Now showing items 65-84 of 222

  • Falling towards forgetfulness : synaptic decay prevents spontaneous recovery of memory 

    Stone, James V.; Jupp, Peter Edmund (2008-08-22) - Journal article
    Long after a new language has been learned and forgotten, relearning a few words seems to trigger the recall of other words. This "free-lunch learning'' (FLL) effect has been demonstrated both in humans and in neural network ...
  • A family of spatial biodiversity measures based on graphs 

    Rajala, T; Illian, Janine Baerbel (2012-12) - Journal article
    While much research in ecology has focused on spatially explicit modelling as well as on measures of biodiversity, the concept of spatial (or local) biodiversity has been discussed very little. This paper generalises ...
  • Finite groups are big as semigroups 

    Dolinka, Igor; Ruskuc, Nik (2011-09) - Journal article
    We prove that a finite group G occurs as a maximal proper subsemigroup of an infinite semigroup (in the terminology of Freese, Ježek, and Nation, G is a big semigroup) if and only if |G| ≥ 3. In fact, any finite semigroup ...
  • Fitting complex ecological point process models with integrated nested Laplace approximation 

    Illian, Janine Baerbel; Martino, Sara; Sørbye, Sigrunn H.; Gallego-Fernández, Juan B.; Zunzunegui, Maria; Esquivias, M. Paz; Travis, Justin M. (2013-04) - Journal article
    Summary 1. We highlight an emerging statistical method, integrated nested Laplace approximation (INLA), which is ideally suited for fitting complex models to many of the rich spatial data sets that ecologists wish to ...
  • Formation and large-scale patterns of filament channels and filaments 

    Mackay, Duncan Hendry (Springer International Publishing, 2015) - Book item
    The properties and large-scale patterns of filament channels and filaments are considered. Initially, the global formation locations of filament channels and filaments are discussed, along with their hemispheric pattern. ...
  • The formation and stability of Petschek reconnection 

    Baty, H.; Forbes, T.G.; Priest, E.R. (2014-11) - Journal article
    A combined analytical and numerical study of magnetic reconnection in two-dimensional resistive magnetohydrodynamics is carried out by using different explicit spatial variations of the resistivity. A special emphasis on ...
  • Free products in R. Thompson’s group V 

    Bleak, Collin Patrick; Salazar-Diaz, Olga (2013-11) - Journal article
    We investigate some product structures in R. Thompson's group $ V$, primarily by studying the topological dynamics associated with $ V$'s action on the Cantor set C. We draw attention to the class D(V,C) of groups which ...
  • The functional response of a generalist predator 

    Smout, Sophie Caroline; Asseburg, C; Matthiopoulos, Jason; Fernández, Carmen; Redpath, S; Thirgood, S; Harwood, John (2010-05-27) - Journal article
    Background: Predators can have profound impacts on the dynamics of their prey that depend on how predator consumption is affected by prey density (the predator's functional response). Consumption by a generalist predator ...
  • A general discrete-time modeling framework for animal movement using multistate random walks 

    McClintock, Brett Thomas; King, Ruth; Thomas, Len; Matthiopoulos, Jason; McConnell, Bernie J; Morales, Juan (2012-08) - Journal article
    Recent developments in animal tracking technology have permitted the collection of detailed data on the movement paths of individuals from many species. However, analysis methods for these data have not developed at a ...
  • A generalised likelihood framework for partially observed capture-recapture-recovery models 

    King, Ruth; McCrea, R S (2014) - Journal article
    We provide a closed form likelihood expression for multi-state mark-recapture-recovery data when the state of an individual may be only partially observed. The corresponding su cient statistics are presented in addition ...
  • Generalized dimensions of images of measures under Gaussian processes 

    Falconer, Kenneth; Xiao, Yimin (2014-02-15) - Journal article
    We show that for certain Gaussian random processes and fields X:RN→Rd, Dq(μx) = min {d, 1/α Dq (μ)} a.s., for an index α which depends on Hölder properties and strong local nondeterminism of X, where q>1, where Dq denotes ...
  • Generalized energy inequalities and higher multifractal moments 

    Falconer, Kenneth John (Springer-Verlag, 2014-08-02) - Conference item
    We present a class of generalized energy inequalities and indicate their use in investigating higher multifractal moments, in particular Lq-dimensions of images of measures under Brownian processes, Lq-dimensions of almost ...
  • Generating continuous mappings with Lipschitz mappings 

    Cichon, J; Mitchell, James David; Morayne, M (2007-05) - Journal article
    If X is a metric space, then C-X and L-X denote the semigroups of continuous and Lipschitz mappings, respectively, from X to itself. The relative rank of C-X modulo L-X is the least cardinality of any set U\L-X where U ...
  • Generating the full transformation semigroup using order preserving mappings 

    Higgins, PM; Mitchell, James David; Ruskuc, Nikola (2003-09) - Journal article
    For a linearly ordered set X we consider the relative rank of the semigroup of all order preserving mappings O-X on X modulo the full transformation semigroup Ex. In other words, we ask what is the smallest cardinality of ...
  • Generating transformation semigroups using endomorphisms of preorders, graphs, and tolerances 

    Mitchell, James David; Morayne, Michal; Peresse, Yann Hamon; Quick, Martyn (2010-09) - Journal article
    Let ΩΩ be the semigroup of all mappings of a countably infinite set Ω. If U and V are subsemigroups of ΩΩ, then we write U≈V if there exists a finite subset F of ΩΩ such that the subsemigroup generated by U and F equals ...
  • Generators and relations for subsemigroups via boundaries in Cayley graphs 

    Gray, R; Ruskuc, Nik (2011-11) - Journal article
    Given a finitely generated semigroup S and subsemigroup T of S we define the notion of the boundary of T in S which, intuitively, describes the position of T inside the left and right Cayley graphs of S. We prove that if ...
  • Geometric grid classes of permutations 

    Albert, M.H.; Atkinson, M.D.; Bouvel, M.; Ruskuc, Nik; Vatter, V. (2013-11) - Journal article
    A geometric grid class consists of those permutations that can be drawn on a specified set of line segments of slope ±1 arranged in a rectangular pattern governed by a matrix. Using a mixture of geometric and language ...
  • The geometric mean of relative abundance indices : a biodiversity measure with a difference 

    Buckland, Stephen Terrence; Studeny, Angelika Caroline; Magurran, Anne; Illian, Janine Baerbel; Newson, Stuart (2011-09-02) - Journal article
    The 2010 Biodiversity Target of the Convention on Biological Diversity (CBD), set in 2002, which stated that there should be ‘a significant reduction of the current rate of biodiversity loss' by 2010, highlighted the need ...
  • Geometrisation of first-order logic 

    Dyckhoff, Roy; Negri, Sara (2015-06) - Journal article
    That every first-order theory has a coherent conservative extension is regarded by some as obvious, even trivial, and by others as not at all obvious, but instead remarkable and valuable; the result is in any case neither ...
  • Global analysis of cetacean line-transect surveys : detecting trends in cetacean density 

    Jewell, Rebecca Lucy; Thomas, Len; Harris, Catriona M; Kaschner, Kristin; Wiff, Rodrigo Alexis; Hammond, Philip Steven; Quick, Nicola Jane (2012-05-07) - Journal article
    Measuring the effect of anthropogenic change on cetacean populations is hampered by our lack of understanding about population status and a lack of power in the available data to detect trends in abundance. Often long-term ...