Coimbatore, India
Coimbatore, India

Time filter

Source Type

Mallaiya K.,PSG College of Technology | Subramaniam R.,PSG College of Technology | Srikandan S.S.,PSG College of Technology | Gowri S.,PSG College of Technology | And 2 more authors.
Electrochimica Acta | Year: 2011

The corrosion inhibition efficiency of a newly synthesized Schiff's base for the corrosion of mild steel was studied in 1.0 M HCl and 0.5 M H 2SO4 solutions. The results of weight loss measurements, electrochemical impedance and potentiodynamic polarization measurements consistently demonstrated that the Schiff's base synthesized is a good corrosion inhibitor with an inhibitory efficiency of approximately 92% at an optimum inhibitor concentration of 600 mg/L. The inhibition in both of the corrosive media was observed to be a mixed type. The potential of zero charge (PZC) at the metal-solution interface was determined for both the inhibited and uninhibited solutions to provide the mechanism of inhibition. The inhibitor formed a film on the metal surface through chloride or sulfate bridges depending upon the medium. The temperature dependence of the corrosion rate was also studied in the temperature range from 27 to 50 °C. The value of the activation energy (Ea) calculated showed that the inhibition film formation on the metal surface occurred through chemisorption. The thermodynamic parameters such as the adsorption equilibrium constant (Kads) and the free energy of adsorption (ΔGads) were calculated and discussed. Several adsorption isotherms were tested and the experimental data fit well with the Langmuir adsorption isotherm. © 2011 Elsevier Ltd. All rights reserved.


Fawzia Khan F.,Karpagam University | Mallika R.,CBM College
International Journal of Applied Engineering Research | Year: 2015

Object Oriented JavaScript is the most popularly used programming language by most of the web page developers for creating user friendly interaction pages. During the creation of web pages using the Java script, few bugs might be created which causes functionality failure of the web pages and affects the user friendly environment. There are many types of bugs in the object oriented java script which are needed to be detected for maintaining the user flexibility of the web pages. The detection of bugs is a tedious process normally done by using various Java script tools. In this research, tools such as JavaScriptLint, JSLint, CodeBeautify, ScrypTik, PMD and Yasca core are utilized to detect the bugs effectively. All these tools, however, exempted some bugs. The bug detection using the effective tools is evaluated and the limitations of bug exemption are discussed to develop a framework called Effective Object Oriented Bug Detection (EOOBD) based on the detection and non-detection of the bugs by these tools. For better detection of bugs, a matching algorithm called Boyer-Moore matching is utilized. The development of EOOBD is to evaluate what kind of bugs can be effectively detected using the detection tools and helps in understanding how to utilize suitable tools for different types of bugs in the Object Oriented Java script code. The experimental results also show that the proposed EOOBD provides sufficient understanding of various bugs and efficient tools to detect them with better accuracy. © Research India Publications.


Murugesan A.,Anna University | Ravikumar L.,Cbm College | SathyaSelvaBala V.,Anna University | SenthilKumar P.,SSN College of Engineering | And 5 more authors.
Desalination | Year: 2011

The removal of Pb(II), Cu(II) and Cd(II) ions onto polyazomethineamides (PAMA) has been investigated using batch adsorption techniques. The extent of adsorption was investigated as a function of pH, adsorbent dose, contact time and initial metal ion concentration. The metal ion removal was pH-dependent and reached maximum at pH 6.0. Experimental data were analysed by Langmuir, Freundlich, Redlich-Peterson and Temkin adsorption isotherms. The characteristic parameters for each isotherms and related correlation coefficients have been determined using MATLAB 7.1. The maximum adsorption capacities of PAMA for Pb(II), Cu(II) and Cd(II) ions were calculated from the Langmuir isotherm 452.1, 470.7 and 462.3. mg/g respectively. Pseudo-first-order, pseudo-second-order, Elovich kinetic and intraparticle diffusion models were used to fit the experimental data. Kinetic parameters, rate constants, equilibrium sorption capacities and related correlation coefficients, for each kinetic model were calculated and discussed. The kinetic studies showed that the pseudo-second-order rate equation was better described by the adsorption process. The FT-IR spectra of the adsorbent indicated that the amide, amide carbonyl and azomethine groups were major binding sites with the metal ions. The adsorption of PAMA for heavy metal is selective, and the adsorption capacity is in the order of Cu(II) > Cd(II). > Pb(II). © 2010 Elsevier B.V.


Murugesan A.,Anna University | Vidhyadevi T.,Anna University | Kalaivani S.S.,Anna University | Premkumar M.P.,Anna University | And 2 more authors.
Chemical Engineering Journal | Year: 2012

Novel poly(phenylthiourea)imine (PPTUI) was synthesized by the polycondensation of 4,4'-bis(thiourea)biphenylmethane in the presence of terephthaldehyde, using p-tolunesulfonic acid as the catalyst and dimethyformamide (DMF) as the solvent. The chemical, structural and textural characteristics of the adsorbent were determined by the FT-IR, 1H NMR, BET, SEM and EDAX analysis. The adsorption capacity of the PPTUI for the removal Ni2+ and Zn2+ ions from the aqueous solution was investigated. The adsorption parameters, such as pH, adsorbent dose, contact time, initial metal ion concentration and temperature were optimized. Batch adsorption kinetics have been mathematically described, and it has been found that the adsorption of Ni2+ and Zn2+ ions onto the PPTUI follow the pseudo-second order kinetic model. Adsorption isotherms have also been investigated, and the data fitted well in the order of the Sips>Redlich-Peterson>Freundlich>Langmuir isotherm models. The thermodynamic parameters of adsorption ΔH° and ΔG° suggest that the adsorption of Ni2+ and Zn2+ ions onto the PPTUI is endothermic and spontaneous in nature. Competitive adsorption decreases the amount of individual metal ions adsorbed, and the adsorption of the Ni2+ ion is higher than that of the Zn2+ ion. Desorption experiments show that the adsorption of Ni2+ and Zn2+ ions is reversible, and the adsorbent was easily regenerated with 90% adsorption capacity, even after four cycles. The PPTUI has good adsorption efficiency for the removal of Ni2+ and Zn2+ ions compared to other adsorbents. © 2012 Elsevier B.V.


