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Parnasree Pally, India

Rahaman F.,Jadavpur University | Kuhfittig P.K.F.,Milwaukee School of Engineering | Bhui B.C.,Meghnad Saha Institute of Technology | Rahaman M.,Meghnad Saha Institute of Technology | Mondal U.F.,Behala College
Physical Review D - Particles, Fields, Gravitation and Cosmology | Year: 2013

In this paper, a Bañados-Teitelboim-Zanelli (BTZ) black hole is constructed from an exact solution of the Einstein field equations in a (2+1) - dimensional anti - de Sitter spacetime in the context of noncommutative geometry. The BTZ black hole turns out to have either two horizons, no horizon, or a single horizon corresponding to a minimal mass. Certain thermodynamical properties are investigated, including Hawking temperature, entropy, and heat capacity. Also discussed is the geodesic structure of BTZ black holes for both massless and massive particles. In particular, it is shown that bound orbits for test particles are possible. © 2013 American Physical Society. Source

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. Source

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. Source

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. Source

Saha R.,Jadavpur University | Dey S.K.,Jadavpur University | Biswas S.,Jadavpur University | Jana A.D.,Behala College | Kumar S.,Jadavpur University
Crystal Growth and Design | Year: 2013

The nonlinear optical active chiral complex 1 [{Co(2,5-pdc)(H 2O)2}H2O]n (2,5-pdc = 2,5-pyridine dicarboxylate) has been synthesized via a solvothermal technique using the achiral 2,5-pdc ligand. Complex 1 (phase 1), a two-dimensional coordination polymer, undergoes crystalline to amorphous (phase 2) transformation upon deaquation, which under reaquation generates a new microcrystalline phase (phase 3). The crystal structure of phase 3 has been determined by powder X-ray diffraction analysis (PXRD), which reveals that the resultant microcrystalline phase 3 is an achiral complex consisting of one-dimensional coordination chains. Phase 3 undergoes reversible structural transformation via amorphous phase (phase 2) upon dehydration and subsequent rehydration. This amorphous phase shows selective adsorption of water from a water-DMF mixture and water-CCl 4 mixture. Phase 1 to phase 3 structural transformation proceeds through selective bond breaking. The magnetic studies of the two crystalline and the amorphous phase reveal that phase 1 behaves as a canted antiferromagnet, while both amorphous phase 2 and phase 3 show antiferromagnetism. © 2013 American Chemical Society. Source

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