Arulmigu Palani Andavar College Of Arts
Palani, India
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Rajamanikkam N.,Arulmigu Palani Andavar College Of Arts | Ravichandran C.G.,SCAD Institute of Technology
Journal of Computational and Theoretical Nanoscience | Year: 2016

For efficient disease detection and treatment, images from different modalities are combined with help of fusion techniques. According to, currently, medical image fusion scheme is a challenging task in healthcare applications like diagnosis, research and treatment etc. In this study, a multimodality medical image fusion scheme is proposed and the performance is analyzed using quantitative measure. At first, two different pairs of image are taken as input: Magnetic Resonance Imaging (MRI) and Computed Tomography (CT). These pair of images is fused together using fusion formula, which formulated based on transparency-labeling to reduce the computational load. In addition, we state the problem as a discrete multi-label optimization using firefly algorithm, which combines squared error and weighted entropy. The proposed medical image fusion guarantees nearly global solutions, avoiding the pix elation artifacts and too much computation load. The resultant is analyzed using quantitative matrices like as mean square error (MSE). From the experimental results, it is observe that the proposed medical image fusion scheme is efficient in better quality of images which is inferred from the values of MSE. © 2016 American Scientific Publishers All rights reserved.

Devaraju S.,Anna University | Vengatesan M.R.,Anna University | Ashok Kumar A.,Arulmigu Palani Andavar College Of Arts | Alagar M.,Anna University
Journal of Sol-Gel Science and Technology | Year: 2011

New type of Polybenzoxazine-silica (PBZ-SiO2) hybrid nanocomposites was prepared through in situ sol-gel method. Benzoxazine was synthesized using bisphenol-A, trans-4-aminocyclohexanol hydrochloride and formaldehyde solution through Mannich condensation reaction and was characterized by FT-IR, 1HNMR and 13CNMR spectroscopy. The methodology adopted in the present study involves to formation of hydrogen bond interaction between the benzoxazine monomer and the silica matrix, followed by the ring opening polymerization of benzoxazine monomer through thermal curing to obtain a red brown transparent PBZ-SiO2 hybrid. The formation of hybrid nanocomposites was confirmed by FT-IR. Thermal and morphological properties of the hybrid materials were investigated by the differential scanning calorimetry (DSC), thermo gravimetric analysis (TGA), scanning electron microscopy (SEM). The PBZ-SiO2 hybrids show improved thermal properties and glass transition (Tg) temperature. The nitrogen porosimetry study was carried out to confirm the nanometer level integration of polybenzoxazine in the PBZ-SiO2 hybrid nanocomposites. © 2011 Springer Science+Business Media, LLC.

Amutha M.,Arulmigu Palani Andavar College Of Arts | Lalitha P.,Avinashilingam University For Women | Firdhouse M.J.,Avinashilingam University For Women
Journal of Nanotechnology | Year: 2014

Nanosilver was synthesized using the aqueous solution of solvent extracts of leaf and stem of Kedrostis foetidissima. Three different methods of formation of silver nanoparticles such as reaction at (i) room temperature, (ii) higher temperature, and (iii) sonication were employed in the present study. The synthesized silver nanoparticles were characterized by UV-visible spectroscopy, X-ray diffractometer, Scherrer's formula, scanning electron microscopy, and FTIR analysis. © 2014 M. Amutha et al.

