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Browsing Greinar- HÍ by Department "Science Institute (UI)"

Browsing Greinar- HÍ by Department "Science Institute (UI)"

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  • Bjarnason, Ingi Þorleifur (Hið íslenska náttúrufræðifélag, 1997)
    Heitur reitur er landsvæði sem einkennist af mikilli eldvirkni og jarðhita og stendur hátt yfir umhverfið. Ísland er einn af stærstu heitu reitum jarðar og gnæfir 2-4 km yfir venjulega hæð Norður-Atlantshafshryggjarins sem gengur í gegnum landið. Markmið ...
  • Bjarnason, Ingi Þorleifur; Cowie, Patience; Anders, Mark H.; Seeber, Leonardo; Scholz, Christopher H. (The Seismological Society of America, 1993)
    We have mapped in detail surface ruptures of the 1912 magnitude 7.0 strike-slip earthquake in south Iceland. This earthquake ruptured fresh basalt flows that had covered the pre-existing fault. The observed style of surface fracturing closely matches ...
  • Zafar, T.; Elm Heintz, Kasper; Fynbo, J. P. U.; Malesani, D.; Bolmer, J.; Ledoux, C.; Arabsalmani, M.; Kaper, L.; Campana, S.; Starling, R. L. C.; Selsing, J.; Kann, D. A.; Postigo, A. de Ugarte; Schweyer, T.; Christensen, L.; Møller, P.; Japelj, J.; Perley, D.; Tanvir, N. R.; D’Avanzo, P.; Hartmann, D. H.; Hjorth, J.; Covino, S.; Sbarufatti, B.; Jakobsson, P.; Izzo, L.; Salvaterra, R.; D’Elia, V.; Xu, D. (American Astronomical Society, 2018-06-18)
    The ultraviolet (UV) extinction feature at 2175 Å is ubiquitously observed in the Galaxy but is rarely detected at high redshifts. Here we report the spectroscopic detection of the 2175 Å bump on the sightline to the γ-ray burst (GRB) afterglow GRB ...
  • Schneiderbauer, Lukas; Sybesma, Watse; Thorlacius, Larus (Springer Science and Business Media LLC, 2020-07-01)
    We adapt the complexity as action prescription (CA) to a semi-classical model of two-dimensional dilaton gravity and determine the rate of increase of holographic complexity for an evaporating black hole. The results are consistent with our previous ...
  • Kibis, Oleg; Dini, Kevin Tanguy Elian; Iorsh, Ivan; Shelykh, Ivan (American Physical Society (APS), 2017-03-01)
    We demonstrate theoretically that the interaction of electrons in gapped Dirac materials (gapped graphene and transition-metal dichalchogenide monolayers) with a strong off-resonant electromagnetic field (dressing field) substantially renormalizes the ...
  • Tapia Rodriguez, Lucy E.; Walker, Paul M.; Sigurdsson, Helgi; Royall, Ben; Farrer, Ian; Ritchie, David A.; Yulin, Alexey V.; Shelykh, Ivan; Skolnick, Maurice S.; Krizhanovskii, Dmitry N. (The Optical Society, 2019-04-03)
    Using a sub-millimeter exciton-polariton waveguide suitable for integrated photonics, we experimentally demonstrate nonlinear modulation of pico-Joule pulses at the same time as amplification sufficient to compensate the system losses. By comparison ...
  • Marques, Y.; Obispo, A. E.; Ricco, L. S.; de Souza, M.; Shelykh, Ivan; Seridonio, A. C (American Physical Society (APS), 2017-07-11)
    The ground state of the diatomic molecules in nature is inevitably bonding, and its first excited state is antibonding. We demonstrate theoretically that, for a pair of distant adatoms placed buried in three-dimensional-Dirac semimetals, this natural ...
  • Hoffmann, Markus; Zimmermann, Bernd; Müller, Gideon Philipp; Schürhoff, Daniel; Kiselev, Nikolai S.; Melcher, Christof; Blügel, Stefan (Springer Nature, 2017-08-21)
    Chiral magnets are an emerging class of topological matter harboring localized and topologically protected vortex-like magnetic textures called skyrmions, which are currently under intense scrutiny as an entity for information storage and processing. ...
  • Nosikov, I.A.; Klimenko, M.V.; Bessarab, Pavel; Zhbankov, G.A (Elsevier BV, 2017-07)
    Point-to-point ray tracing is an important problem in many fields of science. While direct variational methods where some trajectory is transformed to an optimal one are routinely used in calculations of pathways of seismic waves, chemical reactions, ...
