Browsing by Author "Hutzler, Stefan"
Now showing items 1-20 of 28
-
2D foams above the jamming transition: Deformation matters
Hutzler, Stefan; Weaire, Denis; Moebius, Matthias (2017)Jammed soft matter systems are often modelled as dense packings of overlapping soft spheres, thus ignoring particle deformation. For 2D (and 3D) soft disks packings, close to the critical packing fraction ϕc, this results ... -
Analysis of the foam-forming of non-woven lightweight fibrous materials using X-ray tomography
Hutzler, Stefan; Moebius, Matthias (2021)Foam-forming has in the past predominantly been used to create two-dimensional sheet-like fibrous materials. Allowing the foam to drain freely and decay under gravity, rather than applying a vacuum to remove it rapidly, ... -
Buckling of a linear chain of hard spheres in a harmonic confining potential: Numerical and analytical results for low and high compression
Hutzler, Stefan; Weaire, Denis; Mughal, Adil; Irannezhad, Ali; Ryan-Purcell, John (2020)We extend a previous analysis of the buckling properties of a linear chain of hard spheres between hard walls under transverse harmonic confinement. Two regimes are distinguished—low compression, for which the entire chain ... -
Buckling of a tilted line of confined hard spheres
Hutzler, Stefan; Weaire, Denis (2022)A linear chain of hard spheres confined in a transverse harmonic potential is unstable and buckles, if tilted beyond some critical angle. We examine this symmetry breaking using a computational model that was previously ... -
Can soap films be used as models for mortality studies?
Hutzler, Stefan; Richmond, Peter (2018)We report studies of the life expectancy of sets of parallel liquid films made from surfactant solution and contained in cylindrical perspex tubes. The tubes are sealed at the bottom and vertically placed. From our analysis ... -
Columnar structures of soft spheres: Metastability and hysteresis
Hutzler, Stefan; Weaire, Denis (2018) -
A continuum description of the buckling of a line of spheres in a transverse harmonic confining potential
Hutzler, Stefan; Weaire, Denis (2023)A line of contacting hard spheres, placed in a transverse confining potential, buckles under compression or when tilted away from the horizontal, once a critical tilt angle is exceeded. This interesting nonlinear problem ... -
Coulomb Calligraphy
Hutzler, Stefan (2023)The equilibrium configurations of N Coulomb charges confined by a harmonic potential in two dimensions are found to exhibit a wide variety of patterns that are pleasing to the eye, when adjacent points are joined up. We ... -
The Crystal Structure of Bubbles in the Wet Foam Limit
Hutzler, Stefan; Weaire, Denis (2006)We have observed a rich variety of three-dimensional crystal and defect structures spontaneously formed by small (diameter 200 µm) bubbles in a wet foam. The observations confirm and extend those made by Bragg and Nye in ... -
Demonstration and interpretation of "scutoid" cells formed in a quasi-2D soap froth
Hutzler, Stefan; Weaire, Denis; Mughal, A.; Cox, S.J.; Burke, S.R. (2018)Recently a novel type of epithelial cell has been discovered and dubbed the ‘scutoid’. It is induced by curvature of the bounding surfaces. We show by simulations and experiments that such cells are to be found in a dry ... -
Description of the buckling of a chain of hard spheres in terms of Jacobi functions
Hutzler, Stefan; Weaire, Denis (2022)A linear chain of hard spheres, confined by a transverse harmonic potential, buckles under compression between two hard walls. Jacobi functions provide exact analytic solutions of a differential equation (related to the ... -
Distributions of certain market observables in an on-line betting exchange
Hutzler, Stefan; Richmond, Peter (2011)We analyze high frequency time series of odds and trading volume as extracted from markets on an on-line betting exchange, Betfair.com. As in financial markets, the probability distributions for the change in the market ... -
Dynamics of money and income distributions
Hutzler, Stefan; Richmond, Peter (2005)We study the model of interacting agents proposed by Chatterjee et al that allows agents to both save and exchange wealth. Closed equations for the wealth distribution are developed using a mean field approximation. We ... -
The energy of fcc and hcp foams
Hutzler, Stefan; Weaire, Denis (2020)We present Surface Evolver evaluations of the difference in energy between face-centred cubic (fcc) and hexagonal close-packed (hcp) foams in the usual idealized model, for liquid fractions ranging from the dry to the wet ... -
Equilibrium configurations of hard spheres in a cylindrical harmonic potential.
Hutzler, Stefan; Weaire, Denis; Winkelmann, J.; Mughal, A. (2019) -
Equilibrium shape of a bubble in a liquid-filled horizontal capillary
Hutzler, Stefan (2024)Bubbles in liquid-filled capillaries feature in many practical applications. Here we describe the equilibrium shape of a bubble in a horizontal capillary of circular cross section, as computed numerically using energy ... -
Equilibrium states of confined ions in two dimensions
Hutzler, Stefan (2023)Ions that are trapped in two dimensions and are subject to a harmonic confining potential have widely varying stationary states that exhibit various asymptotic forms and bifurcations. We present a ‘birds-eye’ view of these ... -
Implementation of Morse-Witten theory for a polydisperse wet 2D foam simulation
Hutzler, Stefan; Weaire, Denis (Taylor & Francis, 2019-06)The Morse–Witten theory provides a formulation for the inter-bubble forces and corresponding deformations in a liquid foam, accurate in the limit of high liquid fraction. Here we show how the theory may be applied in ... -
Mortality: a physics perspective
Hutzler, Stefan; Richmond, Peter (2021)One of the many interests of the late Dietrich Stauffer was the modelling of mortality. Here we review the features of mortality data for various biological species. Age specific mortality (death rate) leads to a discussion ... -
On the relationship between income, fertility rates and the state of democracy in society
Hutzler, Stefan; Richmond, Peter (2016)Empirical data for 145 countries shows a strong correlation between the gross national income per capita and the political form of their governance, as specified by the so-called democracy index. We interpret this relationship ...