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Search Results: 1 - 10 of 376330 matches for " P. C. Mishra "
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Freeze-out volume of hot dense fireball
Mishra, M.;Singh, C. P.
High Energy Physics - Phenomenology , 2007, DOI: 10.1016/j.physletb.2007.06.014
Abstract: A thermodynamically consistent excluded volume model is proposed to account for the particle multiplicities obtained from lowest SIS energies to the highest RHIC energies. The chemical freeze-out volumes lying in a slice of one unit of rapidity for pions and kaons are separately inferred from this analysis and the results are compared with the corresponding thermal freeze-out volumes obtained from the Hanbury-Brown Twiss (HBT) pion interferometry. Furthermore, we extract the variations of freeze-out number densities for pions and nucleons with the center-of-mass energy in our model and compare them with the HBT data.
Effect of geometrical size of the particles in a hot and dense hadron gas
Mishra, M.;Singh, C. P.
High Energy Physics - Phenomenology , 2007, DOI: 10.1103/PhysRevC.76.024908
Abstract: Incorporation of the finite size of baryons into the equation of state (EOS) of a hot and dense hadron gas (HG) in a thermodynamically consistent manner has been a much studied problem. We first review its current status. Various models have been proposed in order to account for the repulsive force generated by the hard-core geometrical size of the baryons resulting in an excluded volume effect in the EOS. We examine the criterion of the thermodynamical consistency of these models and summarize their shortcomings. In order to remove the shortcomings, we propose a new model which incorporates the excluded volume effect in a thermodynamically consistent manner. We find that the new model works even for the cases of extremely large temperatures and densities where most of other approaches fail. Furthermore, the new expressions for thermodynamical variables resemble in form with those obtained from thermodynamically inconsistent models and thus a useful correction factor has been suggested here which converts inconsistent expressions into thermodynamically consistent ones. Finally we compare the predictions of new model with those obtained from various old models.
On the chemical freeze-out criteria in a hot and dense fireball
Mishra, M.;Singh, C. P.
High Energy Physics - Phenomenology , 2007,
Abstract: Intensive investigations of freeze-out criteria in a hot and dense fireball provide important information regarding particle emission from the fireball. A systematic comparison of these proposals is presented here in the framework of a thermodynamically consistent excluded volume model which has been found to describe the properties of hadron gas (HG) quite well. We find that the impact of excluded volume correction is considerably large and the average energy per hadron is 0.9 GeV, $n_b+n_{\bar b}$ stays nearly constant at 0.12/fm$^3$ and the normalized entropy density $s/T^3\approx 6$ in this model. Moreover, these values are independent of the beam or center-of-mass energy and also of the target and beam nuclei. In ideal HG model these quantities show substantial energy dependence. Further we have compared the predictions of various excluded volume models in the precise determination of these criteria and we find that the thermodynamically consistent excluded volume models give the best results. In addition, we find another important criterion that entropy per hadron has a constant value at 6 in our model. We hope that these findings will throw considerable light on the expansion dynamics and the bulk thermodynamic properties of the fireball before chemical freeze-out.
Supplementation of Vitamin E and C Reduces Oxidative Stress in Broiler Breeder Hens during Summer  [PDF]
B. P. Jena, N. Panda, R. C. Patra, P. K. Mishra, N. C. Behura, B. Panigrahi
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.48A004
Abstract: The present experiment was carried out to evaluate the effects of vitamin E and C supplementation on the antioxidant status of broiler breeder hens during summer. Two hundred seventy broiler breeder birds (coloured) were divided into nine groups with three replicates having 10 birds in each, and were supplemented two levels of antioxidant vitamins E (250 mg or 500 mg/kg) or C (200 mg or 400 mg/kg) alone or in combinations for a period of 8 weeks. All the vitamin supplemented groups showed significantly lowered malondialdehyde (MDA) level, higher activities of superoxide dismutase (SOD), catalase (CAT) enzymes and higher Ferric Reducing Antioxidant Power (FRAP) activities in erythrocytes than control. However, supplementation with combination of vitamins proved to be better than individual supplementation. It could be concluded that the combination of vitamins C and E at lower level (@ 200 mg/kg and 250 mg/kg, respectively) had higher erythrocytic antioxidant status in coloured broiler breeder hens as compared to individual vitamin supplementation during hot and humid stress.
