Publications

Journal papers

Bo Jakobsen, Tina Hecksher, Tage Christensen, Niels Boye Olsen, Jeppe C. Dyre, and Kristine Niss. Identical temperature dependence of the time scales of several linear-response functions of two glass-forming liquids. Journal of Chemical Physics - Communication, 136:081102, 2012. [ DOI ]

U. Lienert, S.F. Li, C.M. Hefferan, J. Lind, R.M. Suter, J.V. Bernier, N.R. Barton, M.C. Brandes, M.J. Mills, M.P. Miller, B. Jakobsen, and W. Pantleon. High-energy diffraction microscopy at the advanced photon source. JOM, 63:70-77, 2011.

Ditte Gundermann, Ulf R. Pedersen, Tina Hecksher, Nicholas P. Bailey, Bo Jakobsen, Tage Christensen, Niels B. Olsen, Thomas B. Schrøder, Daniel Fragiadakis, Riccardo Casalini, C. Michael Roland, Jeppe C. Dyre, and Kristine Niss. Predicting the density scaling exponent from prigogine-defay ratio measurements. Nature Physics, 7:816-821, 2011. [ DOI ]

Tage Christensen, Bo Jakobsen, Jon Papini, Tina Hecksher, Jeppe C. Dyre, and Niels Boye Olsen. A combined measurement of thermal and mechanical relaxation. Journal of Non-Crystalline Solids, 357:346-350, 2011. “6th IDMRCS” special issue. [ DOI ]

Bo Jakobsen, Kristine Niss, Claudio Maggi, Niels Boye Olsen, Tage Christensen, and Jeppe C. Dyre. Beta relaxation in the shear mechanics of viscous liquids: Phenomenology and network modeling of the alpha-beta merging region. Journal of Non-Crystalline Solids, 357:267-273, 2011. “6th IDMRCS” special issue. [ DOI ]

Bo Jakobsen, Niels Boye Olsen, and Tage Christensen. Frequency-dependent specific heat from thermal effusion in spherical geometry. Physical Review E, 81:061505, 2010. [ DOI ]

Claudio Maggi, Bo Jakobsen, and Jeppe C. Dyre. Unique dynamic correlation length in supercooled liquids. arXiv:1003.0341v1 [cond-mat.soft], 2010. Submitted to The Journal of Physical Chemistry B. [ http ]

W. Pantleon, C. Wejdemann, B. Jakobsen, U. Lienert, and H.F. Poulsen. Evolution of deformation structures under varying loading conditions followed in situ by high angular resolution 3dxrd. Materials Science and Engineering A, 524:55-63, 2009. [ DOI ]

Ulf R. Pedersen, Tina Hecksher, Bo Jakobsen, Thomas B. Schrøder, Nicoletta Gnan, Nicholas P. Bailey, and Jeppe C. Dyre. Estimating the density scaling exponent of viscous liquids from specific heat and bulk modulus data. arXiv:0904.3537v1 [cond-mat.soft], 2009. [ http ]

Albena I. Nielsen, Tage Christensen, Bo Jakobsen, Kristine Niss, Niels Boye Olsen, Ranko Richert, and Jeppe C. Dyre. Prevalence of approximate sqrt(t) relaxation for the dielectric α process in viscous organic liquids. Journal of Chemical Physics, 130:154508, 2009. [ DOI ]

Claudio Maggi, Bo Jakobsen, Tage Christensen, Niels Boye Olsen, and Jeppe C. Dyre. Supercooled liquid dynamics studied via shear-mechanical spectroscopy. The Journal of Physical Chemistry B, 112:16320-16325, 2008. [ DOI | http ]

Bo Jakobsen, Claudio Maggi, Tage Christensen, and Jeppe C. Dyre. Investigation of the shear-mechanical and dielectric relaxation processes in two monoalcohols close to the glass transition. Journal of Chemical Physics, 129:184502, 2008. [ DOI | http ]

