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Identification of Preferable Distributed Generators Locations for Congestion Relief in Multi-Bus Power Network

Energy and Power Engineering 2014年第7期6卷 161-173页

作者： barnali k. sarkar Abhijit Chak.abarti Abhinandan De Department of Electrical Engineering Indian Institutes of Engineering Science and Technology Shibpur India Jadavpur University Kolkata India

Installation of Distributed Generator (DG) is a well accepted method to improve power system operation from the point of reducing congestion and improving voltage profiles. For best results, Distributed Generators should be placed at strategic locations to exploit maximum benefits out of them. The (N-1) contingency criterion has been tak.n into account in this work. Most congested lines of the grids are rank.d by congestion Index and considered to study the impact of DG penetration on congestion. The present paper proposes contribution factors of Distributed Generators for the placement of DG to k.ep the line flow within the capacity of each transmission line of the network. The results obtained from IEEE 30-bus test system indicate that the proposed methods are capable of identifying desirable DG location and its maximum allowable size. The influence of DG on bus voltage profile has also been demonstrated in this paper.

关键词： Distributed Generators Congestion Index Contribution Factor of DG Voltage Sensitivity Zone Classification

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Nick.l Decorated Single-Wall Carbon Nanotube as CO Sensor

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Soft Nanoscience Letters 2013年第4期3卷 9-11页

作者： Ngangbam Bedamani Singh barnali Bhattacharya Utpal sarkar Department of Physics Assam University Silchar Assam.

Based on spin-polarized density functional theory (DFT) calculations, the interaction between nick.l cluster decorated single-wall carbon nanotube (CNT) and CO molecule has been investigated. DFT calculations are performed with generalized gradient approximation (GGA) using Perdew-Burk.-Ernzerhof (PBE) functional. Interaction of CNT and cluster induces spin polarization in the CNT. Nick.l decorated CNT has a large magnetic moment of 4.00 μB which decreases to 0.10 μB when CO molecule is absorbed to it. Such a drastic reduction in magnetization may be detected by SQUID magnetometer. Hence by measuring magnetization change, CNT-cluster system may be used as gas detectors. The charge transfer between the systems has been discussed through Mullik.n charge analysis for different orientations of the adsorbed CO molecule. We observed that CNT-cluster system acts as electron donor and CO molecule acts as electron acceptor in this study.

关键词： Nick.l Cluster Carbon Nanotube CO Sensor DFT Magnetic Moment

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Interaction of Boron-Nitrogen Substitued Graphene Nanoribbon with Nucleobases: The Idea of Biosensor

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Soft Nanoscience Letters 2013年第4期3卷 43-45页

作者： barnali Bhattacharya Ngangbam Bedamani Singh Utpal sarkar Department of Physics Assam University Silchar India.

In this paper we have designed a biosensor device built from B-N substituted graphene nanoribbon within density functional based tight-binding (DFTB) framework. We have investigated the interaction of the nucleobases adenine (A), Guanine (G), Cytosine (C) and Thymine (T) with device. Our calculation suggests that all the nucleobases have different interaction strength when they interact with device and shows that guanine has stronger interaction with device than other nucleobases. It reveals that the absorption energy shows the hierarchy: G > C > T > A. Our results also demonstrate the transport properties of the device and how the transport properties change due to the absorption of nucleobases on the device.

关键词： Biosensor DFTB Nucleobases Transport Properties Nanoribbon

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