5,761 research outputs found
Seasonal Occurrence of Bovine Mastitis Causing Organisms from Grazing Land of Western Ghats, India
Seasonal Prevalence of Bovine Mastitis Causing Organism during Summer, from Grazing Land of Western Ghats
Moisture management properties of eri silk knitted fabrics
389-395Moisture management and wicking properties of eri silk knitted fabrics have been studied. Three different knit structures, namely single jersey, single pique and honeycomb, have been developed with the combination of two different yarn count and tightness level. The fabrics developed are analyzed in terms of wetting time, spreading speed, absorption rate, and maximum wetting radius, accumulative one way transport index (AOTI) and overall moisture management capacity (OMMC). It is discerned that the variables, such as yarn count, fabric tightness and knitting structure, have a significant influence on the wicking and moisture management properties. The OMMC indexes of eri silk knitted fabric are found to range from ‘very good’ to “excellent’ category, which indicates the suitability of eri silk yarn to skin fit as well as active wear applications
A VLA Search for the Geminga Pulsar: A Bayesian Limit on a Scintillating Source
We derive an upper limit of 3 mJy (95% confidence) for the flux density at
317 MHz of the Geminga pulsar (J0633+1746). Our results are based on 7 hours of
fast-sampled VLA data, which we averaged synchronously with the pulse period
using a period model based on CGRO/EGRET gamma-ray data. Our limit accounts for
the fact that this pulsar is most likely subject to interstellar scintillations
on a timescale much shorter than our observing span. Our Bayesian method is
quite general and can be applied to calculate the fluxes of other scintillated
sources. We also present a Bayesian technique for calculating the flux in a
pulsed signal of unknown width and phase.
Comparing our upper limit of 3 mJy with the quoted flux density of Geminga at
102 MHz, we calculate a lower limit to its spectral index of 2.7. We discuss
some possible reasons for Geminga's weakness at radio wavelengths, and the
likelihood that many of the unidentified EGRET sources are also radio-quiet or
radio-weak Geminga-like pulsars.Comment: 27 pages, including figures. Published in Ap
Moisture management properties of eri silk knitted fabrics
Moisture management and wicking properties of eri silk knitted fabrics have been studied. Three different knit structures,namely single jersey, single pique and honeycomb, have been developed with the combination of two different yarn countand tightness level. The fabrics developed are analyzed in terms of wetting time, spreading speed, absorption rate, andmaximum wetting radius, accumulative one way transport index (AOTI) and overall moisture management capacity(OMMC). It is discerned that the variables, such as yarn count, fabric tightness and knitting structure, have a significantinfluence on the wicking and moisture management properties. The OMMC indexes of eri silk knitted fabric are found torange from ‘very good’ to “excellent’ category, which indicates the suitability of eri silk yarn to skin fit as well as activewear applications
A Search for Sub-Millisecond Pulsars
We have conducted a search of 19 southern Galactic globular clusters for
sub-millisecond pulsars at 660 MHz with the Parkes 64-m radio telescope. To
minimize dispersion smearing we used the CPSR baseband recorder, which samples
the 20 MHz observing band at the Nyquist rate. By possessing a complete
description of the signal we could synthesize an optimal filterbank in
software, and in the case of globular clusters of known dispersion measure,
much of the dispersion could be removed using coherent techniques. This allowed
for very high time resolution (25.6 us in most cases), making our searches in
general sensitive to sub-millisecond pulsars with flux densities greater than
about 3 mJy at 50 cm. No new pulsars were discovered, placing important
constraints on the proportion of pulsars with very short spin periods in these
clusters.Comment: 8 pages, 3 figures, to appear in Ap
Stellar population of the superbubble N206 in the LMC I. Analysis of the Of-type stars
Massive stars are the key agents of feedback. Consequently, quantitative
analysis of massive stars are required to understand how the feedback of these
objects shapes/ creates the large scale structures of the ISM. The giant HII
region N206 in the Large Magellanic Cloud contains an OB association that
powers a X-ray superbubble, serving as an ideal laboratory in this context. We
obtained optical spectra with the muti-object spectrograph FLAMES at the
ESO-VLT. When possible, the optical spectroscopy was complemented by UV spectra
from the HST, IUE, and FUSE archives. Detailed spectral classifications are
presented for our sample Of-type stars. For the quantitative spectroscopic
analysis we use the Potsdam Wolf-Rayet (PoWR) model atmosphere code. The
physical parameters and nitrogen abundances of our sample stars are determined
by fitting synthetic spectra to the observations. The stellar and wind
parameters of nine Of-type stars are used to construct wind momentum,luminosity
relationship. We find that our sample follows a relation close to the
theoretical prediction, assuming clumped winds. The most massive star in the
N206 association is an Of supergiant which has a very high mass-loss rate. Two
objects in our sample reveal composite spectra, showing that the Of primaries
have companions of late O subtype. All stars in our sample have an evolutionary
age less than 4 million years, with the O2-type star being the youngest. All
these stars show a systematic discrepancy between evolutionary and
spectroscopic masses. All stars in our sample are nitrogen enriched. Nitrogen
enrichment shows a clear correlation with increasing projected rotational
velocities. The mechanical energy input from the Of stars alone is comparable
to the energy stored in the N206 superbubble as measured from the observed
X-ray and H alpha emission.Comment: Accepted for the pubblication in Astronomy & Astrophysic
On the form of growing strings
Patterns and forms adopted by Nature, such as the shape of living cells, the
geometry of shells and the branched structure of plants, are often the result
of simple dynamical paradigms. Here we show that a growing self-interacting
string attached to a tracking origin, modeled to resemble nascent polypeptides
in vivo, develops helical structures which are more pronounced at the growing
end. We also show that the dynamic growth ensemble shares several features of
an equilibrium ensemble in which the growing end of the polymer is under an
effective stretching force. A statistical analysis of native states of proteins
shows that the signature of this non-equilibrium phenomenon has been fixed by
evolution at the C-terminus, the growing end of a nascent protein. These
findings suggest that a generic non-equilibrium growth process might have
provided an additional evolutionary advantage for nascent proteins by favoring
the preferential selection of helical structures.Comment: 4 pages, 3 figures. Accepted for publication in Phys. Rev. Let
Hyper-inflammatory Syndrome in a Child With COVID-19 Treated Successfully With Intravenous Immunoglobulin and Tocilizumab
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