Seacom Engineering College

Hāora, India

Seacom Engineering College

Hāora, India
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Dutta S.,Behala College | Ghosh D.,Jadavpur University | Samanta S.,Seacom Engineering College | Dey S.,Tata Institute of Fundamental Research
Physica A: Statistical Mechanics and its Applications | Year: 2014

This paper presents a study on multifractal parameters of EEG patterns on the human brain. Multifractal detrended fluctuation analysis was applied to human EEG for normal and epileptic patients in different states. The results show that the degree of multifractality of EEG for patients in an epileptic seizure are much higher compared to normal healthy people. The degree of multifractality for normal humans with eyes open and closed was also significantly different. Thus the multifractal parameters can be used to distinguish between different physiological and pathological states of the human brain. The results are discussed in detail. © 2013 Elsevier B.V. All rights reserved.


Ghosh D.,Jadavpur University | Dutta S.,Behala College | Samanta S.,Seacom Engineering College
Acta Physica Polonica B | Year: 2012

The time series for gold price has been investigated in past and it was observed that the time series has multifractal properties. The gold price data from 1973 to the present time has been divided into sets of five years each and the variation of degree of multifractality with time is investigated. An attempt has been made to physically interpret the results and to make future predictions of variation in price.


Dutta S.,Behala College | Ghosh D.,Jadavpur University | Samanta S.,Seacom Engineering College
Physica A: Statistical Mechanics and its Applications | Year: 2014

This paper studies the variation of autocorrelation and cross correlation coefficients of gold price and SENSEX fluctuations with time. The paper uses MFDFA and MFDXA methodologies. SENSEX plays a more dominant role in the variation of cross correlations. It is observed that the cross correlation coefficients can be linked with the stability of the market. The market is most stable when the two series are most correlated. © 2014 Elsevier B.V. All rights reserved.


Khatua P.B.,Netaji Subhash Engineering College | Chakraborty S.,Seacom Engineering College | Debnath U.,Bengal Engineering and Science University
International Journal of Theoretical Physics | Year: 2012

In this work, we have considered dilaton dark energy model in Weyl-scaled induced gravitational theory in presence of barotropic fluid. It is to be noted that the dilaton field behaves as a quintessence. Here we have discussed the role of dilaton dark energy in modified gravity theories, namely f(R),f(T) and Hořava-Lifshitz gravities and analyzed the behavior of the dilaton field and the corresponding potential in respect to these modified gravity theories instead of Einstein's gravity. In f(R) and f(T) gravities, we have considered some particular forms of f(R) and f(T) and we have shown that the potentials always increase with the dilaton fields. But in Hořava-Lifshitz gravity, it has been seen that the potential always decreases as dilation field increases. © 2011 Springer Science+Business Media, LLC.


Chakraborty S.,Seacom Engineering College | Debnath U.,Bengal Engineering and Science University
International Journal of Theoretical Physics | Year: 2011

In this work, we have considered that the anisotropic universe is filled with normal matter and phantom field (or tachyonic field). We have chosen the exponential forms of scale factors a and b in such a way that there is no singularity for evolution of the anisotropic universe. Here we have shown that the emergent scenario is possible for open, closed or flat universe if the universe contains phantom field or tachyonic field or phantom tachyonic field. From recently developed statefinder parameters, the behaviour of different stages of the evolution of the emergent universe have been generated. © 2010 Springer Science+Business Media, LLC.


Chakraborty S.,Seacom Engineering College | Debnath U.,Bengal Engineering and Science University | Ranjit C.,Seacom Engineering College
European Physical Journal C | Year: 2012

We have considered the FRW universe in loop quantum cosmology (LQC) model filled with the dark matter (perfect fluid with negligible pressure) and the modified Chaplygin gas (MCG) type dark energy. We present the Hubble parameter in terms of the observable parameters Ω m0, Ω x0 and H 0 with the redshift z and the other parameters like A, B, C, and α. From the Stern data set (12 points), we have obtained the bounds of the arbitrary parameters by minimizing the χ 2 test. The best fit values of the parameters are obtained by 66 %, 90 % and 99 % confidence levels. Next due to joint analysis with BAO and CMB observations, we have also obtained the bounds of the parameters (B,C) by fixing some other parameters α and A. From the best fit of the distance modulus μ(z) for our theoretical MCG model in LQC, we concluded that our model is in agreement with the Union2 sample data. © 2012 Springer-Verlag / Società Italiana di Fisica.


Chakraborty S.,Seacom Engineering College | Debnath U.,Bengal Engineering and Science University
International Journal of Modern Physics A | Year: 2010

In this work, we consider the Universe is being filled with matter composed of a chameleon-type dark energy scalar field. Employing a particular form of potential, we discuss the field's role in the accelerating phase of the Universe for an anisotropic model using the logamediate and intermediate forms of scale factors. The natures of statefinder and slow-roll parameters are discussed diagrammatically. © 2010 World Scientific Publishing Company.


Chakraborty S.,Seacom Engineering College | Debnath U.,Bengal Engineering and Science University
Gravitation and Cosmology | Year: 2011

We consider anisotropic models of the Universe in the presence of a Brans-Dicke (BD) scalar field φ{symbol}, a causal viscous fluid and a barotropic fluid. We show that, irrespective of the fluid, the causality theory provides a late-time acceleration of the Universe. If deceleration occurs in a radial direction and acceleration in the transverse direction, then the anisotropic Universe will accelerate for a particular condition in a power-law representation of the scale factors. © 2011 Pleiades Publishing, Ltd.


Mahapatra G.S.,Siliguri Institute of Technology | Mahapatra B.S.,Seacom Engineering College
International Journal of Performability Engineering | Year: 2011

In this paper, redundancy allocation problem for system reliability has been presented with entropy as objective function. This model using entropy has been used to account for the lack of expert's information. The goal of entropy redundancy allocation problem is to find out optimal level of redundancies at each subsystem in a way that maximizes reliability and entropy of the system subject to specified system cost. Intuitionistic fuzzy optimization technique is used to analyze an entropy based reliability redundancy optimization problem. Numerical examples have been provided to illustrate the model. © RAMS Consultants.


Sarkar D.,Bengal Engineering and Science University | Naskar A.K.,Seacom Engineering College
International Journal of Electrical Power and Energy Systems | Year: 2013

Induction machines transient thermal analysis has been a subject of interest for machine designers in their effort to improve machine reliability. The stator being static is prone to high temperature. Therefore, the study of transient thermal behavior in the stator is useful to identify causes of failure in induction machines. The paper presents a two-dimensional transient heat flow in the stator of an induction motor using arch shaped elements in the r-θ plane of the cylindrical co-ordinate system. A temperature-time method is employed to evaluate the distribution of loss in various parts of the machine. Using these loss distributions as an input for finite element analysis, more accurate temperature distributions can be obtained. The model is applied to one squirrel cage Totally Enclosed Fan Cooled (TEFC) machine of 7.5 kW. Finally the temperatures obtained by this two-dimensional approximation at different location of stator have been compared for different stator currents considering the time required for each stator current during the transient in reactor starting. © 2012 Elsevier Ltd. All rights reserved.

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