1,479 research outputs found
Seasonal Dynamics and Ecological Significance of Bird Diversity in Tipeshwar Wildlife Sanctuary, Maharashtra, India
This study aimed to assess the bird richness and abundance in the Tipeshwar Wildlife Sanctuary, located in the Yavatmal district of Maharashtra, India. The comprehensive survey identified a total of 256 bird species within the sanctuary, shedding light on the dynamic patterns of bird abundance across various seasons. The findings indicate an increase in bird population during the monsoon and winter months, contrasting with a decline observed in the summer and pre-monsoon periods. These results contribute to the understanding of the avian community within the Tipeshwar Wildlife Sanctuary, emphasizing its role as a habitat with a healthy environmental setup conducive to supporting diverse bird populations. The variations in bird abundance throughout the seasons underscore the dynamic nature of avian communities within this ecosystem
The Space Density of Compton-thick AGN
We constrain the number density and evolution of Compton-thick Active
Galactic Nuclei (AGN), and their contribution to the extragalactic X-ray
background. In the local Universe we use the wide area surveys from the Swift
and INTEGRAL satellites, while for high redshifts we explore candidate
selections based on mid-IR parameters. We present the properties of a sample of
211 heavily-obscured AGN candidates in the Extended Chandra Deep Field-South
(ECDF-S) selecting objects with f24/fR>1000 and R-K>4.5. The X-ray to mid-IR
ratios for these sources are significantly larger than that of star-forming
galaxies and ~2 orders of magnitude smaller than for the general AGN
population, suggesting column densities of NH>5x10^24 cm^-2. The space density
of CT AGN at z~2 derived from these observations is ~10^-5 Mpc^{-3}, finding a
strong evolution in the number of LX>10^44 erg/s sources from z=1.5 to 2.5.Comment: 4 pages, 3 figures, to appear in proceedings for 'X-ray Astronomy
2009', Bologna 09/2009, AIP Conference Series, Eds. A. Comastri, M. Cappi, L.
Angelini; author list fixe
Should scope of practice laws for advanced practice providers be revised?
The U.S. faces a projected shortage of primary care physicians. The authors of the June HPR newsletter discuss their studies showing that a care delivery model that expands the roles of nurse practitioners and physician assistants could help close the gap without affecting routine chronic disease care
The Hard X-Ray View of Reflection, Absorption, and the Disk-Jet Connection in the Radio-Loud AGN 3C 33
We present results from Suzaku and Swift observations of the nearby radio
galaxy 3C 33, and investigate the nature of absorption, reflection, and jet
production in this source. We model the 0.5-100 keV nuclear continuum with a
power law that is transmitted either through one or more layers of pc-scale
neutral material, or through a modestly ionized pc-scale obscurer. The standard
signatures of reflection from a neutral accretion disk are absent in 3C 33:
there is no evidence of a relativistically blurred Fe K emission line,
and no Compton reflection hump above 10 keV. We find the upper limit to the
neutral reflection fraction is R<0.41 for an e-folding energy of 1 GeV. We
observe a narrow, neutral Fe K line, which is likely to originate at
least 2,000 R_s from the black hole. We show that the weakness of reflection
features in 3C 33 is consistent with two interpretations: either the inner
accretion flow is highly ionized, or the black-hole spin configuration is
retrograde with respect to the accreting material.Comment: 12 pages, 11 figures, 4 tables. Accepted for publication in Ap
Design of High Speed Comparator
A new CMOS dynamic comparator using dual input single output differential amplifier as latch stage suitable for high speed analog - to - digital converters with High Spee d, low power dissipation and immune to. Back - to - back inverter in the latch stage is replaced with dual - input single output differential amplifier. This topology completely removes the noise that is present in the input. The stru cture shows lower power dissipation and higher speed than the conventional comparators. The circuit is simulated with 1V DC supply voltage and 250 MHz clock frequency. The proposed topology is based on two cross coupled differential pairs positive feedback and switchable current source ces, has a lower power dissipation, higher speed, less area, and it is shown to be very robust against transistor mismatch, n oise immunity
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