Now showing items 7522-7541 of 8023

  • 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 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-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 ...
  • 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 dynamics in InAs quantum dot and GaInNAs quantum well semiconductor heterostructures 

    Malins, David B (University of St Andrews, 2008-06-24) - Thesis
    The quantum confined Stark effect (QCSE) and ultrafast absorption dynamics near the bandedge have been investigated in p-i-n waveguides comprising quantum confined heterostructures grown on GaAs substrates, for emission ...
  • Ultrafast dynamics of massive Dirac fermions in bilayer graphene 

    Ulstrup, S.; Johannsen, J.C.; Cilento, F.; Miwa, J.A.; Crepaldi, A.; Zacchigna, M.; Cacho, C.; Chapman, R.; Springate, E.; Mammadov, S.; Fromm, F.; Raidel, C.; Seyller, T.; Parmigiani, F.; Grioni, M.; King, P.D.C.; Hofmann, P. (2014-06-25) - Journal article
    Bilayer graphene is a highly promising material for electronic and optoelectronic applications since it is supporting massive Dirac fermions with a tunable band gap. However, no consistent picture of the gap's effect on ...
  • Ultrafast high-repetition-rate waveguide lasers 

    Shepherd, David; Choudhary, Amol; Lagatsky, Alexander Alexandrovich; Kannan, P; Beecher, S; Eason, Robert; Mackenzie, Jacob; Feng, Xian; Sibbett, Wilson; Brown, C Tom A (2016-03) - Journal article
    We report on progress in the field of integrated mode-locked waveguide lasers with an emphasis on compact monolithic designs producing picosecond and femtosecond optical pulses at multi-GHz repetition rates.
  • Ultrafast organic lasers and solid-state amplifiers 

    Goossens, Mark (University of St Andrews, 2007-06-19) - Thesis
    This thesis presents an investigation of the lasing dynamics and optical amplification devices using conjugated polymers. Spectroscopic studies of conjugated polymers and dendrimers were also performed. Conjugated polymers ...
  • Ultrafast photophysics of iridium complexes 

    Hedley, Gordon J. (University of St Andrews, 2010-11-30) - Thesis
    This thesis presents ultrafast photophysical measurements on a number of phosphorescent iridium complexes and establishes relationships between the relaxation rates and the vibrational properties of the material. When ...
  • Ultrafast tilting of the dispersion of a photonic crystal and adiabatic spectral compression of light pulses 

    Beggs, Daryl M.; Krauss, Thomas F.; Kuipers, L.; Kampfrath, Tobias (2012-01-18) - Journal article
    We demonstrate, by theory and experiment, the ultrafast tilting of the dispersion curve of a photonic-crystal waveguide following the absorption of a femtosecond pump pulse. By shaping the pump-beam cross section with a ...
  • Ultrafast tunable optical delay line based on indirect photonic transitions 

    Beggs, Daryl Matthew; Rey, Isabella Helen; Kampfrath, Tobias; Rotenberg, Nir; Kuipers, L.; Krauss, Thomas Fraser (2012-05-21) - Journal article
    We introduce the concept of an indirect photonic transition and demonstrate its use in a dynamic delay line to alter the group velocity of an optical pulse. Operating on an ultrafast time scale, we show continuously tunable ...
  • Ultrashort laser pulse shaping for novel light fields and experimental biophysics 

    Rudhall, Andrew Peter (University of St Andrews, 2013-06-26) - Thesis
    Broadband spectral content is required to support ultrashort pulses. However this broadband content is subject to dispersion and hence the pulse duration of corresponding ultrashort pulses may be stretched accordingly. I ...
  • Ultrashort-pulse generation from quantum-dot semiconductor diode lasers 

    Cataluna, Maria Ana (University of St Andrews, 2008-06) - Thesis
    In this thesis, novel regimes of mode locking in quantum dot semiconductor laser diodes have been investigated by exploiting the unique features offered by quantum dots. Using an unconventional approach, the role of excited ...