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Yuan F.,Ningbo University | Rao J.,Ningbo University | Porsezian K.,Pondicherry UniversityPuducherry | Mihalache D.,Horia Hulubei National Institute of Physics and Nuclear Engineering | He J.,Ningbo University
Romanian Journal of Physics

A general explicit form of rational solutions for the Maccari’s system is given in terms of the Gram determinants by the bilinear method. It is shown that the fundamental rational solutions are made up of the lump and the simplest line rogue wave solutions. Under certain parametric conditions, the lumps can be classified into three patterns: bright, bimodal, and dark states. The fundamental rogue wave is called line rogue wave, because it arises from a constant background with a line profile and then disappears into the same background. The multi-rational solutions consist of either fundamental lumps or fundamental line rogue waves, or hybrid of lumps and line rogue waves. The multi-rational solutions also show that the multi-rogue waves describe the interaction of several fundamental rogue waves, which also arise from the constant background and then decay back to it. Moreover, higher-order rogue waves exhibit quite different patterns, such as bright, dark, and intermediate waveforms. © 2016, Editura Academiei Romane. All rights reserved. Source

Vendamani V.S.,University of Hyderabad | Vendamani V.S.,Pondicherry UniversityPuducherry | Pathak A.P.,University of Hyderabad | Nageswara Rao S.V.S.,University of Hyderabad
Optical Materials

Blue luminescent silicon nanoparticles (Si NPs) have been synthesized by using free standing porous silicon (FS-pSi) layer as a seed material. Transmission electron microscopy measurements confirm the generation of spherical nanoparticles with average size of about ∼5 nm. The crystalline nature of Si NPs was confirmed by selective area electron diffraction. The observed asymmetry and shift of Raman peaks with respect to bulk silicon further confirm the successful generation of Si NPs. The observed photoluminescence (PL) (at ∼447 nm) and the chromaticity diagram fall in the blue region. It matches with energy bandgap of SiNPs (∼2.85 eV) estimated by UV-VIS-NIR spectroscopy. This is an easy and versatile approach for generating high densities of Si NPs for possible use in micro and optoelectronic applications. © 2015 Elsevier B.V. All rights reserved. Source

Patil H.P.,Pondicherry UniversityPuducherry | Raja V.,Pondicherry UniversityPuducherry
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)

The purpose of this paper is to introduce the new family of H-graphs that generalizes the existing notions of trees, higher dimensional trees and k-ctrees. Further, we establish the characterizations of both the wheel-graphs G〈Wn〉 for n ≥ 6 and Tk-graphs for k ≥ 4, where Tk is not a star. Finally, we determine the conditions under which the Tk-graphs are split graphs and also propose some open problems for further research. © Springer International Publishing Switzerland 2016. Source

Anbazhagan R.,Pondicherry UniversityPuducherry | Rangaswamy N.,Pondicherry UniversityPuducherry
Advances in Intelligent Systems and Computing

In this paper, the contention performance of message- and code-based initial ranging is investigated for two different scenarios or cases when idle mode is activated at the mobile stations (MSs). First scenario assumes a chosen set of MSs to follow mobility waypoint between the base stations (BSs), while other MSs remain stationary. Second scenario (worst case) presumes that all the MSs served by the BSs follow either mobility waypoint or random waypoint between the BSs. Under these scenarios, during periodic location update, MSs undergo contentionbased network re-entry process. When more than one MSs undergo location update, it causes high contention amid MSs. Hence, this paper investigates the contention performance of message- and code-based ranging during periodic network re-entry. Simulations validate that the MSs in worst-case scenario with code ranging perform better in terms of idle-mode energy consumption (57.97%) and percentage of time in idle mode (68.11%) than message ranging under Rayleigh fading channel. © Springer India 2014. Source

Manivannan V.,Pondicherry UniversityPuducherry | Padmanaban R.,Pondicherry UniversityPuducherry
Chemical Physics

We investigate the initial state-selected dynamics of the title reaction on its ground (1 3A″) and first excited (1 3A′) triplet potential energy surfaces (PESs) by a time-dependent wavepacket propagation method, employing the ab initio analytical PESs developed by Gamallo et al. (2003). All partial wave contributions up to the total angular momentum J=140 are found to be necessary for the scattering of NO diatom in its vibrational and rotational ground state up to a collision energy ∼0.9 eV. The converged initial state-selected reaction attributes viz., reaction probabilities, integral cross sections and thermal rate constants are obtained within the centrifugal sudden (CS) approximation and the convergence of the results are carefully checked by varying all parameters used in the numerical calculations. The dynamical results are compared with the other reported theoretical and experimental findings. Investigation on the energy-resolved channel-specific reaction probabilities infers that the N2 formation channel is very much favorable than the N-exchange channel. The reaction proceeds via some metastable resonances, observed from the oscillatory probability curves, which is more in the latter channel compared to the former. The effect of rotational and vibrational excitations of the reagent (NO diatom) on the dynamics is examined. We also examine the effect of isotopic substitution of N-atom (14N by 15N) on the reaction dynamics. © 2016 Elsevier B.V. Source

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