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Srivastava R.,SLP College | Srivastava R.,ABV Indian Institute of Information Technology and Management | Shrivastava S.,SLP College | Sharma U.S.,Rustamji Institute of Technology | Srivastava A.,ABV Indian Institute of Information Technology and Management
Advanced Science Letters | Year: 2015

We have analyzed the methane sensing ability of (10, 0) single walled carbon nanotube by using Generalized Gradient Approximation with Perdew, Burke and Ernzerhof type parameterization. The sensing of methane through nanotube has been analysed in terms of its band structure variation and conductance analysis. The analysis observes a semiconducting to metallic transition due to presence of methane molecule in surrounding of carbon nanotube and conductance changes drastically. In position based sensitivity analysis, the top surface has been found to be the most sensitive amongst different positions like top, bottom, bridge and tube ends. © 2015 American Scientific Publishers. All rights reserved. Source


Saraswat M.,Rustamji Institute of Technology
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2010

Ontologies are being progressively used to capture the semantics of information from various sources. They have wide area of usage ranging from artificial intelligence, natural language processing to web content and biology. This paper proposes the problem of finding similar objects that have been defined as a set of terms from an ontology. We consider tree-based ontologies where a node represents a term and an edge weight defines the distance or dissimilarity between corresponding terms. For object distance, Earth Mover's Distance (EMD) is used as it outperforms other distance measures like average and minimum pairwise distance. EMD, however is highly computationally intensive as it involves solution to linear programming (LP) problem. We propose an efficient lower bound on computing EMD by aggregating the terms in the ontology at the first level of the tree. This reduces the number of terms, thereby decreasing the number of flow variables and making it computationally faster. Range queries that use the lower bound runs faster by up to a factor of 20, as approximately 97% percentage of database objects are pruned, thereby saving expensive EMD calculations. © 2010 Springer-Verlag. Source


Srivastava A.,ABV Indian Institute of Information Technology and Management | Kaur K.,ABV Indian Institute of Information Technology and Management | Sharma R.,ABV Indian Institute of Information Technology and Management | Sharma R.,Rustamji Institute of Technology | And 4 more authors.
Journal of Electronic Materials | Year: 2014

The present paper discusses charge stability and conductance analyses of benzene- and zigzag graphene fragment-based single-electron transistors (SETs) operating in the Coulomb blockade regime. Graphene and benzene are modeled using density functional theory-based ab initio analyses, treating the interaction between graphene/benzene and the SET environment self-consistently. The devices consist of an oriented graphene/benzene island coupled with source and drain electrodes. The charging energy as a function of the external gate potential has been analyzed to verify the dependence of the charge stability and conductance of the oriented SETs on the source/drain bias and gate potential. Comparative analysis of these models shows that the SET with vertically oriented graphene is more stable and has better conductance in comparison with the benzene-based SET. © 2014 TMS. Source


Sharma U.S.,Rustamji Institute of Technology | Shah R.,Rustamji Institute of Technology | Pathak C.,Rustamji Institute of Technology | Sharma M.,Rustamji Institute of Technology
AIP Conference Proceedings | Year: 2013

In the present study, the electronic transport properties of single wall gallium nitride nanotubes (SWGaNNTs) were theoretically studied by using ab-initio calculations under density functional theory (DFT) with TranSIESTA code employing norm-conserving pseudopotential. The curvature has prominent effect on the band structure of SWGaNNTs, the energy bandgap decreases as the decrease the diameter. the calculated bandgap of (9,0) is 1.8126 eV are good experiment with the previous reported by theoretical studies. It is also observed that, there is a corresponding relation between the electronic transport properties and the valley of state density of GaNNT. © 2013 AIP Publishing LLC. Source

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