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Search Results: 1 - 10 of 298236 matches for " J. Satish "
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LRS Bianchi Type-I Inflationary String Cosmological Model in Brans-Dicke Theory of Gravitation
R. Venkateswarlu,J. Satish
Journal of Gravity , 2014, DOI: 10.1155/2014/909374
Abstract: We investigate locally rotational symmetric (LRS) Bianchi type I space time coupled with scalar field. String cosmological models generated by a cloud of strings with particles attached to them are studied in the Brans-Dicke theory. We assume that the expansion scalar is proportional to the shear scalar and also power law ansatz for scalar field. The physical behavior of the resulting model is discussed through different parameters. 1. Introduction It is believed that the early universe evolved through some phase transitions, thereby yielding a vacuum energy density which at present is at least 118 orders of magnitudes smaller than in the Planck time [1]. Such a discrepancy between theoretical expectations and empirical observations constitutes a fundamental problem in the interface uniting astrophysics, particle physics, and cosmology. The recent observational evidence for an accelerated state of the present universe, obtained from distant SNe Ia (Perlmutter et al. [2]; Riess et al. [3]), gave strong support to search for alternative cosmologies. Thus, the state of affairs has stimulated the interest in more general models containing an extra component describing dark energy and simultaneously accounting for the present accelerated stage of the universe. The isotropic models are considered to be the most suitable to study large scale structure of the universe. However, it is believed that the early universe may not have been exactly uniform. This prediction motivates us to describe the early stages of the universe with the models having anisotropic background. Thus, it would be worthwhile to explore anisotropic models in the context of modified theories of gravity. Among the various modifications of general relativity (GR), the Brans-Dicke (BD) theory of gravity [4] is a well-known example of a scalar tensor theory in which the gravitational interaction involves a scalar field and the metric tensor. One extra parameter is used in this theory which satisfies the equation given by where is known as BD scalar field while is the trace of the matter energy-momentum tensor. It is mentioned here that the general relativity is recovered in the limiting case . Thus we can compare our results with experimental tests for significantly large value of . The majority of popular cosmological models, including all the ones referred to above, use the cosmological principle; that is, they assume that the universe is homogeneous and isotropic. On the other hand, there are hints in the CMB temperature anisotropy studies that suggest that the assumption of statistical
Live Video Services Using Fast Broadcasting Scheme  [PDF]
Satish Chand
Communications and Network (CN) , 2010, DOI: 10.4236/cn.2010.21013
Abstract: The Fast Broadcasting scheme is one of the simplest schemes that provide video services. In this scheme, the video is divided into equal-sized segments depending upon the bandwidth allocated by the video server. If the video length is not known, then this scheme cannot be applied as the number of video segments cannot be determined. In a live video wherein the video size is unknown, especially the ending time of the live broadcast, e.g., cricket match, this scheme cannot be applied. In this paper, we propose a model that helps the Fast Broadcasting scheme to support live video broadcasting. The basic architecture of the system consists of a live system with one video channel that broadcasts the live video and a video server that broadcasts the already broadcast live video to users.
Effect of Particulate Reinforcement on the Mechanical Properties of Al2024-WC MMCs  [PDF]
K. Punith Gowda, J. N. Prakash, Shivashankare Gowda, B. Satish Babu
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2015, DOI: 10.4236/jmmce.2015.36049
Abstract: The present work reveals the study of mechanical properties of Al2024-Tungsten carbide MMCs containing tungsten carbide (WC) particulates. The reinforcing particulates in the Al2024 alloy were varied from 0% to 5% by weight. The vortex method of cast production was employed to fabricate the MMCs, in which the reinforcement was poured into the vortex created by stirring the molten metal by means of a mechanical agitator. The composite so produced was subjected to a series of mechanical tests. The results of this study revealed that as the tungsten carbide particle content was increased, there were significant increases in the ultimate tensile strength, hardness and young’s modulus, compressive strength, accompanied by a reduction in its ductility. An attempt is made in the paper to provide explanations for these phenomena.
DEVELOPMENT AND VALIDATION OF VISIBLE SPECTROPHOTOMETRIC METHOD FOR ESTIMATION OF AMOXYCILLIN TRIHYDRATE IN PHARMACEUTICAL DOSAGE FORM
Patel Satish A,Patel Natavarlal J.
International Research Journal of Pharmacy , 2011,
Abstract: A simple, sensitive, accurate, precise and economical visible spectrophotometric method was developed and validated for the estimation of amoxycillin trihydrate in tablets. The method is based on the reaction of amoxycillin trihydrate with ninhydrin reagent in methanol giving blue color chromogen, which shows maximum absorbance at 578 nm against reagent blank. The chromogen obeyed Beer’s law in the concentration range of 10-80 μg/ml for amoxycillin trihydrate. The results of the analysis have been validated statistically and by recovery studies.
VISIBLE SPECTROPHOTOMETRIC METHOD FOR ESTIMATION OF CEFADROXIL IN TABLET DOSAGE FORM
Patel Satish A,Patel Natavarlal J.
International Research Journal of Pharmacy , 2011,
Abstract: A simple, sensitive, accurate, precise and economical visible spectrophotometric method was developed and validated for the estimation of cefadroxil in tablets. The method is based on the reaction of cefadroxil with ninhydrin reagent in methanol giving blue color chromogen, which shows maximum absorbance at 578 nm against reagent blank. The chromogen obeyed Beer’s law in the concentration range of 5-50 μg/ml for cefadroxil. The results of the analysis have been validated statistically and by recovery studies.
