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Search Results: 1 - 10 of 8879 matches for " Ranjan Sharma "
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Collapse of a Relativistic Self-Gravitating Star with Radial Heat Flux: Impact of Anisotropic Stresses
Ranjan Sharma,Shyam Das
Journal of Gravity , 2013, DOI: 10.1155/2013/659605
Abstract: We develop a simple model for a self-gravitating spherically symmetric relativistic star which begins to collapse from an initially static configuration by dissipating energy in the form of radial heat flow. We utilize the model to show how local anisotropy affects the collapse rate and thermal behavior of gravitationally evolving systems. 1. Introduction In cosmology and astrophysics, there exist many outstanding issues relating to a dynamical system collapsing under the influence of its own gravity. In view of Cosmic Censorship Conjecture, the general relativistic prediction is that such a collapse must terminate into a space-time singularity covered under its event horizon though there are several counter examples where it has been shown that a naked singularity is more likely to be formed (see [1] and references therein). In astrophysics, the end stage of a massive collapsing star has long been very much speculative in nature [1, 2]. From classical gravity perspective, to get a proper understanding of the nature of collapse and physical behavior of a collapsing system, construction of a realistic model of the collapsing system is necessary. This, however, turns out to be a difficult task because of the highly nonlinear nature of the governing field equations. To reduce the complexity, various simplifying methods are often adopted and the pioneering work of Oppenheimer and Snyder [3] was a first step in this direction when collapse of a highly idealized spherically symmetric dust cloud was studied. Since then, various attempts have been made to develop realistic models of gravitationally collapsing systems to understand the nature and properties of collapsing objects. It got a tremendous impetus when Vaidya [4] presented a solution describing the exterior gravitational field of a stellar body with outgoing radiation and Santos [5] formulated the junction conditions joining the interior space time of the collapsing object to the Vaidya exterior metric [4]. These developments have enabled many investigators to construct realistic models of gravitationally evolving systems and also to analyze critically relevance of various factors such as shear, density inhomogeneity, local anisotropy, electromagnetic field, viscosity, and so forth, on the physical behaviour of collapsing bodies [6–52]. In the absence of any established theory governing gravitational collapse, such investigations have been found to be very useful to get a proper understanding about systems undergoing gravitational collapse. The aim of the present work is to develop a simple model of a
Test Cost Optimization Using Tabu Search  [PDF]
Anu Sharma, Arpita Jadhav, Praveen Ranjan Srivastava, Renu Goyal
Journal of Software Engineering and Applications (JSEA) , 2010, DOI: 10.4236/jsea.2010.35054
Abstract: In order to deliver a complete reliable software product, testing is performed. As testing phase carries on, cost of testing process increases and it directly affects the overall project cost. Many a times it happens that the actual cost becomes more than the estimated cost. Cost is considered as the most important parameter with respect to software testing, in software industry. In recent year’s researchers have done a variety of work in the area of Cost optimization by using various concepts like Genetic Algorithm, simulated annealing and Automation in generation of test data etc. This paper proposes an efficient cost effective approach for optimizing the cost of testing using Tabu Search (TS), which will provide maximum code coverage along with the concepts of Dijkstra’s Algorithm which will be implemented in Aspiration criteria of Tabu Search in order to optimize the cost and generate a minimum cost path with maximum coverage.
Relativistic stellar model admitting a quadratic equation of state
Ranjan Sharma,B. S. Ratanpal
Physics , 2013, DOI: 10.1142/S0218271813500740
Abstract: A class of solutions describing the interior of a static spherically symmetric compact anisotropic star is reported. The analytic solution has been obtained by utilizing the Finch and Skea ({\it Class. Quant. Grav.} {\bf 6} (1989) 467) ansatz for the metric potential $g_{rr}$ which has a clear geometric interpretation for the associated background space-time. Based on physical grounds appropriate bounds on the model parameters have been obtained and it has been shown that the model admits an equation of state (EOS) which is quadratic in nature.
Evaluation of WHO Diagnostic Algorithm for Reproductive Tract Infections among Married Women
Ranjan Roochika,Sharma AK,Mehta Geeta
Indian Journal of Community Medicine , 2003,
Lumbar nerve root hernia: An unusual complication of micro-endoscopic discectomy
Sharma Pankaj,Ranjan Alok,Lath Rahul
Neurology India , 2011,
Assessment of the Impact of Industrial Effluents on Groundwater Quality in Okhla Industrial Area, New Delhi, India
Wequar Ahmad Siddiqui,Rajiv Ranjan Sharma
Journal of Chemistry , 2009, DOI: 10.1155/2009/525707
A class of interior solutions corresponding to a $(2+1)$ dimensional asymptotically anti-de Sitter spacetime
Ranjan Sharma,Farook Rahaman,Indrani Karar
Physics , 2011, DOI: 10.1016/j.physletb.2011.08.054
Abstract: Lower dimensional gravity has the potential of providing non-trivial and valuable insight into some of the conceptual issues arising in four dimensional relativistic gravitational analysis. The asymptotically anti-de Sitter (2+1) dimensional spacetime described by Ba$\tilde{n}$ados, Teitelboim and Zanelli (BTZ) which admits a black hole solution, has become a source of fascination for theoretical physicists in recent years. By suitably choosing the form of the mass function $m(r)$, we derive a new class of solutions for the interior of an isotropic star corresponding to the exterior (2+1) asymptotically anti-de Sitter BTZ spacetime. The solution obtained satisfies all the regularity conditions and its simple analytical form helps us to study the physical parameters of the configuration in a simple manner.
