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Annāmalainagar, India

Ramadoss G.,Shivani Institute of Technology | Senthilkumar C.,Annamalai UniversityTamilnadu | Boopathi R.,Sathyabama University
International Journal of Applied Engineering Research | Year: 2014

Non conventional machining is increasing in importance due to some of the specific advantages, which can be demoralized during machining operation. Electrical Discharge Machining (EDM) appears to be a positive technique, since in many areas of application, it offers several unique advantages including superior machining rate, enhanced precision and control, and a wider variety of materials that can be machined. Therefore the present research is initiated to investigate the influence of some of the predominant electrical discharge process parameters such as current, pulse ON-time, flushing pressure and vibration on the metal removal rate (MRR) and tool wear rate (TWR) to fulfill the effective utilization of electrical discharge machining of 6061Al/TiB2 composites produced through in-situ casting technique. The Response Surface Methodology (RSM) is used to identify the most influential parameters and also to establish a comprehensive statistical model for correlating the interactive and higher-order influences of various machining parameters. © Research India Publications. Source

Gowthaman S.,Annamalai UniversityTamilnadu | Sathiyagnanam A.P.,Annamalai UniversityTamilnadu
International Journal of Applied Engineering Research | Year: 2015

Biodiesel has suitable alternative fuel for diesel engine with high thermal efficiency and lower exhaust emissions of CO and HC. But biodiesel fuelled engine has higher level of smoke and oxides of nitrogen emissions in the exhaust due to higher viscosity and more oxygen molecules in the biodiesel compared to reference diesel. In order to overcome these limitations and further reduce the emission in biodiesel fuelled engine, a homogeneous charge compression ignition engine is suitable replacement for conventional DI diesel engine. The homogeneous charge compression ignition engines are capable of providing more power output especially at high load and reducing exhaust emissions of oxides of nitrogen (NOx) and soot than conventional diesel engine. This study, investigate the combustion, performance and emission characteristics of HCCI engine using cotton seed biodiesel as a primary fuel. And also analyse the effect of charge temperature on HCCI combustion parameters such as start of combustion (SOC) and combustion duration and analyse the changes in HCCI engine performance and emission parameters. The experimental investigations have been conducted with different inlet charge temperatures of 90°C, 100°C, 110°C, 120°C, 130°C, 140°C and limited the charge temperature for poor output and higher level of emissions of HCCI engine. This paper described the result of ultra low NOx and soot emissions in biodiesel fuelled HCCI engine compared to diesel engine. The NOx and soot emissions are reduced about 40% and 28% respectively than convention diesel engine. The result of this study indicated that the HCCI engine has consumed less amount of fuel and produced higher power output at high load operation. And the result shows, the brake thermal efficiency (BTE) has been increased with increasing the charge temperature. Because of the higher inlet air temperature could reduced the ignition delay and combustion duration of the charge. The inlet charge temperature could reflect on HC and CO emissions and result showed that, there is slight reduction in HC and CO emissions in biodiesel fuelled engine. © Research India Publications. Source

Vaishnavi D.,Annamalai UniversityTamilnadu | Subashini T.S.,Annamalai UniversityTamilnadu
Journal of Electrical Engineering and Technology | Year: 2015

This paper proposes a novel watermarking method to discover the tampers and localize it in digital image. The image which is to be used to generate a watermark is first wavelet decomposed and the edge feature from the sub bands of high frequency coefficients are retrieved to generate a watermark (Edge Feature Image) and which is to be embed on the cover image. Before embedding the watermark, the pixels of cover image are disordered through the Arnold Transform and this helps to upgrade the security of the watermark. The embedding of generated edge feature image is done only on the Least Significant Bit (LSB) of the cover image. The invisibleness and robustness of the proposed method is computed using Peak-Signal to Noise Ratio (PSNR) and Normalized Correlation (NC) and it proves that the proposed method delivers good results and the proposed method also detects and localizes the tampers efficiently. The invisibleness of proposed method is compared with the existing method and it proves that the proposed method is better. © The Korean Institute of Electrical Engineers. Source

Venkatesan S.,Annamalai UniversityTamilnadu | Kannappan N.,Annamalai UniversityTamilnadu
International Journal of ChemTech Research | Year: 2014

Developed and optimized a validated isocratic reverse phase HPLC separation of Cefixime, Levofloxacin, and Moxifloxacin in pharmaceutical preparation using Response surface methodology. The separation was applied by using Phenomenex C18 column (15 cm × 4.6 mm id, 5 μm particle size) and UV detection at 283 nm. The ranges of the individual variables used for the optimization were acetonitrile: 30-35%, flow rate: 0.8-1.2 and buffer concentration 25-35mM. The influence of these individual variables on the output responses: capacity factor of the first peak(k1), resolutions of the 2nd and 3rd peak (Rs2,3) and Retention time of the third peak (tR3) were evaluated. Using this strategy, a mathematical model was defined and a response surface was derived for the separation. The three responses were simultaneously optimized by using Derringer’s desirability functions. The optimum conditions predicted for quality control samples were acetonitrile-potassium dihydrogen phosphate buffer (35 mM, pH 7.0)-triethylamine 32.43:67.52:0.05 (v/v) as mobile phase and 1.2 mL min-1 as flow rate. Total chromatographic analysis time per sample was approximately 4.7 min. The optimized assay condition was validated as per the ICH guidelines and applied for the quantitative analysis of commercial formulations. The developed method was simple, accurate and precise. Hence, it can be employed for the routine analysis in quality control laboratories. © 2014, Sphinx Knowledge House. All rights reserved. Source

Vaishnavi D.,Annamalai UniversityTamilnadu | Subashini T.S.,Annamalai UniversityTamilnadu
International Journal of Applied Engineering Research | Year: 2014

In this paper, a robust image watermarking method is proposed to alleviate the geometric distortion problems. In this method, a logo is chosen as watermark and is embedded in the DC coefficients of normalized host image. Normalized image is acquired by transforming the image to its original co-ordinate position using the affine parameters. These parameters are estimated by the geometric moments of an image. The security of the proposed method is increased by employing the Arnold scrambling on the logo watermark before embedding on it. The performance of the proposed method is quantified using the Peak-Signal-to-Noise Ratio (PSNR) and Normalized Correlation (NC) metrics. The robustness of the proposed method is compared with the existing method and it proves that the proposed method is highly resilient to geometric distortions. © Research India Publications. Source

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