Bo Jakobsen, Henning Friis Poulsen, Ulrich Lienert, Joel Bernier, Carsten Gundlach, and Wolfgang Pantleon. Stability of dislocation structures in copper towards stress relaxation investigated by high angular resolution 3d x-ray diffraction. Physica Status Solidi (a), 206:21-30, 2009. [ DOI ]

Nicholas P. Bailey, Tage Christensen, Bo Jakobsen, Kristine Niss, Niels Boye Olsen, Ulf R. Pedersen, Thomas B. Schrøder, and Jeppe C Dyre. Glass-forming liquids: one or more 'order' parameters? Journal of Physics: Condensed Matter, 20:244113, 2008. [ DOI ]

B. Jakobsen, U. Lienert, J. Almer, H.F. Poulsen, and W. Pantleon. Direct observation of strain in bulk subgrains and dislocation walls by high angular resolution three-dimensional X-ray diffraction. Materials Science and Engineering: A, 483-484:641-643, 2008. Proceedings of ICSMA14. [ DOI ]

M. Brøns, B. Jakobsen, K. Niss, A. Bisgaard, and L. K. Voigt. Streamline topology in the near wake of a circular cylinder at moderate Reynolds numbers. Journal of Fluid Mechanics, 584:23-43, 2007. [ DOI ]

Bo Jakobsen, Henning F. Poulsen, Ulrich Lienert, and Wolfgang Pantleon. Direct determination of elastic strains and dislocation densities in individual subgrains in deformation structures. Acta Materialia, 55:3421-3430, 2007. [ DOI ]

B. Jakobsen, H. F. Poulsen, U. Lienert, X. Huang, and W. Pantleon. Investigation of the deformation structure in an aluminium magnesium alloy by high angular resolution three-dimensional X-ray diffraction. Scripta Materialia, 56:769-772, 2007. [ DOI ]

Bo Jakobsen, Henning F. Poulsen, Ulrich Lienert, John Almer, Sarvjit D. Shastri, Henning O. Sørensen, Carsten Gundlach, and Wolfgang Pantleon. Formation and subdivision of deformation structures. Science, 312:889-892, 2006. [ DOI | http ]

H.O. Sørensen, B. Jakobsen, E. Knudsen, E.M. Lauridsen, S.F. Nielsen, H.F. Poulsen, S. Schmidt, G. Winther, and L. Margulies. Mapping grains and their dynamics in three dimensions. Nuclear Instruments and Methods in Physics Research Section B, 246:232-237, 2006. [ DOI ]

Kristine Niss, Bo Jakobsen, and Niels Boye Olsen. Dielectric and shear mechanical relaxations in glass-forming liquids: A test of the Gemant-DiMarzio-Bishop model. Journal of Chemical Physics, 123:234510, 2005. [ DOI | http ]

Bo Jakobsen, Kristine Niss, and Niels Boye Olsen. Dielectric and shear mechanical alpha and beta relaxations in seven glass-forming liquids. Journal of Chemical Physics, 123:234511, 2005. [ DOI | http ]

Proceedings

W. Pantleon, C. Wejdemann, B. Jakobsen, U. Lienert, and H.F. Poulsen. Advances in characterization of deformation structures by high resolution reciprocal space mapping. In N. Hansen, D. Juul Jensen, S.F. Nielsen, H.F. Poulsen, and B. Ralph, editors, Proceedings of the 31st Risø International Symposium on Materials Science: Challenges in materials science and possibilities in 3D and 4D characterization techniques, pages 79-100. Risø National Laboratory for Sustainable Energy, Technical University of Denmark, 2010.

