Sökning: "Physics"

Visar resultat 21 - 25 av 4704 avhandlingar innehållade ordet Physics.

1. 21. Measurements of the Top Quark Pair Production Cross Section and an Estimate of the DØ Silicon Detector Lifetime

   Författare :Sara Strandberg; Christophe Clément; Barbro Åsman; Steinar Stapnes; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; particle physics; top quark pair production cross section; silicon radiation damage; DØ detector; Tevatron accelerator; Elementary particle physics; Elementarpartikelfysik; Physics; fysik;

   Sammanfattning : This thesis presents two measurements of the top quark pair production cross section at sqrt{s} = 1.96 TeV using data from the DØ experiment. Both measurements are performed in the dilepton final state and make use of secondary vertex b-tagging. LÄS MER

3. 22. Physics Students’ Experiences of the Disciplinary Discourse Encountered in Lectures in English and Swedish

   Författare :John Airey; Cedric Linder; Leif Östman; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Science Education; Naturvetenskap med utbildningsvetenskaplig inriktning; Fysik; Physics; Engelsk språkvetenskap; English; Pedagogics; Pedagogik; Educational Science; Utbildningsvetenskap; Other physics; Physics with specialization in Physics Education;

   Sammanfattning : .... LÄS MER

4. 23. Making predictions using χEFT

   Författare :Boris Karlsson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NN scattering; few-nucleon physics; nuclear physics; χEFT; uncertainty quantification;

   Sammanfattning : In this thesis we explore the merits of chiral effective field theory (χEFT) as a model for low-energy nuclear physics. χEFT is an effective field theory based on quantum chromo dynamics (QCD) describing low-energy interactions of nucleons and pions. LÄS MER

5. 24. Aspects of Hadron Production in High-Energy Heavy-Ion Physics

   Författare :David Silvermyr; Partikel- och kärnfysik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; RHIC; pad readout; electronic; chip-on-board; tracking; heavy-ion collisions; freeze-out temperature; delta resonance; SPS; WA98; PHENIX; Fysik; coherent peripheral; multiplicity; Physics; Fysicumarkivet A:2001:Silvermyr;

   Sammanfattning : High-energy heavy-ion collisions provide a unique tool for the study of nuclear matter as a function of temperature and density. WA98 at the CERN SPS recorded data with a 158 A GeV Pb beam on a Pb target in 1996. To cope with the high charged-particle density, a tracking system based on high granularity multi-step avalanche detectors was developed. LÄS MER

7. 25. Accelerators for Physics Experiments : From Diagnostics and Control to Design

   Författare :Elena Wildner; Thomas Lindblad; Mikael Eriksson; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Astroparticle physics; Astropartikelfysik;

   Sammanfattning : This thesis develops techniques of control-methods, optimization, and diagnostics of accelerator equipment and the produced particle beams with emphasis on the Large Hadron Collider (LHC) project at CERN. From a solid knowledge of the characteristics of the manufactured accelerator equipment gained from in-depth measurements and analysis of measured data, a link to an enhanced equipment design can be made. LÄS MER