1,841 research outputs found
Investigation Into The Relationship Between Hurricane Storm Parameters and Damage
âEconomic damage, such as damage to property and infra-structure, from hurricane surges depends on two factors 1) the depth of coastal inundation and 2) the area covered by the surgeâ (Irish et. al 2007). Typically, damage estimates are developed after hurricanes have dissipated. To have the ability to predict hurricane damage in advance based upon various physical parameters would be a technical advance that could aid vulnerable coastal communities with hurricane planning. This thesis advances this goal forward by relating âTotal Normalized Damageâ to âSurge Scaleâ along with other key parameters. In this thesis Total Normalized Damages are compared to Surge Scale in three statistically significant ways: Un-separated Comparison, Separated Comparison and Separated Comparison without âmicro-canesâ. An attempt at the surge damage function has been presented in this thesis as a cornerstone of the research work contained herein. This thesis also examines the effect of different damage components and their uncertainties on Total Normalized Damage. Such damage estimates include wind damage, surge damage, and inland flooding, which were separated into individual damage categories
X-ray observations of the galaxy cluster PKS 0745-191: To the virial radius, and beyond
We measure X-ray emission from the outskirts of the cluster of galaxies PKS
0745-191 with Suzaku, determining radial profiles of density, temperature,
entropy, gas fraction, and mass. These measurements extend beyond the virial
radius for the first time, providing new information about cluster assembly and
the diffuse intracluster medium out to ~1.5 r_200, (r_200 ~ 1.7 Mpc ~ 15'). The
temperature is found to decrease by roughly 70 per cent from 0.3-1 r_200. We
also see a flattening of the entropy profile near the virial radius and
consider the implications this has for the assumption of hydrostatic
equilibrium when deriving mass estimates. We place these observations in the
context of simulations and analytical models to develop a better understanding
of non-gravitational physics in the outskirts of the cluster.Comment: 10 pages, 11 figures, accepted to MNRAS; expanded discussion of
analysis and uncertainties, results qualitatively unchange
Research poster: Water source partitioning for shrubland transpiration using innovative field methods
Research poste
X-ray enabled MOCASSIN: a 3D code for photoionized media
We present a new version of the fully 3D photoionization and dust radiative
transfer code, MOCASSIN, that uses a Monte Carlo approach for the transfer of
radiation. The X-ray enabled MOCASSIN allows a fully geometry independent
description of low-density gaseous environments strongly photoionized by a
radiation field extending from radio to gamma rays. The code has been
thoroughly benchmarked against other established codes routinely used in the
literature, using simple plane parallel models designed to test performance
under standard conditions. We show the results of our benchmarking exercise and
discuss applicability and limitations of the new code, which should be of
guidance for future astrophysical studies with MOCASSIN.Comment: Accepted for publication in ApJS 9 pages, 5 figure
Is Mira a magneto-dusty rotator?
We investigate the possibility that a magnetic field may be present in the
star Ceti (hereafter, Mira) and that the field plays a role in the star's
mass loss. The model presented here is an application of an earlier derived
theory that has been successfully employed for intermediate and high-mass
evolved stars, and is now extended to the low-mass end. The modelling shows
that it is possible to obtain a hybrid magnetohydrodynamic-dust-driven wind
scenario for Mira, in which the role of a magnetic field in the equatorial
plane of the star is dynamically important for producing a stellar wind. The
wind velocity and the temperatures obtained from the model appear consistent
with findings elsewhere.Comment: 5 pages, 2 figure
Clustering Properties of restframe UV selected galaxies I: the correlation length derived from GALEX data in the local Universe
We present the first measurements of the angular correlation function of
galaxies selected in the far (1530 A) and near (2310 A) Ultraviolet from the
GALEX survey fields overlapping SDSS DR5 in low galactic extinction regions.
The area used covers 120 sqdeg (GALEX - MIS) down to magnitude AB = 22,
yielding a total of 100,000 galaxies. The mean correlation length is ~ 3.7 \pm
0.6 Mpc and no significant trend is seen for this value as a function of the
limiting apparent magnitude or between the GALEX bands. This estimate is close
to that found from samples of blue galaxies in the local universe selected in
the visible, and similar to that derived at z ~ 3 for LBGs with similar rest
frame selection criteria. This result supports models that predict anti-biasing
of star forming galaxies at low redshift, and brings an additional clue to the
downsizing of star formation at z<1.Comment: Accepted for publication in GALEX Special ApJs, December 200
The "Solar Model Problem" Solved by the Abundance of Neon in Stars of the Local Cosmos
The interior structure of the Sun can be studied with great accuracy using
observations of its oscillations, similar to seismology of the Earth. Precise
agreement between helioseismological measurements and predictions of
theoretical solar models has been a triumph of modern astrophysics (Bahcall et
al. 2005). However, a recent downward revision by 25-35% of the solar
abundances of light elements such as C, N, O and Ne (Asplund et al. 2004) has
broken this accordance: models adopting the new abundances incorrectly predict
the depth of the convection zone, the depth profiles of sound speed and
density, and the helium abundance (Basu Antia 2004, Bahcall et al. 2005). The
discrepancies are far beyond the uncertainties in either the data or the model
predictions (Bahcall et al. 2005b). Here we report on neon abundances relative
to oxygen measured in a sample of nearby solar-like stars from their X-ray
spectra. They are all very similar and substantially larger than the recently
revised solar value. The neon abundance in the Sun is quite poorly determined.
If the Ne/O abundance in these stars is adopted for the Sun the models are
brought back into agreement with helioseismology measurements (Antia Basu 2005,
Bahcall et al. 2005c).Comment: 13 pages, 3 Figure
Accurate Estrogen Receptor Quantification in Patients with Negative and Low-Positive Estrogen-Receptor-Expressing Breast Tumors: Sub-Analyses of Data from Two Clinical Studies
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