B. Jakobsen, U. Lienert, J. Almer, W. Pantleon, and H.F. Poulsen. Properties and dynamics of bulk subgrains probed in-situ using a novel x-ray diffraction method. Materials Science Forum, 550:613-618, 2007. Proceedings of ”Fundamentals of Deformation and Annealing Symposium´´, Manchester, 2006. [ http ]

U. Lienert, J. Almer, B. Jakobsen, W. Pantleon, H.F. Poulsen, D. Hennessy, C. Xiao, and R.M. Suter. 3-dimensional characterization of polycrystalline bulk materials using high-energy synchrotron radiation. Materials Science Forum, 539-543:2353-2358, 2007. Proceedings of ”International Conference on Processing & Manufacturing Of Advanced Materials (THERMEC) 2006´´.

Wolfgang Pantleon, Bo Jakobsen, Ulrich Lienert, Jon Almer, Carsten Gundlach, and Henning Friis Poulsen. In-situ observation of individual subgrains by 3dxrd during deformation and recovery. In Akhtar S. Khan and Rehan Kazmiy, editors, Anisotropy, Texture, Dislocations and Multiscale Modeling in Finite Plasticity & Viscoplasticity, and Metal Forming - Proceedings of PLASTICITY '06: The Twelfth International Symposium on Plasticity and its Current Applications, pages 664-666. NEAT PRESS, 2006.

U. Lienert, J. Almer, B. Jakobsen, H.F. Poulsen, and W. Pantleon. Observation of dislocation structure evolution by analysis of x-ray peak profiles from individual bulk grains. In Proceedings of the 25th Risø International Symposium on Materials Science: Evolution of Deformation Microstructures in 3D, pages 417-422, 2004.

Reports

Bo Jakobsen. In-situ studies of bulk deformation structures: Static properties under load and Dynamics during deformation. Ph.d. thesis, Roskilde University, 2006. arXiv:0708.3986v1 [cond-mat.mtrl-sci]. [ http ]

Kristine Niss and Bo Jakobsen. Dielectric and shear mechanical relaxation in glass forming liquids - a thorough analysis and experimental test of the dimarzio-bishop model. Master thesis, Roskilde University, 2003. Text nr. 424 in "Tekster fra IMFUFA". [ http ]

Kristine Niss and Bo Jakobsen. Hopf bifurcation and topology in fluid flow (in danish). Project thesis, Roskilde University, 2002. Text nr. 412 in "Tekster fra IMFUFA". [ .ps ]

Presentations

Bo Jakobsen. Emacs med auctex & reftex som latex editor. Presentation, 2011. Emacsforum 2011, DIKU (November 12, Copenhagen, Denmark).

Bo Jakobsen. Eksperimenter på bløde og hårde materialer. Presentation, 2011. IMFUFA Årsmøde, RUC (November 5, Roskilde, Denmark).

Bo Jakobsen, Tina Hecksher, Kristine Niss, Tage Christensen, N. Boye Olsen, and Jeppe Dyre. Temperature-independent decoupling between the characteristic time scales of five independent linear response functions. Poster, 2011. International Workshop on Dynamics in Viscous Liquids III (March 30 - April 2, Rome, Italy).

Bo Jakobsen, Tina Hecksher, Kristine Niss, Ditte Gundermann, Tage Christensen, N. Boye Olsen, and Jeppe Dyre. Comparison of the characteristic timescale from 5 independent response functions. Talk, 2011. 3rd Chalmers-Roskilde Workshop on Liquids and Glasses (January 17 - 18, Chalmers, Göteborg, Sweden).

Bo Jakobsen, Tina Hecksher, Kristine Niss, Ditte Gundermann, Tage Christensen, N. Boye Olsen, and Jeppe Dyre. Investigation of the uniqueness of the temperature dependence of the characteristic timescale in glass-forming liquids. Oral presentation, and abstract in collection, 2010. Annual meeting of Danish Physical Society (June 22-23, Nyborg, Denmark).

Bo Jakobsen, Tina Hecksher, Kristine Niss, Ditte Gundermann, Tage Christensen, N. Boye Olsen, and Jeppe Dyre. Comparing the timescale from ac-calorimetric measurements to the timescales from four other response functions. Poster, 2010. 11th Lähnwitzseminar on Calorimetry (June 6-11, Rostock, Germany).

