Shree Devi Institute of Technology

Mangalore, India

Shree Devi Institute of Technology

Mangalore, India
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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.


Rao P.K.S.,Shree Devi Institute of Technology | Krishnan S.,Shree Devi Institute of Technology | Pattabi M.,Mangalore University | Sanjeev G.,Mangalore University
International Journal of ChemTech Research | Year: 2015

Multiferroic YMnO3 nanoparticles have been synthesized by sol-gel method. The effect of 8 MeV electron irradiation on the structural properties of YMnO3 nanoparticles under variable doses has been investigated. X-ray diffraction pattern confirms no phase change after irradiation. The crystallinity of the samples was found to improve with irradiation. However, microstrain developed in YMnO3 nanoparticles due to electron irradiation causes peak broadening and shifting of X-ray diffraction pattern lines to lower diffraction angles. This indicates the presence of induced defects on irradiation. Various structural parameters under variable doses were calculated from XRD data. © 2015, Sphinx Knowledge House. All right reserved.


Ishwara Bhat J.,Mangalore University | Alva V.D.P.,Shree Devi Institute of Technology
Transactions of the Indian Institute of Metals | Year: 2011

The inhibition effect of meclizine hydrochloride on the corrosion behaviour of aluminium in 1 M hydrochloric acid medium was studied by weight loss, potentiodynamic polarisation and electrochemical impedance spectroscopy techniques. Results obtained revealed that Meclizine performed excellently as a corrosion inhibitor for aluminium in HCl medium at 303 K. The effect of temperature on inhibition efficiency was studied. The inhibition was assumed to occur via adsorption of the inhibitor molecule on the metal surface. The adsorption of the inhibitor on the aluminium surface followed Langmuir adsorption isotherm model. The values of activation energy and thermodynamic parameters were calculated and discussed. © 2011 Indian Institute of Metals.


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.


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.


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.


Rao P.K.S.,Shree Devi Institute of Technology | Krishnan S.,Shree Devi Institute of Technology | Pattabi M.,Mangalore University | Sanjeev G.,Mangalore University
Radiation Physics and Chemistry | Year: 2015

The effect of electron irradiation on the structural, electric and dielectric properties of Bi2Fe4O9 nanoparticles synthesized by standard sol-gel method is studied and reported in this paper. The samples were subjected to different doses of electrons of energy 8MeV. X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry (DSC), dielectric properties, AC conductivity and current-voltage (I-V) characteristics of the nanoparticles were studied before and after irradiation. DSC curve shows a shift in crystallization peak positions on electron irradiation. The dielectric spectrum and AC electrical conductivity of the nanoparticles were found to increase after irradiation. © 2015.


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.


Dilip Kumar K.,Shree Devi Institute of Technology | Appukuttan K.K.,Maulana Azad National Institute of Technology | Neelakantha V.L.,Canara Engineering College | Naik P.S.,National Institute of Technology Karnataka
Materials and Design | Year: 2014

In automotive industry, significant efforts are being put forth to replace steel sheets with aluminum sheets for various applications. Besides its higher cost, there are several technical hurdles for wide usage of aluminum sheets in forming. Major problems in aluminum sheet metal forming operations are deformation errors and spring back effect. These problems are dependent on the number of parameters such as die and tool geometry, friction condition, loading condition and anisotropic properties of the metal.To predict the exact shape, the geometry based punch contact program must be used. The shape changes once the punch is withdrawn, because of the materials elasticity. Prediction of such a spring back effect is a major challenging problem in industry involving sheet metal forming operations. It also needs applying appropriate back tension during the forming complex shapes. Slight deformation of the metal leads to non-axisymmetric loading. One can predict the residual stress by determining plastic and elastic deformation. Thus appropriate spring back effect can be investigated.The present investigation was carried out to determine the spring back and thinning effect of aluminum sheet metal during L-bending operation. Number of specimens with thickness varying from 0.5. mm to 3.5. mm were prepared. The experiments were conducted for different clearances between punch and die. It is observed that, beyond a particular clearance for each thickness of the sheet metal, the spring back and thinning effects were linearly increasing. However, below the critical clearance, scratches on the surface of the sheet metal were seen due to wear. The scratches were analyzed through Scanning Electron micrographs. As the clearance between punch and die reduces further, more wear on the punching surface was observed. And, as the clearance increases it leads to increase the spring back effect and fracture propagation. © 2013 Elsevier Ltd.

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