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Search Results: 1 - 10 of 487068 matches for " S. R. Kulkarni "
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Maps of manifolds with indefinite metrics preserving certain geometrical entities
R. S. Kulkarni
International Journal of Mathematics and Mathematical Sciences , 1978, DOI: 10.1155/s0161171278000174
Abstract: It is shown that (i) a diffeomorphism of manifolds with indefinite metrics preserving degenerate r-plane sections is conformal, (ii) a sectional curvature-preservlng diffeomorphism of manifolds with indefinite metrics of dimension ¢ ‰ ¥4 is generically an isometry.
Discovery & Depth
S. R. Kulkarni
Physics , 2012,
Abstract: In the United States, the National Science Foundation (NSF), anticipating the no growth in funding, has commissioned a review of NSF-funded astronomy assets with the goal of determining how to best allocate funding for this decade. Inputs from members of the US community were sought. It is a matter of simple arithmetic that for a fixed level of funding many significant aspirations of Astro2010 cannot be met. Here, accepting the boundary conditions posed above, I have focused on fields centered on optical astronomy which offer the best opportunity for progress in this decade and thus offer the highest cost-benefit ratio. Readers may profit from reading the first seven sections.
Cosmic Explosions (Optical Transients)
S. R. Kulkarni
Physics , 2012,
Abstract: This paper is an extended summary of the talk I gave at IAU Symposium "New Horizons in Time Domain Astronomy" (Oxford, 2011). I first review the history of transients (which is intimately related to the advent of wide-field telescopic imaging; I then summarize wide field imaging projects. The motivations that led to the design of the Palomar Transient Factory (PTF) followed by a summary of the astronomical returns from PTF. I review the lessons learnt from PTF. I conclude that, during this decade, optical transient searches will continue to flourish and may even accelerate as surveys at other wavelengths -- notably radio, UV and X-ray -- come on line. As a result, I venture to suggest that specialized searches for transients will continue -- even into the LSST era. I end the article by discussing the importance of follow-up telescopes for transient object studies -- a topical issue given that in the US the Portfolio Review is under away.
Use of bhilawan oil as a cauterizing and tatooing agent in corneal ulcers
Kulkarni R,Shastri S,Kulkarni Anil
Indian Journal of Ophthalmology , 1983,
Colonization of pregnant women and their newborn infants with group-B streptococci
Kulkarni A,Pawar S,Dharmadhikari C,Kulkarni R
Indian Journal of Medical Microbiology , 2001,
Abstract: As group B streptococci (GBS) prevalence varies from place to place and this organism is responsible for serious infections in newborns such as septicaemia and meningitis, the present study was carried out to find the prevalence of GBS in pregnant women and their neonates. From June 1998 to April 1999 a total of 317 pregnant women and their neonates were examined for GBS. GBS colonization rate was 2.52% and 1.26% in pregnant women and their neonates respectively. Four sites - viz. throat, external ears, external nares and stump of umbilicus from neonates were found to be equally colonized by GBS immediately after birth and at the time of discharge from hospital, except the umbilicus which was not swabbed at the time of discharge. None of the neonates developed GBS related sepsis. Selective broth medium (SBM) was found to be a superior transport method over Stuart transport medium and filter paper method. All the isolates were sensitive to Ampicillin, Erythromycin, Penicillin followed by Chloramphenicol 66.6% (12/18). All the strains were resistant to Gentamicin, followed by Tetracycline 94.4% (17/18) and Kanamycin 88.8% (16/18).
An outbreak of cholera in the Sangli District of Maharashtra
Kulkarni R,Patil S,Kulkarni V,Ramteerthakar M
Indian Journal of Medical Microbiology , 2007,
Microsurgical anatomy of the middle cerebral artery
Pai S,Varma R,Kulkarni R
Neurology India , 2005,
Abstract: Background: The microsurgical anatomy of the middle cerebral artery (MCA) is of particular interest to the cerebrovascular surgeon. The purpose of this study was to define the microsurgical anatomy of the MCA and its various branches in the Indian population. Methods: Ten MCAs were studied from five cadaveric brain specimens. The authors studied the outer diameter, length, branches, perforators and site of these on the main trunk (M1), the division of the main trunk, the secondary trunks and their various cortical branches using the operating microscope under 5-20x magnification. Results: The outer diameter of the MCA main trunk ranges from 2.5 to 4 mm with a mean of 3.35 mm. The superolateral branches consisted of polar temporal artery and anterior temporal artery that had a common origin and sometimes the uncal artery or the accessory uncal artery. Perforators or lenticulostriate arteries were seen in the inferomedial surface all along the length of M1. Eight bifurcations and two trifurcations were noted. Cortical branches and their origin are discussed. Conclusion: Although the microsurgical anatomy of the MCA in Indian population correlated with the findings in the western literature, some structural and statistical variations were noted.
Applications of generalized Ruscheweyh derivative to univalent functions with finitely many coefficients
Abdul Rahman S. Juma,S. R. Kulkarni
Surveys in Mathematics and its Applications , 2009,
Abstract: By making use of the generalized Ruscheweyh derivative, theauthors investigate several interesting properties of certain subclasses of univalent functions having the form f(z) = z - Σn=2..m ((1 - β) en) / ((1 - nβ + α(1-n)) B1λ, μ(n)) zn - Σk=m+1..∞ akzk.
How Common Are Magnetars? The Consequences of Magnetic-Field Decay
Jeremy S. Heyl,S. R. Kulkarni
Physics , 1998, DOI: 10.1086/311628
Abstract: Ultramagnetized neutron stars or magnetars have been invoked to explain several astrophysical phenomena. We examine how the magnetic field of a magnetar will decay over time and how this decay affects the cooling of the object. We find that for sufficiently strong nascent fields, field decay alters the cooling evolution significantly relative to similarly magnetized neutron stars with constant fields. As a result, old magnetars can be expected to be bright in the soft X-ray band. The soft X-ray source RXJ~0720.4$-$3125 may well be the nearest such old magnetar.
Some applications of generalized Ruscheweyh derivatives involving a general fractional derivative operator to a class of analytic functions with negative coefficients I
Waggas Galib Atshan,S. R. Kulkarni
Surveys in Mathematics and its Applications , 2010,
Abstract: For certain univalent function f, we study a class of functions f as defined by making use of the generalized Ruscheweyh derivatives involving a general fractional derivative operator, satisfying Re { (zJ1λ, μ f(z))')/((1 -γ) J1λ, μ f(z) + γ z2(J1λ, μ f(z))" )} > β. A necessary and sufficient condition for a function to be in the class Aγλ, μ, ν(n, β) is obtained. In addition, our paper includes distortion theorem, radii of starlikeness, convexity and close-to-convexity, extreme points. Also, we get some results in this paper.
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