Browsing by Classification "QA"
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A default prior distribution for contingency tables with dependent factor levels
(201401)  Journal articleA 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 ... 
Density estimation and time trend analysis of large herbivores in Nagarhole, India
(2005)  ThesisDensity estimates for six large herbivore species were obtained through analysis of line transect data from Nagarhole National Park, southwestern India, collected between 1989 and 2000. These species were Chital (Axis ... 
The dependence of coronal loop heating on the characteristics of slow photospheric motions
(20160606)  Journal articleThe Parker hypothesis assumes that heating of coronal loops occurs due to reconnection, induced when photospheric motions braid field lines to the point of current sheet formation. In this contribution we address the ... 
Depletion of nonlinearity in the pressure force driving NavierStokes flows : nonlinear depletion in NS flows
(20150417)  Journal articleThe dynamics of the velocity norms uLq for q ≥ 3, in NavierStokes flows is studied. The pressure term that drives this dynamics has a high degree of nonlinear depletion, which owes its origin to a genuine negative ... 
Description and seasonal detection of two potential whale calls recorded in the Indian Ocean
(201509)  Journal articleUnidentified acoustic signals are recorded by hydrophones placed in the world's oceans. Some of these sounds are suspected to originate from marine mammals. In this study, two acoustic signals recorded by two arrays at ... 
Design and analysis of line transect surveys for primates
(201010)  Journal articleLine transect surveys are widely used for estimating abundance of primate populations. The method relies on a small number of key assumptions, and if these are not met, substantial bias may occur. For a variety of reasons, ... 
Digit frequencies and Bernoulli convolutions
(20140627)  Journal articleIt is well known that when β is a Pisot number, the corresponding Bernoulli convolution ν(β) has Hausdorff dimension less than 1, i.e. that there exists a set A(β) with (ν(β))(A(β))=1 and dim_H(A(β))<1. We show explicitly ... 
Dimension and measure for generic continuous images
(2013)  Journal articleWe consider the Banach space consisting of continuous functions from an arbitrary uncountable compact metric space, X, into Rn. The key question is 'what is the generic dimension of f(X)?' and we consider two different ... 
Dimension conservation for selfsimilar sets and fractal percolation
(2015)  Journal articleWe introduce a technique that uses projection properties of fractal percolation to establish dimension conservation results for sections of deterministic selfsimilar sets. For example, let K be a selfsimilar subset of ... 
The dimension of projections of selfaffine sets and measures
(2015)  Journal articleLet E be a plane selfaffine set defined by affine transformations with linear parts given by matrices with positive entries. We show that if μ is a Bernoulli measure on E with dimHμ = dimLμ, where dimH and dimL denote ... 
Distance software: design and analysis of distance sampling surveys for estimating population size
(2010)  Journal article1. Distance sampling is a widely used technique for estimating the size or density of biological populations. Many distance sampling designs and most analyses use the software Distance. 2. We briefly review distance sampling ... 
Doubleobserver line transect methods : levels of independence
(201003)  Journal articleDoubleobserver line transect methods are becoming increasingly widespread, especially for the estimation of marine mammal abundance from aerial and shipboard surveys when detection of animals on the line is uncertain. The ... 
Doubleobserver line transect surveys with Markovmodulated Poisson process models for overdispersed animal availability
(2015)  Journal articleWe develop maximum likelihood methods for line transect surveys in which animals go undetected at distance zero, either because they are stochastically unavailable while within view or because they are missed when they are ... 
Effect of collisions on amplification of laser beams by Brillouin scattering in plasmas
(201310)  Journal articleWe report on particle in cell simulations of energy transfer between a laser pump beam and a counterpropagating seed beam using the Brillouin scattering process in uniform plasma including collisions. The results presented ... 
Effect of Prandtl's ration on balance in geophysical turbulence
(20150721)  Journal articleThe fluid dynamics of the atmosphere and oceans are to a large extent controlled by the slow evolution of a scalar field called ‘potential vorticity’, with relatively fast motions such as inertiagravity waves playing only ... 
An efficient acoustic density estimation method with human detectors applied to gibbons in Cambodia
(20160519)  Journal articleSome animal species are hard to see but easy to hear. Standard visual methods for estimating population density for such species are often ineffective or inefficient, but methods based on passive acoustics show more promise. ... 
Ellipsoidal vortices in rotating stratified fluids : beyond the quasigeostrophic approximation
(201501)  Journal articleWe examine the basic properties and stability of isolated vortices having uniform potential vorticity (PV) in a nonhydrostatic rotating stratified fluid, under the Boussinesq approximation. For simplicity, we consider a ... 
Embeddings into Thompson's group V and coCF groups
(20160428)  Journal articleLehnert and Schweitzer show in [21] that R. Thompson's group V is a cocontextfree (coCF ) group, thus implying that all of its finitely generated subgroups are also coCF groups. Also, Lehnert shows in his thesis that V ... 
Emergence of nontwisted magnetic fields in the Sun : jets and atmospheric response
(201512)  Journal articleAims. We study the emergence of a nontwisted flux tube from the solar interior into the solar atmosphere. We investigate whether the length of the buoyant part of the flux tube (i.e. λ) affects the emergence of the field ... 
Ends of semigroups
(20160727)  Journal articleWe define the notion of the partial order of ends of the Cayley graph of a semigroup. We prove that the structure of the ends of a semigroup is invariant under change of finite generating set and at the same time is inherited ...