162 research outputs found
Are We Teaching the IS 2009 Model Curriculum?
This article presents the results of research that gathered data about undergraduate information systems curricula and compared it to previous studies and the IS 2009 working model curriculum which is now named IS 2010 Model Curriculum after final approval. Data was collected from the websites of 240 colleges and universities identified as having information systems programs in colleges of business. The results indicate that although a core set of courses continues to be offered at schools, IS curricula continues to evolve but does not always match current curriculum models
Personality And IT Project Team Makeup
IT project success continues to present major problems for organizations. The CHAOS survey results for 2004 report that only 29% of IT projects were considered successful, 53% were challenged, and 18% were considered failures. Many of these problems are avoidable and it is important to understand the various success factors associated with IT projects. This study provides insight into improving these inadequate IT project outcomes by investigating the influence of IT project team member personality traits on project success factors. The “Big Five” factor model of personality is utilized to measure team member personality characteristics. Relationships between the Big Five personality traits and the project success factors of “on schedule” and “quality” are evaluated. Results indicate the personality trait of extroversion is positively associated with keeping the project on schedule, while the trait of openness to experience is negatively associated with keeping the project on schedule. In addition, conscientiousness was found to have a positive influence on project quality. Agreeableness was not evaluated and no significant relationship was found between emotional stability and project success
A survey of extended radio jets with Chandra and HST
We present the results from an X-ray and optical survey of a sample of 17
radio jets in AGN performed with Chandra and HST. The sample was selected from
the radio and is unbiased toward detection at shorter wavelengths, but
preferentially it includes beamed sources. We find that X-ray emission is
common on kpc-scales, with over half radio jets exhibiting at least one X-ray
knot on the Chandra images. The distributions of the radio-to-X-ray and
radio-to-optical spectral indices for the detected jets are similar to the
limits for the non-detections,suggesting all bright radio jets have X-ray
counterparts which will be visible in longer observations. Comparing the radio
and X-ray morphologies shows that the majority of the X-ray jets have
structures that closely map the radio. Analysis of the SED of the jet knots
suggest the knots in which the X-ray and radio morphologies track each other
produce X-rays by IC scattering of the Cosmic Microwave Background. The
remaining knots produce X-rays by the synchrotron process. Spectral changes are
detected along the jets, with the ratio of the X-ray-to-radio and
optical-to-radio flux densities decreasing from the inner to the outer regions.
This suggests the presence of an additional contribution to the X-ray flux in
the jet's inner part, either from synchrotron or IC of the stellar light.
Alternatively, in a pure IC/CMB scenario, the plasma decelerates as it flows
from the inner to the outer regions. Finally, the X-ray spectral indices for
the brightest knots are flat, indicating that the bulk of the luminosity of the
jets is emitted at GeV energies, and raising the interesting possibility of
future detections with GLAST.Comment: 26 pages, 6 ps figures, 6 jpeg figures (1 replaced); accepted for
publication in Ap
Hsp70 in mitochondrial biogenesis
The family of hsp70 (70 kilodalton heat shock protein) molecular chaperones plays an essential and diverse role in cellular physiology, Hsp70 proteins appear to elicit their effects by interacting with polypeptides that present domains which exhibit non-native conformations at distinct stages during their life in the cell. In this paper we review work pertaining to the functions of hsp70 proteins in chaperoning mitochondrial protein biogenesis. Hsp70 proteins function in protein synthesis, protein translocation across mitochondrial membranes, protein folding and finally the delivery of misfolded proteins to proteolytic enzymes in the mitochondrial matrix
XMM-Newton spectroscopy of an X-ray selected sample of RL AGNs
This paper presents the X-ray spectroscopy of an X-ray selected sample of 25
radio-loud (RL) AGNs extracted from the XBSS sample. The main goal is to study
the origin of the X-ray spectral differences usually observed between
radio-loud and radio-quiet (RQ) AGNs. To this end, a comparison sample of 53 RQ
AGNs has been also extracted from the same XBSS sample and studied together
with the sample of RL AGNs. We have focused the analysis on the distribution of
the X-ray spectral indices of the power-law component that models the large
majority of the spectra in both samples. We find that the mean X-ray energy
spectral index is very similar in the 2 samples and close to alpha_X~1.
However, the intrinsic distribution of the spectral indices is significantly
broader in the sample of RL AGNs. In order to investigate the origin of this
difference, we have divided the RL AGNs into blazars and ``non-blazars'', on
the basis of the available optical and radio information. We find strong
evidence that the broad distribution observed in the RL AGN sample is mainly
due to the presence of the blazars. Furthermore, within the blazar class we
have found a link between the X-ray spectral index and the value of the
radio-to-X-ray spectral index suggesting that the observed X-ray emission is
directly connected to the emission of the relativistic jet. This trend is not
observed among the ``non-blazars'' RL AGNs. This favours the hypothesis that,
in these latter sources, the X-ray emission is not significantly influenced by
the jet emission and it has probably an origin similar to the RQ AGNs. Overall,
the results presented here indicate that the observed distribution of the X-ray
spectral indices in a given sample of RL AGNs is strongly dependent on the
amount of relativistic beaming present in the selected sources.Comment: 18 pages, 10 figures, accepted for publication in A&
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