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Sarker J.,Techno India | Goswami S.K.,Jadavpur University
International Journal of Electrical Power and Energy Systems | Year: 2016

The increased use of nonlinear loads in distribution system is increasing the distortion in the voltage and current waveforms. Moreover, the distribution systems are inherently unbalanced. This paper presents Cuckoo Optimization Algorithm (COA) based Unified Power Quality Conditioner (UPQC) allocation in three phase unbalanced distribution network. The performance of UPQC is studied in terms of minimization of load disturbance during fault condition in the test systems, % reduction of total harmonic distortion and individual harmonics, minimization of real power loss, decrease in voltage unbalance and increase in cost savings during normal operating condition. The performance of COA is compared with other soft computing techniques to get the better results, i.e., better voltage profile, the optimal location and optimal number of UPQCs. © 2016 Elsevier Ltd. All rights reserved.

Kumar A.,Indian Institute of Technology Jodhpur | Adhikari S.,Indian Institute of Technology Jodhpur | Banerjee S.,Indian Institute of Technology Jodhpur | Roy S.,Techno India
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2013

We propose a three-qubit partially entangled set of states as a shared resource for optimal and faithful quantum information processing. We show that our states always violate the Svetlichny inequality, which is a Bell-type inequality whose violation is a sufficient condition for the confirmation of genuine three-qubit nonlocality. Although our states can be physically realized from the generalized Greenberger-Horne-Zeilinger (GGHZ) states using a simple quantum circuit, the nonlocal properties of the set are quite different from the GGHZ states. Instead, they are similar to the maximal slice (MS) states, even though our states are not locally equivalent to the MS states. Unlike other two- and three-qubit partially entangled states, quantum teleportation using our states results in faithful transmission of information with unit probability and unit fidelity by performing only standard measurements for the sender, controller, and receiver. We further demonstrate that dense coding also leads to the deterministic transfer of a maximum number of bits from the sender to the receiver. We also introduce witness operators able to experimentally detect the family of states introduced. This work highlights the importance of both the local as well as nonlocal aspects of quantum correlations in multiqubit systems. © 2013 American Physical Society.

Sarkar S.,Techno India | Ghosh N.,University of Calcutta | Bhattacharya K.,University of Calcutta
Applied Optics | Year: 2012

A polarization phase shifting interferometer using a cyclic path configuration for measurement of phase nonuniformities in transparent samples is presented. A cube beam splitter masked by two linear polarizers is used to split the source wavefront into two counter propagating linearly polarized beams that pass through the sample. At the output of the interferometer, the two orthogonally polarized beams are rendered circularly polarized in the opposite sense through the use of a quarter wave plate. Finally, phase shifting is achieved by rotating a linear polarizer before the recording plane. In a rectangular path interferometer, although the two counter propagating wavefronts are laterally folded with respect to each other in the interferometer arms, the beams finally emerge mutually unfolded at the output of the interferometer. This phenomenon is utilized to create a reference if the sample is introduced in one lateral half of the beam in any one of the interferometer arms. The polarization phase shifting technique is used to generate four phase-shifted interferograms, which are utilized to evaluate the phase profile of the phase sample. Experimental results presented validate the proposed technique. © 2011 Optical Society of America.

Lahiri S.,Dinabandhu Mahavidyalaya Bongaon | Roychowdhury D.,Techno India | Sekar Iyengar A.N.,Saha Institute of Nuclear Physics
Physics of Plasmas | Year: 2012

Long range temporal correlations in the fluctuations of the plasma floating potentials (measured using a Langmuir probe) are investigated in a dc glow discharge plasma. Keeping the neutral pressure constant, the discharge voltage was varied and at the formation of the plasma, quasi periodic oscillations were excited and on further increase of the discharge voltage they became chaotic (irregular) beyond a threshold voltage. We compared the Lyapunov exponent with the Hurst exponent obtained from R/S statistics which showed an opposite behaviour at the transition point. These results are perhaps new since we have not come across such comparative analysis for chaotic oscillations in a glow discharge plasma before. © 2012 American Institute of Physics.

Chakrabarty S.,Techno India | De D.,Maulana Abul Kalam Azad University of Technology
2012 International Conference on Radar, Communication and Computing, ICRCC 2012 | Year: 2012

Pattern recognition in rhythm of Tabla instrument in ICM (Indian Classical Music) is very complex task that is the combination of speech, audio, and their signal processing techniques. In this paper we proposed a system that identify the basic source rhythm and then modify the rhythm to improve the quality of source rhythm by using Genetic Algorithm. In simple terms, rhythm is a word that refers to the length of each note in a piece of music, the combination of beats. In order to develop high quality of rhythm in an efficient manner, it is essential to identify the correct sequence of the different PRAKAR of Tabla rhythm like, THEKA, UTHAN, TUKADA, RELA, LAGGI, KAIDA, TIHAI, CHAKRADAR, etc. PRAKAR means different sorts of rhythmic compositions used in Tabla. The focus of this study is to explore the efficiency of Genetic Algorithm to search for an optimum combination of rhythm to improve the Music Quality Metric. © 2012 IEEE.

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