Bo Jakobsen, Tina Hecksher, Kristine Niss, Ditte Gundermann, Tage Christensen, N. Boye Olsen, and Jeppe Dyre. Comparison of the characteristic timescale from 5 independent response functions. Oral presentation, 2010. International workshop on Viscous Liquids and the Glass Transition (VIII) (May 28-30, Søminestationen, Denmark).

Bo Jakobsen, Tina Hecksher, Kristine Niss, Ditte Gundermann, Tage Christensen, N. Boye Olsen, and Jeppe Dyre. Comparison of the characteristic timescale from 5 independent response functions. Oral presentation, and abstract in collection, 2010. XII International Workshop on Complex Systems (March 15-18, Andalo, Trento, Italy).

B. Jakobsen, K. Niss, C. Maggi, N. B. Olsen, T. Christensen, and J. C. Dyre. Secondary relaxation observed by broadband shear-mechanical spectroscopy. Invited Oral presentation, and abstract in collection, 2009. 6th International Discussion Meeting on Relaxations in Complex Systems (IDMRCS6) (August 30 - September 5, Rome, Italy).

Bo Jakobsen, Niels Boye Olsen, and Tage Christensen. Frequency-dependent specific heat from thermal effusion in spherical geometry. Oral presentation, 2009. 1st Chalmers-Roskilde Workshop on Liquids and Glasses (January 15-16, Chalmers, Göteborg, Sweden).

Bo Jakobsen, Niels Boye Olsen, and Tage Christensen. Frequency-dependent specific heat from thermal effusion in spherical geometry. Oral presentation, and abstract in collection, 2008. Fragility of Viscous Liquids: Cause(s) and Consequences (October 8-10, Copenhagen, Denmark).

Bo Jakobsen, Claudio Maggi, Tage Christensen, and Jeppe C. Dyre. Broadband shear mechanical and dielectric investigation of monohydroxy alcohols close to the glass transition temperature. Poster presentation, and abstract in collection, 2008. Fragility of Viscous Liquids: Cause(s) and Consequences (October 8-10, Copenhagen, Denmark).

Bo Jakobsen, Claudio Maggi, Tage Christensen, and Jeppe C. Dyre. Broadband shear mechanical and dielectric investigation of monohydroxy alcohols close to the glass transition temperature. Poster presentation, 2008. Annual meeting of the Danish Physical Society (June 17-18, Nyborg, Denmark).

Bo Jakobsen, Claudio Maggi, Tage Christensen, and Jeppe C. Dyre. Broadband shear mechanical and dielectric investigation of monohydroxy alcohols close to the glass transition temperature. Poster presentation, 2008. XI International Workshop on Complex Systems (March 17-20, Andalo, Trento, Italy).

Bo Jakobsen, Ulrich Lienert, Jonathan Almer, Wolfgang Pantleon, and Henning F. Poulsen. Properties and dynamics of bulk subgrains, probed in-situ using a novel X-ray diffraction method. Oral presentation, and abstract in collection, 2006. Fundamentals of Deformation and Annealing Symposium (September 5-7, Manchester, UK).

Bo Jakobsen, Henning F. Poulsen, Wolfgang Pantleon, Ulrich Lienert, Jonathan Almer, and Sarvjit D. Shastri. High angular resolution 3DXRD - observing bulk subgrains and their dynamics. Oral presentation, June 16 2006. APS User Science Seminars (Argonne, USA).

Bo Jakobsen, Ulrich Lienert, Jonathan Almer, Henning F. Poulsen, and Wolfgang Pantleon. Ultra-high angular resolution 3DXRD for observing bulk subgrains and their dynamic. Oral presentation, and abstract in collection, 2006. 14'th International Conference on the Strength of Materials ICSMA14 (June 4-9, Xi'an, China).

