3,632 research outputs found
The Potting Shed: a drama in three acts
The Potting Shed, a psychological drama of family secrets, was presented by the JCU Little Theatre Workshop in March/April, 1982, and dedicated to Joseph O. Schell, S.J.
A review of this appeared on page 8 of The Carroll News, March 31, 1982.https://collected.jcu.edu/plays/1092/thumbnail.jp
How non-linear scaling relations unify dwarf and giant elliptical galaxies
Dwarf elliptical galaxies are frequently excluded from bright galaxy samples
because they do not follow the same linear relations in diagrams involving
effective half light radii R_e or mean effective surface brightnesses _e.
However, using two linear relations which unite dwarf and bright elliptical
galaxies we explain how these lead to curved relations when one introduces
either the half light radius or the associated surface brightness. In
particular, the curved _e - R_e relation is derived here. This and other
previously misunderstood curved relations, once heralded as evidence for a
discontinuity between faint and bright elliptical galaxies at M_B ~ -18 mag,
actually support the unification of such galaxies as a single population whose
structure (i.e. stellar concentration) varies continuously with stellar
luminosity and mass.Comment: 4 pages including 2 figures, to appear in "A Universe of dwarf
galaxies", Conf. Proc. (Lyon, June 14-18, 2010
Bose-Einstein condensate of kicked rotators with time-dependent interaction
A modification of the quantum kicked rotator is suggested with a
time-dependent delta-kicked interaction parameter which can be realized by a
pulsed turn-on of a Feshbach resonance. The mean kinetic energy increases
exponentially with time in contrast to a merely diffusive or linear growth for
the first few kicks for the quantum kicked rotator with a constant interaction
parameter. A recursive relation is derived in a self-consistent random phase
approximation which describes this superdiffusive growth of the kinetic energy
and is compared with numerical simulations. Unlike in the case of the quantum
rotator with constant interaction, a Lax pair is not found. In general the
delta-kicked interaction is found to lead to strong chaotic behaviour.Comment: 4 pages, 3 figure
Circles, columns and screenings: mapping the institutional, discursive, physical and gendered spaces of film criticism in 1940s London
This article revisits the period considered within ‘The Quality Film Adventure: British Critics and the Cinema 1942-1948’, mapping the professional cultures, working contexts and industry relationships that underpinned the aesthetic judgements and collective directions which John Ellis has observed within the critics published writings. Drawing on the records of the Critics’ Circle, Dilys Powell’s papers and Kinematograph Weekly, it explores the evolution of increasingly organised professional cultures of film criticism and film publicity, arguing that the material conditions imposed by war caused tensions between them to escalate. In the context of two major challenges to critical integrity and practice – the evidence given by British producer R.J. Minney in front of the 1948 Royal Commission on the Press and an ongoing libel case between a BBC critic and MGM – the different spaces of hospitality and film promotion became highly contested sites. This article focuses on the ways in which these spaces were characterised, used, and policed. It finds that the value and purpose of press screenings were hotly disputed and observes the way the advancement of women within one sector (film criticism) but not the other (film publicity) created particular difficulties, as key female critics avoided the more compromised masculine spaces of publicity, making them harder for publicists to reach and fuelling trade resentment. More broadly, the article asserts the need to consider film critics as geographically and culturally located audiences, who experience films as ‘professional’ viewers within extended and embodied cultures of habitual professional practice and physical space
On the average rank of LYM-sets
Let S be a finite set with some rank function r such that the Whitney numbers wi = |{x S|r(x) = i}| are log-concave. Given so that wk − 1 < wk wk + m, set W = wk + wk + 1 + … + wk + m. Generalizing a theorem of Kleitman and Milner, we prove that every F S with cardinality |F| W has average rank at least kwk + … + (k + m) wk + m/W, provided the normalized profile vector x1, …, xn of F satisfies the following LYM-type inequality: x0 + x1 + … + xn m + 1
The Millennium Galaxy Catalogue: The -- derived supermassive black hole mass function
Supermassive black hole mass estimates are derived for 1743 galaxies from the
Millennium Galaxy Catalogue using the recently revised empirical relation
between supermassive black hole mass and the luminosity of the host spheroid.
