Et profilbilde

Professor
Gunnar Thorkildsen { "honorific-suffix": "Professor", "fn": "Gunnar Thorkildsen", "tel": "Telefon: 51831857", "email": "gunnar.thorkildsen@uis.no" }

Avdeling/enhet Det teknisk- naturvitenskapelige fakultet
Institutt/senter Institutt for matematikk og naturvitenskap
Rom KE E-533

Forskningsområder

Utvalgte publikasjoner

Pågående forskning

Arbeidserfaring

Vitenskapelige publikasjoner (fra CRISTin)

  • Larsen, Helge Bøvik; Thorkildsen, Gunnar; Nicholson, David Graham; Pattison, Philip (2016). Thermal induced structural properties of silver(I) sulphate (Ag2SO4). Crystal research and technology (1981). ISSN 0232-1300. Volum 51. Hefte 12. s. 730-737. DOI: 10.1002/crat.201600173.
  • Larsen, Helge Bøvik; Thorkildsen, Gunnar; Natland, Sølvi; Pattison, Philip (2014). Average crystal structure(s) of the embedded meta stable η′-phase in the Al-Mg-Zn system. Philosophical Magazine. ISSN 1478-6435. Volum 94. Hefte 15. s. 1719-1743. DOI: 10.1080/14786435.2014.895440.
  • Thorkildsen, Gunnar; Larsen, Helge Bøvik (2014). Crystallography of embedded particles in Al-Mg-Zn alloys. Symmetry analysis. Journal of Applied Crystallography. ISSN 0021-8898. Volum 47. Hefte 5. s. 1736-1748. DOI: 10.1107/S1600576714019414.
  • Larsen, Helge Bøvik; Thorkildsen, Gunnar; Nicholson, David Graham (2012). X-ray attenuation factors in fluorescence intensity emission-effects of finite sample size. Physica Scripta. ISSN 0031-8949. Volum 86. Hefte 6. DOI: 10.1088/0031-8949/86/06/065601.
  • Sjølyst-Kverneland, Atle; Hansen, Vidar; Thorkildsen, Gunnar; Larsen, Helge Bøvik; Pattison, P; Li, X.Z.; Gjønnes, Jon (2011). Transformations and structures in the Al-Zn-Mg alloy system: A diffraction study using synchrotron radiation and electron precession. Materials Science & Engineering: A. ISSN 0921-5093. Volum 528. Hefte 3. s. 880-887. DOI: 10.1016/j.msea.2010.10.001.
  • Sjølyst-Kverneland, Atle; Hansen, Vidar; Thorkildsen, Gunnar; Larsen, Helge Bøvik; Pattison, Philip; Li, XZ; Gjønnes, Jon (2010). Transformations and structures in the Al?Zn?Mg alloy system: A diffraction study using synchrotron radiation and electron precession. Materials Science & Engineering: A. ISSN 0921-5093. DOI: 10.1016/j.msea.2010.10.001.
  • Thorkildsen, Gunnar; Larsen, Helge Bøvik; Beukes, Jon Are (2006). Angle calculations for a three-circle goniostat. Journal of Applied Crystallography. ISSN 0021-8898. Volum 39.
  • Larsen, Helge Bøvik; Thorkildsen, Gunnar; Weckert, Edgar (2005). Three-beam diffraction in an elastically strained crystal plate. Acta Crystallographica Section A: Foundations of Crystallography. ISSN 0108-7673. Volum 61. s. 134-138.
  • Thorkildsen, Gunnar; Weckert, Edgar; Mo, Frode; Larsen, Helge Bøvik; Mathiesen, Ragnvald (2005). Three-beam resonant X-ray diffraction in germanium - Laue transmission cases. Acta Crystallographica Section A: Foundations of Crystallography. ISSN 0108-7673. Volum 61. s. 460-470.
