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Browsing Mathemateg a Ffiseg / Mathematics & Physics by Title

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  • Exploring Low-energy Fully-coordinated (SiO2)N Nano-clusters with Graph-based sampling 
    Flikkema, E.; Bromley, S. T. (2009-06-30)
  • Extremely long baseline interplanetary scintillation measurements of solar wind velocity 
    Breen, A. R.; Fallows, R. A.; Bisi, M. M.; Thomasson, P.; Jordan, C. A.; Wannberg, G.; Jones, R. A. (2006-08-01)
    We present results of observations of interplanetary scintillation (IPS) made using the telescopes of the MERLIN and EISCAT networks in which the beam separation approached 2000 km, much larger than in any previous IPS ...
  • Feasibility of in situ neutron diffraction studies of non-crystalline silicates up to pressures of 25 GPa 
    Wilding, Martin C.; Guthrie, Malcolm; Bull, Craig L.; Tucker, Matt G.; McMillan, Paul F. (2008-08-18)
    There is an increasing interest in the structural modifications found in liquids and amorphous systems as a function of pressure. Neutron diffraction is a key technique for determining these structures, but its application ...
  • Finite element verification of transmission conditions for 2D heat conduction problems 
    Oechsner, A.; Miszuris, Wiktoria; Mishuris, Gennady (2007)
    Imperfect transmission conditions modelling a thin 2D intermediate layer between two bonded materials in a dissimilar strip have been derived and analytically analysed in another paper of this issue. In this paper, the ...
  • Flow of viscoplastic materials through converging channels 
    Lyamina, E.; Mishuris, Gennady; Alexandrov, S. (2008-12)
    Many classical rigid perfectly/plastic solutions cannot be extended to more complicated rigid plastic materials, such as rigid plastic hardening materials and rigid viscoplastic materials. The present paper reveals sources ...
  • Formation of channels for fast-ion diffusion in alkali silicate melts: A quasielastic neutron scattering study 
    Kargl, Florian; Schober, H.; Meyer, A.; Koza, M. M. (2006-07)
    The mechanism of alkali ion diffusion in sodium, lithium, and potassium disilicate melts is studied by means of quasielastic neutron scattering. Although scattering on alkali atoms comprises coherent and incoherent ...
  • Frictionless elliptical contact of thin viscoelastic layers bonded to rigid substrates 
    Mishuris, Gennady; Argatov, Ivan (2011-09-06)
    A three-dimensional unilateral contact problem for thin viscoelastic layers bonded to rigid substrates shaped like elliptic paraboloids is considered. Two cases are studied: (a) Poisson's ratios of the layer materials are ...
  • A fully integrated multi-channel detector for electron spectroscopy 
    Chase, Thomas Robert; Evans, D. A.; Langstaff, David; Bushell, A. (2005-08)
    In electron spectroscopy, multi-channel detection combined with intense radiation sources provides the optimum experimental configuration. Building on the 5 mm, 192-channel ion detector developed at Aberystwyth, longer ...
  • A fully integrated multi-channel detector for electron spectroscopy 
    Langstaff, David; Bushell, A.; Chase, Thomas Robert; Evans, Andrew (Elsevier, 2005-08)
    In electron spectroscopy, multi-channel detection combined with intense radiation sources provides the optimum experimental configuration. Building on the 5 mm, 192-channel ion detector developed at Aberystwyth, longer ...
  • Generalized semi-geostrophic theory on a sphere 
    Cullen, M. J. P.; Douglas, Robert J.; Roulston, I.; Sewell, M. J. (2005)
    It is shown that the solution of the semi-geostrophic equations for shallow-water flow can be found and analysed in spherical geometry by methods similar to those used in the existing $f$-plane solutions. Stable states in ...
  • The Geometry of Frequency Squares 
    Mavron, Vassili C.; Jungnickel, D.; McDonough, Thomas P. (2001-11)
    This paper establishes a correspondence between mutually orthogonal frequency squares (MOFS) and nets satisfying an extra property (“framed nets”). In particular, we provide a new proof for the bound on the maximal size ...
  • The geometry of sets of orthogonal frequency hypercubes 
    Mullen, Gary L.; McDonough, Thomas P.; Mavron, V. C. (2006-11)
    We extend the notion of a framed net, introduced by D. Jungnickel, V. C. Mavron, and T. P. McDonough, J Combinatorial Theory A, 96 (2001), 376–387, to that of a d-framed net of type ℓ, where d ≥ 2 and 1 ≤ ℓ ≤ d-1, and we ...
  • Global Optimization of (hydroxylated) Silica Clusters 
    Flikkema, Edwin; Bromley, Stefan (2011-06-30)
  • Global oscillations in a magnetic solar model : II Oblique propagation 
    Pintér, Balázs; Erdélyi, R.; Goossens, M. (2007-04)
    The coupling of solar global acoustic oscillations to a magnetised solar atmosphere is studied here. The solar interior - atmosphere interface is modelled by a non-magnetic polytrope interior overlayed by a planar atmosphere ...
  • Graph-based global optimisation of fully-coordinated silica clusters 
    Flikkema, E. (2009-07-05)
    We present a detailed global optimization study of cluster geometries with silica nano-clusters (SiO2)N as a specific example. In an earlier study (Phys. Rev. Lett., 95: 185505, 2005) we used the Basin Hopping methodology ...
  • Graph-based global optimization of fully-coordinated cluster geometries 
    Flikkema, E.; Bromley, S. T. (2009-03-17)
    We present a detailed global optimization study of cluster geometries with silica nano-clusters (SiO$_2$)$_N$ as a specific example. In an earlier study (Phys. Rev. Lett., 95: 185505, 2005) we used the Basin Hopping ...
  • Graph-based sampling of fully-coordinated silica (SiO2)N clusters 
    Flikkema, E.; Bromley, S. T. (2008-09-16)
    Silica (SiO2) is a versatile material with many different bulk polymorphs. Whereas bulk silica has been studied extensively, much less is known about silica clusters. The authors have studied silica clusters before, using ...
  • Hamilton–Jacobi–Bellman equations for quantum optimal feedback control 
    Gough, John E.; Belavkin, V. P.; Smolianov, O. G. (2005)
    We exploit the separation of the filtering and control aspects of quantum feedback control to consider the optimal control as a classical stochastic problem on the space of quantum states. We derive the corresponding ...
  • "Helter-Skelter-Like" Perylene Polyisocyanopeptides 
    Schwartz, Erik; Palermo, Vincenzo; Finlayson, Chris E.; Huang, Ya-Shih; Otten, Matthijs B. L.; Liscio, Andrea; Trapani, Sara; Gonzalez-Valls, Irene; Brocorens, Patrick; Cornelissen, Jeroen J. L. M.; Peneva, Kalina; Muellen, Klaus; Spano, Frank C.; Yartsev, Arkady; Westenhoff, Sebastian; Friend, Richard H.; Beljonne, David; Nolte, Roeland J. M.; Samori, Paolo; Rowan, Alan E.; Finlayson, Christopher Edward (2009-03-02)
    We report on a combined experimental and computational investigation on the synthesis and thorough characterization of the structure of perylene-functionalized polyisocyanides. Spectroscopic analyses and extensive molecular ...
  • High-Energy X-ray Diffraction from Aluminosilicate Liquids 
    Wilding, M. C.; Benmore, C. J.; Weber, J. K. R. (2010-05-06)
    Containerless high energy X-ray diffraction measurements have been performed on molten Al2O3-SiO2 as a function of composition. The data show a strong distortion of the SiO4 tetrahedral units and a breakdown of intermediate ...

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