Now showing items 1-20 of 1497

    • 2 μm solid-state laser mode-locked by single-layer graphene 

      Lagatsky, A. A.; Sun, Z.; Kulmala, T. S.; Sundaram, R. S.; Milana, S.; Torrisi, F.; Antipov, O. L.; Lee, Y.; Ahn, J. H.; Brown, C. T. A.; Sibbett, W.; Ferrari, A. C. (2013-01-07) - Journal article
      We report a 2 μm ultrafast solid-state Tm : Lu2O3 laser, mode-locked by single-layer graphene, generating transform-limited similar to 410 fs pulses, with a spectral width similar to 11.1 nm at 2067 nm. The maximum average ...
    • The 2014-2017 outburst of the young star ASASSN-13db. A time-resolved picture of a very-low-mass star between EXors and FUors 

      Sicilia-Aguilar, A.; Oprandi, A.; Froebrich, D.; Fang, M.; Prieto, J. L.; Stanek, K.; Scholz, A.; Kochanek, C. S.; Henning, Th.; Gredel, R.; Holoien, T. W.-S.; Rabus, M.; Shappee, B. J.; Billington, S. J.; Campbell-White, J.; Zegmott, T. J. (2017-11) - Journal article
      Context. ASASSN-13db is a M5-type star with a protoplanetary disk, the lowest mass star known to experience accretion outbursts. Since its discovery in 2013, it has experienced two outbursts, the second of which started ...
    • A 220 GHz 3D imaging radar with sub-cm3 voxel resolution for security applications 

      Robertson, Duncan Alexander; MacFarlane, David Graham; Bryllert, Tomas (IEEE, 2017-01-19) - Conference item
      Radars operating at high millimetre and sub-millimetre wave frequencies are promising candidates for security applications such as people screening since they offer the possibility to form 3D images through clothing with ...
    • 220GHz wideband 3D imaging radar for concealed object detection technology development and phenomenology studies 

      Robertson, Duncan Alexander; Macfarlane, David Graham; Bryllert, Tomas (SPIE, 2016-05-12) - Conference item
      We present a 220 GHz 3D imaging ‘Pathfinder’ radar developed within the EU FP7 project CONSORTIS (Concealed Object Stand-Off Real-Time Imaging for Security) which has been built to address two objectives: (i) to de-risk ...
    • 2′-alkynylnucleotides : a sequence- and spin label-flexible strategy for EPR Spectroscopy in DNA 

      Haugland, Marius M.; El-Sagheer, Afaf H.; Porter, Rachel J.; Peña, Javier; Brown, Tom; Anderson, Edward A.; Lovett, Janet E. (2016-07-27) - Journal article
      Electron paramagnetic resonance (EPR) spectroscopy is a powerful method to elucidate molecular structure through the measurement of distances between conformationally well-defined spin labels. Here we report a sequence-flexible ...
    • 3-2: Invited paper: Color on Demand - Color-tunable OLEDs for lighting and displays 

      Fröbel, Markus; Schwab, Tobias; Kliem, Mona; Lenk, Simone; Leo, Karl; Reineke, Sebastian; Gather, Malte C. (2017) - Journal article
      A device concept for highly efficient OLEDs is introduced that allows to tune the emission color of the device over a broad range of the CIE color gamut. The approach exploits the different polarities of the positive and ...
    • 3D laser nano-printing on fibre paves the way for super-focusing of multimode laser radiation 

      Sokolovskii, Grigorii S.; Melissinaki, Vasileia; Fedorova, Ksenia A.; Dudelev, Vladislavv; Losev, Sergey N.; Bougrov, Vladislav E.; Sibbett, Wilson; Farsari, Maria; Rafailov, Edik U. (2018-10-02) - Journal article
      Multimode high-power laser diodes suffer from inefficient beam focusing, leading to a focal spot 10-100 times greater than the diffraction limit. This inevitably restricts their wider use in 'direct-diode' applications in ...
    • 3D Monte Carlo radiation transfer modelling of photodynamic therapy 

      Campbell, Catherine Louise; Christison, C.; Brown, C Tom A; Wood, Kenny; Valentine, Ronan Martin; Moseley, H. (SPIE, 2015-06) - Conference item
      The effects of ageing and skin type on Photodynamic Therapy (PDT) for different treatment methods have been theoretically investigated. A multilayered Monte Carlo Radiation Transfer model is presented where both daylight ...
    • 3D PiC code investigations of Auroral Kilometric Radiation mechanisms 

      Gillespie, K. M.; McConville, S. L.; Speirs, D. C.; Ronald, K.; Phelps, A. D. R.; Bingham, R.; Cross, A. W.; Robertson, C. W.; Whyte, C. G.; He, W.; Vorgul, I.; Cairns, R. A.; Kellett, B. J. (IOP Publishing Ltd., 2014) - Conference item
      Efficient (similar to 1%) electron cyclotron radio emissions are known to originate in the X mode from regions of locally depleted plasma in the Earths polar magnetosphere. These emissions are commonly referred to as the ...
    • 50-1: Invited paper: Recent advances in measuring and understanding the influence of molecular alignment on the light extraction efficiency of OLEDs 

