2,065 research outputs found
VACTERL association
VACTERL association is a useful acronym for a condition characterised by the sporadic, non-random association of specific birth defects of multiple organ systems.We present one such case which had congenital abnormalities of renal,skeletal and cardiac system
Kienbock Disease
A case of a 27 years old female with history of pain in left wrists is presented. Investigations revealed necrosis of left lunate (Kienbock disease)
Awareness regarding female breast cancer in Kashmiri males - A study
Breast cancer is a major killer disease in females globally and in developing regions, where the early cancer detection facilities are unavailable, prognosis is even worse. Awareness about this disease can lead to early detection and thereby decrease the morbidity and mortality. A self designed questionnaire was used to study the level of awareness regarding breast cancer among males. The questionnaire had 15 questions and on the basis on score attained, the subjects were classified as having poor, average or good breast cancer awareness. Out of 624 participants, 555(89%) had poor breast cancer awareness and 47(7.5%) had average awareness. Only 22 (3.5%) had good awareness about breast cancer. The level of awareness regarding female breast cancer in Kashmiri males is very low. Measures need to be taken to spread awareness about this disease in males so that they can play a vital role in early detection of this disease
Parasites of cage cultured European seabass <i>Dicentrarchus Labrax</i> and gilthead seabream <i>Sparus aurata</i> from Sardinia (western Mediterranean): first results
European seabass Dicentrarchus labrax and gilthead seabream Sparus aurata are the most important marine finfish species intensively cultured in the Mediterranean. Many factors influenced the rapid increase in the production
of these species in the last two decades. One of the most important factors is the great development and diffusion
of sea-cage culture, because some of the parasite species has become a serious threat to cage-reared fish in other Mediterranean localities
TeV cosmic-ray proton and helium spectra in the myriad model II
Recent observations show that the cosmic ray nuclei spectra start to harden
above 100 GeV, in contradiction with the conventional steady-state cosmic ray
model. We had suggested that this anomaly is due to the propagation effect of
cosmic rays released from local young cosmic ray sources, the total flux of the
cosmic ray should be computed with the myriad model, where contribution from
sources in local catalog is added to the background. However, while the
hardening could be elegantly explained in this model, the model parameters
obtained from the fit skew toward a region with fast diffusion and low
supernova rate in the Galaxy, in tension with other observations. In this
paper, we further explore this model in order to set up a concordant picture.
Two possible improvements related to the cosmic ray sources have been
considered. Firstly, instead of the usual axisymmetric disk model, we
considered a spiral model of source distribution. Secondly, for the nearby and
young sources which are paramount to the hardening, we allow for an
energy-dependent escape time. We find that major improvement comes from the
energy-dependent escape time of the local sources, and with both modifications,
not only the cosmic ray proton and helium anomalies are solved, but also the
parameters attain reasonable range values compatible with other analysis.Comment: 13 pages, 7 figures, 1 table, accepted for publication in RA
The galactic antiproton spectrum at high energies: background expectation vs. exotic contributions
A new generation of upcoming space-based experiments will soon start to probe
the spectrum of cosmic ray antiparticles with an unprecedented accuracy and, in
particular, will open up a window to energies much higher than those accessible
so far. It is thus timely to carefully investigate the expected antiparticle
fluxes at high energies. Here, we perform such an analysis for the case of
antiprotons. We consider both standard sources as the collision of other cosmic
rays with interstellar matter, as well as exotic contributions from dark matter
annihilations in the galactic halo. Up to energies well above 100 GeV, we find
that the background flux in antiprotons is almost uniquely determined by the
existing low-energy data on various cosmic ray species; for even higher
energies, however, the uncertainties in the parameters of the underlying
propagation model eventually become significant. We also show that if the dark
matter is composed of particles with masses at the TeV scale, which is
naturally expected in extra-dimensional models as well as in certain parameter
regions of supersymmetric models, the annihilation flux can become comparable
to - or even dominate - the antiproton background at the high energies
considered here.Comment: 17 pages revtex4, 7 figures; minor changes (to match the published
version
The Stellar Halo in the Large Magellanic Cloud: Mass, Luminosity, and Microlensing Predictions
Recently obtained kinematic data has shown that the Large Magellanic Cloud
(LMC) possesses an old stellar halo. In order to further characterize the
properties of this halo, parametric King models are fit to the surface density
of RR Lyrae stars. Using data from both the MACHO and OGLE II microlensing
surveys, the model fits yield the center of their distribution at RA =
05:21.1+-0.8, Dec = -69:45+-6 (J2000) and a core radius of 1.42+-0.12 kpc. As a
check the halo model is compared with RR Lyrae star counts in fields near the
LMC's periphery previously surveyed with photographic plates. These data,
however, require a cautious interpretation. Several topics regarding the LMC
stellar halo are discussed. First, the properties of the halo imply a global
mass-to-light ratio of M/L_V = 5.3+-2.1 and a total mass of 1.6+-0.6 10^10
M_sun for the LMC in good agreement with estimates based on the rotation curve.
Second, although the LMC's disk and halo are kinematically distinct, the shape
of the surface density profile of the halo is remarkably similar to that of the
young disk. For example, the best-fit exponential scale length for the RR Lyrae
stars is 1.47+-0.08 kpc, which compares to 1.46 kpc for the LMC's blue light.
In the Galaxy, the halo and disk do not resemble each other like this. Finally,
a local maximum in the LMC's microlensing optical depth due to halo-on-disk
stellar self-lensing is predicted. For the parameters of the stellar halo
obtained, this maximum is located near MACHO events LMC-4 and LMC-23, and is
large enough to possibly account for these two events, but not for all of the
observed microlensing.Comment: 11 pages, 1 figure, accepted to ApJ Letter
A Pedagogical Discussion Concerning the Gravitational Energy Radiated by Keplerian Systems
We first discuss the use of dimensional arguments (and of the quadrupolar
emission hypothesis) in the derivation of the gravitational power radiated on a
circular orbit. Then, we show how to simply obtain the instantaneous power
radiated on a general Keplerian orbit by approximating it locally by a circle.
This allows recovering with a good precision, in the case of an ellipse, the
highly non trivial dependence on the eccentricity of the average power given by
general relativity. The whole approach is understandable by undergraduate
students.Comment: A simpler method has been used in the calculations, which requires
now only standard knowledge (the radius of curvature is defined by the normal
acceleration). Two figures have been added. Concerning the dimensional
analysis, the comparison with electromagnetism has been detaile
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