2,079 research outputs found
Effects of Disability, Gender, and Level of Supervision on Ratings of Job Applicants
Using ratings of hypothetical job applicants with and without a disability obtained from both fulltime workers (n = 88) and undergraduates (n = 98), we examined the effects of disability (paraplegia, epilepsy, clinical depression, or non-disabled), gender, and nature of the job (supervisory or non-supervisory) on five job-relevant dependent measures. Contrary to our hypothesis, applicants with a disability were rated significantly higher in activity and potency than applicants without a disability. Further, also contrary to our predictions, gender and job type did not moderate the relationship between disability and applicant ratings. Post-hoc analyses revealed a significant gender by job type interaction; female applicants were viewed as more qualified than male applicants for the non-supervisory position, but the male applicants were viewed as more qualified than female applicants for the supervisory position. We use the flexible correction model (Wegener & Petty, 1997) to explicate the findings. Limitations and implications for future research on attitudes toward individuals with disabilities are discussed
Evidence that particle acceleration in hotspots of FR II galaxies is not constrained by synchrotron cooling
We study the hotspots of powerful radiogalaxies, where electrons accelerated
at the jet termination shock emit synchrotron radiation. The turnover of the
synchrotron spectrum is typically observed between infrared and optical
frequencies, indicating that the maximum energy of non-thermal electrons
accelerated at the shock is ~TeV for a canonical magnetic field of ~100 micro
Gauss. We show that this maximum energy cannot be constrained by synchrotron
losses as usually assumed, unless the jet density is unreasonably large and
most of the jet upstream energy goes to non-thermal particles. We test this
result by considering a sample of hotspots observed at radio, infrared and
optical wavelengths.Comment: 7 pages, 2 figures. To be appear in the proceedings of the conference
"Cosmic ray origin - beyond the standard models" (San Vito di Cadore, Italy,
September 2016
Particle acceleration and magnetic field amplification in the jets of 4C74.26
We model the multi-wavelength emission in the southern hotspot of the radio
quasar 4C74.26. The synchrotron radio emission is resolved near the shock with
the MERLIN radio-interferometer, and the rapid decay of this emission behind
the shock is interpreted as the decay of the amplified downstream magnetic
field as expected for small scale turbulence. Electrons are accelerated to only
0.3 TeV, consistent with a diffusion coefficient many orders of magnitude
greater than in the Bohm regime. If the same diffusion coefficient applies to
the protons, their maximum energy is only ~100 TeV.Comment: Accepted for publication in ApJ. 6 pages - 2 figures. Minor
correction
Raising Africa?: Celebrity and the Rhetoric of the White Saviour
The ‘White Savour’ is a timeworn vehicle for celebrities in Hollywood film, where actors perform as heroes who save the day against dark and ominous adversaries. Pop stars take on personas and ‘exotic’ characters as well. And with increasing visibility, the famous perform real-life hero roles as philanthropists for social causes around the so-called ‘developing’ world. This essay explores how the celebrity philanthropist is constructed as redeemer of distant Others and how this role mingles with a celebrity’s on-stage personas to create the White Saviour, a powerful brand of cultural authority. It examines the power of Bono, Jolie and Madonna as key figures in contemporary African celebrity aid and diplomacy work, and at Madonna and Jolie as famous mothers. I argue that their campaigns employ a universalizing rhetoric of individualism that reinscribes colonial narratives of Africa’s diverse peoples as passive and helpless, and that ultimately burnishes the celebrity brand
The Angst of the Everyday: Using Narrative to Provoke an Affective Understanding of Adolescence
This paper is written as a reflection on an interdisciplinary course I have recently taught on adolescence. I begin by noting the difficulties of negotiating theoretical claims and disciplinary insights about adolescence with a more embodied understanding of how it feels to be an adolescent, which, I argue, helps to humanize and enrich discussions and debates over the parameters of adolescent experience. I describe two narratives that served as springboards for deeper affective considerations of adolescent experience in my course: Paul Feig's Freaks and Geeks (1999) and Alice Munro's series of short stories, The Lives of Girls and Women (1971). I conclude with a brief commentary on narrative ethics, which helps me contemplate the ways in which imaginative narrative is a strong addition to an interdisciplinary study course
Cosmic ray acceleration to ultrahigh energy in radio galaxies
The origin of ultrahigh energy cosmic rays (UHECRs) is an open question. In
this proceeding, we first review the general physical requirements that a
source must meet for acceleration to 10-100 EeV, including the consideration
that the shock is not highly relativistic. We show that shocks in the backflows
of radio galaxies can meet these requirements. We discuss a model in which
giant-lobed radio galaxies such as Centaurus A and Fornax A act as
slowly-leaking UHECR reservoirs, with the UHECRs being accelerated during a
more powerful past episode. We also show that Centaurus A, Fornax A and other
radio galaxies may explain the observed anisotropies in data from the Pierre
Auger Observatory, before examining some of the difficulties in associating
UHECR anisotropies with astrophysical sources.Comment: 6 pages, 4 figures. Proceedings of UHECR 2018, 8-12 October 2018,
Paris, Franc
Amplification of perpendicular and parallel magnetic fields by cosmic ray currents
Cosmic ray (CR) currents through magnetised plasma drive strong instabilities
producing amplification of the magnetic field. This amplification helps explain
the CR energy spectrum as well as observations of supernova remnants and radio
galaxy hot spots. Using magnetohydrodynamic (MHD) simulations, we study the
behaviour of the non-resonant hybrid (NRH) instability (also known as the Bell
instability) in the case of CR currents perpendicular and parallel to the
initial magnetic field. We demonstrate that extending simulations of the
perpendicular case to 3D reveals a different character to the turbulence from
that observed in 2D. Despite these differences, in 3D the perpendicular NRH
instability still grows exponentially far into the non-linear regime with a
similar growth rate to both the 2D perpendicular and 3D parallel situations. We
introduce some simple analytical models to elucidate the physical behaviour,
using them to demonstrate that the transition to the non-linear regime is
governed by the growth of thermal pressure inside dense filaments at the edges
of the expanding loops. We discuss our results in the context of supernova
remnants and jets in radio galaxies. Our work shows that the NRH instability
can amplify magnetic fields to many times their initial value in parallel and
perpendicular shocks.Comment: Published in MNRAS. 14 pages, 12 figures, 2 tables. Replacement
corrects some typesetting error
Overwinter Phenology of Plants in a Polar Semi-desert
Arctic and temperate-latitude tundra plants must make efficient use of the growing season, because it is very short. A variety of leaf-development strategies permit growth in the cool summers. ... Winter phenology was observed under field conditions for 27 of 33 angiosperm species found on King Christian Island. ... The full significance of overwintering leaf condition and the variability of this pattern within the High Arctic needs further investigation
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