2,002 research outputs found
Signed degree sets in signed graphs
The set D of distinct signed degrees of the vertices in a signed graph G is
called its signed degree set. In this paper, we prove that every non-empty set
of positive (negative) integers is the signed degree set of some connected
signed graph and determine the smallest possible order for such a signed graph.
We also prove that every non-empty set of integers is the signed degree set of
some connected signed graph
Neutrino Induced Upward Going Muons from a Gamma Ray Burst in a Neutrino Telescope of Km^2 Area
The number of neutrino induced upward going muons from a single Gamma Ray
Burst (GRB) expected to be detected by the proposed kilometer scale IceCube
detector at the South Pole location has been calculated. The effects of the
Lorentz factor, total energy of the GRB emitted in neutrinos and its distance
from the observer (red shift) on the number of neutrino events from the GRB
have been examined. The present investigation reveals that there is possibility
of exploring the early Universe with the proposed kilometer scale IceCube
neutrino telescope.Comment: 18pages, 5 figures. Physical Review D in pres
Ruminal lactic acidosis in cow: clinical assessment
ABSTRACT Ruminal lactic acidosis is a condition that arises in ruminants due to the ingestion of excess quantities of easily digestible grains leading to diarrhea, anorexia and physiological derangements which can be fatal in severe cases. A clinical case of cow with history of rice flour ingestion showing signs of acute ruminal lactic acidosis was managed. The pH of ruminal fluid was 5.1. The number of live protozoa in the ruminal fluid was almost nil. Blood analysis confirmed marked alterations due to dehydration. Electrolyte imbalance was evident in biochemical tests. Cow was treated with intraruminal administration of Magnesium hydroxide and Sodium bicarbonate. Full recovery was achieved without any complications
Ruminal lactic acidosis in cow: clinical assessment
ABSTRACT Ruminal lactic acidosis is a condition that arises in ruminants due to the ingestion of excess quantities of easily digestible grains leading to diarrhea, anorexia and physiological derangements which can be fatal in severe cases. A clinical case of cow with history of rice flour ingestion showing signs of acute ruminal lactic acidosis was managed. The pH of ruminal fluid was 5.1. The number of live protozoa in the ruminal fluid was almost nil. Blood analysis confirmed marked alterations due to dehydration. Electrolyte imbalance was evident in biochemical tests. Cow was treated with intraruminal administration of Magnesium hydroxide and Sodium bicarbonate. Full recovery was achieved without any complications
Probing Pseudo-Dirac Neutrino through Detection of Neutrino Induced Muons from GRB Neutrinos
The possibility to verify the pseudo-Dirac nature of neutrinos is
investigated here via the detection of ultra high energy neutrinos from distant
cosmological objects like GRBs. The very long baseline and the energy range
from TeV to EeV for such neutrinos invokes the likelihood to
probe very small pseude-Dirac splittings. The expected secondary muons from
such neutrinos that can be detected by a kilometer scale detector such as
ICECUBE is calculated. The pseudo-Dirac nature, if exists, will show a
considerable departure from flavour oscillation scenario in the total yield of
the secondary muons induced by such neutrinos.Comment: 11 pages, 3figure
Relationship between incidence of Leucinodes orbonalis (Guenee) and Chlorophyll content in leaves of Brinjal (Solanum melongena L.)