The MGC spheroid luminosities are based on -bulge plus
exponential-disc decompositions. The majority of black hole masses reside
between and an upper limit of . Using
previously determined space density weights, we derive the SMBH mass function
which we fit with a Schechter-like function. Integrating the black hole mass
function over gives a supermassive black
hole mass density of (
Mpc for early-type galaxies and ( Mpc for late-type galaxies. The errors are estimated from
Monte Carlo simulations which include the uncertainties in the --
relation, the luminosity of the host spheroid and the intrinsic scatter of the
-- relation. Assuming supermassive black holes form via baryonic
accretion we find that ( per cent of the Universe's
baryons are currently locked up in supermassive black holes. This result is
consistent with our previous estimate based on the -- (S{\'e}rsic
index) relation.Comment: 10 pages, 6 figures, accepted to MNRA
Constraints on discrete symmetries from anomaly cancellation in compactified superstring theories
Compactified string theories give rise to discrete symmetries which are
essential if they are to provide a realistic low energy theory. We find that in
a class of four dimensional string theories these symmetries are constrained by
similar conditions to those discrete anomaly cancellation conditions found in
the case the discrete symmetry is a residue of a spontaneously broken gauge
symmetry. Such conditions strongly constrain the allowed form of the low energy
effective theory.Comment: 8 pages, OUTP-93-14
Fostering Socio-Ecological Resilience to Wildfire by Interconnecting Knowledge Systems at Cal Poly Humboldt
The wildfire-related challenges of Northern California and many other regions in the western United States are daunting in scope and magnitude. Ecologically and culturally salient solutions that limit the negative impacts of wildfire and promote resilience of human and ecological systems will require newer approaches. Through Cal Poly Humboldt and the Fire Resilience Institute, there is greater emphasis on the interconnection of knowledge systems across education, training, research, and management. Here we highlight several on-going efforts that seek to enhance the fire resilience workforce, promote socio-ecological resilience through interdisciplinary projects, and inform management through monitoring and research projects that intentionally incorporate multiple knowledge systems. Shifting to a more inclusive process has many potential benefits but will also pose challenges and require modification of approaches. Here we emphasize some on-going efforts at Cal Poly Humboldt to intentionally bridge knowledge systems to make advances on wildfire-related challenges. Socio-ecological resilience and coexistence with fire can be fostered but the long-term effectiveness will greatly benefit from approaches that are inclusive, equitable, and interconnected across the many stakeholders affected and disciplines involved
The Host Galaxies of Low-mass Black Holes
Using HST observations of 147 host galaxies of low-mass black holes (BHs), we
systematically study the structures and scaling relations of these active
galaxies. Our sample is selected to have central BHs with virial masses
~10^5-10^6 solar mass. The host galaxies have total I-band magnitudes of
-23.2<M_I<-18.8 mag and bulge magnitudes of -22.9<M_I<-16.1 mag. Detailed
bulge-disk-bar decompositions with GALFIT show that 93% of the galaxies have
extended disks, 39% have bars and 5% have no bulges at all at the limits of our
observations. Based on the Sersic index and bulge-to-total ratio, we conclude
that the majority of the galaxies with disks are likely to contain pseudobulges
and very few of these low-mass BHs live in classical bulges. The fundamental
plane of our sample is offset from classical bulges and ellipticals in a way
that is consistent with the scaling relations of pseudobulges. The sample has
smaller velocity dispersion at fixed luminosity in the Faber-Jackson plane,
compared with classical bulges and elliptical galaxies. The galaxies without
disks are structurally more similar to spheroidals than to classical bulges
according to their positions in the fundamental plane, especially the
Faber-Jackson projection. Overall, we suggest that BHs with mass < 10^6 solar
mass live in galaxies that have evolved secularly over the majority of their
history. A classical bulge is not a prerequisite to host a black hole.Comment: 49 pages, 9 figures, accepted by Ap
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