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Search Results: 1 - 10 of 423345 matches for " S. K. Sahu "
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Low Density Instability in Asymmetric Nuclear Matter Using Pion Dressing  [PDF]
S. K. Sahu
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.69140
Abstract: We study the asymmetric nuclear matter in a nonperturbative manner. The bulk nuclear matter studied by the consistent exchange of σ, ω and π mesons is used to investigate its stability. The equation of state (EOS) at zero temperature is considered to study the symmetry energy, curvature parameter of symmetry energy and asymmetry energy. The effect of the density dependence of the symmetry energy on instability property is investigated and analyzed using proton fraction in the nuclear matter. Here a microscopic density-dependent model of the nucleon-meson coupling is used to reexamine the instability of asymmetric nuclear matter.
Effect of magnetic field on the strange star
S. Chakrabarty,P. K. Sahu
Physics , 1995, DOI: 10.1103/PhysRevD.53.4687
Abstract: We study the effect of a magnetic field on the strage quark matter and apply to strange star. We found that the strange star becomes more compact in presence of strong magnetic field.
Measurement of Radiation Damage on Silica Aerogel \v Cerenkov Radiator
S. K. Sahu et al
Physics , 1996, DOI: 10.1016/S0168-9002(96)00768-1
Abstract: We measured the radiation damage on silica aerogel \v Cerenkov radiators originally developed for the $B$-factory experiment at KEK. Refractive index of the aerogel samples ranged from 1.012 to 1.028. The samples were irradiated up to 9.8~MRad of equivalent dose. Measurements of transmittance and refractive index were carried out and these samples were found to be radiation hard. Deteriorations in transparency and changes of refractive index were observed to be less than 1.3\% and 0.001 at 90\% confidence level, respectively. Prospects of using aerogels under high-radiation environment are discussed.
Fluoride Uptake and Net Primary Productivity of Selected Crops  [PDF]
P. C. Mishra, S. K. Sahu, A. K. Bhoi, S. C. Mohapatra
Open Journal of Soil Science (OJSS) , 2014, DOI: 10.4236/ojss.2014.411039
Abstract: Crop field soil collected from Sambalpur University campus of Odisha and treated with various fluoride concentrations was used to raise selected local crops. Background concentration of total and leachable fluoride content in soil was 95.19 and 8.89 ppm respectively. At the time of harvest of the crops, the total fluoride content was found to decrease and leachable fluoride content was found to increase both in control and experimental sets. This might be due to the addition of fluoride to soil in the experimental set up as well as availability of background fluoride content in soil and the irrigated water (i.e. 0.5 ppm). The fluoride accumulation in plant tissue increased with increase in the fluoride content in soil. Net Primary Productivity (NPP) of fluoride treated plants decreased in Brinjal by 6.64% - 56.72%, Tomato by 14.46% - 62.24% and Mung by 10.27% - 53.61%, all in 20 - 100 ppm fluoride range. However, NPP of Mustard, Ladies finger and Chili decreased by 15.58% - 61.21%, 12.28% - 52.78% and 40.8% - 90.65% in 10 - 50 ppm fluoride treated sets respectively in 10 - 50 ppm fluoride range. Maize NPP decreased by 12.17% - 61.20% in 20 - 100 ppm fluoride range as Rice NPP decreased by 6.64% - 56.72% in 20 - 100 ppm fluoride range. Pod formation was inhibited at 100 ppm fluoride amended soil in case of Mung, and 50 ppm in Ladies finger, 40 - 100 ppm in Maize and 30 - 50 ppm fluoride amended soil in case of Chilli. Thus, Maize and Chilli are more sensitive to fluoride contamination than other crops. In all the crops NPP decreased with increase in fluoride content in soil with significant decrease in highest concentration of fluoride.
Method Development and validation of oseltamivir phosphate in bulk drug by UV spectroscopy
A. Chourasia,S. Acharya,S. k. Sahu
International Journal of Pharmaceutical and Biological Research , 2011,
Abstract: The present research work discussed the development of a simple, sensitive, rapid, accurate, precise and economical UV Spectrophotometric method for the Validation of Oseltamivir Phosphate in bulk and pharmaceutical dosage form which is based on the measurement of absorption maxima at 217 nm. Double beam U.V visible spectrophotometers, Shimadzu, Kyoto, Japan. Model UV1800 with 1cm matched quartz cells and de-ionized water as solvent were used. Developed methods obeyed the Beer’s law in the concentration range of16 to 24μg/ml having line equation y = 0.015x + 0.251 with correlation coefficient of 0.999. Method was validated statistically. Percentage recovery of the drug for the proposed method ranged from (98.76%) indicating no interference of the excipients. The developed method was validated with respect to linearity, precision, accuracy (recovery), limit of detection (LOD) and limit of quantitation (LOQ).
