Now showing items 12336-12355 of 13150

  • Ubiquitous formation of bulk Dirac cones and topological surface states from a single orbital manifold in transition-metal dichalcogenides 

    Bahramy, M. S.; Clark, O. J.; Yang, B.-J.; Feng, J.; Bawden, L.; Riley, J. M.; Markovic, I.; Mazzola, F.; Sunko, V.; Biswas, D.; Cooil, S. P.; Jorge, M.; Wells, J. W.; Leandersson, M.; Balasubramanian, T.; Fujii, J.; Vobornik, I.; Rault, J.; Kim, T.K.; Hoesch, M.; Okawa, K.; Asakawa, M.; Sasagawa, T.; Eknapakul, T.; Meevasana, W.; King, P. D. C. (2018-01) - Journal article
    Transition-metal dichalcogenides (TMDs) are renowned for their rich and varied bulk properties, while their single-layer variants have become one of the most prominent examples of two-dimensional materials beyond graphene. ...
  • The UK Centre for Astrobiology : a virtual astrobiology centre. Accomplishments and lessons learned, 2011-2016 

    Cockell, Charles S.; Biller, Beth; Bryce, Casey; Cousins, Claire; Direito, Susana; Forgan, Duncan; Fox-Powell, Mark; Harrison, Jesse; Landenmark, Hanna; Nixon, Sophie; Payler, Samuel J.; Rice, Ken; Samuels, Toby; Schwendner, Petra; Stevens, Adam; Nicholson, Natasha; Wadsworth, Jennifer (2018-01-29) - Journal article
    The UK Centre for Astrobiology (UKCA) was set up in 2011 as a virtual center to contribute to astrobiology research, education, and outreach. After 5 years, we describe this center and its work in each of these areas. Its ...
  • UK Citizen’s Council for the future : creating new spaces for citizens’ voices and long-term thinking in politics 

    Sustainable Development Commission (Sustainable Development Commission, 2008-06-23) - Report
    This paper sets out the rationale and requirement for a citizens' council, a new space for UK citizens to engage with and inform long-term political thinking.
  • UK Climate Change Programme : a policy audit 

    Sustainable Development Commission (Sustainable Development Commission, 2003-02) - Report
    In this audit we commend the inclusion in the UK Climate Change Programme of specific and challenging targets, and measures to achieve them.
  • A UK indicator of education for sustainable development 

    Huckle, John; Sustainable Development Commission (Sustainable Development Commission, 2006-03) - Report
    Report on workshops consulting members of the education community on their preferred approach to the indicator announced in the UK strategy for sustainable development, 'Securing the Future'.
  • UK national print media coverage of sexual and gender-based violence (SGBV) against refugee women in Syrian refugee camps 

    Özdemir, Özlem (Centre for Syrian Studies, School of International Relations, University of St Andrews, 2015-11-16) - Journal article
    The vulnerability of Syrian refugee women does not draw the public attention it deserves. In this regard, media coverage thus has an important role to illustrate these women’s vulnerable situation and to create public ...
  • UK population norms for the modified dental anxiety scale with percentile calculator : adult dental health survey 2009 results 

    Humphris, Gerald Michael; Crawford, John; Hill, Kirsty; Gilbert, Angela; Freeman, Ruth (2013-06-24) - Journal article
    Background: A recent UK population survey of oral health included questions to assess dental anxiety to provide mean and prevalence estimates of this important psychological construct. Methods: A two-stage cluster sample ...
  • UKSG Managing Open Access: London | Managing OA: pain points and workflows | University of St Andrews: Case study 

    Aucock, Janet (University of St Andrews Library, 2014-05-20) - Conference item
    This is the presentation delivered at a seminar in London 20 May 2014 Managing OA: pain points and workflows. Along with other stakeholders, St Andrews presented its case study on the OA model and impact on processes and ...
  • Ultra short laser pulses and coupled-cavity mode locking in a KCI:TI colour-centre laser 

    Zhu, Xiaonong (University of St Andrews, 1991-07) - Thesis
    The basic principles of generation, characterisation and propagation of ultrashort laser pulses and related experimental studies of mode locking of a coupled-cavity KC1:Ti colour-centre laser are presented. Extensive ...
  • Ultra-high foraging rates of harbor porpoises make them vulnerable to anthropogenic disturbance 

    Wisniewska, Danuta Maria; Johnson, Mark; Teilmann, Jonas; Rojano-Doñate, Laia; Shearer, Jeanne; Sveegaard, Signe; Miller, Lee A.; Siebert, Ursula; Madsen, Peter Teglberg (2016-06-06) - Journal article
    Summary. The question of how individuals acquire and allocate resources to maximize fitness is central in evolutionary ecology. Basic information on prey selection, search effort, and capture rates are critical for ...
  • Ultra-low-noise frequency synthesis, comparison and dissemination using femtosecond optical frequency combs 

    Lessing, Maurice (University of St Andrews, 2016-06-22) - Thesis
    This thesis presents research into ultra-low noise photonic microwave synthesis and the development of a novel, frequency comb-based, fibre optic time transfer technique. The focus in the first area is on reducing the ...
  • Ultra-portable explosives sensor based on a CMOS fluorescence lifetime analysis micro-system 

    Wang, Yue; Rae, Bruce R.; Henderson, Robert K.; Gong, Zheng; Mckendry, Jonathan; Gu, Erdan; Dawson, Martin D.; Turnbull, Graham A.; Samuel, Ifor D. W. (2011-09) - Journal article
    This work explores the use of a green-light-emitting copolymer as a chemosensor to detect nitroaromatic-based explosive vapors by recording photoluminescence (PL) and time-resolved PL decay. We show successful detection ...
  • An ultra-short period rocky super-Earth with a secondary eclipse and a Neptune-like companion around K2-141 