  • Thorkildsen, Gunnar; Larsen, Helge Bøvik; Weckert, Edgar; Semmingsen, Dag (2003). Three-beam X-ray diffraction -- profile analysis. Journal of Applied Crystallography. ISSN 0021-8898. Volum 36. s. 1324-1333.
  • Thorkildsen, Gunnar; Larsen, Helge Bøvik (2002). Three-beam X-ray diffraction in a semi-infinite perfect crystal. ?. Volum 58. s. 252-258.
  • Thorkildsen, Gunnar; Larsen, Helge Bøvik; Semmingsen, Dag; Bjaanes, Øystein (2001). Generalized extinction in bipyramidal crystals. ?. Volum 57. s. 201-211.
  • Thorkildsen, Gunnar; Larsen, Helge Bøvik; Weckert, Edgar (2001). Approximate solution of the Takagi-Taupin equations for a semi-infinite crystal in the three-beam Laue-Laue case. ?. Volum 57. s. 389-394.
  • Thorkildsen, Gunnar; Larsen, Helge B. (2000). Comments on Extinction-Corrected mean thickness and integral width used in the program UMWEG98 by Rossmanith (2000). Journal of Applied Crystallography. ISSN 0021-8898. Volum 33.
  • Thorkildsen, Gunnar; Larsen, Helge B.; Mathiesen, Ragnvald H.; Mo, Frode (2000). Three-beam interference measurements with a six-circle kappa diffractometer. Journal of Applied Crystallography. ISSN 0021-8898. Volum 33. s. 49-51.
  • Thorkildsen, Gunnar; Larsen, Helge B.; Authier, Andre (1999). Nonsymmetrical X-ray diffraction in a perfect rectangular t x l crystal. Extinction and absorption. ?. Volum A55. Hefte 1. s. 1-13.
  • Thorkildsen, Gunnar; Larsen, Helge Bøvik (1999). X-ray diffraction in perfect t x l crystals. Rocking curves. ?. Volum A55. s. 840-854.
  • Thorkildsen, Gunnar; Larsen, Helge Bøvik (1999). X-ray intensity patterns from finite perfect crystals. ?. Volum A55. s. 1000-1013.
  • Thorkildsen, Gunnar; Mathiesen, Ragnvald H.; Larsen, Helge B. (1999). Angle calculations for a six-circle kappa diffractometer. Journal of Applied Crystallography. ISSN 0021-8898. Volum 32. s. 943-950.
  • Thorkildsen, Gunnar; Larsen, Helge B.; Authier, Andre (1998). Three-Beam Diffraction in Finite Perfect Crystals. I: Exploring Laue-Laue and Bragg-Laue Scattering Using a Series-Expansion Approach for the Solution of the Takagi-Taupin Equations. ?. Volum A54. Hefte 1. s. 120-128.
  • Larsen, Helge B.; Thorkildsen, Gunnar; Authier, Andre (1998). An exact analytical expression for the primary extinction factor for a perfect spherical crystal in the limit oh->/2. ?. Volum A54. s. 511-512.
  • Larsen, Helge B.; Thorkildsen, Gunnar; Authier, Andre (1998). Three-Beam Diffraction in Finite Imperfect Crystals. An Analysis of Coherent Wavefield Interactions Using Statistical Dynamical Theory. ?. Volum A54. Hefte 1. s. 137-145.
  • Larsen, Helge B.; Thorkildsen, Gunnar; Authier, Andre (1998). Three-Beam Diffraction in Finite Perfect Crystals. II. Influence of Absorption, Resonant Scattering and Polarization. ?. Volum A54. Hefte 1. s. 129-136.
  • Thorkildsen, Gunnar; Larsen, Helge B.; Authier, Andre (1998). Absorption and Weighted Path Lengths in Cylinders and Spheres. ?. Volum A54. s. 186-190.
  • Thorkildsen, Gunnar; Larsen, Helge B.; Authier, Andre (1998). Primary Extinction in Cylinders and Spheres. ?. Volum A54. s. 172-185.
