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Mallikarjuna C.,Al Jabal Al Garbhi University | Shashidhara S.M.,Kalpataru Institute of Technology | Mallik U.S.,Siddaganga Institute of Technology | Parashivamurthy K.I.,Siddaganga Institute of Technology
Materials and Design | Year: 2011

A salt base exothermic reaction process has been employed to produce aluminum alloy 2014 matrix-TiB2 composites using an exothermic reaction process at 850°C using K2TiF6 and KBF4 salts. The period of exothermic reaction was varied from a minimum of 15min to a maximum of 45min to investigate the relationship between the degree of reaction and the growth behavior of TiB2 formed. These have been compared with commercially available aluminum alloy 2014 material. Structural and wear properties have been measured. These show that TiB2 is extremely effective in enhancing wear properties in addition to significantly reducing the coefficient of friction. The microstructure and phase composition of the materials obtained were studied using X-ray diffraction and scanning electron microscopy (SEM). Very fine ceramic particles were obtained in the aluminum alloy matrix. © 2011. Source


Aravind B.N.,Kalpataru Institute of Technology | Suresh K.V.,Siddaganga Institute of Technology
Proceedings - 2014 5th International Conference on Signal and Image Processing, ICSIP 2014 | Year: 2014

The problem of reconstructing digital images from degraded measurement is regarded as a problem of importance in various fields of engineering and imaging science. The main goal of denoising is to restore an image from its noisy version to obtain a visually high quality image. In this paper we propose a novel method that uses Markov random field (MRF) for image denoising. First, the image is modeled as MRF and then the maximum a posteriori (MAP) estimation method is used to derive the cost function. Afterwards it is optimized to obtain denoised image. The result is compared with traditional spatial domain methods. The visual and quantitative evaluation suggests that the proposed method yields better results. © 2014 IEEE. Source


Aravind B.N.,Kalpataru Institute of Technology | Suresh K.V.,Siddaganga Institute of Technology
Journal of Intelligent Systems | Year: 2012

The problem of reconstructing digital images from degraded measurements is regarded as a problem of importance in various fields of engineering and imaging science. The main goal of denoising is to restore a noisy image to produce a visually high quality image. In this paper, we propose a novel transform domain technique that uses multispinning for image denoising. The proposed method uses multiple cyclic shifted versions of an image, where each of them would capture more detail information during decomposition. Discrete wavelet transform (DWT) and contourlet transform (CT) in association with multispinning is used. The results are compared with traditional transform (soft thresholding) and spatial domain techniques. The visual and quantitative evaluation suggests that the proposed method yields better results. © de Gruyter 2012. Source


Kiran T.S.,Kalpataru Institute of Technology | Prasanna Kumar M.,Visvesvaraya Technological University | Basavarajappa S.,Davangere University | Viswanatha B.M.,Kalpataru Institute of Technology
Materials and Design | Year: 2014

Dry sliding wear behavior of zinc based alloy and composite reinforced with SiCp (9. wt%) and Gr (3. wt%) fabricated by stir casting method was investigated. Heat treatment (HT) and aging of the specimen were carried out, followed by water quenching. Wear behavior was evaluated using pin on disc apparatus. Taguchi technique was used to estimate the parameters affecting the wear significantly. The effect of HT was that it reduced the microcracks, residual stresses and improved the distribution of microconstituents. The influence of various parameters like applied load, sliding speed and sliding distance on wear behavior was investigated by means and analysis of variance (ANOVA). Further, correlation between the parameters was determined by multiple linear regression equation for each response. It was observed that the applied load significantly influenced the wear volume loss (WVL), followed by sliding speed implying that increase in either applied load or sliding speed increases the WVL. Whereas for composites, sliding distance showed a negative influence on wear indicating that increase in sliding distance reduces WVL due to the presence of reinforcements. The wear mechanism of the worn out specimen was analyzed using scanning electron microscopy. The analysis shows that the formation and retention of ceramic mixed mechanical layer (CMML) plays a major role in the dry sliding wear resistance. © 2014 Elsevier Ltd. Source


Kiran T.S.,Kalpataru Institute of Technology | Prasannakumar M.,Bapuji Institute of Engineering and Technology | Basavarajappa S.,Davangere University | Viswanatha B.M.,Kalpataru Institute of Technology
Industrial Lubrication and Tribology | Year: 2015

Purpose - The purpose of the paper is to study the dry sliding wear behavior of as-cast and heat-treated zinc-aluminum (ZA-27) alloy, reinforced with silicon carbide and graphite particles. Design/methodology/approach - The alloy and composite samples were prepared with stir casting technique. Heat treatment was carried out for samples at a temperature of 370°C followed by quenching in water at room temperature. Subsequently, the heat-treated samples were aged at 180°C and quenched in water at room temperature. The wear tests were carried using pin-on-disc apparatus at room temperature at different applied loads, sliding speed and sliding distance. Findings - The wear volume loss of as-cast samples was more compared with heat treated samples. Composites exhibited improved wear resistance than base alloy. Originality/value - Hybrid metal matrix composites with heat treatment has exhibited superior wear behavior in dry sliding conditions. © 2015 Emerald Group Publishing Limited. Source

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