11 research outputs found
GRIPS - Gamma-Ray Imaging, Polarimetry and Spectroscopy
We propose to perform a continuously scanning all-sky survey from 200 keV to
80 MeV achieving a sensitivity which is better by a factor of 40 or more
compared to the previous missions in this energy range. The Gamma-Ray Imaging,
Polarimetry and Spectroscopy (GRIPS) mission addresses fundamental questions in
ESA's Cosmic Vision plan. Among the major themes of the strategic plan, GRIPS
has its focus on the evolving, violent Universe, exploring a unique energy
window. We propose to investigate -ray bursts and blazars, the
mechanisms behind supernova explosions, nucleosynthesis and spallation, the
enigmatic origin of positrons in our Galaxy, and the nature of radiation
processes and particle acceleration in extreme cosmic sources including pulsars
and magnetars. The natural energy scale for these non-thermal processes is of
the order of MeV. Although they can be partially and indirectly studied using
other methods, only the proposed GRIPS measurements will provide direct access
to their primary photons. GRIPS will be a driver for the study of transient
sources in the era of neutrino and gravitational wave observatories such as
IceCUBE and LISA, establishing a new type of diagnostics in relativistic and
nuclear astrophysics. This will support extrapolations to investigate star
formation, galaxy evolution, and black hole formation at high redshifts.Comment: to appear in Exp. Astron., special vol. on M3-Call of ESA's Cosmic
Vision 2010; 25 p., 25 figs; see also www.grips-mission.e
Risk factors associated with early failure in complex abdominal wall reconstruction: A 5 year single surgeon experience
The limitations of using risk factors to screen for blunt cerebrovascular injuries: the harder you look, the more you find
Traumatic Extracranial Vascular Injury: Evidence-Based Neuroimaging
Blunt trauma injuries are typically a result of motor vehicle crashes but can occur with any direct blow to the head or neck, strangulation, sports-related incidents, and manipulation of the spine. The majority of penetrating neck wounds are a result of guns and knives, with motor vehicle crashes and industrial and household accidents making up the remainder. Vascular injuries of the neck in blunt and penetrating trauma are an important determiner of morbidity and mortality and can occur through a variety of mechanisms, from direct transection, to shearing of blood vessels from hyperextension of the cervical spine, to disruption by fractures