  • Thorkildsen, Gunnar; Larsen, Helge B.; Authier, Andre (1998). Symmetrical X-ray Diffraction in a Perfect Rectangular t x l Crystal. Extinction and Absorption. ?. Volum A54. s. 416-429.
  • Svare, Ivar; Thorkildsen, Gunnar; Andersson, H.I.; Skjæveland, Svein Magne; Trivijitkasem, P. (1978). Proton Relaxation by Tunneling in Ammonium Salts at Low Temperature. Journal of Physics C: Solid State Physics. ISSN 0022-3719.
  • Thorkildsen, Gunnar; Larsen, Helge Bøvik (2007). Crystallography of embedded particles in FCC metal matrices. Universitetet i Stavanger. ISBN 9788276443325. 303 s.
  • Thorkildsen, Gunnar; Larsen, Helge Bøvik; Beukes, Jon Are (2005). Angle Calculations for a Six Circle Kappa-Diffractometer IV Orientation Matrix. University of Stavanger. ISBN 8276442544. 139 s.
  • Thorkildsen, Gunnar; Larsen, Helge Bøvik; Beukes, Jon Are (2004). Angle Calculations for a six circle kappa-diffractometer. III. psi-rotations and scan procedures. ISBN 8276442153. 143 s.
  • Thorkildsen, Gunnar; Larsen, Helge Bøvik (2002). Angle Calculations for a Six Circle Kappa-Diffractometer II. General Orientation of Axes. Høgskolen i Stavanger. ISBN 8276441858. 79 s.
  • Thorkildsen, Gunnar; Larsen, Helge B. (1999). Two Beam Diffraction in Perfect Crystals analyzed by Takagi's Equations. Part 4. Rocking Curves. Mathematica Function Definitions and Notebooks. Høgskolen i Stavanger. ISBN 82-7644-074-6. 170 s.
  • Thorkildsen, Gunnar; Larsen, Helge B. (1998). Three-beam Diffraction in Imperfect Crystals. Høgskolen i Stavanger. ISBN 82-7644-052-5. 48 s.
  • Thorkildsen, Gunnar; Larsen, Helge B. (1998). Two Beam Diffraction in Perfect Crystals Analyzed by Takagi's Equations. Part 3. Rocking Curves and Intensity Distributions. Høgskolen i Stavanger. ISBN 82-7644-056-8. 135 s.
  • Thorkildsen, Gunnar; Larsen, Helge B.; Mathiesen, Ragnvald H.; Mo, Frode (1998). Test Experiments with the KUMA6 Diffractometer at the SNBL, EH-2. Project 01-02-115. 23 s.
  • Thorkildsen, Gunnar; Mathiesen, Ragnvald H.; Larsen, Helge B. (1998). Angle Calculations for a Six-Circle kappa-Diffractometer. Avd. for tekn.-naturvitenskapelige fag, Høgskolen i Stavanger. ISBN 82-7644-065-7. 86 s.
  • Thorkildsen, Gunnar; Larsen, Helge Bøvik (1997). Two Beam Diffraction in Perfect Crystals Analyzed by Takagi's Equations. Part 1-Basic Principles and Methods of Solutions. Working Papers from Stavanger College. ISBN 82-7644-040-1.
  • Thorkildsen, Gunnar; Larsen, Helge Bøvik (1997). Two Beam Diffraction in Perfect Crystals Analyzed by Takagi's Equations. Part 2-Function Definitions, Notebooks and Worksheets. Working Papers from Stavanger College. ISBN 82-7644-042-8.
  • Thorkildsen, Gunnar; Larsen, Helge Bøvik (2015). The atomic anisotropic displacement tensor - completing the picture.
  • Hansen, Vidar; Oddsen, Ingunn Cecilie; Kverneland, Atle; Larsen, Helge Bøvik; Pattison, Philip; Thorkildsen, Gunnar; Gjønnes, Jon (2009). Diffuse scattering from zones and particles in the Al-Zn-Mg alloy system. 2009-06-25 - 2009-06-26.
