Sort by: Order: Results:

Now showing items 1-20 of 31

  • 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 ...
  • The continuum theory of shear localization in two-dimensional foam 

    HUTZLER, STEFAN; WEAIRE, DENIS LAWRENCE (2010)
    We review some recent advances in the rheology of two-dimensional liquid foams, which should have implications for three-dimensional foams, as well as other mechanical systems that have a yield stress. We focus primarily ...
  • 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 ...
  • Dense packings of spheres in cylinders: Simulations 

    MUGHAL, ADIL; CHAN, HO-KEI; WEAIRE, DENIS LAWRENCE; HUTZLER, STEFAN (American Physical Society, 2012-05-11)
    We study the optimal packing of hard spheres in an infinitely long cylinder, using simulated annealing, and compare our results with the analogous problem of packing disks on the unrolled surface of a cylinder. The densest ...
  • An experimental realisation of the Weaire-Phelan structure in monodisperse liquid foam 

    WEAIRE, DENIS LAWRENCE; HUTZLER, STEFAN (2012)
    The Weaire-Phelan (WP) structure is the lowest energy structure known of an ideal monodisperse foam in the dry limit. To date, it has not been realized in the laboratory. Instead Lord Kelvin's 1887 structure, which it ...
  • Foam as a complex system 

    HUTZLER, STEFAN; WEAIRE, DENIS LAWRENCE (Institute of Physics, 2009)
    What is a `complex system?? The two-dimensional foam, as originally popularized by Cyril Stanley Smith, provides an ideal context in which to explore this question.
  • Instabilities in liquid foams 

    WEAIRE, DENIS LAWRENCE (Royal Society of Chemistry, 2007)
    Instabilities play a central role in the physics of foams. Some that change the topology of a dry foam are indicated by the laws promulgated by Plateau in his 1873 book. Their occurrence is less clearly predictable in ...
  • 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 ...
  • The mechanics of liquid foams: history and new developments 

    HUTZLER, STEFAN; WEAIRE, DENIS LAWRENCE (2011)
    The story of some recent developments in foam rheology is related at key points to the remarkable early contributions of Henry Princen, who pioneered the rigorous modern development of the subject. His general approach of ...
  • 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 ...
  • Phyllotactic Description of Hard Sphere Packing in Cylindrical Channels 

    WEAIRE, DENIS LAWRENCE; CHAN, HO-KEI (2011)
    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 the ...
  • 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 ...
  • Rearrangement and elimination of ordered surface layers of crystalline bubble structures due to gas diffusion 

    HUTZLER, STEFAN; WEAIRE, DENIS LAWRENCE (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 ...