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Search Results: 1 - 10 of 411774 matches for " O. S. Choudhury "
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A case of leiomyosarcoma of kidney clinically and radiologically misdiagnosed as renal cell carcinoma
Choudhury M,Singh S,Pujani M,Pathania O
Indian Journal of Cancer , 2009,
The MUSE view of QSO PG1307+085: An elliptical galaxy on the $M_{BH}-σ_*$ relation interacting with its group environment
B. Husemann,V. N. Bennert,J. Scharw?chter,J. -H. Woo,O. S. Choudhury
Physics , 2015,
Abstract: We report deep optical integral-field spectroscopy with the MUSE of the luminous radio-quiet QSO PG1307+085 (z=0.154) obtained during the commissioning of the instrument. Given the high sensitivity and spatial resolution delivered by MUSE, we are able to resolve the compact ($r_e$~1.3") elliptical host galaxy. After careful spectroscopic deblending of the QSO and host galaxy emission, we infer a stellar velocity dispersion of $155\pm19$km/s. This places PG1307+085 local $M_{BH}-\sigma_*$ relation within the intrinsic scatter but offset towards a higher black hole mass with respect to the mean relation. The observations with MUSE also reveal a large extended ENLR around PG1307+085 reaching out to 30kpc. In addition, we detect a faint bridge of ionized gas towards the most massive galaxy of the galaxy group being just 20" (50kpc) away. Previous long-slit spectroscopic observations missed most of these extended features due to a miss-aligned slit. The ionized gas kinematics does not show any evidence for gas outflows on kpc scales despite the high QSO luminosity of $L_\mathrm{bol}>10^{46}$ erg/s. Based on the ionized gas distribution, kinematics and metallicity we discuss the origin of the ENLR with respect to its group environments including minor mergers, ram-pressure stripping or filamentary gas accretion as the most likely scenarios. We conclude that PG1307+085 is a normal elliptical host in terms of the scaling relations, but that the gas is most likely affected by the environment through gravity or ambient pressure. It is possible that the ongoing interaction with the environment, mainly seen in the ionized gas, is also be responsible for driving sufficient gas to feed the black hole at the centre of the galaxy.
A common unique fixed point theorem for two random operators in Hilbert spaces
Binayak S. Choudhury
International Journal of Mathematics and Mathematical Sciences , 2002, DOI: 10.1155/s0161171202005616
Abstract: We construct a sequence of measurable functions and consider its convergence to the unique common random fixed point of two random operators defined on a nonempty closed subset of a separable Hilbert space. The corresponding result in the nonrandom case is also obtained.
An iteration for finding a common random fixed point
Binayak S. Choudhury
International Journal of Stochastic Analysis , 2004, DOI: 10.1155/s1048953304208012
Abstract: We define a random iteration scheme and consider its convergence to a common random fixed point of two random operators defined on a convex subset of a separable Hilbert space. We also consider the case when the subset is further compact.
Note on modulational instability of Boussinesq wavetrains
S. Roy Choudhury
International Journal of Mathematics and Mathematical Sciences , 1992, DOI: 10.1155/s0161171292000516
Abstract: It is demonstrated that modulational instability may occur in Boussinesq wavetrains for wavenumbers k2>1, in contrast to the result found by Shivamoggi and Debnath. Both Whitham's averaged Lagrangian formulation and the technique of Benjamin and Feir are used.
Occupational exposure to sharps and splash: Risk among health care providers in three tertiary care hospitals in South India
Tetali S,Choudhury P
Indian Journal of Occupational and Environmental Medicine , 2006,
Abstract: Occupational exposure to blood and body fluids places Health care providers at risk of infection with blood borne viruses including HIV. To understand Health Care Providers′ (HCPFNx01) perception of risk of occupational exposure to needles, blood and body fluids, to find out the correlates of exposure and to identify groups of HCP at high risk of sustaining maximum number of such exposures. A cross sectional survey was conducted on HCP in three tertiary care hospitals in Kerala, between August 20th and October 30th, 2004 Chi square test, independent-sample T test and one-way ANOVA was used for analysis. Overall, 74.5% (95% CI 71.3 to 78.2) of the respondents were exposed at least once in the last 12 months. Surgeons were exposed most frequently, with a mean of 3.8 injuries per person per year. Injection needles were responsible for 68% of the injuries. Those who underwent the in-service training program on needle safety were less injured ( P =0.001). Only 4% of surgeons had undergone needle safety training. Almost half the surgeons, anesthetists and medical students did not know the reporting procedure and only 10% of anesthetists knew about the provision of Post Exposure Prophylaxis (PEP). A considerable proportion of respondents (85%) (95% CI- 81.2 to 88.5) were concerned about acquiring blood borne infections and 90% were immunized against Hepatitis B. Training of Health care providers is absolutely essential for injury reduction and should take into account the varying incidence of exposure across different occupation groups.
Convergence of a random iteration scheme to a random fixed point
Binayak S. Choudhury
International Journal of Stochastic Analysis , 1995, DOI: 10.1155/s104895339500013x
Abstract: This paper discusses the convergence of random Ishikawa iteration scheme to a random fixed point for a certain class of random operators.
Unique Fixed Point Theorem for Weakly C-Contractive Mappings
Binayak S Choudhury
Kathmandu University Journal of Science, Engineering and Technology , 2009, DOI: 10.3126/kuset.v5i1.2842
Abstract: In this work we introduce the class of weakly c-contractive mappings. We establish that these mappings necessarily have unique fixed points in complete metric spaces. We support our result by an example. Our result also generalises an existing result in metric spaces. Key words : Metric space; Fixed point; Weak C-contraction. M S C (2000): 54H25 ? DOI: 10.3126/kuset.v5i1.2842 Kathmandu University Journal of Science, Engineering and Technology Vol.5, No.1, January 2009, pp 6-13
Forward-Backward Asymmetry in $B\to X_d e^+e^-$
S. Rai Choudhury
Physics , 1997, DOI: 10.1103/PhysRevD.56.6028
Abstract: The Forward-backward asymmetry in the angular distribution of $e^+e^-$ is studied in the process $B\to e^+e^- and \bar{B}\to \bar{X}_d e^+e^-$ . The possibility of observing CP violation through the asymmetries in these two processes is examined.
Near room-temperature colossal magnetodielectricity and multiglass properties in partially-disordered La2NiMnO6
D. Choudhury,P. Mandal,R. Mathieu,A. Hazarika,S. Rajan,A. Sundaresan,U. V. Waghmare,R. Knut,O. Karis,P. Nordblad,D. D. Sarma
Physics , 2012, DOI: 10.1103/PhysRevLett.108.127201
Abstract: We report magnetic, dielectric and magnetodielectric responses of pure monoclinic bulk phase of partially-disordered La2NiMnO6, exhibiting a spectrum of unusual properties and establish that this system intrinsically is a true multiglass with a large magnetodielectric coupling (8-20%) over a wide range of temperatures (150 - 300 K). Specifically, our results establish a unique way to obtain colossal magnetodielectricity, independent of any striction effects, by engineering the asymmetric hopping contribution to the dielectric constant via the tuning of the relative spin orientations between neighboring magnetic ions in a transition metal oxide system. We discuss the role of anti-site (Ni-Mn) disorder in emergence of these unusual properties.
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