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Yadav S.M.,Government Engineering College Huvinahadagali | Arun K.V.,Government Engineering College Haveri | Basavarajappa .S.,Davangere University | Narendranath S.,National Institute of Technology Karnataka | Kumar S.,Shree Devi Institute of Technology
Polymer - Plastics Technology and Engineering | Year: 2011

In this work the moisture absorption capability, compressive properties, collapse modes of various types of composite sandwich structures are reported. The tested sandwich structures were constructed with varieties of hybridized skin materials and different compositions of the core materials. The moisture absorption, Flatwise compression and Edgewise compression tests are conducted for core as well as sandwich structures. Comparisons of results have been between the hybridized and non-hybridized sandwich structures. Two modes of collapse were noticed in the Edgewise compressive test, one of which being progressive end-crushing of the sandwich structure featured by significant crash energy absorption. This feature was highly desired for the parts of transportation vehicles. Microscopic analysis has been carried out to know the nature of failure under compressive loads. It has been observed that with increasing the debonding strength of the core-face interface, the failure mode changes from unstable collapse mode stable progressive crushing. © Taylor & Francis Group, LLC. Source


Bhat J.I.,Mangalore University | Alva V.D.P.,Shree Devi Institute of Technology
Journal of the Korean Chemical Society | Year: 2011

Corrosion inhibition of mild steel by nevirapine, an antiretroviral has been investigated using potentiodynamic polarization, electrochemical impedance spectroscopy technique and weight loss methods. The experimental results suggested, nevirapine is a good corrosion inhibitor for mild steel in 1M hydrochloric acid medium and the inhibition efficiency increased with increase in inhibitor concentration. The kinetic parameters for corrosion process and thermodynamic parameters for adsorption process were calculated and discussed. The adsorption of the inhibitor on the surface of mild steel followed Langmuir adsorption isotherm. Copyright © 2005 KCSNET. Source


Rao P.K.S.,Shree Devi Institute of Technology | Krishnan S.,Mangalore University | Pattabi M.,Mangalore University | Sanjeev G.,Mangalore University
Journal of Magnetism and Magnetic Materials | Year: 2016

The effect of 8 MeV electron irradiation on the magnetic and photoluminescence properties of Bi2Fe4O9 has been investigated and reported in this paper. Magnetic parameters of unirradiated and irradiated Bi2Fe4O9 nanoparticles were investigated by Vibrating sample magnetometer (VSM). Modification in saturation magnetization, remanence magnetization and coercivity were observed after exposure of Bi2Fe4O9 nanoparticles to high energy electrons. A decrease in the intensity of photoluminescence (PL) spectra was observed in irradiated samples compared to the unirradiated samples. © 2015 Elsevier B.V. All rights reserved. Source


Bhat J.I.,Mangalore University | Alva V.D.P.,Shree Devi Institute of Technology
Synthesis and Reactivity in Inorganic, Metal-Organic and Nano-Metal Chemistry | Year: 2012

The effect of miconazole nitrate, an antifungal drug on the corrosion behavior of aluminium in 1 M hydrochloric acid has been investigated using potentiodynamic polarization, electrochemical impedance spectroscopy technique and weight loss methods. The inhibition efficiency increased with increase in inhibitor concentration, but decreased with increase in temperature. The thermodynamic parameters of corrosion and adsorption processes were evaluated. The adsorption of the inhibitor molecule was found to occur on the metal surface following Langmuir adsorption isotherm. © 2012 Copyright Taylor and Francis Group, LLC. Source


Bhat J.I.,Mangalore University | Alva V.D.P.,Shree Devi Institute of Technology
Journal of the Korean Chemical Society | Year: 2014

The corrosion behavior of aluminum and mild steel in hydrochloric acid medium was studied using a nicotinic acid hydrazide as inhibitor by potentiodynamic polarization, electrochemical impedance spectroscopy technique and gravimetric methods. The effects of inhibitor concentration and temperature were investigated. The experimental results suggested, nicotinic acid hydrazide is a good corrosion inhibitor for both aluminum and mild steel in hydrochloric acid medium and the inhibition efficiency increased with increase in the inhibitor concentration. The polarization studies revealed that nicotinic acid hydrazide exhibits mixed type of inhibition. The inhibition was assumed to occur via adsorption of the inhibitor molecules on the aluminum and mild steel surface and inhibits corrosion by blocking the reaction sites on the surface of aluminum. Source

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