13,411 research outputs found
Social work education, training and standards in the Asia-Pacific region
This article discusses the joint project between the International Association of Schools of Social Work (IASSW) and the International Federation of Social Workers (IFSW) to establish guidelines for the training and standard setting that elucidates what social work represents on a global level. While it is impossible to address all the issues that might be significant in such a large scope, attention is given to the challenges establishing global standards might encounter in a region as diverse as the Asia-Pacific
The equivalence of two graph polynomials and a symmetric function
The U-polynomial, the polychromate and the symmetric function generalization of the Tutte polynomial due to Stanley are known to be equivalent in the sense that the coefficients of any one of them can be obtained as a function of the coefficients of any other. The definition of each of these functions suggests a natural way in which to strengthen them which also captures Tutte's universal V-function as a specialization. We show that the equivalence remains true for the strong functions thus
answering a question raised by Dominic Welsh
The electronic spectra of protonated PANH molecules
Aims. This study was designed to examine the viability of protonated
nitrogen-substituted polycyclic aromatic hydrocarbons (H+PANHs) as candidates
for the carriers of the diffuse interstellar bands (DIBs). Methods. We obtained
the electronic spectra of two protonated PANH cations, protonated acridine and
phenanthridine, using parent ion photo-fragment spectroscopy and generated
theoretical electronic spectra using ab initio calculations. Results. We show
that the spectra of the two species studied here do not correspond to known
DIBs. However, based on the general properties derived from the spectra of
these small protonated nitrogen-substituted PAHs, we propose that larger H+PANH
cations represent good candidates for DIB carriers due to the expected
positions of their electronic transitions in the UV-visible and their narrow
spectral bands.Comment: 7 pages, 2 figures, accepted for publication in A&
An agent-based model of jaguar movement through conservation corridors
Wildlife corridors mitigate against habitat fragmentation by connecting otherwise isolated regions, bringing well established benefits to conservation both in principle and practice. Populations of large mammals in particular may depend on habitat connectivity, yet conservation managers struggle to optimise corridor designs with the rudimentary information generally available on movement behaviours. We present an agent-based model of jaguars (Panthera onca), scaled for fragmented habitat in Belize where proposals already exist for creating a jaguar corridor. We use a leastcost approach to simulate movement paths through alternative possible landscapes. Six different types of corridor and three control conditions differ substantially in their effectiveness at mixing agents across the environment despite relatively little difference in individual welfare. Our best estimates of jaguar movement behaviours suggest that a set of five narrow corridors may out-perform one wide corridor of the same overall area. We discuss the utility of ALife modelling for conservation management
The Benefish consortium 24 month report WP6: productivity modelling of OWI's and welfare intervention measures
In order to accurately model all costs and benefits associated with welfare interventions for farmed fish it is necessary to establish how any welfare actions affect productivity. Productivity modelling within Benefish has been conducted in WP6. WP6 aimed to model relationships between welfare interventions, changes in OWI’s and measures of productivity. It did so focusing only on the effects which were biological in nature: economic costs and benefits attributed to changes in productivity are addressed in WP8
Improved bounds for the number of forests and acyclic orientations in the square lattice
In a recent paper Merino and Welsh (1999) studied several counting problems on the square lattice . The authors gave the following bounds for the asymptotics of , the number of forests of , and , the number of acyclic orientations of : and .
In this paper we improve these bounds as follows: and . We obtain this by developing a method for computing the Tutte polynomial of the square lattice and other related graphs based on transfer matrices
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