15 research outputs found
Improving the Institutional Behaviour of Prisoners: Challenges and Opportunities for Behaviour Analysis
Prisoner misconduct presents a significant issue to correctional administrators, disrupting the orderly running of regimes, endangering safety, and negatively impacting the health and well-being of both prisoners and frontline staff. While an extensive literature has emerged around rehabilitative intervention with offenders, research efforts have been more commonly directed towards reducing post-release recidivism, resulting in a relatively sparse literature concerning the in-prison behaviour of prisoners. Persistent and rising levels of violent and disruptive behaviour in prisons highlight the need for greater research attention to be devoted to this issue. The field of applied behaviour analysis may be well placed to address this research deficit, with historical work in prisons and more recent efforts in juvenile justice settings suggesting that approaches derived from behaviour analysis may hold promise in correctional settings. This includes an emerging literature relating to the adaptation of school-wide Positive Behavioural Interventions and Supports (PBIS) to juvenile justice facilities. PBIS offers a framework within which to integrate a continuum of evidencebased practices to address the needs of the population to which it is applied. Preliminary evidence suggests that the approach is feasible, is viewed positively by residents and staff, and can be efficacious in improving resident behaviour in these settings. However, addressing prisoner misconduct within adult prisons may present distinct challenges to that of juvenile forensic settings, given differences in their size, staffing ratios, and focus on education and rehabilitation. This thesis aimed to contribute to the literature on identifying effective behavioural interventions for use with adult prisoners. First, a comprehensive systematic review was conducted to explore the range of interventions directed towards reducing prisoner misconduct and identify âwhat worksâ in reducing institutional infractions (Chapter 2). Findings suggested that cognitive behavioural approaches reduced violent infractions but not overall misconduct, while therapeutic community interventions and educational approaches reduced overall misconduct. Second, focus groups were conducted with prisoners and frontline staff (prison officers) to assess valued intervention outcomes and explore potential barriers for PBIS implementation (Chapter 3). Three overarching values were identified: a need for rehabilitation, consistency, and respect. Potential barriers to PBIS included pessimistic views towards rehabilitative approaches and perceptions of limited resources. Third, the intervention design process of a universal (Tier 1) intervention strategy was described that incorporated evidence-based practices, stakeholder values, and institutional data on prisoner behaviour, whilst also operating within available resources (Chapter 4). The resulting intervention was a peer-led approach that focussed on increasing prisoner engagement in purposeful activity. Fourth, a feasibility study was conducted to establish the viability of the intervention as well as the feasibility of research procedures in the setting (Chapter 5). The intervention successfully promoted prisoner engagement, with prisoners reporting beneficial effects on behaviour, social relationships, and well-being. Staff perceptions of the approach were more tempered but generally positive. Institutional records did not appear sufficiently sensitive to detect changes in prisoner misconduct, suggesting that alternative measurement approaches may need to be identified. Finally, opportunities and barriers to behaviour analytic research in adult prisons were explored (Chapter 6), highlighting the continued relevance of the seven dimensions of behaviour analysis to prisonbased research.<br/
Weak Interactions in Dimethyl Sulfoxide (DMSO)-Tertiary Amide Solutions: The Versatility of DMSO as a Solvent
The structures of equimolar mixtures of the commonly used polar aprotic solvents dimethylformamide (DMF) and dimethylacetamide (DMAc) in dimethyl sulfoxide (DMSO) have been investigated via neutron diffraction augmented by extensive hydrogen/deuterium isotopic substitution. Detailed 3-dimensional structural models of these solutions have been derived from the neutron data via Empirical Potential Structure Refinement (EPSR). The intermolecular center-of-mass (CoM) distributions show that the first coordination shell of the amides comprises âŒ13-14 neighbors, of which approximately half are DMSO. In spite of this near ideal coordination shell mixing, the changes to the amide-amide structure are found to be relatively subtle when compared to the pure liquids. Analysis of specific intermolecular atom-atom correlations allows quantitative interpretation of the competition between weak interactions in the solution. We find a hierarchy of formic and methyl C-H···O hydrogen bonds forms the dominant local motifs, with peak positions in the range of 2.5-3.0 Ă
