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Search Results: 1 - 10 of 19975 matches for " U. Basu "
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Unsteady Incompressible Flow of a Generalised Oldroyed-B Fluid between Two Infinite Parallel Plates  [PDF]
D. Bose, U. Basu
World Journal of Mechanics (WJM) , 2013, DOI: 10.4236/wjm.2013.32012

This paper presents a study of visco-elastic flow of an incompressible generalized Oldroyd-B fluid between two infinite parallel plates in which the constitutive equation involves fractional order time derivative. The solutions of field equations are being obtained for the motion of the said fluid between two parallel plates where the lower plate starts to move with steady velocity and the upper plate remains fixed in the first problem and the upper plate oscillates with constant frequency and the other being at rest in the second problem. The exact solutions for the velocity field are obtained by using the Laplace transform and finite Fourier Sine transform technique in terms of Mittag Leffler and generalised functions. The analytical expression for the velocity fields are derived and the effect of fractional parameters upon the velocity field is depicted graphically.

Principle of objectivity and classical physics
M. Dutta,U. Basu
International Journal of Mathematics and Mathematical Sciences , 1979, DOI: 10.1155/s0161171279000132
Abstract: In literature, it is generally asserted that the “principle of objectivity ” is valid for constitutive equations but not valid for general field equations. In this paper, the principle of objectivity is formulated clearly to emphasize the correct significance, and necessity of the principle and to discuss its validity in physical theories. A discussion is made to show how successfully the principle of objectivity is also applicable to non-relativistic classical physics.
Observation on the foundation of kinetic theory of gases
U. Basu,M. Dutta
International Journal of Mathematics and Mathematical Sciences , 1982, DOI: 10.1155/s0161171282000556
Abstract: This paper deals with the study of the mathematical foundation of the Kinetic theory of gases. The significance of the Boltzmann model for a system of particles treated by classical mechanics is briefly explained. An apparent, but inherent difficulty in this model is pointed out.
Oblique interface-wave diffraction by a small bottom deformation in two superposed fluids
B. N. Mandal,U. Basu
International Journal of Mathematics and Mathematical Sciences , 1996, DOI: 10.1155/s0161171296000506
Abstract: The problem of diffraction of oblique interface-waves by a small bottom deformation of the lower fluid in two superposed fluids has been investigated here assuming linear theory and invoking a simplified perturbation analysis. First order corrections to the velocity potentials in the two fluids are obtained by using the Green's integral theorem in a suitable manner. The transmission and reflection coefficients are evaluated approximately. These reduce to the known results for a single fluid in the absence of the upper fluid.
A plane vertical submerged barrier in surface water waves
U. Basu,B. N. Mandal
International Journal of Mathematics and Mathematical Sciences , 1987, DOI: 10.1155/s0161171287000905
Abstract: By a simple application of Green's integral theorem, amplitude of the radiated waves at infinity due to a line source in the presence of a fixed vertical plane barrier completely submerged in deep water is obtained.
Self-organised criticality in stochastic sandpiles: Connection to directed percolation
U. Basu,P. K. Mohanty
Physics , 2014, DOI: 10.1209/0295-5075/108/60002
Abstract: We introduce a stochastic sandpile model where finite drive and dissipation are coupled to the activity field. The absorbing phase transition here, as expected, belongs to the directed percolation (DP) universality class. We focus on the small drive and dissipation limit, i.e. the so-called self-organised critical (SOC) regime and show that the system exhibits a crossover from ordinary DP scaling to a dissipation-controlled scaling which is independent of the underlying dynamics or spatial dimension. The new scaling regime continues all the way to the zero bulk drive limit suggesting that the corresponding SOC behaviour is only DP, modified by the dissipation-controlled scaling. We demonstrate this for the continuous and discrete Manna model driven by noise and bulk dissipation.