Manimegalai S.,Arulmigu Palani Andavar College Of Arts | Manjula P.,A PA College for Women
Journal of Materials and Environmental Science | Year: 2015

The Phaeophyceae or brown algae is a large group of marine multicelluar algae and play an important role in marine environments both as food, medicines and industrial purposes. In present study, the inhibition effect of methanolic extract of Sargassum swartzii (brown algae) and Zn 2+ ions (100 ppm) on the corrosion of mild steel in aqueous medium containing 60ppm Cl- ion was studied by weight loss method at 303 K - 343 K. The energy of activation , adsorption and thermodynamic parameters were evaluated from the results of temperature study. The inhibition efficiency increased with increase in the inhibitor concentration and decreased with rise in temperature. Sargassum swartzii (SS) extract is brought about by the increasing its activation energy(Ea) as a result of adsorption is physical adsorption. The adsorption of Sargassum swartzii on mild steel surface was found to obey Langmuir , Temkin and Freundlich adsorption isotherms. ΔG°ads value indicated a strong and spontaneous adsorption of the SS extract components on the metal surface. Thus, it can be concluded that Sargassum swartzii - Zn2+ inhibitor system acted as a good inhibitor in aqueous medium.

Kalidasan K.,Arulmigu Palani Andavar College Of Arts | Kanna P.R.,Velammal College of Engineering and Technology
Journal of the Taiwan Institute of Chemical Engineers | Year: 2016

A finite difference based two dimensional numerical analysis of laminar natural convection inside the open square enclosure containing nanofluid of water with multi-walled carbon nanotube (MWCNT) is presented by stream function-vorticity approach. The left wall is subjected to sinusoidal time-variant temperature. The top and bottom walls are considered as adiabatic and the right wall is kept as ambient. The flow is diagonally downward and opposed by the buoyancy force. In the numerical analysis, Xue [30] model of thermal conductivity is coupled with modified Krieger and Dougherty (K-D) model of viscosity based on rheology of suspension of particles. The variables considered in the present study are Rayleigh number (104-106), volumetric fraction of MWCNT (0<φ<1.5%), amplitude (0

Kalidasan K.,Arulmigu Palani Andavar College Of Arts | Velkennedy R.,Thiagarajar College of Engineering | Rajesh Kanna P.,Velammal College of Engineering and Technology
Applied Thermal Engineering | Year: 2016

A finite difference based two dimensional numerical investigation of laminar natural convection inside the closed square enclosure filled with copper-water nanofluid and two diagonally placed adiabatic blocks is presented by vorticity-stream function approach. The left and right walls are assumed as hot and the top wall is kept as cold. The temperature of bottom wall varies sinusoidal over time. The variables considered in the present study are Rayleigh number (104 to 106), volumetric fraction of copper particles (0 < φ < 4%), amplitude (0 < a < 0.5) and the period (0.001 < τ < 0.8). The periodic results of fluid flow are elucidated with Streamlines, Isotherms and Nusselt number. The combined effect of nanofluid and time-variant temperature at the bottom wall suppresses the hydrodynamic blockage effect of solid blocks and enhanced the convective heat transfer. The time-averaged local Nu is increased by a maximum of 11% when comparing with pure fluid. © 2015 Elsevier Ltd. All rights reserved.

Kalidasan K.,Arulmigu Palani Andavar College Of Arts | Kalidasan K.,Thiagarajar College of Engineering | Kalidasan K.,Anna University | Velkennedy R.,Thiagarajar College of Engineering | And 3 more authors.
Numerical Heat Transfer; Part A: Applications | Year: 2014

A finite volume-based computational study of steady laminar natural convection inside the square enclosure with cold partition wall centrally placed on top and bottom is presented. The fluid considered is air with Prandtl number 0.71. Except the partition walls, all other walls were assumed as hot. The heights of inlet and outlet ports are constantly fixed as 20% of height of the enclosure. The height of the opening in the partition walls were 10%, 20%, and 30% of height of enclosure. The buoyancy-driven heat transfer mechanism inside the domain is influenced by the percentage of opening in the partition, Rayleigh number, and geometrical position of inlet and outlet. The cold partition walls attract the flow that subsequently influences the thermal modifications around the partition. The fluid flow and heat transfer were investigated for 81 cases with different positions of inlet and outlet and varying height of openings for Ra = 103, 104, and 105. The cross flow between the vertical walls through the opening in the central partition wall was considered in this study. The formation of vortices and their sizes depends on the configuration of inlet and outlet ports. The higher temperature gradient occurs near the inlet and outlet port of vertical walls. Local Nusselt number is maximum just below the inlet for all cases. Due to the dominance of buoyancy forces, heat transfer rate increases when Rayleigh number increases for all the cases. The hydrodynamic block effect by the openings on the partition wall has significant effect on the velocity profile than on the heat transfer. © 2014 Taylor and Francis Group, LLC.