Bo Jakobsen, Henning F. Poulsen, Ulrich Lienert, Jonathan Almer, Sarvjit D. Shastri, Henning O. Sørensen, Carsten Gundlach, and Wolfgang Pantleon. Formation and subdivision of deformation structures. Oral presentation, and abstract in collection, 2006. 36th Danish Crystallographic Meeting, 8th DANSYNC Meeting & 4th DANSSK Meeting (May 16-17, Odense, Denmark).

Bo Jakobsen. Subgrain dynamics - presentation of a novel x-ray technique and first result. Oral presentation, Dec 12 2005. Risø scattering group (Risø, Denmark).

B. Jakobsen, U. Lienert, J. Almer, H.F. Poulsen, and W. Pantleon. Ultra-high angular resolution 3dxrd for observing bulk subgrains. Poster presentation, and abstract in collection (P13), 2005. 35th Danish Crystallographic Meeting & 7th DANSYNC Meeting (May 25-26, Sandbjerg Estate, Denmark).

Bo Jakobsen. In-situ investigation of developing dislocation structures by x-ray diffraction peak broadening. Oral presentation, Aug 2004. SKAL meeting (4D-group, Risø, Denmark).

B. Jakobsen, W. Pantleon, H.F. Poulsen, J. Almer, and U. Lienert. In-situ investigation of metal microstructures by x-ray diffraction. Poster presentation, 2004. Nordic Research Training Course on the Application of X-ray Synchrotron Radiation in Chemistry, Physics, Biology and Medicine (June 23-29, Sandbjerg Estate, Denmark).

K. Niss, B. Jakobsen, and N. B. Olsen. Connection between shear mechanical relaxation and dielectric relaxation in viscoelastic liquids. Poster presentation, 2003. Annual meeting of the Danish Physical Society (June 12-13, Nyborg, Denmark).

K. Niss and B. Jakobsen. Dielectric and shear mechanical relaxation in viscous liquids: Are they connected? Oral presentation, 2003. International workshop on Viscous Liquids and the Glass Transition (III) (May 9-11, Søminestationen, Denmark).

K. Niss and B. Jakobsen. Dielectric and shear mechanical relaxation in viscous liquids: Are they connected? Oral presentation, June 4 2003. RUC-Risø workshop on "Structure and dynamics of metals and glasses" (RUC, Denmark).

B. Jakobsen, K. Niss, and M. Brøns. Streamline topologies of the periodic flow behind a cylinder. Poster presentation, 2002. Annual meeting of the Danish Physical Society (May 30-31, Nyborg, Denmark).

Other papers

Seeing the strains in deformed metals. In APS Science 2008 - the annual report of the Advanced Photon Source at Argonne National Laboratory, ANL-08/24, pages 31-32. 2009. [ http ]

B. Jakobsen, U. Lienert, J. Almer, H.O. Sørensen, W. Pantleon, and H.F. Poulsen. Intermittent dynamics of dislocation structures during plastic deformation. In DANSYNC Annual Report. DANSYNC, 2005.

B. Jakobsen, U. Lienert, J. Almer, C. Gundlach, H.F. Poulsen, and W. Pantleon. Direct observation of individual subgrains in dislocation structures using ultra-high angular resolution x-ray diffraction. Unpublished draft for APS activity report 2004, used for GUP 4033 application, 2005.

B. Jakobsen, U. Lienert, J. Almer, H.F. Poulsen, and W. Pantleon. Direct observatio of the dynamics of individual dislocatio structures during plastic deformation. In DANSYNC Annual Report. DANSYNC, 2004.

B. Jakobsen, U. Lienert, J. Almer, H.F. Poulsen, and W. Pantleon. High reciprocal space resolution 3-dimensional x-ray diffraction. In Advanced Photon Source Activity Report 2003, number ANL-04/16. Argonne National Laboratory, December 2004. [ .PDF ]