Suresh Kumar B.,CBM College | Shivakumar B.L.,Sri Ramakrishna Engineering College
ARPN Journal of Engineering and Applied Sciences | Year: 2014

The image segmentation is used to change or simplify the image representation for the purpose of easy understanding or quicker analysis. Previously K-means classify images based on mean value of the groups formed with the help of centroids. FCM segments images based on the membership value and objective function used in it. Both of these methods work well for images with vast variations in its Pixel values but fails for pixels with slight variations. In order to overcome the disadvantages of various segmentation processes a new method of supervised segmentation is proposed using LOT (Linked Outlyingness Tree). The advantage of proposed method accuracy is more due to outlyingness Process and Process time is less. © 2006-2014 Asian Research Publishing Network (ARPN).


Krishnaveni K.,Mission Research | Ravichandran J.,Mission Research | Selvaraj A.,CBM College
Acta Metallurgica Sinica (English Letters) | Year: 2013

The Morinda tinctoria (MT) plant leaves extract was prepared in aqueous and hydrochloric acid media and was used as corrosion inhibitor for mild steel in hydrochloric acid medium. MT is found to be an efficient inhibitor at room temperature and the efficiency decreases with increase in temperature. Results from colorimetric studies predict the amount of iron present in the test solution and the percentage inhibition efficiency values calculated from this data fit well with the weight loss experiments. The AC impedance studies reveal that the mild steel surface is positively charged and the process of inhibition is through charge transfer. Polarisation studies indicate the mixed nature of the inhibitor. Thermodynamic parameters obtained predict that the process of inhibition is a spontaneous one. © The Chinese Society for Metals and Springer-Verlag Berlin Heidelberg.


Krishnaveni K.,Mission Research | Ravichandran J.,Mission Research | Selvaraj A.,CBM College
Ionics | Year: 2014

The corrosion inhibition of mild steel in 0.5 M sulphuric acid by aqueous and acid extracts of leaves of Morinda tinctoria was studied using weight loss, colorimetric and electrochemical techniques. Results obtained indicate that both the extracts are effective in sulphuric acid medium and the efficiency decreases with increase in temperature. Added halide additives improve the efficiency of the inhibitor. From the thermodynamic, spectral, and surface analyses, the nature of adsorption has been found out. © 2013 Springer-Verlag Berlin Heidelberg.


Sathyanarayanamoorthi V.,P.A. College | Sukumaran K.,CBM College | Kannappan V.,Layola College | Brindha S.,CBM College
Journal of Molecular Liquids | Year: 2011

Quantum mechanical solvation analysis accounts for electric and electro static components of solvation by microscopic surface tension. Solvation analysis is performed for two halo substituted phenyl 1H pyrazole-5 amines in different solvents. The free energy and its components such as electrostatic interaction, dispersion energy, and repulsion energy are computed. The systematic comparison of the electrostatic contribution of the free energy of solvation is carried out from the self-consistent reaction field. The effects of cavities and the dipole moments are examined. The investigated set consists of ten solvents with wide range of dielectric constant. © 2011 Elsevier B.V.


Chitra S.,PSGR Krishnammal College For Women | Parameswari K.,PSGR Krishnammal College For Women | Vidhya M.,PSGR Krishnammal College For Women | Kalishwari M.,PSGR Krishnammal College For Women | Selvaraj A.,CBM College
International Journal of Electrochemical Science | Year: 2011

Novel Quinoxaline derivatives have been synthesised and evaluated as corrosion inhibitors for mild steel in 1M sulphuric acid by weight loss, gasometry and electrochemical techniques. Results obtained showed that they are efficient corrosion inhibitors. Tafel polarisation studies revealed that the quinoxalines were mixed type inhibitors but slightly cathodic in nature. The adsorption of all the quinoxalines on the mild steel surface from the acid solution has been found to obey Langmuir adsorption isotherm. Addition of halide ions synergistically enhanced the inhibition of the quinoxalines. © 2011 by ESG.


Sathyanarayanamoorthi V.,P.A. College | Kannappan V.,Presidency College at Chennai | Sukumaran K.,CBM College
Journal of Molecular Liquids | Year: 2012

The polarizable continuum model (PCM) is employed to investigate theoretically the solvation of two heterocyclic compounds containing halogens. The PCM analysis has been carried out for 4-(4-chlorophenyl)-1,3-thiazol-2-amine and 4-(4-bromophenyl)-1,3-thiazol-2-amine in ten solvents with wide range of dielectric constants. In this paper, we report the results obtained in the computation of electrostatic interaction, repulsive component of Gibb's free energy of solvation, cavitation enthalpy and entropy of solvation for the two thiazole amines in various solvents. The dipole moments of the two amine molecules are calculated theoretically by AM1, PM3, MNDO and ab initio methods. The induced dipole moments of these two thiazoles are also calculated in these solvents. The thermodynamic properties of the systems, such as free energies, electrostatic interaction, cavitation enthalpy and dipole moment are discussed in terms of the physical properties such as dielectric constant, index of refraction, surface tension and molecular size of the solvents. © 2012 Elsevier B.V.

Loading CBM College collaborators
Loading CBM College collaborators