Browsing Mathemateg a Ffiseg / Mathematics & Physics by Title

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  • Iantchenko, A.; Jakubaßa-Amundsen, D. H. (2003-12)
    The Jansen-Heß operator is an approximate (pseudo-)relativistic no-pair Hamiltonian in the Furry picture which is used in the physics literature to describe heavy atoms. Within the single-particle Coulomb model we prove ...
  • Janiaud, Eric; Cox, Simon John (2008-09-01)
    Bubble monolayers are widely used to probe the rheology of aqueous foams, and liquid content plays an important role in the response. We analyse the liquid distribution within three different types of two-dimensional foam, ...
  • Kellett, B.; Dunkin, S. K.; Grande, Manuel (2001)
    Mercury is the little known innermost terrestrial planet. A number of significant questions remain unanswered. We describe areas in which a compact imaging X-ray spectrometer could make a valuable contribution. It can ...
  • Noakes, T. C. Q.; Bailey, P.; Jenkins, Tudor; Hayton, D. J. (2002-06)
    Medium energy ion scattering, Fourier transform infrared spectroscopy and spectroscopic ellipsometry measurements have been performed on thermally grown SiO2 layers on 4H silicon carbide. The data suggest the presence of ...
  • McGlynn, Andrew G. (Aberystwyth UniversityMathematical and Physical Sciences, 2010-02)
    This thesis reports upon synchrotron based luminescence studies of wide band gap semi-conductors and organic thin films. The optical and structural electronic properties of cubic and hexagonal boron nitride have been ...
  • Cross, Rachel Elizabeth (Aberystwyth University, 2015)
    This thesis presents work undertaken in the design, build, characterisation and first results of a new instrument for the optical characterisation of wide band gap materials by their luminescence. Optical spectroscopy is ...
  • Gough, John E. (World Scientific, 2008-11-12)
    We consider the problem of optimal feedback control of a quantum system with linear dynamics undergoing continual non-demolition measurement of position and/or momentum, or both together. Specically, we show that a stable ...
  • Banaszek, David (Aberystwyth UniversityMathematical and Physical Sciences, 2009)
    The linear viscoelastic material functions of complex fluids relate stress and strain when these assume sufficiently small values and are used to simulate fluid flow using more sophisticated constitutive equations in ...
  • Finlayson, Christopher Edward; Goddard, Chris; Papachristodoulou, Elpida; Snoswell, David R. E.; Kontogeorgos, Andreas; Spahn, Peter; Hellmann, G. Peter; Hess, Ortwin; Baumberg, Jeremy J. (2011)
    We demonstrate the production of high-quality polymer opal fibers in an industrially-scalable process. These fibers exhibit structural color, based on the self-assembly of sub-micron core-shell particles, with a spectrum ...
  • Wood, Ian; Geissert, Matthias; Heck, Horst; Hieber, Matthias (2005-12)
    Let Ω be an exterior domain in It is shown that Ornstein-Uhlenbeck operators L generate C0-semigroups on Lp(Ω) for p ∈ (1, ∞) provided ∂Ω is smooth. The method presented also allows to determine the domain D(L) of L and ...
  • Geissert, Matthias; Heck, Horst; Hieber, Matthias; Wood, Ian (Birkhäuser Basel, 2005)
    Let Ω be an exterior domain in It is shown that Ornstein-Uhlenbeck operators L generate C0-semigroups on Lp(Ω) for p ∈ (1, ∞) provided ∂Ω is smooth. The method presented also allows to determine the domain D(L) of L and ...
  • Brown, Daniel; Schrijver, Carolus (2000-06-27)
    The magnetic field in the outer solar atmosphere is frequently distorted by flares. In some cases, a fraction of the field exhibits a rapidly damped oscillation (Schrijver et al.; Aschwanden et al.). If this is a resonating ...
  • Walters, K.; Binding, David M.; Bell, D. (2006-10)
    In this paper, we give detailed attention to a relatively recent method for the determination of the linear dynamic properties of viscoelastic systems, namely, the so-called oscillatory squeeze flow (OSF) technique. We ...
  • McDonough, Thomas; Key, Jennifer D.; Mavron, Vassili (2008-03)
    Explicit PD-sets are found for partial permutation decoding of the generalized Reed-Muller codes from the affine geometry designs of points and lines in dimension 3 over the prime field of order p, using the information ...
  • Mishuris, Gennady; Movchan, Natasha; Movchan, Alexander; Piccolroaz, Andrea (2012-01-14)
    The paper addresses the problem of a Mode III interfacial crack advancing quasi-statically in a heterogeneous composite material, that is a two-phase material containing elastic inclusions, both soft and stiff, and defects, ...
  • Piccolroaz, Andrea; Movchan, Alexander; Mishuris, Gennady (2011-09-06)
    We consider the perturbation problem of a Mode III interfacial crack. The perturbation is of geometrical type and can be both perturbation of the crack faces and perturbation of the interface, which can deviate from the ...
  • Mishuris, Gennady; Mishakin, V.; Linkov, A. M.; Alford, N.; Fradkin, L.; Dobroskok, A. (2009)
    Real-time control of the direction of a propagating crack is little explored area of management of structural integrity. We have examined it with experiments on quasi-static (slow) cracks in PMMA (Polymethyl-Methacrylate). ...
  • Finlayson, C. E.; Whitney, A. D. (2010-03-10)
    We report a photophysical study of photovoltaic blends containing perylene-substituted polyisocyanide (pery-PIC) materials, using time-correlated single photon counting and photo-induced absorption spectroscopy, and compare ...
  • Mughal, Adil; Chan, H. K.; Weaire, D. (2011-03-16)
    We develop a simple analytical theory that relates dense sphere packings in a cylinder to corresponding disk packings on its surface. It applies for ratios R = D/d (where d and D are the diameters of the hard spheres and ...
  • Winningham, D.; Grande, Manuel; Lundin, R.; Barabash, S. (2006)
    Auroras are caused by accelerated charged particles precipitating along magnetic field lines into a planetary atmosphere, the auroral brightness being roughly proportional to the precipitating particle energy flux. The ...

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