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.
Effect of Radial Expansion of Cr-Mo Steel Tubes on Their Corrosion Behavior in Sea Water  [PDF]
A. C. Seibi, P. Rostron, A. Elramady, B. Mishra, O. Al Nazer, S. Al Ameri
Materials Sciences and Applications (MSA) , 2012, DOI: 10.4236/msa.2012.39084
Abstract: This paper studies the effect of expansion ratio on the corrosion rate of the expanded tubes exposed to sea water as well as the microstructure changes caused by the expansion of Cr-Mo steel tubes to large permanent deformations. 2.25 Cr-1.0 Mo steel (schedule 40 and schedule 80) tubes were subjected to various expansion ratios of 10%, 15%, 20%, and 25% by pushing conical mandrels through them using a piston. The microstructure was also studied to determine the effect of the expansion on the grain structure of the material. Microscopic examination of the expanded tubes revealed that grains elongate along the direction of the hoop stress and this elongation increases with an increase of expansion ratio. Moreover, it was found that corrosion rate and hardness increase with an increase in expansion ratio.
Construction of Ru(II) Polypyridyl Based Macrocycles: Synthesis, Characterization, Electrochemical, Li+ Binding, Antitumour and Anti-HIV properties
Lallan Mishra,Ragini Sinha,P. C. Pandey
Metal-Based Drugs , 2001, DOI: 10.1155/mbd.2001.113
Abstract:
$ρ$ - meson spectral function in hot nuclear matter
P. C. Raje Bhageerathi,Amruta Mishra
Physics , 2010, DOI: 10.1142/S0218301312500632
Abstract: We study the $\rho$-meson spectral function in hot nuclear matter by taking into account the isospin-symmetric pion and the nucleon loops within the quantum hadrodynamics (QHD) model as well as using an effective chiral SU(3) model. The spectral function of the $\rho$ meson is studied in the mean field approximation (MFA) as well as in the relativistic Hartree (RHA) approximation. The inclusion of the nucleon loop considerably changes the $\rho$-meson spectral function. Due to a larger mass drop of $ \rho $ meson in the RHA, it is seen that the spectral function shifts towards the low invariant mass region, whereas in the MFA the spectral function is seen to be slightly shifted towards the high mass region. Moreover, while the spectral function is observed to be sharper with the nucleon-antinucleon polarization in RHA, the spectral function is seen to be broader in the MFA.
Electrostatic Potential as a Descriptor of Anti-Bacterial Activities of Some Anacardic Acid Derivatives: A Study Using Density Functional Theory
Manish K. Tiwari,P. C. Mishra
Physics , 2015,
Abstract: Structures and minimum molecular electrostatic potential (MEP) distributions in anacardic acid and some of its derivatives have been studied by full geometry optimization at the M06-2X/6-31G(d,p), WB97XD/6-31G(d,p) and B3LYP/6-31G(d,p) levels of density functional theory (DFT) in gas phase as well as in DMSO and aqueous solutions. Solvent effect was treated employing the integral equation formalism of the polarizable continuum model. Effects of modifications of the C1-side chain on the minimum MEP values in various regions were studied. Minimum MEP values near the oxygen atoms of the C2-OH group, oxygen or sulfur atoms of the C1-attached urea or thiourea groups and above or below the ring plane considered to be involved in interaction with the receptor were used to perform multiple linear regression. Experimentally observed anti-bacterial activities of these molecules against S. aureus are thus shown to be related to minimum MEP values in the above mentioned regions. Among the three DFT functionals used in the study, the M06-2X functional is found to yield most reliable results. Anti-bacterial activities have been predicted for certain molecules of the class which need to be verified experimentally.
Computational Efficiency of Optimized Shortest Path Algorithms.
P. Biswas,P. K. Mishra,N. C. Mahanti
International Journal of Computer Science & Applications , 2005,
Abstract:
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