Tidligere arrangementer - Side 135
The slow growth of a crack in windshield represents a mechano-chemical process: The stress at the tip of the fracture is not high enough to cause rapid fracture motion. Instead, fracture motion is determined by the diffusion of hydrogen to the crack tip, where it weakens the material, leading to crack tip propagation. The velocity of the fracture depends on the coupling between deformation, transport, and reactions. Similar coupled processes determine the rate of many reaction processes of geological relevance, such as weathering and carbonation during mineralogical CO2 sequestration. We have developed numerical model that allow us to address mechano-chemical processes during fluid infiltration. The model demonstrates that fracturing assisted reaction fronts in shrinking materials propagate with a constant velocity and width, and that the reaction rate in volume increasing reactions may be accelerated by feedback processes between fluid flow, mechanical deformation, and reactions.
Anders Malthe-S?renssen is professor at the Department of Physics, working at the center for Physics of Geological Processes
Den ledende forskeren og anerkjente formidleren professor Richard A. Fortey ved Natural History Museum, London, gjester NHM med forelesningen "The fossil record since Darwin".
Friday seminar by Anna Qvarnstr?m.
Fredagskollokvium
Jan Erik H. Weber, Department of Geosciences, University of Oslo G?ran Brostr?m, Norwegian Meteorological Institute, Oslo Nonlinear density-driven convection in a conditionally unstable fluid is studied theoretically. The novelty here is that the destabilizing basic density gradient is expressed in terms of the vertical perturbation velocity through a unit step function. This is done by introducing a one-way source step function due to phase transitions in the equation for the perturbation density. Then we can model the fact that the density-gradient is unstable when the perturbation vertical velocity is upward (positive), and stable when the vertical perturbation velocity is downward (negative), characterizing conditional stability. Linear analytical solutions as well as numerical results for nonlinear two-dimensional steady convection are presented.
Jan Erik Weber is professor at Department of Geosciences
Fredagskollokvium
Det tredje m?te i HR-nettverket tok for seg HR-m?linger. Trenger vi slike m?linger? Hvordan f?lger vi opp resultatene, og er vi profesjonelle nok til ? kunne behandle alle ansatte med integritet og verdighet?
Friday seminar by Stephen H. Schneider and Terry L. Root
Museum collections of fungi - social aspects and value for research, public outreach and nature resource assessment.
Professor Avraham Levy vil forelese over følgende emne: Genetic and epigenetic mechanisms of gene expression rewiring in hybrids and polyploids
Museum collections of fungi - social aspects and value for research, public outreach and nature resource assessment.
Friday seminar by Jon Fjelds?.
Friday seminar by Bernard Cazelles.
Fredagskollokvium
Extra CEES/MERG seminar by Hanna Johannesson.
Friday seminar by Homayoun C. Bagheri
Det andre m?te i HR-nettverket tok for seg strategisk kompetansestyring og utvikling. Vi fikk presentert kompetansearbeidet i to virksomheter: Norges 亚博娱乐官网_亚博pt手机客户端登录sr?d og NAV. Professor Roald Bj?rklund ved Universitetet i Oslo kommenterte innleggene og var fasilitator for gruppearbeid og plenumsdiskusjon.
Friday seminar by Erik Svensson
Fredagskollokvium
Extra CEES Seminar by Melanie Stiffel
Friday seminar by Stefan van Dongen
Fredagskollokvium
Fredagskollokvium