Now showing items 21-40 of 222

  • 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 ...
  • 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}|, ...
  • 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 ...
  • 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 ...
  • Codimension formulae for the intersection of fractal subsets of Cantor spaces 

    Donoven, Casey; Falconer, Kenneth John (2016-02) - Journal article
    We examine the dimensions of the intersection of a subset E of an m-ary Cantor space Cm with the image of a subset F under a random isometry with respect to a natural metric. We obtain almost sure upper bounds for the ...
  • Comparing pre- and post-construction distributions of long-tailed ducks Clangula hyemalis in and around the Nysted offshore wind farm, Denmark : a quasi-designed experiment accounting for imperfect detection, local surface features and autocorrelation 

    Petersen, Ib Krag; MacKenzie, Monique Lea; Rexstad, Eric; Wisz, Mary S.; Fox, Anthony D. (University of St Andrews, 2011) - Report
    We report a novel technique to model abundance patterns of wintering seaducks in relation to the construction of an offshore wind farm (OWF) based on seven years of aerial survey transect data. Distance sampling was used ...
  • Comparison of aerial survey methods for estimating abundance of common scoters 

    Rexstad, Eric; Buckland, Stephen T. (CREEM, University of St Andrews, 2009) - Report
    During the month of March, four survey methods were applied to the SPA at Camarthen Bay. WWT staff carried out visual aerial surveys using distance sampling methodology (Camphuysen et al. 2004). Visual shore-based counts ...
  • Complex Region Spatial Smoother (CReSS) 

    Scott Hayward, Lindesay Alexandra Sarah; MacKenzie, Monique Lea; Donovan, Carl Robert; Walker, Cameron; Ashe, Erin (University of St Andrews, 2011) - Report
    Conventional smoothing over complicated coastal and island regions may result in errors across boundaries, due to the use of Euclidean distances to represent inter-point similarity. The new Complex Region Spatial Smoother ...
  • conting : an R package for Bayesian analysis of complete and incomplete contingency tables 

    Overstall, Antony; King, Ruth (2014-06) - Journal article
    The aim of this paper is to demonstrate the R package conting for the Bayesian analysis of complete and incomplete contingency tables using hierarchical log-linear models. This package allows a user to identify interactions ...
  • Convectively induced shear instability in large amplitude internal solitary waves 

    Carr, Magda; Fructus, D; Grue, J; Jensen, A; Davies, P A (2008-12) - Journal article
    Laboratory study has been carried out to investigate the instability of an internal solitary wave of depression in a shallow stratified fluid system. The experimental campaign has been supported by theoretical computations ...
  • Coprime invariable generation and minimal-exponent groups 

    Detomi, Eloisa; Lucchini, Andrea; Roney-Dougal, C.M. (2015-08) - Journal article
    A finite group G is coprimely invariably generated if there exists a set of generators {g1,. .,gu} of G with the property that the orders |g1|,. .,|gu| are pairwise coprime and that for all x1,. .,xu∈G the set {g1x1,. ...
  • Copulae on products of compact Riemannian manifolds 

    Jupp, P.E. (2015-09) - Journal article
    Abstract One standard way of considering a probability distribution on the unit n -cube, [0 , 1]n , due to Sklar (1959), is to decompose it into its marginal distributions and a copula, i.e. a probability distribution on ...
  • The critical merger distance between two co-rotating quasi-geostrophic vortices 

    Reinaud, Jean Noel; Dritschel, David Gerard (2005-01-10) - Journal article
    This paper examines the critical merger or strong interaction distance between two equal-potential-vorticity quasi-geostrophic vortices. The interaction between the two vortices depends on five parameters: their volume ...
  • A critical review of the literature on population modelling 

    Cabrelli, Abigail; Harwood, John; Matthiopoulos, Jason; New, Leslie Frances; Thomas, Len (University of St Andrews, 2009) - Report
    The 2005 report of the National Research Council’s ‘Committee on Characterizing Biologically Significant Marine Mammal Behavior’ proposed a framework, which they called PCAD - Population Consequences of Acoustic Disturbance, ...
  • Decomposition tables for experiments : I. A chain of randomizations 

    Brien, C. J.; Bailey, Rosemary Anne (2009-12) - Journal article
    One aspect of evaluating the design for an experiment is the discovery of the relationships between subspaces of the data space. Initially we establish the notation and methods for evaluating an experiment with a single ...
  • Decomposition tables for experiments : II. Two–one randomizations 

    Brien, C. J.; Bailey, Rosemary Anne (2010-10) - Journal article
    We investigate structure for pairs of randomizations that do not follow each other in a chain. These are unrandomized-inclusive, independent, coincident or double randomizations. This involves taking several structures ...
  • A default prior distribution for contingency tables with dependent factor levels 

    Overstall, Antony; King, Ruth (2014-01) - Journal article
    A default prior distribution is proposed for the Bayesian analysis of contingency tables. The prior is specified to allow for dependence between levels of the factors. Different dependence structures are considered, including ...