vacuum extraction

    Author : Mia Ahlberg; Karolinska Institutet; Karolinska Institutet; []
    Keywords : ;

    Abstract : Background: In Sweden, vacuum extraction (VE) is used in almost every tenth woman to facilitate vaginal birth. VE is an important obstetric instrument that is used when shortening of the second stage of labor is necessary. VE has been associated with increased neonatal morbidity such as extracranial and cranial injuries. READ MORE

  4. 7. Adsorption isotherms of H2 and mixtures of H2, CH4, CO and CO2 on copper plated stainless steel at 4.2 K and the large hadron collider vacuum system

    Author : Erik Wallén; Chalmers tekniska högskola; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; cryotrapping; CO; accelerators; CO2; physisorption; CH4; photon stimulated desorption; vacuum; isotherms; H2;

    Abstract : .... READ MORE

  5. 8. QED and collective effects in vacuum and plasmas

    Author : Joakim Lundin; Mattias Marklund; Thomas Heinzl; Umeå universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; QED; quantum electrodynamics; quantum plasmas; quantum vacuum; Plasma physics; Plasmafysik; fysik; Physics;

    Abstract : The theory of quantum electrodynamics (QED) was born out of an attempt to merge Einsteins theory of special relativity and quantum mechanics. Einsteins energy/mass equivalence together with Heisenberg's uncertainty principle allows for particle pairs to be spontaneously created and annihilated in vacuum. READ MORE

  6. 9. Vacuum infusion of polymer composites

    Author : Magnus Andersson; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Strömningslära; Fluid Mechanics;

    Abstract : The current trend towards an increased use of vacuum infusion for manufacturing of high performance fibre reinforced polymer composites has stressed the necessity of an advanced modelling of the process. Until recent years development in this area has mainly been based on trial and error and the behaviour of the method is therefore not fully understood. READ MORE

  7. 10. Thermodynamic Aspects on Inclusion Composition and Oxygen Activity during Ladle Treatment

    Author : Johan Björklund; Pär Jönsson; Margareta Andersson; Leiv Kolbeinsen; KTH; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Ladle treatment; thermodynamics; inclusions; steel; slag; equilibrium; ladle treatment; vacuum; oxide activity; oxygen activity.; Metallurgical process and manufacturing engineering; Metallurgisk process- och produktionsteknik;

    Abstract : Two industrial studies and one set of lab scale trials have been done. In addition, a theoretical study has been done. The main focus has been on non metallic inclusion composition during the ladle refining operation in industrial steel production. Sampling has been done together with careful inclusion determination. READ MORE