Prevalence of Dry Eye and Its Association with Various Risk Factors in Rural Setup of Western Uttar Pradesh in a Tertiary Care Hospital  [PDF]
Ravi Ranjan, Sushil Kumar Shukla, Chandra Veer Singh, B. N. Mishra, Sriti Sinha, B. D. Sharma
Open Journal of Preventive Medicine (OJPM) , 2016, DOI: 10.4236/ojpm.2016.61005
Abstract: Purpose: To study the prevalence of dry eye in a hospital based population of rural setup and to evaluate its association with various risk factors. Material and Methods: In this cross sectional study, patients above 20 years of age were screened randomly for dry eye. An 8 points questionnaires, slit lamp examination of meibomian glands, tear film breakup time, fluorescein staining of cornea, schirmer test were used to diagnose dry eye. The diagnosis was made when three of the five parameters were positive. The role of various occupations as well as role of different exposure factors like sunlight, excessive wind, smoking, drugs, and air pollution as dry eye risk factors was accessed. Result: Out of 445, 45.39% patients had dry eye. Dry eye prevalence was higher in those above 70 years of age (74%). It was higher in male population (51.82%) compare to female population (37.37%), nearly equal in rural (46.04%) and urban population (44.31%) and highest among factory workers (90%). Correlation of dry eye with drugs (P = 0.0002), sunlight/high temperature (P = 0.0003) and smoking (P = 0.03) were significant. Conclusion: This is a hospital based study which provides prevalence of dry eye in rural region of western Uttar Pradesh. It is more common in old age male population and significantly higher in factory workers. Out of different modifiable risk factors most important are drugs, sunlight/high temperature and smoking.
Chauhan Neelam,Bairwa Ranjan,Sharma Komal,Chauhan Nootan
International Research Journal of Pharmacy , 2011,
Abstract: Cassia fistula Linn. (Leguminoseae), commonly known as the Golden Shower, Indian Laburnum. Cassia fistula trees as leguminous plants are popularly grown in Thailand. It is native to India, the Amazon and Sri Lanka and diffused in various countries including Mexico, China, Mauritius, South Africa, East Africa, and West Indies. The antibacterial activities of the petroleum ether, chloroform, ethyle acetate, methanolic and 50% (v/v) hydro alcoholic successive extracts of Cassia fistula (L) fruits were studied. The extracts of Cassia fistula were tested in vitro against 4 bacterial species by the disc diffusion method. Staphylococcus aureus, Streptococcus epidermidis, Escherchia coli and Klebsiella Pneumoniae were used in this investigation. Only methanolic extract exhibited fair antibacterial activity against all the test bacteria whereas other extract were not observed to inhibit the growth of any of the test bacteria under study. Aragvadha (Cassia fistula Linn.) is a well known, commonly used plant in various disorders in Ayurvedic system of medicine. In traditional medicine, it is used in the treatment of hematemesis, pruritis, intestinal disorders, leucoderma, diabetes, & as antipyretic, analgesic & laxative.
Comparative efficacy of intralesional sodium stibogluconate (SSG) alone and its combination with intramuscular SSG to treat localized cutaneous leishmaniasis: Results of a pilot study
Negi Ajeet,Sharma Nand,Mahajan Vikram,Ranjan Nitin
Indian Journal of Dermatology, Venereology and Leprology , 2007,
Abstract: Background: Intralesional sodium stibogluconate (SSG) has become first line therapy for localized cutaneous leishmaniasis (LCL). Aims: This study compares the efficacy of intralesional SSG given alone with that of intralesional SSG combined with intramuscular SSG. Methods: Thirty-two patients aged between 5-56 years were included in the study. The first group received three injections of intralesional SSG on alternate days while the other group received three injections of intralesional SSG similar to the first group and the rest of the calculated dose as a simultaneous, intramuscular injection. Patients were followed up every four weeks to assess for cure/ the need for repeating the treatment. Results: Five patients from group 1 having small nodular lesions of < six months duration were cured after 1-2 treatment cycles. However, six patients with mucosal lesions, large lesions and lesions of > six months duration needed 3-5 treatment schedules. Most plaques and mucosal lesions in seven patients in group 2 cleared with two treatment cycles. Conclusion: Intralesional combined with intramuscular SSG appears more effective in LCL and gave qualitatively superior healing than intralesional SSG given alone
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