16,204 research outputs found
Correlations of the IR Luminosity and Eddington Ratio with a Hard X-ray Selected Sample of AGN
We use the SWIFT Burst Alert Telescope (BAT) sample of hard x-ray selected
active galactic nuclei (AGN) with a median redshift of 0.03 and the 2MASS J and
K band photometry to examine the correlation of hard x-ray emission to
Eddington ratio as well as the relationship of the J and K band nuclear
luminosity to the hard x-ray luminosity. The BAT sample is almost unbiased by
the effects of obscuration and thus offers the first large unbiased sample for
the examination of correlations between different wavelength bands. We find
that the near-IR nuclear J and K band luminosity is related to the BAT (14 -
195 keV) luminosity over a factor of in luminosity ()and thus is unlikely to be due to dust. We also find that the
Eddington ratio is proportional to the x-ray luminosity. This new result should
be a strong constraint on models of the formation of the broad band continuum.Comment: accepted to ApJ
An analytical and experimental study of heat transfer in a simulated Martian atmosphere Final report, 1 Nov. 1968 - 15 Oct. 1969
Convective heat transfer in simulated Martian atmospher
Islets of Langerhans Are Protected from Inflammatory Cell Recruitment during Reperfusion of Rat Pancreas Grafts
Background: Ischemia/reperfusion (I/R) injury plays a pivotal role in the development of graft pancreatitis, with ischemia time representing one of its crucial factors. However, it is unclear, whether exocrine and endocrine tissue experience similar inflammatory responses during pancreas transplantation (PTx). This study evaluated inflammatory susceptibilities of islets of Langerhans (ILH) and exocrine tissue after different preservation periods during early reperfusion. Methods: PTx was performed in rats following 2 h (2h-I) or 18 h (18h-I) preservation. Leukocyte-endothelial cell interactions (LEI) were analyzed in venules of acinar tissue and ILH in vivo over 2 h reperfusion. Nontransplanted animals served as controls. Tissue samples were analyzed by histomorphometry. Results: In exocrine venules leukocyte rolling predominated in the 2h-I group. In the 18h-I group, additionally, high numbers of adherent leukocytes were found. Histology revealed significant edema formation and leukocyte extravasation in the 18h-I group. Notably, LEI in postcapillary venules of ILH were significantly lower. Leukocyte rolling was only moderately enhanced and few leukocytes were found adherent. Histology revealed minor leukocyte extravasation. Conclusion: Ischemia time contributes decisively to the extent of the I/R-injury in PTx. However, ILH have a significantly lower susceptibility towards I/R, even when inflammatory reactions in adjacent exocrine tissue are evident. Copyright (C) 2010 S. Karger AG, Base
Summary of random vibration prediction procedures
Summary of random vibration prediction procedures for aerospace vehicles, with bibliograph
A novel method for unambiguous ion identification in mixed ion beams extracted from an EBIT
A novel technique to identify small fluxes of mixed highly charged ion beams
extracted from an Electron Beam Ion Trap (EBIT) is presented and practically
demonstrated. The method exploits projectile charge state dependent potential
emission of electrons as induced by ion impact on a metal surface to separate
ions with identical or very similar mass-to-charge ratio.Comment: 8 pages, 5 figure
A NLO analysis on fragility of dihadron tomography in high energy collisions
The dihadron spectra in high energy collisions are studied within the
NLO pQCD parton model with jet quenching taken into account. The high
dihadron spectra are found to be contributed not only by jet pairs close and
tangential to the surface of the dense matter but also by punching-through jets
survived at the center while the single hadron high spectra are only
dominated by surface emission. Consequently, the suppression factor of such
high- hadron pairs is found to be more sensitive to the initial gluon
density than the single hadron suppression factor.Comment: 4 pages, 4 figures, proceedings for the 19th international Conference
on ultra-relativistic nucleus-nucleus collisions (QM2006), Shanghai, China,
November 14-20, 200
Hyperon Form Factors from N_f=2+1 QCD
We present results from the QCDSF/UKQCD collaboration for the electromagnetic
and semi-leptonic form factors for the hyperons. The simulations are performed
on our new ensembles generated with 2+1 flavours of dynamical O(a)-improved
Wilson fermions. A unique feature of these configurations is that the quark
masses are tuned so that the singlet quark mass is held fixed at its physical
value. We use 5 such choices of the individual quark masses on 24^3x48 lattices
with a lattice spacing of about 0.078 fm.Comment: 7 pages, 6 figures, 1 table. Talk presented at The XXVIII
International Symposium on Lattice Field Theory, Villasimius, Italy, 14-19
June 201
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