    Malavolta, Luca; Mayo, Andrew W.; Louden, Tom; Rajpaul, Vinesh M.; Bonomo, Aldo S.; Buchhave, Lars A.; Kreidberg, Laura; Kristiansen, Martti H.; Lopez-Morales, Mercedes; Mortier, Annelies; Vanderburg, Andrew; Coffinet, Adrien; Ehrenreich, David; Lovis, Christophe; Bouchy, Francois; Charbonneau, David; Ciardi, David R.; Collier Cameron, Andrew; Cosentino, Rosario; Crossfield, Ian J. M.; Damasso, Mario; Dressing, Courtney D.; Dumusque, Xavier; Everett, Mark E.; Figueira, Pedro; Fiorenzano, Aldo F. M.; Gonzales, Erica J.; Haywood, Raphaëlle D.; Harutyunyan, Avet; Hirsch, Lea; Howell, Steve B.; Johnson, John Asher; Latham, David W.; Lopez, Eric; Mayor, Michel; Micela, Giusi; Molinari, Emilio; Nascimbeni, Valerio; Pepe, Francesco; Phillips, David F.; Piotto, Giampaolo; Rice, Ken; Sasselov, Dimitar; Ségransan, Damien; Sozzetti, Alessandro; Udry, Stéphane; Watson, Chris (2018-02-09) - Journal article
    Ultra-short period (USP) planets are a class of low mass planets with periods shorter than one day. Their origin is still unknown, with photo-evaporation of mini-Neptunes and in-situ formation being the most credited ...
  • Ultra-small photoluminescent silicon-carbide nanocrystals by atmospheric-pressure plasmas 

    Askari, Sadegh; Ul Haq, Atta; Macias-Montero, Manuel; Levchenko, Igor; Yu, Fengjiao; Zhou, Wuzong; Ostrikov, Kostya (Ken); Maguire, Paul; Svrcek, Vladimir; Mariotti, Davide (2016-10-21) - Journal article
    Highly size-controllable synthesis of free-standing perfectly crys- talline silicon carbide nanocrystals has been achieved for the first time through a plasma-based bottom-up process. This low-cost, scalable, ligand-free ...
  • Ultracompact (3 μm) silicon slow-light optical modulator 

    Opheij, Aron; Rotenberg, Nir; Beggs, Daryl M.; Rey, Isabella H.; Krauss, Thomas F.; Kuipers, L. (2013-12-18) - Journal article
    Wavelength-scale optical modulators are essential building blocks for future on-chip optical interconnects. Any modulator design is a trade-off between bandwidth, size and fabrication complexity, size being particularly ...
  • Ultracompact 160 Gbaud all-optical demultiplexing exploiting slow light in an engineered silicon photonic crystal waveguide 

    Corcoran, Bill; Pelusi, Mark D.; Monat, Christelle; Li, Juntao; O'Faolain, Liam; Krauss, Thomas F.; Eggleton, Benjamin J. (2011-05-01) - Journal article
    We demonstrate all-optical demultiplexing of a high-bandwidth, time-division multiplexed 160 Gbit/s signal to 10 Gbit/s channels, exploiting slow light enhanced four-wave mixing in a dispersion engineered, 96 mu m long ...
  • Ultracompact all-optical XOR logic gate in a slow-light silicon photonic crystal waveguide 

    Husko, C.; Vo, T. D.; Corcoran, B.; Li, Juntao; Krauss, Thomas Fraser; Eggleton, B. J. (2011-10-10) - Journal article
    We demonstrate an ultracompact, chip-based, all-optical exclusive-OR (XOR) logic gate via slow-light enhanced four-wave mixing (FWM) in a silicon photonic crystal waveguide (PhCWG). We achieve error-free operation (<10(-9)) ...
  • Ultrafast adiabatic manipulation of slow light in a photonic crystal 

    Kampfrath, T.; Beggs, Daryl Matthew; White, Tom P; Melloni, A.; Krauss, Thomas Fraser; Kuipers, L. (2010-04-27) - Journal article
    We demonstrate by experiment and theory that a light pulse propagating through a Si-based photonic-crystal waveguide is adiabatically blueshifted when the refractive index of the Si is reduced on a femtosecond time scale. ...
  • Ultrafast all-optical order-to-chaos transition in silicon photonic crystal chips 

    Bruck, Roman; Liu, Changxu; Muskens, Otto L; Fratalocchi, Andrea; Di Falco, Andrea (2016-07) - Journal article
    The interaction of light with nanostructured materials provides exciting new opportunities for investigating classical wave analogies of quantum phenomena. A topic of particular interest forms the interplay between wave ...
  • Ultrafast band structure control of a two-dimensional heterostructure 

    Ulstrup, Søren; Grubišić Čabo, Antonija; Miwa, Jill A; Riley, Jonathon Mark; Grønborg, Signe S; Johannsen, Jens C; Cacho, Cephise; Alexander, Oliver; Chapman, Richard T; Springate, Emma; Bianchi, Mario; Dendzik, Maciej; Lauritsen, Jeppe V; King, Philip David; Hofmann, Philip (2016-06-28) - Journal article
    The electronic structure of two-dimensional (2D) semiconductors can be signicantly altered by screening effects, either from free charge carriers in the material itself, or by environmental screening from the surrounding ...