. We also observe a rich variety of steric and dispersion interactions, including those involving the OâC-N amide Ï-backbones. This detailed insight into the structural landscape of these important liquids demonstrates the versatility of DMSO as a solvent and the remarkable sensitivity of neutron diffraction, which is critical for understanding weak intermolecular interactions at the nanoscale and thereby tailoring solvent properties to specific applications
Upper limits on the strength of periodic gravitational waves from PSR J1939+2134
The first science run of the LIGO and GEO gravitational wave detectors
presented the opportunity to test methods of searching for gravitational waves
from known pulsars. Here we present new direct upper limits on the strength of
waves from the pulsar PSR J1939+2134 using two independent analysis methods,
one in the frequency domain using frequentist statistics and one in the time
domain using Bayesian inference. Both methods show that the strain amplitude at
Earth from this pulsar is less than a few times .Comment: 7 pages, 1 figure, to appear in the Proceedings of the 5th Edoardo
Amaldi Conference on Gravitational Waves, Tirrenia, Pisa, Italy, 6-11 July
200
Improving the sensitivity to gravitational-wave sources by modifying the input-output optics of advanced interferometers
We study frequency dependent (FD) input-output schemes for signal-recycling
interferometers, the baseline design of Advanced LIGO and the current
configuration of GEO 600. Complementary to a recent proposal by Harms et al. to
use FD input squeezing and ordinary homodyne detection, we explore a scheme
which uses ordinary squeezed vacuum, but FD readout. Both schemes, which are
sub-optimal among all possible input-output schemes, provide a global noise
suppression by the power squeeze factor, while being realizable by using
detuned Fabry-Perot cavities as input/output filters. At high frequencies, the
two schemes are shown to be equivalent, while at low frequencies our scheme
gives better performance than that of Harms et al., and is nearly fully
optimal. We then study the sensitivity improvement achievable by these schemes
in Advanced LIGO era (with 30-m filter cavities and current estimates of
filter-mirror losses and thermal noise), for neutron star binary inspirals, and
for narrowband GW sources such as low-mass X-ray binaries and known radio
pulsars. Optical losses are shown to be a major obstacle for the actual
implementation of these techniques in Advanced LIGO. On time scales of
third-generation interferometers, like EURO/LIGO-III (~2012), with
kilometer-scale filter cavities, a signal-recycling interferometer with the FD
readout scheme explored in this paper can have performances comparable to
existing proposals. [abridged]Comment: Figs. 9 and 12 corrected; Appendix added for narrowband data analysi
Realising the electrochemical stability of graphene: scalable synthesis of an ultra-durable platinum catalyst for the oxygen reduction reaction
Creating effective and stable catalyst nanoparticle-coated electrodes that can withstand extensive cycling
is a current roadblock in realising the potential of polymer electrolyte membrane fuel cells. Graphene has
been proposed as an ideal electrode support material due to its corrosion resistance, high surface area
and high conductivity. However, to date, graphene-based electrodes suffer from high defect concentrations and non-uniform nanoparticle coverage that negatively affects performance; moreover, production methods are difficult to scale. Herein we describe a scalable synthesis for Pt nanoparticle-coated
graphene whereby PtCl2 is reduced directly by negatively charged single layer graphene sheets in solution. The resultant nanoparticles are of optimal dimensions and can be uniformly dispersed, yielding high
catalytic activity, remarkable stability, and showing a much smaller decrease in electrochemical surface
area compared with an optimised commercial catalyst over 30 000 cycles. The stability is rationalised by
identical location TEM which shows minimal nanoparticle agglomeration and no nanoparticle
detachment