The present study on biochemical basis of resistance against Leucinodes orbonalis infestation was conducted during the year 2011-2012. The results revealed that highest chlorophyll-‘a’- content of 0.497 mg/gfw was recorded in the susceptible genotype SHB-1.The lowest amount of 0.319 and 0.381 mg/gfw was observed in the resistant genotypes Brinjal-85 and Local long respectively, which were significantly different from other evaluated genotypes. The chlorophyll ‘a’content was positively correlated with the brinjal shoot and fruit borer infestation. Thehighest chlorophyll -‘b’- content of 0.442 mg/gfw was recorded at 70 DAT (days after transplanting). The amount of chlorophyll -‘b’- varied significantly among the genotypes at different ages and decreased with the age of crop. The average highest amount of chlorophyll -‘b’- was estimated in the genotype SBH-1 which was significantly at par with hybrid SBH-2. The lowest chlorophyll -‘b’- content was recorded at 40 DAT in the genotype Brinjal-85 followed by Local Long. The lowest amount of total chlorophyll was estimated in the resistant variety as compared to susceptible therefore exhibiting lowest level of infestation
On the X-ray lines in the afterglows of GRBs
The observation of X-ray lines in the afterglow of GRB 011211 has been
reported, and challenged. The lines were interpreted as blue-shifted X-rays
characteristic of a set of photoionized ``metals'', located in a section of a
supernova shell illuminated by a GRB emitted a couple of days after the
supernova explosion. We show that the most prominent reported lines coincide
with the ones predicted in the ``cannonball'' model of GRBs. In this model, the
putative signatures are Hydrogen lines, boosted by the (highly relativistic)
motion of the cannonballs (CBs). The corresponding Doppler boost can be
extracted from the fit to the observed I-, R- and V-band light-curves of the
optical afterglow of GRB 011211, so that, since the redshift is also known, the
line energies are --in the CB model-- predicted. We also discuss other GRBs of
known redshift which show spectral features generally interpreted as Fe lines,
or Fe recombination edges. The ensemble of results is very encouraging from the
CB-model's point of view, but the data on each individual GRB are not good
enough to draw (any) objectively decisive conclusions. We outline a strategy
for X-ray observers to search for lines which, in the CB model, move
predictably from higher to lower energies.Comment: Accepted for publication in Ap
Gamma-Ray Bursts from Neutron Star Kicks
The idea that gamma-ray bursts might be a kind of phenomena associated with
neutron star kicks was first proposed by Dar & Plaga (1999). Here we study this
mechanism in more detail and point out that the neutron star should be a high
speed one (with proper motion larger than km/s). It is shown that
the model agrees well with observations in many aspects, such as the
energetics, the event rate, the collimation, the bimodal distribution of
durations, the narrowly clustered intrinsic energy, and the association of
gamma-ray bursts with supernovae and star forming regions. We also discuss the
implications of this model on the neutron star kick mechanism, and suggest that
the high kick speed were probably acquired due to the electromagnetic rocket
effect of a millisecond magnetar with an off-centered magnetic dipole.Comment: 12 pages, no figures, ApJ in press (minor revision with respect to
Version 2
A Study of the Day - Night Effect for the Super - Kamiokande Detector: I. Time Averaged Solar Neutrino Survival Probability
This is the first of two articles aimed at providing comprehensive
predictions for the day-night (D-N) effect for the Super-Kamiokande detector in
the case of the MSW \nu_e \to \numt transition solution of the solar neutrino
problem. The one-year averaged probability of survival of the solar \nue
crossing the Earth mantle, the core, the inner 2/3 of the core, and the (core +
mantle) is calculated with high precision (better than 1%) using the elliptical
orbit approximation (EOA) to describe the Earth motion around the Sun. Results
for the survival probability in the indicated cases are obtained for a large
set of values of the MSW transition parameters and
from the ``conservative'' regions of the MSW solution,
derived by taking into account possible relatively large uncertainties in the
values of the B and Be neutrino fluxes. Our results show that the
one-year averaged D-N asymmetry in the survival probability for
neutrinos crossing the Earth core can be, in the case of , larger than the asymmetry in the probability for (only mantle
crossing + core crossing) neutrinos by a factor of up to six. The enhancement
is larger in the case of neutrinos crossing the inner 2/3 of the core. This
indicates that the Super-Kamiokande experiment might be able to test the
region of the MSW solution of the solar neutrino
problem by performing selective D-N asymmetry measurements.Comment: LaTeX2e - 18 Text Pages + 21 figures = 39 Pages. - Figures in PS +
text file sk1b14.tex requires two auxiliary files (included
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