Numerical Range of Two Operators in Semi-Inner Product Spaces
N. K. Sahu,C. Nahak,S. Nanda
Abstract and Applied Analysis , 2012, DOI: 10.1155/2012/846396
Abstract: In this paper, the numerical range for two operators (both linear and nonlinear) havebeen studied in semi-inner product spaces. The inclusion relations between numericalrange, approximate point spectrum, compression spectrum, eigenspectrum, and spectrumhave been established for two linear operators. We also show the inclusion relation betweenapproximate point spectrum and closure of the numerical range for two nonlinearoperators. An approximation method for solving the operator equation involving twononlinear operators is also established.
Transient free convection MHD flow between two long vertical parallel porous plates with variable temperature and mass diffusion
U. S. Rajput,P. K. Sahu
Journal of Engineering and Applied Sciences , 2011,
Abstract: The unsteady MHD transient free convection flow of an incompressible viscous electrically conducting fluid between two infinite vertical parallel porous plates with Variable temperature and mass diffusion has been considered, under the assumption that the induced magnetic field is negligible. Applied magnetic field is fixed relative to the fluid and plates. The Laplace transform method has been used to find the solutions for the velocity, temperature and concentration profiles. The velocity, temperature and concentration profiles have been studied for different parameters like Prandtl number, Schmidt number, magnetic parameter, buoyancy ratio parameter, permeability parameter and time. The value of the skin-friction for different parameters has been tabulated.
Dielectric Investigation of Doped Poly (methyl acrylate) (PMA) Conducting Polymer Films
Vikram S. Yadav,Devendra K. Sahu
Lecture Notes in Engineering and Computer Science , 2011,
Abstract:
Quality Control Studies of Mesua ferrea Linn. Flowers
Sahu Alakh N,Hemalatha S,Sairam K
International Journal of Herbal Medicine , 2013,
Abstract: Mesua ferrea Linn. belonging to the family Clusiaceae (alternatively Guttiferea). The flowers were fragrant, cream coloured, ebracteate, pedicellate, pedicel short, axillary, solitary or in pairs (cluster) and 2.5-7.5 cm in diameter, bisexual and buds were sub-globose. The transverse section showed numerous multicellular and multiseriate type trichomes on the upper layer of the epidermis. Foreign organic matter (0.47% w/w), total ash (6.30% w/w), acid insoluble ash (2.30 % w/w), water soluble ash (2.31 % w/w), alcohol soluble extractive (20.53 % w/w), water soluble extractive (10.26 % w/w), loss on drying (9.88 %), foaming index (333.3), swelling index (0.53 ml) and volatile oil (0.20 % v/w) of the crude drug were been obtained. A fingerprint of fluorescence was obtained. Chlorinated pesticide in first and second elute from column were 0.030 and 0.013 respectively and phosphated pesticides in first elute was 0.028 mg/kg of crude drug. Preliminary phytochemical screening showed the presence of many phytochemicals.
Numerical Methods for Solving Fredholm Integral Equations of Second Kind
S. Saha Ray,P. K. Sahu
Abstract and Applied Analysis , 2013, DOI: 10.1155/2013/426916
Abstract: Integral equation has been one of the essential tools for various areas of applied mathematics. In this paper, we review different numerical methods for solving both linear and nonlinear Fredholm integral equations of second kind. The goal is to categorize the selected methods and assess their accuracy and efficiency. We discuss challenges faced by researchers in this field, and we emphasize the importance of interdisciplinary effort for advancing the study on numerical methods for solving integral equations. 1. Introduction Integral equations occur naturally in many fields of science and engineering [1]. A computational approach to solve integral equation is an essential work in scientific research. Integral equation is encountered in a variety of applications in many fields including continuum mechanics, potential theory, geophysics, electricity and magnetism, kinetic theory of gases, hereditary phenomena in physics and biology, renewal theory, quantum mechanics, radiation, optimization, optimal control systems, communication theory, mathematical economics, population genetics, queuing theory, medicine, mathematical problems of radiative equilibrium, the particle transport problems of astrophysics and reactor theory, acoustics, fluid mechanics, steady state heat conduction, fracture mechanics, and radiative heat transfer problems. Fredholm integral equation is one of the most important integral equations. Integral equations can be viewed as equations which are results of transformation of points in a given vector spaces of integrable functions by the use of certain specific integral operators to points in the same space. If, in particular, one is concerned with function spaces spanned by polynomials for which the kernel of the corresponding transforming integral operator is separable being comprised of polynomial functions only, then several approximate methods of solution of integral equations can be developed. A computational approach to solving integral equation is an essential work in scientific research. Some methods for solving second kind Fredholm integral equation are available in the open literature. The B-spline wavelet method, the method of moments based on B-spline wavelets by Maleknejad and Sahlan [2], and variational iteration method (VIM) by He [3–5] have been applied to solve second kind Fredholm linear integral equations. The learned researchers Maleknejad et al. proposed some numerical methods for solving linear Fredholm integral equations system of second kind using Rationalized Haar functions method, Block-Pulse functions, and
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