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Search Results: 1 - 10 of 223968 matches for " R. Sahai "
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Rhinosporidiosis of lacrimal sac
Jain M,Sahai R
Indian Journal of Ophthalmology , 1974,
An Extreme High-Velocity Bipolar Outflow in the Pre-Planetary Nebula IRAS 08005-2356
R. Sahai,N. A. Patel
Physics , 2015, DOI: 10.1088/2041-8205/810/1/L8
Abstract: We report interferometric mapping of the bipolar pre-planetary nebula IRAS 08005-2356 with an angular-resolution of ~1"-5", using the Submillimeter Array (SMA), in the 12CO J=2-1, 3-2, 13CO J=2-1 and SiO J=5-4 (v=0) lines. Single-dish observations, using the SMT 10-m, were made in these lines as well as in the CO J=4-3 and SiO J-6-5 (v=0) lines. The lines profiles are very broad, showing the presence of a massive (>0.1 Msun), extreme high-velocity outflow (V~200 km/s) directed along the nebular symmetry axis derived from the HST imaging of this object. The outflow's scalar momentum far exceeds that available from radiation pressure of the central post-AGB star, and it may be launched from an accretion disk around a main-sequence companion. We provide indirect evidence for such a disk from its previously published, broad H-alpha emission profile, which we propose results from Ly-beta emission generated in the disk followed by Raman-scattering in the innermost regions of a fast, neutral wind.
Are Large, Cometary-Shaped Proplyds really (free-floating) EGGs?
R. Sahai,R. Guesten,M. R. Morris
Physics , 2012, DOI: 10.1088/2041-8205/761/2/L21
Abstract: We report the detection of strong and compact molecular line emission (in the CO J=3-2, 4-3, 6-5, 7-6, 13CO J=3-2, HCN and HCO+ J=4-3 transitions) from a cometary-shaped object (Carina-frEGG1) in the Carina star-forming region (SFR) previously classified as a photoevaporating protoplanetary disk (proplyd). We derive a molecular mass of 0.35 Msun for Carina-frEGG1, which shows that it is not a proplyd, but belongs to a class of free-floating evaporating gas globules (frEGGs) recently found in the Cygnus SFR by Sahai, Morris & Claussen (2012). Archival Adaptive Optics near-IR (Ks) images show a central hourglass-shaped nebula. The derived source luminosity (about 8-18 Lsun), the hourglass morphology, and the presence of collimated jets seen in HST images, imply the presence of a jet-driving, young, low-mass star deeply embedded in the dust inside Carina-frEGG1. Our results suggest that the true nature of many or most such cometary-shaped objects seen in massive SFRs and previously labelled as proplyds has been misunderstood, and that these are really frEGGs.
Multipolar Bubbles, Point-Symmetry and Jets in Dying Stars
R. Sahai,M.R. Morris
Revista mexicana de astronomía y astrofísica , 2003,
Topical timolol and lipid profile
Manoher J,Sharma A,Sahai R
Indian Journal of Ophthalmology , 1995,
Abstract: To evaluate the effects of topical timolol on lipid profile, blood samples from 25 patients (16 males and 9 females) were analysed before topical instillation of 0.5% timolol maleate and thereafter at one month and two months. After two months of therapy, the level of high density lipoprotein (HDL) decreased significantly (p < 0.02). The levels of low density lipoprotein (LDL), very low density lipoprotein (VLDL) and triglyceride increased but the changes were not statistically significant. Since low level of HDL is strongly associated with increased risk of myocardial infarction, our study cautions use of topical timolol in patients with low levels of HDL or with previous history of coronary heart disease.
