Vv Vanniaperumal College For Women

Virudhunagar, India

Vv Vanniaperumal College For Women

Virudhunagar, India

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Devamani R.H.P.,Vv Vanniaperumal College For Women | Alagar M.,Ayya Nadar Janaki Ammal College
Nano Biomedicine and Engineering | Year: 2013

Copper (II) Hydroxide nano particles were synthesized via chemical co-precipitation method from Copper Sulphate and Sodium Hydroxide. Structural and compositional properties were characterized by XRD, SEM, FTIR and UV spectroscopy. XRD confirmed the preferential growth of Copper (II) Hydroxide nano particles that width is 33.42nm. The SEM image shows the synthesized Copper (II) Hydroxide show well crystallized particles with plate-like morphology. The FTIR spectrum is used to study the stretching and bending frequencies of molecular functional groups in the sample. From UV spectrum, the band gap of Copper (II) hydroxide nano particles is found to be 4.5 eV. From AAS studies, it is found that the absorbance is directly proportional to the concentration. The linear fit indicates that Copper (II) Hydroxide nanoparticles have been distributed in proper proportion. Copyright:(c) 2013 R H. P. Devamani and M Alagar.


Parvathi A.A.,VV Vanniaperumal College for Women | Peter A.J.,Government Arts and Science College | Yoo C.K.,Kyung Hee University
Chinese Physics Letters | Year: 2013

Exciton binding energy, interband emission energy, oscillator strength, and some nonlinear optical properties in quantum dots made up of polar semiconductors are computed with the geometrical confinement. The effects of the interaction of charge carriers with the longitudinal optical phonons on the exciton binding energy are included. The anisotropy of the effective masses of holes is incorporated throughout the calculations. Nonlinear optical exciton absorption of II - VI systems based on some polar semiconductors in the presence of LO phonons is discussed. The optical rectification coefficient associated with the intersubband transitions in a quantum dot of polar semiconductors is investigated. Changes of refractive index with the photon energy in a polar quantum dot are found. Our results show that the polar bound excitons in II - VI based polar semiconductors depend on the geometrical confinement, and the nonlinear optical properties strongly depend on the polar materials. © 2013 Chinese Physical Society and IOP Publishing Ltd.


Parvathi A.A.,VV Vanniaperumal College for Women | Peter A.J.,Government Arts and Science College | Yoo C.K.,Kyung Hee University
Journal of Computational and Theoretical Nanoscience | Year: 2014

Cadmium doped zinc oxide powders with different concentrations of cadmium are prepared by wet chemical method. The electronic transitions are investigated by UV transmission spectra and compared with the interband emission energy computed theoretically. The exciton binding energy in the wurtzite strained CdxZn1-xO/ZnO quantum dot, grown along 〈0001〉 polar direction, is computed considering the internal electric field induced by the spontaneous and piezoelectric polarizations. Numerical calculations are carried out using single band effective mass approximation with the variational scheme to compute the exciton binding energy and the optical transition energry. Geometrical effects on optical properties of strained CdxZn 1-xO/ZnO quantum dots are discussed. The nonlinear optical properties are obtained using the compact density matrix approach. The linear, third order non-linear optical absorption coefficients, susceptibility values and the refractive index changes with the photon energy are obtained. Our numerical results are in good agreement with the experimental results. Copyright © 2014 American Scientific Publishers All rights reserved.


PubMed | Vv Vanniaperumal College For Women, Director of Research and Conservation and Islamiah College Autonomous
Type: | Journal: Ecotoxicology and environmental safety | Year: 2015

Ascidians belonging to the sub-phylum Uro-chordata are used as potential model organisms in various parts of the world for biosorption of metals. The sedentary nature, filter feeding habits, presence of vanadocytes and the absence of kidneys cause them to accumulate metals. The present study was aimed to compare biosorption of metals such as cadmium, copper, lead, mercury and vanadium in test and mantle body of solitary ascidian Phallusia nigra between two ecologically significant stations such as Thoothukudi (Station 1) and Vizhinjam (Station 2) ports of India. Monthly samplings of water and P. nigra were done for a period of one year from September 2010 to August 2011 and subjected to analysis of metal accumulation. The average metal concentrations except mercury in the Thoothukudi water were found to be higher of comparable magnitudes than the Vizhinjam water. One-way ANOVA showed significant differences between the stations. A comparison of average metal concentrations in the test and mantle body of P. nigra between two stations showed that the enrichment of V, Cd, Pb, Cu and Hg in the Thoothukudi samples may be due to high bioaccumulation factors of these elements as compared to other species of ascidians. The bioaccumulation factors were in the order of V>Pb>Cd>Cu> Hg for the test and mantle body in stations 1 and 2. Application of one-way ANOVA for the concentration of these metals between test and mantle body showed significant differences in both stations. Similarly, ANOVA for biosorption of these trace metals by P. nigra showed significant difference between stations. Metal concentrations recorded in this ascidian could effectively be used as good reference material for monitoring metal contamination in Indian sea waters.


