Now showing items 16-35 of 359

  • Automatic generation of generalised regular factorial designs 

    Kobilinsky, André; Monod, Hervé; Bailey, R. A. (2017-09) - Journal article
    The R package planor enables the user to search for, and construct, factorial designs satisfying given conditions. The user specifies the factors and their numbers of levels, the factorial terms which are assumed to be ...
  • Automatic presentations and semigroup constructions 

    Cain, Alan J.; Oliver, Graham; Ruskuc, Nik; Thomas, Richard M. (2010-08) - Journal article
    An automatic presentation for a relational structure is, informally, an abstract representation of the elements of that structure by means of a regular language such that the relations can all be recognized by finite ...
  • Automatic presentations for semigroups 

    Cain, Alan James; Oliver, Graham; Ruskuc, Nik; Thomas, Richard M. (2009-11) - Journal article
    This paper applies the concept of FA-presentable structures to semigroups. We give a complete classification of the finitely generated FA-presentable cancellative semigroups: namely, a finitely generated cancellative ...
  • Automorphism groups of countable algebraically closed graphs and endomorphisms of the random graph 

    Dolinka, Igor; Gray, Robert Duncan; McPhee, Jillian Dawn; Mitchell, James David; Quick, Martyn (2016-05) - Journal article
    We establish links between countable algebraically closed graphs and the endomorphisms of the countable universal graph R. As a consequence we show that, for any countable graph Γ, there are uncountably many maximal subgroups ...
  • Average distances on self-similar sets and higher order average distances of self-similar measures 

    Allen, D.; Edwards, H.; Harper, S.; Olsen, Lars Ole Ronnow (2016-12-29) - Journal article
    The purpose of this paper is twofold: (1) We study different notions of the average distance between two points of a self-similar subset of ℝ, and (2) we investigate the asymptotic behaviour of higher order average moments ...
  • Backward wave cyclotron-maser emission in the auroral magnetosphere 

    Speirs, D. C.; Bingham, R.; Cairns, R. A.; Vorgul, I.; Kellett, B. J.; Phelps, A. D. R.; Ronald, K. (2014-10-07) - Journal article
    In this Letter, we present theory and particle-in-cell simulations describing cyclotron radio emission from Earth's auroral region and similar phenomena in other astrophysical environments. In particular, we find that the ...
  • A balanced approach to modelling rotating stably stratified geophysical flows 

    Dritschel, David Gerard; Viúdez, Alvaro (2003-08-10) - Journal article
    We describe a new approach to modelling three-dimensional rotating stratified flows under the Boussinesq approximation. This approach is based on the explicit conservation of potential vorticity, and exploits the underlying ...
  • Balanced solutions for an ellipsoidal vortex in a rotating stratified flow 

    Mckiver, William J.; Dritschel, David G. (2016-09) - Journal article
    We consider the motion of a single ellipsoidal vortex with uniform potential vorticity in a rotating stratified fluid at finite Rossby number . Building on previous solutions obtained under the quasi-geostrophic approximation ...
  • A Bayesian approach to fitting Gibbs processes with temporal random effects 

    King, Ruth; Illian, Janine Baerbel; King, Stuart Edward; Nightingale, Glenna Faith; Hendrichsen, Ditte (2012-12) - Journal article
    We consider spatial point pattern data that have been observed repeatedly over a period of time in an inhomogeneous environment. Each spatial point pattern can be regarded as a “snapshot” of the underlying point process ...
  • Bayesian bin distribution inference and mutual information 

    Endres, Dominik Maria; Foldiak, Peter (2005-11) - Journal article
    We present an exact Bayesian treatment of a simple, yet sufficiently general probability distribution model. We consider piecewise-constant distributions' P(X) with uniform (second-order) prior over location of discontinuity ...
  • Bayesian hierarchical modelling of continuous non-negative longitudinal data with a spike at zero : an application to a study of birds visiting gardens in winter 

    Swallow, Benjamin Thomas; Buckland, Stephen Terrence; King, Ruth; Toms, Mike (2016-03) - Journal article
    The development of methods for dealing with continuous data with a spike at zero has lagged behind those for overdispersed or zero-inflated count data. We consider longitudinal ecological data corresponding to an annual ...
  • Bayesian methods for hierarchical distance sampling models 

    Oedekoven, Cornelia Sabrina; Buckland, Stephen Terrence; MacKenzie, Monique Lea; King, Ruth; Evans, Kristine; Burger, Wes (2014-06-01) - Journal article
    The few distance sampling studies that use Bayesian methods typically consider only line transect sampling with a half-normal detection function. We present a Bayesian approach to analyse distance sampling data applicable ...
  • Bayesian P-splines and advanced computing in R for a changepoint analysis on spatio-temporal point processes 

    Altieri, L.; Cocchi, D.; Greco, F.; Illian, J. B.; Scott, E. M. (2016) - Journal article
    This work presents advanced computational aspects of a new method for changepoint detection on spatio-temporal point process data. We summarize the methodology, based on building a Bayesian hierarchical model for the data ...
  • Bayesian sequential tests of the initial size of a linear pure death process 

    Goudie, I.B.J. (2015-05) - Journal article
    We provide a recursive algorithm for determining the sampling plans of invariant Bayesian sequential tests of the initial size of a linear pure death process of unknown rate. These tests compare favourably with the ...
  • Behind and beyond a theorem on groups related to trivalent graphs 

    Havas, George; Robertson, Edmund F.; Sutherland, Dale C. (2008-12) - Journal article
    In 2006 we completed the proof of a five-part conjecture that was made in 1977 about a family of groups related to trivalent graphs. This family covers all 2-generator, 2-relator groups where one relator specifies that a ...
  • Bending and twisting instabilities of columnar elliptical vortices in a rotating strongly stratified fluid 

    Billant, Paul; Dritschel, David Gerard; Chomaz, Jean-Marc (2006-08-25) - Journal article
    In this paper, we investigate the three-dimensional stability of the Moore-Saffman elliptical vortex in a rotating stratified fluid. By means of an asymptotic analysis for long vertical wavelength perturbations and small ...
  • The Bergman property for semigroups 

    Maltcev, V.; Mitchell, J. D.; Ruskuc, N. (2009-08) - Journal article
    In this article, we study the Bergman property for semigroups and the associated notions of cofinality and strong cofinality. A large part of the paper is devoted to determining when the Bergman property, and the values ...
  • Bernoulli convolutions and 1D dynamics 

    Kempton, Thomas Michael William; Persson, Tomas (2015-10-08) - Journal article
    We describe a family φλ of dynamical systems on the unit interval which preserve Bernoulli convolutions. We show that if there are parameter ranges for which these systems are piecewise convex, then the corresponding ...
  • Between primitive and 2-transitive : synchronization and its friends 

    Araújo, João; Cameron, Peter Jephson; Steinberg, Benjamin (2017-06-15) - Journal article
    An automaton (consisting of a finite set of states with given transitions) is said to be synchronizing if there is a word in the transitions which sends all states of the automaton to a single state. Research on this topic ...
  • Beyond sum-free sets in the natural numbers 

    Huczynska, Sophie (2014-02-07) - Journal article
    For an interval [1,N]⊆N, sets S⊆[1,N] with the property that |{(x,y)∈S2:x+y∈S}|=0, known as sum-free sets, have attracted considerable attention. In this paper, we generalize this notion by considering r(S)=|{(x,y)∈S2:x+y∈S}|, ...