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Search Results: 1 - 10 of 200506 matches for " P. Selvaraju "
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Transient analysis of a queue where potential customers are discouraged by queue length
P. R. Parthasarathy,N. Selvaraju
Mathematical Problems in Engineering , 2001, DOI: 10.1155/s1024123x01001727
Abstract: The transient solution is obtained analytically using continued fractions for a state-dependent birth-death queue in which potential customers are discouraged by the queue length. This queueing system is then compared with the well-known infinite server queueing system which has the same steady state solution as the model under consideration, whereas their transient solutions are different. A natural measure of speed of convergence of the mean number in the system to its stationarity is also computed.
Transient analysis of a queue where potential customers are discouraged by queue length
Parthasarathy P. R.,Selvaraju N.
Mathematical Problems in Engineering , 2001,
Abstract: The transient solution is obtained analytically using continued fractions for a state-dependent birth-death queue in which potential customers are discouraged by the queue length. This queueing system is then compared with the well-known infinite server queueing system which has the same steady state solution as the model under consideration, whereas their transient solutions are different. A natural measure of speed of convergence of the mean number in the system to its stationarity is also computed.
A Model pH Induced Drug-Delivery System Based on Poly(methacrylic acid) and its Interpolymer complex
K. Durai Murugan,C. Selvaraju,P. Natarajan
Physics , 2015,
Abstract: The dynamics and structural aspects of polymethacrylic acid bound rhodamine-123 (PMAA-R123) and its interpolymer complex with poly(vinylpyrrolidone) were investigated and the results show that these complexes have potential for use as drug-delivery system under physiological conditions. The time resolved fluorescence anisotropy decay of PMAA-R123 at different pH exhibits an associated anisotropy decay behavior characteristic of two different environments experienced by the fluorophore and decays with one shorter and another longer lifetime components. The anisotropy decay retains normal bi-exponential behavior under neutral pH. Fluorescence correlation spectroscopic investigation reveals that the attached fluorophore undergoes hydrolysis under basic condition which results in the release of the fluorophore from the polymer backbone. Shrinkage in the hydrodynamic radius of PMAA is observed on addition of the complementary polymer PVP which is attributed to the formation compact solubilised nanoparticle like aggregates. The size of particle further decreases on the addition of NaCl.
Neighborhood connected edge domination in graphs
Kulandaivel M.P.,C. Sivagnanam,P. Selvaraju
Tamkang Journal of Mathematics , 2012, DOI: 10.5556/j.tkjm.43.2012.69-80
Abstract: Let G = (V,E) be a connected graph. An edge dominating set X of G is called a neighborhood connected edge dominating set (nced-set) if the edge induced subgraph < N(X) > is connected. The minimum cardinality of a nced-set of G is called the neighborhood connected edge domination number of G and is denoted by. In this paper we initiate a study of this parameter.
Neighborhood connected perfect domination in graphs
Kulandai Vel M.P.,Selvaraju P.,Sivagnanam C.
Tamkang Journal of Mathematics , 2012, DOI: 10.5556/j.tkjm.43.2012.557-562
Abstract: Let $G = (V, E)$ be a connected graph. A set $S$ of vertices in $G$ is a perfect dominating set if every vertex $v$ in $V-S$ is adjacent to exactly one vertex in $S$. A perfect dominating set $S$ is said to be a neighborhood connected perfect dominating set (ncpd-set) if the induced subgraph $$ is connected. The minimum cardinality of a ncpd-set of $G$ is called the neighborhood connected perfect domination number of $G$ and is denoted by $gamma_{ncp}(G)$. In this paper we initiate a study of this parameter.
Growth and Characterization of L-glutamic Acid Hydro Chloro Bromide,A New Nonlinear Optical Material  [PDF]
S. Kumararaman, K. Kirubavathi, K. Selvaraju
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2011, DOI: 10.4236/jmmce.2011.101004
Abstract: The influence of mixed acids in the growth and characteristic properties of a nonlinear optical material L-glutamic acid hydro chloro bromide abbreviated as LGAHCB was examined. Single crystal X-ray diffraction analysis was used to calculate the lattice parameters of the crystals. Fourier transform infrared spectroscopies were performed to study the molecular vibrations of the grown crystal. The optical transmission spectrum shows very low absorption in the entire visible region. The powder second harmonic generation efficiency of LGAHCB is 1.5 times efficient as potassium dihydrogen phosphate (KDP).