A Protease Isolated from the Latex of Plumeria rubra Linn (Apocynaceae) 2: Anti-inflammatory and Wound- Healing Activities
I Chanda, U Sarma, SK Basu, M Lahkar, SK Dutta
Tropical Journal of Pharmaceutical Research , 2011,
Abstract: Purpose: The aim of this study was to investigate the anti-inflammatory and wound-healing activities of the protease isolated from the latex of Plumeria rubra Linn. Methods: The protease was isolated from the latex of the plant by acetone precipitation method and given a trivial name, Plumerin-R. The anti-inflammatory activity of the protease was based on its effects on carrageenan-induced paw oedema in rats. Its wound healing effect was investigated using an excision wound rat model. Results: Four hours after treatment, the reduction in carrageenan-induced rat paw oedema by 20, 40 and 80 mg/kg body weight of plumerin-R was 21.6, 33.8 and 48.8 %, respectively, while oedema reduction by indomethacin (10 mg/kg) was 58.0 %. Plumerin-R showed significant (p < 0.05) wound closure and epithelialization time compared with control. Conclusion: This study demonstrates that the protease, Plumerin-R, has significant anti-inflammatory and wound-healing properties.
Tabu Search Implementation on Traveling Salesman Problem and Its Variations: A Literature Survey  [PDF]
Sumanta Basu
American Journal of Operations Research (AJOR) , 2012, DOI: 10.4236/ajor.2012.22019
Abstract: The Traveling Salesman Problem (TSP) and its allied problems like Vehicle Routing Problem (VRP) are one of the most widely studied problems in combinatorial optimization. It has long been known to be NP-hard and hence research on developing algorithms for the TSP has focused on approximate methods in addition to exact methods. Tabu search is one of the most widely applied metaheuristic for solving the TSP. In this paper, we review the tabu search literature on the TSP and its variations, point out trends in it, and bring out some interesting research gaps in this literature.
Kinetics of Osmotic Concentration of Carrot Preserve
U.S. Shivhare,M. Gupta,S. Basu,G.S.V. Raghavan
Journal of Food Technology , 2013,
Abstract: Carrot is one of the important vegetable grown throughout the world. It is a rich source of - carotene, a precursor of vitamin A. Carrot is consumed as raw and cooked as well as used for the manufacture of juice, preserve and pickles. The present study was undertaken to manufacture carrot preserve in (i) sucrose syrup (70o Brix), (ii) syrup of 70o Brix prepared using 50:50 sucrose and glucose, and (iii) glucose syrup of 51o Brix, respectively at 25oC. Carrots were peeled, cut to approximately 7 cm length, blanched in boiling water for 0.5 h and transferred immediately into sterilized glass jars containing the syrup. The carrot to syrup ratio was held at 1:4. Two batches of each were prepared. In one of the batch, the TSS of syrup was held constant (i.e. 70o Brix or 51o Brix); while in the other, the TSS of the syrup was not regulated. Kinetics of loss of moisture, ascorbic acid, -carotene, uptake of sugars, TSS, and texture of the product was experimentally determined. In addition, sensory evaluation of the product was also carried out. A mathematical model similar to the Page s equation described adequately the temporal variation of moisture, ascorbic acid, -carotene, uptake of sugars and TSS of carrot during preserve manufacture. Results of the kinetic parameters and sensory scores indicated that carrots should be osmosed in syrup (70o Brix, constant) containing 50:50 glucose and sucrose.
Serological cross reactivity between Glomerella cingulata and Camellia sinensis
Indian Phytopathology , 2012,
Abstract: Pathogenicity of G/omerella cingulata (Stoneman) Spauld and Schrenk, causal agent of brown blight disease, tested under identical conditions following detached leaf and cut shoot inoculation techniques against fourteen varieties of tea [Camellia sinensis (L.) a.Kuntze] revealed that CP-1 and TV-26 were resistant, while TV-18 and Teen Ali-17/1/54 were susceptible. Polyclonal antisera were raised separately against antigen preparations from mycelia and cell wall of G. cingulata (isolate Gc-1), mycelia of F. oxysporum and leaf antigens of TV-18 and CP-1. Cross reactive antigen (CRA) were found among the susceptible varieties of tea and isolates of G. cingulata (Gc- 1, 2 and 3). Such antigens were not detected between resistant varieties of tea and isolates of G. cingulata (Gc-1, Gc-2 & Gc-3 ); non-pathogen (Fusarium oxysporum) and tea varieties; isolates of G. cingulata and F. oxysporum and between non-host (Glycine max, Cicer arietinum and Camellia japonicum) and G. cingulata. Antisera raised against cell wall preparations gave better recognition than that against mycelial preparations as observed in ELISA test with antigens of tea leaves of different ages.
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