Sökning: "Helium"

Visar resultat 6 - 10 av 124 avhandlingar innehållade ordet Helium.

  1. 6. Molecular Beam Studies of Interactions Between Ice Surfaces and Atmospherically Relevant Molecules

    Författare :Liza Romero Lejonthun; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; molecular beam; surface; surface scattering; collision; water ice; ice; chlorine; nitrogen oxides; nitrogen monoxide; nitrogen dioxide; dinitrogen tetroxide; dinitrogen pentoxide; nitric acid; helium; graphite;

    Sammanfattning : The discovery of the ozone hole over Antarctica in 1985 was one of the environmental issues that attracted most attention worldwide in the end of the last century. The cause of the ozone hole formation was proven to be coupled to the emission of chlorofluorocarbons (CFCs). LÄS MER

  3. 7. A study of adsorbed helium

    Författare :Anders Törne; Uppsala universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP;

    Sammanfattning : .... LÄS MER

  4. 8. Peritoneal fibrinolysis during pneumoperitoneum and laparoscopic surgery

    Författare :Maria Bergström; Göteborgs universitet; []
    Nyckelord :Laparoscopy; Fibrinolysis; Peritoneum; Mesothelial cells; Carbon Dioxide; Helium;

    Sammanfattning : BACKGROUND Laparoscopic surgery is believed to induce less postoperative adhesion formation compared with open procedures, but information regarding biological impact of a laparoscopic approach is limited. MATERIAL & METHODS Peritoneal response to laparoscopic surgery was assessed in human peritoneal tissue in two clinical trials (paper I & V). LÄS MER

  5. 9. Understanding Crustal Volatiles : Provenance,  Processes and Implications

    Författare :Lara S. Blythe; Valentin Troll; Ralf Gertisser; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; crustal volatiles; helium; carbon; volcanic gases and fluids; xeno-pumice; magma-carbonate interaction; upper crustal contamination;

    Sammanfattning : Knowledge of the provenance of crustal volatiles and the processes by which they are released is extremely important for the dynamics of magmatic systems. Presented here are the results of multiple investigations, which aim to understand magmatic volatile contamination from contrasting but complementary perspectives. LÄS MER

  7. 10. A Central Rapidity Straw Tracker and Measurements on Cryogenic Components for the Large Hadron Collider

    Författare :Hans Danielsson; Partikel- och kärnfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; physical instrumentation; tracker; transsition radiation; LHC; cryogenics; superconducting; Metrology; helium; Metrologi; fysisk instrumentering; Fysicumarkivet A:1997:Danielsson; Fysicumarkivet A:1997:Danielsson;

    Sammanfattning : This thesis is divided into two parts in which two different aspects of the Large Hadron Collider (LHC) Project are discussed. The first part describes the design of a transition radiation tracker (TRT) for the inner detector in ATLAS. In particular, the barrel part was studied in detail. The barrel TRT consists of 52 544 1. LÄS MER