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Now showing items 1-20 of 22

  • Computer generation of structural models of amorphous Si and Ge 

    WEAIRE, DENIS LAWRENCE (1985)
    We have developed and applied a computer algorithm that generates realistic random-network models of a-Si with periodic boundary conditions. These are the first models to have correlation functions that show no serious ...
  • Convective instability in foam drainage 

    WEAIRE, DENIS LAWRENCE; HUTZLER, STEFAN (EDP Sciences, 1998)
    The use of a column of steadily drained foam as a sample of wet foam is limited by flow instability as the liquid fraction is increased. We report a study of this instability, which takes the form of a convective roll ...
  • The Crystal Structure of Bubbles in the Wet Foam Limit (Amendment) 

    WEAIRE, DENIS LAWRENCE; HUTZLER, STEFAN (Royal Society of Chemistry, 2006)
    We have observed a rich variety of three-dimensional crystal and defect structures spontaneously formed by small (diameter 200 mm) bubbles in a wet foam. The observations confirm and extend those made by Bragg and Nye ...
  • Measurement of Foam Density Profiles Using AC Capacitance 

    WEAIRE, DENIS LAWRENCE; HUTZLER, STEFAN (EDP Sciences, 1995)
    The dynamics of foam drainage (free, forced and pulsed) is monitored by the determination of local liquid density using a vertical array of capacitors. Liquid profiles are obtained for various drainage experiments. The ...
  • Numerical study of conductivity for the Anderson model in two and three dimensions 

    WEAIRE, DENIS LAWRENCE (1981)
    The equation-of-motion method is applied to the calculation of the conductivity for the Anderson model in two and three dimensions. The Kubo-Greenwood formula is evaluated by averaging suitable combinations of time-dependent ...
  • Observations of a variety of drainage patterns in bamboo foams 

    WEAIRE, DENIS LAWRENCE; HUTZLER, STEFAN (EDP Sciences, 2008)
    We have explored the patterns of drainage in a bamboo foam, i.e. a foam consisting of an arrangement of parallel soap films with equidistant spacing. We find an intriguing variety of such patterns, both static and dynamic. ...
  • On the Road Again: Metal Foams Find Favor 

    WEAIRE, DENIS LAWRENCE (American Institute of Physics, 2002)
    The three states of matter are well represented by earth, sea, and sky. God saw that it was good, and so did many generations of physics lecturers. But purity is obscurity, as Ogden Nash reminded us. The rich variety of ...
  • Onset of rigidity for stretched string networks 

    HUTZLER, STEFAN; WEAIRE, DENIS LAWRENCE (Institute of Physics, 2005)
    We define and analyse an elementary model for a network of strings with random natural lengths. As this system is expanded, a threshold is reached where some of the strings form a taut string network. Further expansion ...
  • Optimising Transport in a Homogeneous Network 

    WEAIRE, DENIS LAWRENCE (American Physical Society, 2004)
    Many situations in physics, biology, and engineering consist of the transport of some physical quantity through a network of narrow channels. The ability of a network to transport such a quantity in every direction can ...
  • Optimizing transport in a homogeneous network 

    WEAIRE, DENIS LAWRENCE (American Physical Society, 2004)
    Many situations in physics, biology, and engineering consist of the transport of some physical quantity through a network of narrow channels. The ability of a network to transport such a quantity in every direction can ...
  • Pre-empting Plateau: The nature of topological transitions in foam 

    HUTZLER, STEFAN; WEAIRE, DENIS LAWRENCE (Institute of Physics, 2007)
    When the area of a face in a dry foam approaches zero in some quasistatic processes, Plateau?s rules dictate that there must be an instability. This is more subtle than generally supposed.We argue that it is generally ...
  • Rearrangement and elimination of ordered surface layers of crystalline bubble structures due to gas diffusion 

    WEAIRE, DENIS LAWRENCE; HUTZLER, STEFAN (Royal Society of Chemistry, 2009)
    We describe a hitherto unknown self-organising effect in wet crystalline bubble structures exposed to air. Due to the escape of gas from the bubbles in the top surface layer, bubbles shrink and create space for the bubbles ...
  • Steady-State Drainage of an Aqueous Foam 

    WEAIRE, DENIS LAWRENCE; HUTZLER, STEFAN (American Physical Society, 1993)
    The process of wetting of a monodisperse foam by the continuous addition of liquid from the top has been investigated for a cylindrical column. The velocity of the interface between dry and wet foam was found to vary as ...
  • Theory of diffusivelight scattering from disordered materials 

    WEAIRE, DENIS LAWRENCE; LUNNEY, JAMES GERARD; HUTZLER, STEFAN (International Society for Optical Engineering, 1994)
    It is suggested that the measurement of the angular distribution of light transmitted through a thick slab of diffusively scattering material may provide information about the nature of the local scattering events. Monte ...
  • Time for a rethink of research proposal evaluation? 

    WEAIRE, DENIS LAWRENCE (2007)
    The processes of research proposals and evaluation have become ever more elaborate, but the system remains primitive. This paper argues for a fresh look at existing practices, with a view to developing less onerous and ...
  • Torque in nested Halbach cylinders 

    WEAIRE, DENIS LAWRENCE; COEY, JOHN MICHAEL DAVID (IEEE, 1999)
    Permanent magnet variable flux sources are produced by rotating two nested N-segment, permanent magnet, Halbach cylinders. Torque is primarily an end effect, determined by field non-uniformities due to the fmite length ...
  • Torque in nested Halbach cylinders 

    Ni Mhiochain, T.R; WEAIRE, DENIS LAWRENCE; MCMURRY, SARA; COEY, JOHN MICHAEL DAVID (IEEE, 1999)
  • Torque in nested Halbach cylinders 

    Ni Mhiochain, T.R.; WEAIRE, DENIS LAWRENCE; MCMURRY, SARA; COEY, JOHN MICHAEL DAVID (IEEE, 1999)
  • Toying with physics 

    HUTZLER, STEFAN; WEAIRE, DENIS LAWRENCE (European Physical Society, 2007)
    In the early 19th century the popularisation of science became a vogue, expressed in books that often took the form of ?conversations on natural philosophy?. They may have echoed the discourse of the classical dialogue ...
  • Two-dimensional foam rheology with viscous drag 

    WEAIRE, DENIS LAWRENCE; HUTZLER, STEFAN (American Physical Society, 2006)
    We formulate and apply a continuum model that incorporates elasticity, yield stress, plasticity, and viscous drag. It is motivated by the two-dimensional foam rheology experiments of Debregeas et al. [Phys. Rev. Lett. ...