Now showing items 19-38 of 307

  • 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 ...
  • 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}|, ...
  • Blockage of saline intrusions in restricted, two-layer exchange flows across a submerged sill obstruction 

    Cuthbertson, Alan; Laanearu, Janek; Carr, Magda; Sommeria, Joel; Viboud, Samuel (2017-03-23) - Journal article
    Results are presented from a series of large-scale experiments investigating the internal and near-bed dynamics of bi-directional stratified flows with a net-barotropic component across a submerged, trapezoidal, sill ...
  • Cancellative and Malcev presentations for finite Rees index subsemigroups and extensions 

    Cain, Alan James; Robertson, Edmund Frederick; Ruskuc, Nik (2008-02) - Journal article
    It is known that, for semigroups, the property of admitting a finite presentation is preserved on passing to subsemigroups and extensions of finite Rees index. The present paper shows that the same holds true for Malcev, ...
  • Capture-recapture abundance estimation using a semi-complete data likelihood approach 

    King, Ruth; T. McClintock, Brett; Kidney, Darren; Borchers, David (2016-03) - Journal article
    Capture-recapture data are often collected when abundance estimation is of interest. In the presence of unobserved individual heterogeneity, specified on a continuous scale for the capture probabilities, the likelihood is ...
  • A changepoint analysis of spatio-temporal point processes 

    Altieri, Linda; Scott, E. Marian; Cocchi, Daniela; Illian, Janine B. (2015) - Journal article
    This work introduces a Bayesian approach to detecting multiple unknown changepoints over time in the inhomogeneous intensity of a spatio-temporal point process with spatial and temporal dependence within segments. We propose ...
  • Chronic exposure to imidacloprid increases neuronal vulnerability to mitochondrial dysfunction in the bumblebee (Bombus terrestris) 

    Moffat, C.; Goncalves Pacheco, J.; Sharpe, S.; Samson, A.J.; Bollan, K.A.; Huang, J.; Buckland, Stephen Terrence; Connolly, C.N. (2015-05) - Journal article
    The global decline in the abundance and diversity of insect pollinators could result from habitat loss, disease, and pesticide exposure. The contribution of the neonicotinoid insecticides (e.g., clothianidin and imidacloprid) ...
  • Circular designs balanced for neighbours at distances one and two 

    Aldred, R. E. L.; Bailey, R. A.; Mckay, Brendan D.; Wanless, Ian M. (2014-12) - Journal article
    We define three types of neighbour-balanced designs for experiments where the units are arranged in a circle or single line in space or time. The designs are balanced with respect to neighbours at distance one and at ...
  • Circular designs balanced for neighbours at distances one and two 

    Aldred, R. E. L.; Bailey, R. A.; Mckay, Brendan D.; Wanless, Ian M. (2014-12) - Journal article
    We define three types of neighbour-balanced designs for experiments where the units are arranged in a circle or single line in space or time. The designs are balanced with respect to neighbours at distance one and at ...