39,777 research outputs found
DISSPLA plotting routines for the G-189A EC/LS computer program
Data from a G-189A execution is formatted and plotted. The plotting may be done at the time of execution of the program. DISSPLA plot packages are used. The user has the choice of FR80 or TEKTRONIX output
Cooper pair correlations and energetic knock-out reactions
Two-nucleon removal (or knock-out) reactions at intermediate energies are a
developing tool for both nuclear spectroscopy and for the study of certain
nucleon correlations in very exotic and some stable nuclei. We present an
overview of these reactions with specific emphasis on the nature of the
two-nucleon correlations that can be probed. We outline future possibilities
and tests needed to fully establish these sensitivities.Comment: 12 pages, 3 figures: Contribution to the Volume 50 years of Nuclear
BCS edited by World Scientifi
The role of cultural values in understanding the challenges faced by female entrepreneurs in Nigeria
This article is (c) Emerald Group Publishing and permission has been granted for this version to appear here (http://bura.brunel.ac.uk/handle/2438/4036). Emerald does not grant permission for this article to be further copied/distributed or hosted elsewhere without the express permission from Emerald Group Publishing Limited.Purpose: This paper examines the challenges female entrepreneurs face in the development of their business in the context of Nigeria. In so doing, it addresses a gap in the literature on the experiences of female entrepreneurs in a non-Western context and acknowledges the contribution that women make in this area of work.
Design: It draws on survey data from 274 female entrepreneurs currently engaged in their businesses in three statesâLagos (Nigeriaâs largest city), Ogun, and Oyo within the south west of Nigeria.
Findings: Results indicate that female entrepreneurs are generally confident and resourceful and that they enjoy the challenge of entrepreneurial activity. As in the West, they experience difficulties relating to family commitments and access to finance â as well as problems gaining acceptance and accessing networks.
Originality: It is argued that cultural values specific to the situation mean that these challenges, while common to female entrepreneurs in other national contexts, âplay outâ differentially and that they are experienced with different levels of depth and âintensityâ. It is also argued that future research might uncover at a deeper level and drawing on qualitative methodology how some of the factors identified are experienced in womenâs day to day lives. The paper suggests some policy implications in the form of support for female entrepreneurs in this context
Catching the head, tail, and everything in between: a streaming algorithm for the degree distribution
The degree distribution is one of the most fundamental graph properties of
interest for real-world graphs. It has been widely observed in numerous domains
that graphs typically have a tailed or scale-free degree distribution. While
the average degree is usually quite small, the variance is quite high and there
are vertices with degrees at all scales. We focus on the problem of
approximating the degree distribution of a large streaming graph, with small
storage. We design an algorithm headtail, whose main novelty is a new estimator
of infrequent degrees using truncated geometric random variables. We give a
mathematical analysis of headtail and show that it has excellent behavior in
practice. We can process streams will millions of edges with storage less than
1% and get extremely accurate approximations for all scales in the degree
distribution.
We also introduce a new notion of Relative Hausdorff distance between tailed
histograms. Existing notions of distances between distributions are not
suitable, since they ignore infrequent degrees in the tail. The Relative
Hausdorff distance measures deviations at all scales, and is a more suitable
distance for comparing degree distributions. By tracking this new measure, we
are able to give strong empirical evidence of the convergence of headtail
Density of monodromy actions on non-abelian cohomology
In this paper we study the monodromy action on the first Betti and de Rham
non-abelian cohomology arising from a family of smooth curves. We describe
sufficient conditions for the existence of a Zariski dense monodromy orbit. In
particular we show that for a Lefschetz pencil of sufficiently high degree the
monodromy action is dense.Comment: LaTeX2e, 48 pages, Version substantially revised for publication. A
gap in the proof of the density for Lefschetz pencils is fixed. The case of
hyperelliptic monodromy is also treated in detai
Near-infrared and X-ray obscuration to the nucleus of the Seyfert 2 galaxy NGC 3281
We present the results of a near-infrared and X-ray study of the Seyfert 2
galaxy NGC 3281. Emission from the Seyfert nucleus is detected in both regions
of the electromagnetic spectrum, allowing us to infer both the equivalent line
of sight hydrogen column density, N_H = 71.0(+11.3,-12.3)e26/m^2 and the
extinction due to dust, A_V = 22+/-11 magnitudes (90% confidence intervals). We
infer a ratio of N_H/A_V which is an order of magnitude larger than that
determined along lines of sight in the Milky Way and discuss possible
interpretations. We consider the most plausible explanation to be a dense cloud
in the foreground of both the X-ray and infrared emitting regions which
obscures the entire X-ray source but only a fraction of the much larger
infrared source.Comment: 23 pages including 9 figure
Vigorous star formation in a bulge-dominated ERO at z = 1.34
We present near-IR spectroscopy of three Extremely Red Objects (EROs) using
the OHS/CISCO spectrograph at Subaru telescope. One target exhibits a strong
emission line which we identify as H-alpha at z = 1.34. Using new and existing
ground-based optical and near-IR imaging, and archival HST imaging, we argue
that this target is essentially an elliptical galaxy, with an old stellar
population of around 4E11 solar masses, but having a dust-enshrouded
star-forming component with a SFR of some 50--100 solar masses per yr. There is
no evidence that the galaxy contains an AGN. Analysis of a further two targets,
which do not exhibit any features in our near-IR spectra, suggests that one is
a quiescent galaxy in the redshift range 1.2 < z < 1.6, but that the other
cannot be conclusively categorised as either star-forming or quiescent.
Even though our first target has many of the properties of an old elliptical,
the ongoing star formation means that it cannot have formed_all_ of its stellar
population at high redshift. While we cannot infer any robust values for the
star formation rate in ellipticals at z > 1 from this one object, we argue that
the presence of an object with such a high SFR in such a small sample suggests
that a non-negligible fraction of the elliptical galaxy population may have
formed a component of their stellar population at redshifts z ~ 1--2. We
suggest that this is evidence for ongoing star formation in the history of
elliptical galaxies.Comment: Accepted by MNRAS 1 April 2005. Ten pages, six figure
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