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Browsing Mathemateg a Ffiseg / Mathematics & Physics by Title

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  • 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 ...
  • High pressure effects on liquid viscosity and glass transition behaviour, polyamorphic phase transitions and structural properties of glasses and liquids 
    McMillan, Paul F.; Wilding, Martin C. (2009-05-01)
    Since the pioneering work of Bridgman it has been known that pressure affects the glass transition of polymers and liquid state viscosities. Usually the T-g and viscosity both increase as a function of pressure as expected ...
  • High pressure x-ray diffraction measurements on Mg2SiO4 glass 
    Benmore, C. J.; Soignard, E.; Guthrie, M.; Amin, S. A.; Weber, J. K. R.; McKiernan, K.; Wilding, M. C.; Yarger, J. L. (2011-07-01)
    The structure factors of Mg2SiO4 glass have been measured using high energy x-ray diffraction up to pressures of 30.2 GPa, and the equation of state measured up to 12.8 GPa. The average Mg-O coordination numbers were ...
  • High-pressure x-ray scattering and computer simulation studies of density-induced polyamorphism in silicon 
    Wilson, M.; Wilding, Martin C.; Daisenberger, Dominik; Machon, Denis; Cabrera, Raul Quesada (2007-06-28)
    A low- to high-density pressure-driven phase transition in amorphous silicon is investigated by synchrotron x-ray diffraction in the diamond anvil cell. Complementary atomistic molecular dynamics computer simulations provide ...
  • High temperature calorimetric studies of heat of solution of NiO, CuO, La2O3, TiO2, HfO2 in sodium silicate liquids 
    Linard, Yannick; Wilding, Martin C.; Navrotsky, Alexandra (2008-01-15)
    The enthalpies of solution of La2O3, TiO2, HfO2, NiO and CuO were measured in sodium silicate melts at high temperature. When the heat of fusion was available, we derived the corresponding liquid–liquid enthalpies of mixing. ...
  • Holevo-Ordering and the Continuous-Time Limit for Open Floquet Dynamics 
    Gough, John E. (2004-03)
    We consider an atomic beam reservoir as a source of quantum noise. The atoms are modelled as two-state systems and interact one-at-a-time with the system. The Floquet operators are described in terms of the Fermionic ...
  • Hulls of codes from incidence matrices of connected regular graphs 
    McDonough, T. P.; Ghinelli, D.; Key, J. D. (2012-04-23)
    The hulls of codes from the row span over F_p, for any prime p, of incidence matrices of connected k-regular graphs are examined, and the dimension of the hull is given in terms of the dimension of the row span of A+kI ...
  • Hybrid simulation of ion cyclotron resonance in the solar wind: evolution of velocity distribution functions 
    Li, Xing; Habbal, Shadia Rifai (2005-10)
    Resonant interaction between ions (oxygen ions O+5 and protons) and ion cyclotron waves is investigated using a one dimensional hybrid code. Ion cyclotron waves are self-consistently generated by an ion cyclotron anisotropy ...

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