  • Hansen, Vidar; Kverneland, Atle; Li, X.Z.; Thorkildsen, Gunnar; Larsen, Helge Bøvik; Gjønnes, Jon (2008). Elektronmikroskopi og synkrotronrøntgen diffraksjonsstudier av transformasjoner og strukturer i 7xxx-legeringer. 2008-05-21 - 2008-05-22.
  • Natland, Sølvi; Larsen, Helge Bøvik; Thorkildsen, Gunnar; Pattison, Philip (2008). Diffraction studies of an Al-Mg-Zn single crystal by synchrotron radiation. 2008-08-23 - 2008-08-31.
  • Hansen, Vidar; Kverneland, Atle; Thorkildsen, Gunnar; Larsen, Helge Bøvik; Vincent, Roger; Gjønnes, Jon (2007). Structure analysis of the n'-precipitate in Al-Zn-Mg alloys by the precession technique in electron diffraction and synchrotron radiation. 2007-01-08 - 2007-01-11.
  • Hansen, Vidar; Kverneland, Atle; Thorkildsen, Gunnar; Larsen, Helge Bøvik; Pattison, Philip; Gilmore, Cristopher; Vincent, Roger; Gjønnes, Jon (2006). Structure determination of nanosized semi-coherent Al-Mg-Zn precipitates by precession electron diffraction and synchrotron X-ray diffraction. 2006-08-06 - 2006-08-11.
  • Larsen, Helge Bøvik; Thorkildsen, Gunnar (2004). Kappa six circle diffractometer -- benchmarking. Swiss Norwegian Beam Lines at the European Synchrotron Radiation Facility; 2004-05-10.
  • Larsen, Helge Bøvik; Thorkildsen, Gunnar (2004). Multiple beam diffraction -- the basics, applications and possible developments. Ecole Polytechnique Federale de Lausanne; 2004-12-06.
  • Larsen, Helge Bøvik; Thorkildsen, Gunnar (2004). Three-beam diffraction in imperfect crystals. Hamburger Synkrotronenstrahl Labor at Deutsches Elektronen-Synkrotron; 2004-06-23.
  • Thorkildsen, Gunnar (2004). Fysikklaboratorium -- Forelesningsnotater.
  • Larsen, Helge Bøvik; Thorkildsen, Gunnar (2003). Three-beam X-ray diffraction -- profile analysis. 2003-08-24 - 2003-08-29.
  • Thorkildsen, Gunnar; Larsen, Helge Bøvik (2002). TE-6254 Materialfysikk.
  • Larsen, Helge Bøvik; Thorkildsen, Gunnar (2001). Three-beam Diffraction -- Only for Phase-Estimation??. 2001-02-19 - 2001-02-20.
  • Larsen, Helge Bøvik; Thorkildsen, Gunnar (2001). Three-beam Diffraction -- Only for Phase-Estimation ???. 2001-01-18 - 2001-01-19.
  • Thorkildsen, Gunnar (2001). Spredning av røntgenstråler i krystaller. Instititutt for Matematatikk og Naturvitenskap v/Knutsen, H. og Almaa; 2001-03-08.
  • Thorkildsen, Gunnar; Larsen, Helge Bøvik (2001). Dynamical scattering of X-rays in finite crystals. 2001-01-18 - 2001-01-19.
  • Larsen, Helge B.; Thorkildsen, Gunnar (2000). Measurements of dynamical diffraction effects in finite crystals.
  • Larsen, Helge Bøvik; Thorkildsen, Gunnar (1999). Interference Patterns from semi-infinite and finite Crystals.
  • Thorkildsen, Gunnar (1999). X-ray diffraction in finite perfect crystals.
  • Thorkildsen, Gunnar; Larsen, Helge B. (1998). Polarization Effects in Three-Beam Diffraction from Small, Finite Crystals.
  • Thorkildsen, Gunnar; Larsen, Helge B. (1998). Calculating the Integrated Power as a Function of Wavelenght for a Finite Perfect Crystal using MATHEMATICA.