Kanniyākumāri, India
Kanniyākumāri, India

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Vijayakumar C.,St Judes College | Brightson M.,St Judes College | Rayar S.L.,St Judes College
Journal of Experimental Nanoscience | Year: 2014

Nanoparticles of samarium barium antimonate (Ba2SmSbO6), a complex perovskite has been synthesised using an auto-ignition combustion process. The nanoparticles thus obtained have been characterised using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The particle size of the as-prepared powder was in the range 50-110 nm. Superconducting YBa2Cu3O7- δ material was synthesised through solid-state route and the thick film of YBa2Cu3O7- δ material was fabricated by dip-coating on Ba2SmSbO6 substrate. The prepared samples were subjected to various studies such as XRD, TEM, scanning electron microscopy, and resistivity measurement and the obtained results are presented and discussed. © 2014 Copyright Taylor & Francis Group, LLC.


Vethanathan S.J.K.,St Johns College | Brightson M.,St Judes College | Sundar S.M.,Sri Paramakalyani College | Perumal S.,S T Hindu College
Materials Chemistry and Physics | Year: 2011

Undoped and Manganese doped Zinc Oxide were prepared by solvothermal technique. The structural analysis was carried out using X-ray diffraction. It showed that the undoped Zinc Oxide and Manganese doped Zinc Oxide nanocrystals to exhibit hexagonal wurtzite structure. Grain sizes were estimated from Atomic Force Microscopy and Transmission Electron Microscopy images. The surface morphological studies from Scanning Electron Microscope, Transmission Electron Microscope and Atomic Force Microscope depicted spherical particles with formation of clusters. The magnetic behavior studied by Vibrating Sample Magnetometer indicated paramagnetic behaviour. Hyperfine splitting is observed using Electron Spin Resonance studies. © 2010 Elsevier B.V. All rights reserved.


Bansal C.,University of Hyderabad | Brightson M.,St Judes College
Phase Transitions | Year: 2015

(Ag2)xCu1− xS, x = .2, .4, .6 and .8 nanoparticles were synthesized by the solvothermal method. The as-synthesized nanoparticles were characterized by X-ray diffraction to study the crystal structure and size. The surface morphologies of the above samples were studied using scanning electron microscope. As there is continuous shift in the lower wavelength absorption edge of the UV–VIS spectrum of these samples with concentration, (Ag2)xCu1− xS nanoparticles can be tuned to different band gap energies by varying the composition. The D.C. electrical resistance was measured in the temperature range 310–485 K. As Ag2S transforms from monoclinic to bcc at around 450 K, copper sulfide nanoparticles also shows a phase transition at around 470 K, the effects of these two transitions are seen in the resistance measurements and in the UV–VIS spectra of the entire system. The electrical resistance of (Ag2)xCu1− xS nanoparticles rapidly reduces as more and more copper sulfide is added. © 2015 Taylor & Francis


Hentry C.,St Judes College | Chandrasekar N.,Manonmaniam Sundaranar University | Saravanan S.,St Judes College
Zeitschrift fur Geomorphologie | Year: 2013

In order to study the beach dynamics of Colachel on the Kanyakumari coast, field investigations were carried out on the beach profiles, breaking wave parameters and longshore currents for a period of 25 months from December 2006 to December 2008. Monthly measurements were made on littoral environmental observations (LEO) and beach level variations. Long shore sediment transport rates were estimated based on the observed data. The estimated annual gross long shore sediment transport rate was higher due to recent manmade structures and the net transport was towards west. The beach level was lowest in July and high in April and the range was 75 m. The total volume of sand transported is 1,810m3 only. The range of wave heights was between 0.5 to 2.5 m during 2007 and 0.5 to 2.2 m during 2008, whereas wave period was between 8 sec to 15.5 sec and 9.2 sec to 12.8 sec for 2007 and 2008 respectively. The study indicated that the beach is essentially stable but showing only seasonal fluctuations. Colachel, which is being subjected to erosion phase during Southwest monsoon season regained the profiles by January or February. Longshore currents were stronger in June, July and August and steady during rest of the year. The net westerly transport was approximately 0.9 × 10 6m3 during 2007 and 0.3 × 106m 3 during 2008. © 2012 Gebr. Borntraeger Verlagsbuchhandlung, Stuttgart, Germany.


Hentry C.,St Judes College | Chandrasekar N.,Manonmaniam Sundaranar University | Saravanan S.,Manonmaniam Sundaranar University | Sahayam J.D.,Manonmaniam Sundaranar University
Bulletin of Engineering Geology and the Environment | Year: 2010

The paper reports a study of the effects of the 26th December 2004 tsunami on a 3 km length of coastline in southern India. GIS maps were prepared based on field surveys and accounts given by eye-witnesses and survivors. It is concluded that the main height and run-out of the wave were much affected by the on-shore topography and off-shore bathymetry. Where the water immediately off-shore is deepest, the wave was highest, reaching some 10 m. The extent of the inundation is exacerbated by the presence of creeks/estuaries, where it extended to a kilometer inland, and minimized by the presence of a rocky coastline. Recommendations are made to mitigate the hazard. © 2010 Springer-Verlag.


Nicholas T.,St Judes College
Tamkang Journal of Mathematics | Year: 2010

A graph is said to be a sum graph if there exists a set S of positive integers as its vertex set with two vertices adjacent whenever their sum is in S. An integral sum graph is defined just as the sum graph, the difference being that the label set S is a subset of Z instead of set of positive integers. The sum number of a given graph G is defined as the smallest number of isolated vertices which when added to G results in a sum graph. The integral sum number of G is analogous. In this paper, we mainly prove that any connected graph G of order n with at least three vertices of degree (n - 1) is not an integral sum graph. We characterise the integral sum graph G of order n having exactly two vertices of degree (n - 1) each and hence give an alternative proof for the existence theorem of sum graphs.


Vilfred K.,St Judes College | Suryakala A.,Sree Devi KumariWomens College
Tamkang Journal of Mathematics | Year: 2015

For a,d,n ∈ ℕ, we define (a,d)-Continuous Monotonic Subgraph Decomposition or (a,d)-CMSD of a graph G of size (Formula presented.) as the decomposition of G into n subgraphs G1, G2,..., Gn without isolated vertices such that each Gi is connected and isomorphic to a proper subgraph of Gi+1 and |E(Gi)| = a+(i-1)d for i = 1, 2,..., n. (1,1)-CMSD of a graph G is called a Continuous Monotonic Subgraph Decomposition or CMSD of G. Harary introduced the concepts of sum and integral sum graphs and a family of integral sum graphs G-n,n over [-n,n] and it was generalized to G-m,n where [r,s] = {r,r+1,..., s}, r,s ∈ ℤ and m,n ∈ ℕ0. In this paper, we study (a,d)-CMSD of Kn+1 and G0,n into families of triangular books, triangular books with book mark and Fans with handle.

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