Azhagu Parvathi A.,VV Vanniaperumal College for Women | Mathan Kumar K.,Syed Ammal Engineering College | John Peter A.,P.A. College
Journal of Optoelectronics and Advanced Materials | Year: 2015

Effects of longitudinal optical phonon field on the ground state and low lying-excited state energies of a hydrogenic impurity in a Zn1-xCdxSe/ZnSe strained quantum dot are investigated for various Cd content using the Aldrich-Bajaj effective potential. We consider the strain effect considering the internal electric field induced by the spontaneous and piezoelectric polarizations. Calculations have been performed using Bessel function as an orthonormal basis for different confinement potentials of barrier height. Polaron induced photoionization cross section of the hydrogenic impurity in the quantum dot is investigated. We study the oscillator strengths, the linear and third-order nonlinear optical absorption coefficients and the changes of refractive index as a function of incident photon energy for 1s-1p and 1p-1d transitions with and without the polaronic effect. It is observed that the potential taking into account the effects of phonon induces the binding energy more than the obtained results using a Coulomb potential screened by a static dielectric constant and the optical properties of hydrogenic impurity in a quantum dot are strongly affected by the confining potential and the radii. It is also observed that the magnitude of the absorption coefficients increases for the transitions between higher levels with the inclusion of phonon effect.


Azhagu Parvathi A.,VV Vanniaperumal College for Women | Mathan Kumar K.,Syed Ammal Engineering College | John Peter A.,P.A. College
Journal of Optoelectronics and Advanced Materials | Year: 2015

Effects of longitudinal optical phonon field on the ground state and low lying-excited state energies of a hydrogenic impurity in a Zn1-xCdxSe/ZnSe strained quantum dot are investigated for various Cd content using the Aldrich-Bajaj effective potential. We consider the strain effect considering the internal electric field induced by the spontaneous and piezoelectric polarizations. Calculations have been performed using Bessel function as an orthonormal basis for different confinement potentials of barrier height. Polaron induced photoionization cross section of the hydrogenic impurity in the quantum dot is investigated. We study the oscillator strengths, the linear and third-order nonlinear optical absorption coefficients and the changes of refractive index as a function of incident photon energy for 1s-1p and 1p-1d transitions with and without the polaronic effect. It is observed that the potential taking into account the effects of phonon induces the binding energy more than the obtained results using a Coulomb potential screened by a static dielectric constant and the optical properties of hydrogenic impurity in a quantum dot are strongly affected by the confining potential and the radii. It is also observed that the magnitude of the absorption coefficients increases for the transitions between higher levels with the inclusion of phonon effect.


Sumathi M.,Sri Meenakshi Government College for Women | Barani R.,Vv Vanniaperumal College For Women
International Conference on Pattern Recognition, Informatics and Medical Engineering, PRIME 2012 | Year: 2012

Image fusion is the process of combining information from two or more images of a same scene into a single composite image that is more informative and is more suitable for visual perception or computer processing. The main objective of this paper is to implement the various pixel level fusion algorithms and to determine how well the information contained in the source images are represented in the fused images on multimodality and multifocusing images. Experiments and qualitative metrics dictate that Laplacian Pyramid method performs better on both multimodality and multifocusing images. © 2012 IEEE.


Jothi R.B.G.,Vv Vanniaperumal College For Women | Rani S.M.M.,Vv Vanniaperumal College For Women
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2013

Graph Neural Network based on edges is introduced in this paper and is used to recognize the English uppercase alphabets treating their corresponding graphs as semigraphs. Graph Neural Network(GNN) is a connectionist model comprising of two feedforward neural networks (FNN) called transition network and output network connected by recurrent architecture according to the graph topology. The characteristics of the edges in a graph are considered as input for the transition network and the stabilized output of the transition network are taken as input for the output network. Edge based GNN is trained using error gradient method. Experimental results show that GNN is able to identify all the 26 graphs of alphabets correctly. © 2013 Springer International Publishing.


Gnana Jothi R.B.,Vv Vanniaperumal College For Women | Meena Rani S.M.,Vv Vanniaperumal College For Women
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

Graph structured data are classified by connectionist models such as Graph neural network (GNN), recursive neural network. These models are based on the label of the nodes of the graph. An attempt has been made to consider the network based on edges. If a graph structured data is represented as semigraph, the number of edges will be reduced leading to a reduction in the number of networks in GNN. In this paper uppercase English alphabets represented as graphs are recognized using edge based hybrid neural network by viewing the graphs as semigraph. Experimental results show that the edge based hybrid neural network is able to identify all the graphs of alphabets correctly and outperforms edge based GNN. © Springer International Publishing Switzerland 2015.


Azhagu Parvathi A.,VV Vanniaperumal College for Women
Acta Physica Polonica A | Year: 2013

Hydrogenic donor impurity binding energy is obtained in a ZnxCd1-xTe/ZnTe strained quantum dot taking into account the phonon confinement effect. The interaction of the electron and the phonon modes are expressed in terms of the Fröhlich interaction Hamiltonian. The binding energy is obtained for various Zn composition using the Aldrich-Bajaj effective potential. Calculations have been obtained using the Bessel function as an orthonormal basis for different confinement potentials of barrier height considering the internal electric field induced by the spontaneous and piezoelectric polarizations. Polaron induced linear and third-order nonlinear optical absorption coeffcients and the changes of refractive index as a function of incident photon energy are observed. Our results coincide with the recent observations of a hydrogenic impurity binding energy in a CdTe/ZnTe quantum dot solved analytically. It is observed that the potential taking into account the effects of phonon makes the hydrogenic binding energies larger than the obtained results using a Coulomb potential screened by a static dielectric constant and the optical properties of hydrogenic impurity in a quantum dot are strongly affected by the confining potential and the quantum size. It is found that the geometry of the quantum dot, zinc concentration and the effect of phonon have a great influence on the absorption coefficient and refractive index changes of the dot. It is also bserved that the magnitude of the absorption coefficients enhances with the inclusion of phonon effect.

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