  • Bjarnason, Ingi Þorleifur; Menke, William (Society of Exploration Geophysicists, 1993-07)
    Cross-borehole tomography suffers from a well-known problem of data incompleteness: the limited ray coverage dictated by the poor experimental geometry implies that certain features of the velocity field are not determined by the data. Construction of ...
  • Wolfe, Cecily J.; Bjarnason, Ingi Þorleifur; VanDecar, John C.; Solomon, Sean C. (Wiley-Blackwell, 2002)
    Earlier inversions of body wave delay-time data recorded during the ICEMELT portable broadband experiment imaged a cylindrical plume-like low-velocity anomaly extending to at least 400 km depth beneath Iceland, but the depth extent of the anomaly ...
  • Mantovan, R.; Fallica, R.; Mokhles Gerami, A.; Mølholt, T. E.; Wiemer, C.; Longo, M.; Gunnlaugsson, Haraldur; Johnston, K.; Masenda, H.; Naidoo, D.; Ncube, M.; Bharuth-Ram, K.; Fanciulli, M.; Gíslason, Hafliði Pétur; Langouche, G.; Olafsson, Sveinn; Weyer, G. (Springer Nature, 2017-08-15)
    The underlying mechanism driving the structural amorphous-to-crystalline transition in Group VI chalcogenides is still a matter of debate even in the simplest GeTe system. We exploit the extreme sensitivity of 57Fe emission Mössbauer spectroscopy, ...
  • Jagtap, Anil P.; Geiger, Michel-Andreas; Stöppler, Daniel; Orwick-Rydmark, Marcella; Oschkinat, Hartmut; Sigurdsson, Snorri (Royal Society of Chemistry (RSC), 2016)
    Dynamic nuclear polarization (DNP) is an efficient method to overcome the inherent low sensitivity of magic-angle spinning (MAS) solid-state NMR. We report a new polarizing agent (bcTol), designed for biological applications, that yielded an enhancement ...
  • Juliusson, Haraldur Y.; Segler, Anna-Lena J.; Sigurdsson, Snorri (Wiley, 2019-06-17)
    Oligonucleotides containing nitroxide spin labels, used in biophysical studies of nucleic acids, are frequently prepared by chemical synthesis. However, during the synthesis of spin‐labeled oligonucleotides, the nitroxides are partially reduced to the ...
  • Caputo, Andrea; Zavala Franco, Jesus; Blas, Diego (Elsevier BV, 2018-03)
    As a binary pulsar moves through a wind of dark matter particles, the resulting dynamical friction modifies the binary’s orbit. We study this effect for the double disk dark matter (DDDM) scenario, where a fraction of the dark matter is dissipative ...
  • Lowe, David A.; Thorlacius, Larus (Springer Nature, 2018-01)
    Holographic theories representing black holes are expected to exhibit quantum chaos. We argue if the laws of quantum mechanics are expected to hold for observers inside such black holes, then such holographic theories must have a mean field approximation ...
  • Amado, Irene; Sundborg, Bo; Thorlacius, Larus; Wintergerst, Nico (Springer Nature, 2018-03)
    The emergent nature of spacetime geometry and black holes can be directly probed in simple holographic duals of higher spin gravity and tensionless string theory. To this end, we study time dependent thermal correlation functions of gauge invariant ...
  • De Pasquale, Massimiliano; Page, Mathew; Kann, David; Oates, Samantha; Schulze, Steve; Zhang, Bing; Cano, Zach; Gendre, Bruce; Malesani, Daniele; Rossi, Andrea; Gehrels, Neil; Troja, Eleonora; Piro, Luigi; Boër, Michel; Stratta, Giulia (MDPI AG, 2017-01-16)
    GRB 130427A was the most luminous gamma-ray burst detected in the last 30 years. With an isotropic energy output of 8.5 x 10(53) erg and redshift of 0.34, it combined very high energetics with a relative proximity to Earth in an unprecedented way. ...
  • Marques, Y.; Mizobata, W. N.; Oliveira, R. S.; de Souza, M.; Figueira, M. S.; Shelykh, Ivan; Seridonio, A. C. (Springer Science and Business Media LLC, 2019-06-11)
    We demonstrate that chirality of the electron scattering in Weyl semimetals leads to the formation of magnetic chemical bonds for molecular states of a pair of impurities. The efect is associated with the presence of time-reversal symmetry breaking ...
  • Hjörleifsson, Jens G; Ásgeirsson, Bjarni (Wiley, 2018-12-21)
    Most enzymes are homodimers or higher order multimers. Cold‐active alkaline phosphatase from Vibrio splendidus (VAP) transitions into a dimer with very low activity under mild denaturation conditions. The desire to understand why this dimer fails to ...