Devaraju S.,Anna University | Vengatesan M.R.,Anna University | Selvi M.,Anna University | Kumar A.A.,Arulmigu Palani Andavar College Of Arts | Alagar M.,Anna University
High Performance Polymers | Year: 2012

Polyhedral oligomeric silsesquioxane (POSS)-polyimide (PI) hybrid nanocomposites were prepared by a two-step approach, bisphenol-A ether diamine (BAED) and pyromelletic dianhydride (PMDA) in 1-methyl-2-pyrrolidone (NMP) were used to prepare polyamic acid (PAA) to which varying weight percentages of OAPS in NMP were added. During the second step, the polycondensation was effected by thermal imidization. The formation of hybrid nanocomposites was confirmed by using FTIR spectra. The thermal properties of POSS-PI nanocomposites were studied using differential scanning calorimetry and thermogravimetric analysis. The lowest dielectric constant 2.68 was achieved for 15 wt.% POSS-PI material when compared with the value of 3.34 for the neat PI. Data from thermal studies indicate that the incorporation of POSS into polyimide significantly enhanced the glass transition temperature (Tg), thermal stability, char yield and flame-retardant properties of hybrid nanocomposites than that of neat PI. The excellent combination of both dielectric and thermal properties of the material developed in the present study will find application in microelectronics. © 2012 The Author(s).

Chandramohan A.,Anna University | Dinkaran K.,Anna University | Kumar A.A.,Arulmigu Palani Andavar College Of Arts | Alagar M.,Anna University
High Performance Polymers | Year: 2012

Polyhedral oligomeric silsesquioxane (POSS) viz; namely, Octa functional silsesquioxanes [octa amino (OAPS) and octa glycidyl (OG)] reinforced epoxy modified cyanate ester nanocomposites were prepared through intercrosslinked network. The intercrosslinking formation between cyanate ester and POSS was confirmed by Fourier transform infrared spectroscopy. The morphology of nanocomposites was studied using X-ray diffraction, scanning electron microscopy, transmission electron microscopy and atomic force microscopy techniques. The electrical properties of the nanocomposites were evaluated by impedance analyzer. The influences of POSS macromer on the thermal and mechanical properties of epoxy modified cyanate ester nanocomposites were also addressed. The thermogravimetric analysis indicates that the thermal stability of the nanocomposites increases with increasing percentage of both types of POSS macromer. The dielectric constant and dielectric loss are decreased with increasing POSS concentration in the epoxy modified cyanate ester nanocomposites. © The Author(s) 2012.

Kandasamy R.,Arulmigu Palani Andavar College Of Arts | Thenmozhi R.,Government College of Technology, Coimbatore
Advanced Materials Research | Year: 2014

Effective length factor of CFS lipped channel beams subjected to flexure are given in AS/NSZ 4600, Euro code Part 1.3 and BS 5950, Part V taking into account their buckling phenomena. The coefficients are given for boundary conditions considering the effect of torsion and warping restraint. The effect of torsion and warping restraints is treated by defining the range of values for the coefficients. Lateral torsion buckling of the CFS beams greatly influences the effective length factors. 16 CFS lipped channel beams have been taken for the study with depth of 100mm, flange width 50mm and lip size varies from 10mm to 20mm.Experimental investigation has been carried out to verify the coefficients for the defined boundary conditions. The influence of flange width and lip size on the buckling length has been investigated. The results are compared with the Indian code provisions for hot rolled beams. © (2014) Trans Tech Publications, Switzerland.

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