Growth and Characterization of a New Semi-Organic Nonlinear Optical Crystal: Thiosemicarbazide Cadmium Acetate  [PDF]
K. Selvaraju, K. Kirubavathi, S. Kumararaman
Journal of Minerals and Materials Characterization and Engineering (JMMCE) , 2012, DOI: 10.4236/jmmce.2012.113022
Abstract: A new semi-organic nonlinear optical thiosemicarbazide cadmium acetate (TSCA) material has been synthesized. TSCA single crystals were grown from aqueous solution by slow evaporation method. The solubility of TSCA has been determined for various temperatures. The grown crystals were characterized by single crystal X-ray diffraction (XRD), FTIR, UV-Vis., thermal and second harmonic generation (SHG) analysis. Single crystal XRD study has been carried out to identify the lattice parameters. FTIR studies confirm the functional groups present in the grown crystal. Optical transmission studies have confirmed that the grown crystal is highly transparent. Thermogravimetric and differential thermal analyses reveal the good thermal stability of the material. The SHG conversion efficiency of TSCA was determined using Kurtz powder technique and found two times that of potassium dihydrogen orthophosphate (KDP).
Efficiency of RAPD and ISSR markers system in accessing genetic variation of rice bean (Vigna umbellata) landraces
Muthusamy,Saraladevi; Kanagarajan,Selvaraju; Ponnusamy,Shanmugasundaram;
Electronic Journal of Biotechnology , 2008,
Abstract: vigna umbellata (thunb.) ohwi and ohashi commonly known as rice bean or climbing mountain bean is under-exploited tropical legume. genetic variation between 10 landraces of rice bean was evaluated using random amplified polymorphic dna (rapd) and inter simple sequence repeats (issr) markers. among these markers, rapd primers generated 987 amplification products of which 719 were polymorphic and issr markers produced 479 amplification products, out of which 296 were polymorphic. rapd fingerprinting detected more polymorphic loci (70.30%) than the issr fingerprinting (61.79%). mean pic (polymorphism information content) for each of these marker systems (0.243 for rapd and 0.203 for issr) suggested that both the marker systems were equally effective in determining polymorphisms. the dendrograms constructed using rapd and issr marker systems were highly correlated with each other as revealed by high mantel correlation (r = 0.95). pairwise similarity index values ranged from 0.530 to 0.782 (rapd), 0.608 and 0.862 (issr) and 0.559 to 0.777 (rapd and issr) and mean similarity index value of 0.677, 0.729 and 0.694 for rapd, issr and combined data, respectively. rapd and issr marker systems were found to be useful for the genetic diversity studies in v. umbellata and identify variation within landraces.
Hydrazine-1,2-diium bis(3-carboxy-4-hydroxybenzenesulfonate) tetrahydrate
Devipriya Selvaraju,Ranjithkumar Venkatesh,Vairam Sundararajan
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811014231
Abstract: Reaction of 5-sulfosalicylic acid with hydrazine hydrate at pH = 1 results in the formation of the title hydrated salt, 0.5N2H62+·C7H5O6S ·2H2O. The hydrazinium dications lie on centres of inversion. They are located between 3-carboxy-4-hydroxybenzenesulfonate anions, forming intermolecular N—H...O hydrogen bonds with sulfonate ions and water molecules of crystallisation. Further intra- and intermolecular O—H...O hydrogen bonds are observed in the crystal structure.
Heavy Metal Induced Antioxidant Defense System of Green Microalgae and its Effective Role in Phycoremediation of Tannery Effluent
K.V. Ajayan,M. Selvaraju
Pakistan Journal of Biological Sciences , 2012,
Abstract: Investigation of tannery effluent toxicology in green microalgae is of great importance from ecological point of view, because heavy metal has become a major contaminant in recent years. The present study determined the effect of various concentrations (0, 10, 25, 50, 75 and 100%) of heavy metals containing tannery effluent on cell growth and antioxidant defense system of two green microalgae. Treatment with effluent induced accumulation of Reactive Oxygen Species (ROS), superoxide dismutase (SOD), catalase (CAT) and ascorbate peroxidase (APX). Lower tannery effluent concentrations increased algal growth, whereas higher concentration suppressed the growth and photosynthetic content. Both strains of the microalgae had proven effective in removing heavy metals from aqueous solutions with the highest removal efficiency being near 100% and it can be used for phycoremediation of wastewater in large scale.
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