12,643 research outputs found
Close-packed structures and phase diagram of soft spheres in cylindrical pores
It is shown for a model system consisting of spherical particles confined in cylindrical pores that the first ten close-packed phases are in one-to-one correspondence with the first ten ways of folding a triangular lattice, each being characterized by a roll-up vector like the single-walled carbon nanotube. Phase diagrams in pressure-diameter and temperature-diameter planes are obtained by inherent-structure calculation and molecular dynamics simulation. The phase boundaries dividing two adjacent phases are infinitely sharp in the low-temperature limit but are blurred as temperature is increased. Existence of such phase boundaries explains rich, diameter-sensitive phase behavior unique for cylindrically confined systems
Near-infrared spectroscopy of the very low mass companion to the hot DA white dwarf PG1234+482
We present a near-infrared spectrum of the hot (
55,000 K) DA white dwarf PG 1234+482. We confirm that a very low mass companion
is responsible for the previously recognised infrared photometric excess. We
compare spectra of M and L dwarfs, combined with an appropriate white dwarf
model, to the data to constrain the spectral type of the secondary. We find
that uncertainties in the 2MASS photometry of the white dwarf prevent us
from distinguishing whether the secondary is stellar or substellar, and assign
a spectral type of L01 (M9-L1).Therefore, this is the hottest and youngest
( yr) DA white dwarf with a possible brown dwarf companion.Comment: 5 pages, 2 figures, accepted by MNRA
Are we Bridging the Divide in IWO Psychology?
This paper examines the knowledge transfer process within the profession of work and
organisational psychology. In consonance with the theme of the 2011 congress, it considers
the extent to which proposed âbridging mechanismsâ can provide useful vehicles for
operationalising the pursuit of the dual goal of improving both the well-being of individuals
and the effectiveness of work organizations. It considers the way in which the profession
attempts to ground its concepts in a sound evidence base and then successfully mobilise
this knowledge at the interface of research and practice. It does so by critically examining
the scientist-practitioner model and the ways in which this model can be operationalised by
practitioners and researchers. The criticism which is aimed at academics is that their
research is irrelevant; it explores narrow concepts too often with student samples.
Practitioners, on the other hand, are accused of too infrequently bringing scientific findings
from the research literature to their practice. The problem has been cast in terms of both
one of knowledge production and also knowledge transfer and is typified, at least in one
direction â the impact of research upon practice, by what has in other professions, most
notably medicine and more recently management, been called evidence-based practice.
Denise Rousseau, in her 2005 presidential address to the American Academy of
Management defined evidence-based management (EBM) as âtranslating principles based
on best evidence into organizational practicesâ and there have been a number of attempts
to invoke a similar model of evidence-based practice in the field of work and organisational
psychology. In 2007 Anderson described the academic-practitioner divide as ânaturalâ,
suggesting the way forward was to focus on âbridging mechanismsâ describing six which had
been proposed at the 1995 SIOP conference. What is the situation over decade later? To
what extent have these bridges been built? This paper explores the nature and extent of
these bridges by presenting case studies and findings from a UK survey of IWO psychologists
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