8,917 research outputs found
Laser diagnostics for NTP fuel corrosion studies
Viewgraphs and explanations on laser diagnostics for nuclear thermal propulsion (NTP) fuel corrosion studies are presented. Topics covered include: NTP fuels; U-Zr-C system corrosion products; planar laser-induced fluorescence (PLIF); utilization of PLIF for corrosion product characterization of nuclear thermal rocket fuel elements under test; ZrC emission spectrum; and PLIF imaging of ZrC plume
Exploring Entrepreneurial Orientation in First- and Continuing-Generation College Graduates
Numerous studies have explored first-generation college student experiences leading up to and throughout their time seeking a bachelor’s degree. Other research has investigated the relationship between risk perception or self-efficacy traits and entrepreneurial orientation. The purpose of this study is to fill the gap between these two research streams by exploring the relationship of entrepreneurial orientation in, and between, first- and continuing-generation college graduates, specifically evaluating their post-graduation experience. This project explores entrepreneurial orientation, risk-taking, self-efficacy, and familial obligations to explore potential similarities and differences between first-and continuing-generation graduates. Specifically, this study hypothesized that first-generation college graduates would have greater entrepreneurial orientation, compared to continuing-generation graduates. Furthermore, the relationship between graduate type and entrepreneurship orientation was thought to be mediated by risk-taking. Results showed that, as predicted, risk-taking was positively correlated with entrepreneurial orientation but that graduate type predicted neither entrepreneurial orientation nor risk-taking
Allometry and growth of eight tree taxa in United Kingdom woodlands.
This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative
Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0As part of a project to develop predictive ecosystem models of United Kingdom woodlands we have collated data from two United Kingdom woodlands - Wytham Woods and Alice Holt. Here we present data from 582 individual trees of eight taxa in the form of summary variables relating to the allometric relationships between trunk diameter, height, crown height, crown radius and trunk radial growth rate to the tree's light environment and diameter at breast height. In addition the raw data files containing the variables from which the summary data were obtained. Large sample sizes with longitudinal data spanning 22 years make these datasets useful for future studies concerned with the way trees change in size and shape over their life-span
XMM-Newton observations of the first unidentified TeV gamma-ray source TeV J2032+4130
(abridged) The first unidentified very high energy gamma ray source (TeV
J2032+4130) in the Cygnus region has been the subject of intensive search for a
counterpart source at other wavelengths. A deep ( ksec) exposure of
TeV J2032+4130 with \textit{XMM-Newton} has been obtained. The contribution of
point sources to the observed X-ray emission from TeV J2032+4130 is subtracted
from the data. The point-source subtracted X-ray data are analyzed using blank
sky exposures and regions adjacent to the position of TeV J2032+4130 in the
field of view covered by the XMM-Newton telescopes to search for diffuse X-ray
emission. An extended X-ray emission region with a full width half maximum
(FWHM) size of arc min is found. The centroid of the emission is
co-located with the position of TeV J2032+4130.The energy spectrum of the
emission coinciding with the position and extension of TeV J2032+4130 can be
modeled by a power-law model with a photon index
and an energy flux
integrated between 2 and 10 keV of ergs/(cm s) which is lower than the very high energy gamma-ray
flux observed from TeV J2032+4130. We conclude that the faint extended X-ray
emission discovered in this observation is the X-ray counterpart of TeV
J2032+4130. Formally, it can not be excluded that the extended emission is due
to an unrelated population of faint, hot ( keV) unresolved
point-sources which by chance coincides with the position and extension of TeV
J2032+4130. We discuss our findings in the frame of both hadronic and leptonic
gamma-ray production scenarios.Comment: 5 Pages, 3 Figures, accepted for publication in A&
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