Time filter

Source Type

Das K.,Kalyani Government Engg College | Jana S.,Jadavpur University | Kundu P.K.,Jadavpur University
Alexandria Engineering Journal | Year: 2015

The present paper focuses on the analysis of thermophoretic hydromagnetic slip flow over a permeable flat plate with convective surface heat flux at the boundary and temperature dependent fluid properties in the presence of non-uniform heat source/sink. The transverse magnetic field is assumed to be a function of the distance from the origin. Also it is assumed that the liquid viscosity and the thermal conductivity vary as an inverse function and a linear function of temperature, respectively. The shooting method is employed to yield the numerical solutions for the model. Results show that the thermal boundary layer thickness reduces with increase of surface convection parameter whereas reverse effect occurs for viscosity parameter. It is also observed that the thermophoretic parameter decreases the concentration distribution across the boundary layer. © 2014 Elsevier B.V. All rights reserved. Source

Das S.,Nayagram Bani Bidyapith | Mandal S.N.,Kalyani Government Engg College | Ghoshal N.,Kalyani University
Advances in Intelligent Systems and Computing | Year: 2014

The security level of any symmetric key algorithm is directly proportional to its execution time. The algorithm will be more secured if the number of iteration is increase. Soft computing methods are trying to reduce time complexity without compromise the security level. In this paper, an image has been encrypted by number of steps. At first, a key set has been developed based on 16 arbitrary characters and a large number. The image has been diffused in the next step. The key set and diffused image have been computed by genetic algorithm. Here, ring crossover and order changing mutation operator is used in genetic algorithm. The encrypted image is constructed based on logical operation between the diffused image and key. The effectiveness of the algorithm has been tested by number of statistical tests. Finally, a comparative study has been made between our proposed algorithm and some other algorithms. It has been observed that the proposed algorithm has given better result. © Springer International Publishing Switzerland 2015. Source

Kanti Das B.,Calcutta Institute of Technology | Kumar Jha K.,Calcutta Institute of Technology | Sekhar Dutta H.,Kalyani Government Engg College
Proceedings - 2014 International Conference on Intelligent Computing Applications, ICICA 2014 | Year: 2014

The analysis of blood cells in microscope image can provide useful information concerning the health of the patient. To analyze, identify and diagnose - digital image processing techniques is much more effective than manual observation. The major intension of this paper is to detect the nucleus and cytoplasm of blood cells. The proposed work is useful to detect different kind of disease like anemia, leukemia etc on the basis of the condition of nucleus. This will also helpful for hematologists for clear identification and counting of blood cells. Finally the proposed work designed to obtain effective and more accurate result than other conventional edge detection techniques like Canny, Sobel, and Laplacian of a Gaussian. The result indicates 85% accuracy for identification of different type of cells as well as nucleus. © 2014 IEEE. Source

Das K.,Kalyani Government Engg College | Duari P.R.,Jadavpur University | Kundu P.K.,Jadavpur University
Alexandria Engineering Journal | Year: 2014

This paper investigates the unsteady boundary layer flow of a nanofluid over a heated stretching sheet with thermal radiation. The transport model employed includes the effects of Brownian motion and thermophoresis. The unsteadiness in the flow field is caused by the time-dependence of the stretching velocity, free stream velocity and the surface temperature. The unsteady boundary layer equations are transformed to a system of non-linear ordinary differential equations and solved numerically using a shooting method together with Runge-Kutta-Fehlberg scheme. The clear liquid results from this study are in agreement with the results reported in the literature. It is found that the heat transfer rate at the surface increases in the presence of Brownian motion but reverse effect occurs for thermophoresis. © 2014 Production and hosting by Elsevier B.V. Source

Saha S.,Jadavpur University | Saha S.,Kalyani Government Engg College | Raghavaiah P.,University of Hyderabad | Sinha C.,Jadavpur University
Polyhedron | Year: 2012

The reaction of HgX 2 (X = Cl, Br, I) with 1-alkyl-2-{(o- thioalkyl)phenylazo}imidazole (SRaaiNR′) in MeOH-ethyleneglycol mixture has synthesised [Hg(SRaaiNR′)X 2]. The structure of the products has been established by microanalytical and spectral (IR, UV-Vis, 1H NMR) data, and a distorted Td-geometry has been confirmed by a single crystal X-ray diffraction study of [Hg(SMeaaiNEt)I 2] (SMeaaiNEt = 1-ethyl-2-{(o-thiomethyl)phenylazo}imidazole). The UV light irradiation in CH 3CN solution of the complexes shows E-to-Z (E and Z refer to trans and cis-configurations) isomerisation of the coordinated SRaaiNR′ ligand about the -NN- bond. The rate of isomerisation follows: [Hg(SRaaiNR′) Cl 2] < [Hg(SRaaiNR′)Br 2] < [Hg(SRaaiNR′)I 2]. The quantum yields (φ E →Z) of the isomerisation of the complexes are lower than those of the free ligands. These may be due to increased mass and rotor volume of the complexes. The electronegativity sequence of X (I < Br < Cl) may regulate the molecular association and hence the effective mass of the rotor and the photoisomerisation rates. Thermal isomerisation determines the rate, activation energy (E a), activation enthalpy (Δ H) and activation entropy (Δ S) of the Z → E transformation of the coordinated SRaaiNR′. The E as of the thermal isomerisation of the complexes are lower than those of the free ligands. © 2012 Elsevier Ltd. All rights reserved. Source

Discover hidden collaborations