VALIDATED SPECTROPHOTOMETRIC METHODS FOR THE DETERMINATION OF CARVEDILOL IN TABLETS
Patel Satish A,Patel Natavarlal J.
International Research Journal of Pharmacy , 2011,
Abstract: Three simple, sensitive, precise and economical UV- spectrophotometric methods have been developed for the determination of Carvedilol in tablet formulation. Method A is simple UV spectrophotometric method and is based on determination of carvedilol in 0.1 N HCl at 241.2 nm. Linearity was obtained in the concentration range of 1 – 12 μg/ml. Method B is first order derivative spectrophotometric method and involved estimation of carvedilol in 0.1 N HCl usingt the first- order derivative technique at 251 nm as maxima and 290.8 nm as minima. Calibration curve was prepared by plotting the absorbance difference between maxima and minima versus concentration. Linearity was obtained in the concentration range of 2- 20 μg/ml. Method C is area under curve (AUC) method. The method involved calculation of integrated value of absorbance with respect to the wavelength between two selected wavelength 246 nm and 228.6 nm, respectively. Linearity was obtained in the concentration range of 2- 20 μg/ml. These methods were successfully applied to pharmaceutical formulations because no interferences from tablet excipients were found. The suitability of these methods for the quantitative determination of cavedilol was proved by validation. The proposed methods were found to be simple, sensitive, accurate, precise, rapid and economical for the routine quality control application in pharmaceutical formulations.
DEVELOPMENT AND VALIDATION OF DUAL WAVELENGTH SPECTROPHOTOMETRIC METHOD FOR SIMULTANEOUS ESTIMATION OF CEFIXIME TRIHYDRATE AND OFLOXACIN IN TABLET DOSAGE FORM
Patel Satish A,Patel Natavarlal J.
International Research Journal of Pharmacy , 2011,
Abstract: The present manuscript describe simple, sensitive, rapid, accurate, precise and economic dual wavelength spectrophotometric method was developed for the simultaneous determination of cefixime trihydrate (CEFI) and ofloxacin (OFLO) in combined tablet dosage form. The utility of dual wavelength data processing program is its ability to calculate unknown concentration of components of interest in a mixture containing an interfering component. The principle for dual wavelength method is “the absorbance difference between two points on the mixture spectra is directly proportional to the concentration of the component of interest”. The method was based on determination of ofloxacin at 350 nm using its absorptivity value and cefixime at 264 nm after deduction of absorbance due to ofloxacin. The two drugs follow Beer-Lanbert’s law over the concentration range of 2-14 μg/ml. The method was successfully applied to pharmaceutical dosage form because no interference from the tablet excipients was found. The results of analysis have been validated statistically and by recovery studies.
SPECTROPHOTOMETRIC DETERMINATION OF CEPHALEXIN USING NINHYDRIN REAGENT IN TABLET DOSAGE FORM
Patel Satish A,Patel Natavarlal J.
International Research Journal of Pharmacy , 2011,
Abstract: A simple, sensitive, accurate, precise and economical visible spectrophotometric method was developed and validated for the estimation of cephalexin in tablets. The method is based on the reaction of cephalexin with ninhydrin reagent in methanol giving blue color chromogen, which shows maximum absorbance at 576 nm against reagent blank. The chromogen obeyed Beer’s law in the concentration range of 5-60 μg/ml for cephalexin. The results of the analysis have been validated statistically and by recovery studies.
Release Kinetic Determination of Once a Day Prolong Release Tablets of Pramipexole Dihydrochloride Using Model-Dependent Approaches
Manish J. Chauhan,Dr. Satish A. Patel
International Journal For Pharmaceutical Research Scholars , 2013,
Abstract: The aim of presented research work was to determine release kinetic pattern of Pramipexole dihydrochloride prolong release tablets using model dependent approaches. Various release kinetic models like Zero order, First order, Higuchi, Korsmeymer-Peppas, Hixson–Crowell and Weibull were applied to developed prolonged release tablet of Pramipexole dihydrochloride. The criteria for selecting the most appropriate model was lowest sum of square of residuals. Residual values between predicted and observed data were used to calculate the sum of squares of residuals. Lowest sum of square of residuals indicate the minimum variance between the predicted and observed dissolution data. The entire release profile was compared by taking the absolute difference (residual) between the predicted and observed calculated AUC data.
SIMULTANEOUS SPECTROPHOTOMETRIC DETERMINATION OF MONTELUKAST SODIUM AND BAMBUTEROL HYDROCHLORIDE IN TABLETS
Patel Satish A,Patel Dhara J,Patel Natavarlal J.
International Research Journal of Pharmacy , 2011,
Abstract: The present manuscript describe simple, sensitive, rapid, accurate, precise and economical first derivative spectrophotometric method for the simultaneous determination of montelukast sodium and bambuterol hydrochloride in combined tablet dosage form. The derivative spectrophotometric method was based on the determination of both the drugs at their respective zero crossing point (ZCP). The first order derivative spectra was obtained in chloroform and the determinations were made at 241 nm (ZCP of bambuterol hydrochloride) for montelukast sodium and 258.4 nm (ZCP of montelukast sodium) for bambuterol hydrochloride. The linearity was obtained in the concentration range of 10-60 μg/ml for montelukast sodium and 10-80 μg/ml for bambuterol hydrochloride. The mean recovery was 100.1 ± 1.25 and 99.70 ± 1.38 for montelukast sodium and bambuterol hydrochloride, respectively. The method was found to be simple, sensitive, accurate and precise and was applicable for the simultaneous determination of montelukast sodium and bambuterol hydrochloride in pharmaceutical tablet dosage form. The results of analysis have been validated statistically and by recovery studies.
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