      Murawski, Caroline; Graf, Arko; Liehm, Philipp; Neferu, Ana; Zysman-colman, Eli; Gather, Malte C. (2017) - Journal item
      We review recent progress in controlling the alignment of the transition dipole moment of electroluminescent molecules to maximize the light extraction efficiency in OLEDs. Particular focus devoted to ways of measuring ...
    • 94 GHz pulsed coherent radar for high power amplifier evaluation 

      Robertson, Duncan Alexander; Hunter, Robert Iain; Gallacher, Thomas (SPIE, 2016-05-12) - Conference item
      We present the design and characterization of a 94 GHz pulsed coherent radar to be used for the evaluation and demonstration of novel wideband, high power vacuum tube amplifier technology. The radar is designed to be fully ...
    • Absence of critical exponents in ferroelectrics : experiments of Hilczer and theory of Levanyuk and Sigov 

      Scott, J. F. (2016-08-02) - Journal article
      The pioneering breakthrough of Bozena Hilczer and her coworkers showed that the so-called critical phenomena in many ferroelectric crystals are entirely produced by defects. She studied gadolinium aluminum sulphate hexahydrate ...
    • Absence of giant spin splitting in the two-dimensional electron liquid at the surface of SrTiO3 (001) 

      McKeown Walker, S; Riccò, S; Bruno, F Y; de la Torre, A; Tamai, A; Golias, E; Varykhalov, A; Marchenko, D; Hoesch, M; Bahramy, M S; King, Philip David; Sánchez-Barriga, J; Baumberger, F (2016-06-22) - Journal article
      We reinvestigate the putative giant spin splitting at the surface of SrTiO3 reported by Santander-Syro et al. [Nature Mat. 13, 1085 (2014)]. Our spin- and angle-resolved photoemission experiments on fractured (001) oriented ...
    • Absorption cross-sections of hole polarons in glassy and beta-phase polyfluorene 

      Montilla, Francisco; Ruseckas, Arvydas; Samuel, Ifor David William (2013-10-14) - Journal article
      Absorption induced by electrochemically injected holes is studied in poly-9,9-dioctylfluorene (PFO) films. Injected charges form positive polarons which are delocalised over four fluorene units in the glassy phase and about ...
    • The abundance of ultra-diffuse galaxies from groups to clusters : UDGs are relatively more common in more massive haloes 

      Burg, Remco F. J. van der; Hoekstra, Henk; Muzzin, Adam; Sifon, Cristobal; Viola, Massimo; Bremer, Malcolm N.; Brough, Sarah; Driver, Simon P.; Erben, Thomas; Heymans, Catherine; Hildebrandt, Hendrik; Holwerda, Benne W.; Klaes, Dominik; Kuijken, Konrad; McGee, Sean; Nakajima, Reiko; Napolitano, Nicola; Norberg, Peder; Taylor, Edward N.; Valentijn, Edwin (2017-11) - Journal article
      In recent years, many studies have reported substantial populations of large galaxies with low surface brightness in local galaxy clusters. Various theories that aim to explain the presence of such ultra-diffuse galaxies ...
    • AC losses in superconducting niobium 

      Al-Huseini, Fahad A. (University of St Andrews, 1973) - Thesis
      This thesis is concerned with measurements of alternating field losses in cylindrical rods of niobium in its superconducting state. Six samples have been investigated each with a different surface condition, Magnetization ...
    • Accretion disc time lag distributions : applying CREAM to simulated AGN light curves 

      Starkey, David; Horne, Keith; Villforth, C. (2016-02-21) - Journal article
      Active galactic nuclei (AGN) vary in their brightness across all wavelengths. Moreover, longer wavelength ultraviolet-optical continuum light curves appear to be delayed with respect to shorter wavelength light curves. A ...
    • Accretion disk reverberation with Hubble Space Telescope observations of NGC 4593 : evidence for diffuse continuum lags 

      Cackett, Edward M.; Chiang, Chia-Ying; McHardy, Ian; Edelson, Rick; Goad, Michael R.; Horne, Keith; Korista, Kirk T. (2018-04-12) - Journal article
      The Seyfert 1 galaxy NGC 4593 was monitored spectroscopically with the Hubble Space Telescope as part of a reverberation mapping campaign that also included Swift, Kepler and ground-based photometric monitoring. During ...
    • Accurate astrophysical parameters for algol-type binary stars 

      Maxted, P. F. L. (University of St Andrews, 1995) - Thesis
      We present new, accurate astrophysical parameters for both components of the six short-period Algol-type binary stars RZ Cas, AT Peg, TX UMa, AF Gem, RU UMi and HU Tau. The accuracy of the astrophysical parameters is ensured ...
    • An acoustical investigation of the concert harp 

      Bell, Alexander J. (University of St Andrews, 1988) - Thesis
      This thesis is a report of acoustical research on the concert harp. The harp has an established place in the symphony orchestra and is reacquiring its role as a solo chamber instrument that it had before the development ...