Multifractal analysis of low-latitude geomagnetic fluctuations
M. J. A. Bolzan, R. R. Rosa,Y. Sahai
Annales Geophysicae (ANGEO) , 2009,
Abstract: The technique of large deviation multifractal spectrum has shown that the high-latitude (77.5° N, 69.2° W) geomagnetic fluctuations can be described from direct dissipation process or loading-unloading regimes of the solar wind-magnetosphere coupling. In this paper, we analyze the H-component of low-latitude (22.4° S, 43.6° W) geomagnetic field variability observed during the month of July 2000 at the Geomagnetic Observatory, Vassouras, RJ, Brazil. The variability pattern during this period is a mixture of quiet and disturbed days including the Bastille Day intense geomagnetic storm on 15 July. Due to the complexity of this data, we pursue a detailed analysis of the geomagnetic fluctuations in different time scales including a multifractal approach using the singular power spectrum deviations obtained from the wavelet transform modulus maxima (WTMM). The results suggest, as observed from high-latitude data, the occurrence of low-latitude multifractal processes driving the intermittent coupling between the solar wind-magnetosphere and geomagnetic field variations. On finer scales possible physical mechanisms in the context of nonlinear magnetosphere response are discussed.
Dynamics of the Molecular Jets in the Archetypical Preplanetary Nebula, IRAS 16342-3814
M.R. Morris,R. Sahai,M. Claussen
Revista mexicana de astronomía y astrofísica , 2003,
Shocked and Scorched: The Tail of a Tadpole in an Interstellar Pond
R. Sahai,M. R. Morris,M. J. Claussen
Physics , 2012, DOI: 10.1088/0004-637X/751/1/69
Abstract: We report multi-wavelength observations of the far-infrared source IRAS 20324+4057, including high-resolution optical imaging with HST, and ground-based near-infrared, millimeter-wave and radio observations. These data show an extended, limb-brightened, tadpole-shaped nebula with a bright, compact, cometary nebula located inside the tadpole head. Our molecular line observations indicate that the Tadpole is predominantly molecular, with a total gas mass exceeding 3.7 Msun. Our radio continuum imaging, and archival Spitzer IRAC images, show the presence of additional tadpole-shaped objects in the vicinity of IRAS 20324+4057 that share a common E-W head-tail orientation: we propose that these structures are small, dense molecular cores that originated in the Cygnus cloud and are now being (i) photoevaporated by the ultraviolet radiation field of the Cyg OB2 No. 8 cluster located to the North-West, and (ii) shaped by ram pressure of a distant wind source or sources located to the West, blowing ablated and photoevaporated material from their heads eastwards. The ripples in the tail of the Tadpole are interpreted in terms of instabilities at the interface between the ambient wind and the dense medium of the former.
Low-Latitude Mesosphere, Thermosphere, and Ionosphere
Y. Sahai,R. S. Dabas,Y. Otsuka,M. Klimenko
International Journal of Geophysics , 2012, DOI: 10.1155/2012/671240
Cutaneous Manifestations Of Neurofibromatosis Type 1 In South India
Jeevankumar B,Mohan Thappa Devinder,Narasimhan R,Sahai Ajit
Indian Journal of Dermatology , 2001,
Abstract: Neurofibromatosis type 1 (NF-1) is the most common form of neurofibromatosis. Since the significance of various cutaneous manifestations of NF-1 has not been known in Indian population, hence, the present study was undertaken. A total of 40 patients with NF-1 were identified between August 1998 to June 2000 with a prevalence rate of 20.4 per 10,000 individuals attending our clinic. Male to female ratio was 2.3: 1. The age of the patients ranged from 15 to 70 years with a mean age of 29.57 years. Most patients (18 cases) belonged to age group of 21-30 years followed by 11-20 years age group (11 cases). Twenty four cases had onset of disease between 11-20 years of age and ten cases in 21-30 years age group. Thirty one of 40 cases presented with asymptomatic nodules, three sought medical opinion for cosmetic reasons and another three for hyper pigmented patch. Analysis of cutaneous manifestations showed, 39 of 40 cases (97.5%) had neurofibromas. Palmar melanotic macules were noted in 36 (90%) cases whereas caf a€" au-lait macules were seen in 33(82.5%) cases. Subsequent, less common findings were intertriginous freckles in 31(77.5%) cases, plantar melanotic macules in 18(45%) cases and generalized freckles in 4(10%) cases. Statistical analysis of cases and controls revealed significant association of NF-1 with neurofibromas, palmar melanotic macules, caf -au-lait macules, intertriginous freckles and plantar melanotic macules(p<0.001). This study brings into focus some of the cutaneous manifestations noted in South Indian patients especially palmar and plantar melanotic macules, not highlighted in the western literature.
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