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Brugnago R.J.,Federal University of Parana | Satyanarayana K.G.,Acharya Institute of Technology | Satyanarayana K.G.,BMS College of Engineering | Wypych F.,Federal University of Parana | Ramos L.P.,Federal University of Parana
Composites Part A: Applied Science and Manufacturing | Year: 2011

This paper describes a pretreatment option to sugarcane bagasse fibers for their use in composite preparation with unsaturated polyester. Sugarcane bagasse fibers modified by (i) steam explosion and (ii) alkali washing after steam explosion, along with (iii) as-received bagasse fibers were characterized. Steam explosion significantly reduced the amount of hemicelluloses and acid-soluble lignin of bagasse fibers, while acid-insoluble lignin increased proportionally. Alkaline washing of steam-exploded fibers removed nearly 60% of their acid-insoluble lignin. Polyester matrix composites containing 10 wt.% of these fibers were prepared by compression molding. Density, thermal stability, water absorption and thermomechanical analysis of the composites containing steam explosion treated bagasse fibers showed improvement in these properties over those of the untreated fiber containing composite. These are explained in terms of the chemical modifications that occurred due to the steam explosion treatments. © 2010 Elsevier Ltd. All rights reserved. Source

Mahadevaswamy P.,Acharya Institute of Technology | Suresh B.S.,BMS College of Engineering
International Journal of Structural Stability and Dynamics | Year: 2015

The transverse vibration control of a clamped, rectangular, isotropic plate by a vibratory flap subjected to harmonic excitation has been investigated by Finite Element Analysis (FEA) and experimental technique. The vibratory flap is a new plate-type dynamic vibration absorber, which can vibrate on the plate when attached as a cantilever plate. The study has been focused specifically on the influence of aspect ratio of vibratory flap on the dynamic response of the plate at constant mass ratio and constant tuning frequency ratio. The study has revealed that the dynamic response of the plate varies with respect to the aspect ratio for aforementioned conditions. An optimum aspect ratio has also been obtained by minimizing the mass ratio with maximum attenuation in the first and second target frequencies. The results have shown that the optimized flap can trim down the plate vibrations by up to 90-95% in the fundamental mode. Moreover, the dynamic response of the plate can be improved to a great extent due to the adoption of an optimal aspect ratio of the flap. Finally, the experimental outcomes have shown fairly good agreement with the results obtained from the finite element analysis. © 2015 World Scientific Publishing Company. Source

Sadashiv N.,Acharya Institute of Technology | Kumar S.M.D.,University Visvesvaraya College of Engineering
ICCSE 2011 - 6th International Conference on Computer Science and Education, Final Program and Proceedings | Year: 2011

Cloud computing is rapidly growing as an alternative to conventional computing. However, it is based on models like cluster computing, distributed computing, utility computing and grid computing in general. This paper presents an end-to-end comparison between Cluster Computing, Grid Computing and Cloud Computing, along with the challenges they face. This could help in better understanding these models and to know how they differ from its related concepts, all in one go. It also discusses the ongoing projects and different applications that use these computing models as a platform for execution. An insight into some of the tools which can be used in the three computing models to design and develop applications is given. This could help in bringing out the innovative ideas in the field and can be explored to the needs in the computing world. © 2011 IEEE. Source

Kempraj V.,33rd Cross | Bhat S.K.,Acharya Institute of Technology
Pesticide Biochemistry and Physiology | Year: 2011

The current study involved evaluation of the toxicity of acetone soluble fraction of the ethanol extract of Annona squamosa Linn. seeds on Aedes albopictus (Skuse). Toxicity of fresh sample has been compared with that of solar radiated and heat treated aliquots of the same. Acute toxicity of fresh acetone fraction on adults was evident with LC50 and LC90 values of 15.21 and 60.38μg/ml, respectively. Larvicidal bioassays recorded LC50 and LC90 values ranging from 0.44 to 5.97 and 1.64-43.36μg/ml, respectively for different instars. Ovicidal bioassays yielded EC50 and EC90 values of 18.82 and 69.61μg/ml. The study further revealed ovipositional deterrent and chemosterilant activities of the extract on the target mosquito. Bioassays using solar radiation and heat treated samples of the active fraction have showed toxicity levels similar to those of fresh sample. Chemical analysis of acetone soluble fraction of seed extract of A. squamosa has reveled ethyl oleate and iso-octyl phthalate as major components. Adulticidal, larvicidal, ovicidal, ovipositional deterrent and chemosterilant activities of the fraction on A. albopictus were proved. The investigation further confirmed stability of the active fraction on exposure to solar radiation and high temperature. © 2011 Elsevier Inc. Source

Premkumar H.B.,Acharya Institute of Technology | Premkumar H.B.,Tumkur University | Nagabhushana H.,Tumkur University | Sharma S.C.,Chattisgarh Swamy Vivekananda Technological University | And 4 more authors.
Journal of Alloys and Compounds | Year: 2014

A series of Eu3+ (1-6 mol%) activated YAlO3 nanophosphors have been synthesized by a low temperature solution combustion method using ODH fuel. The structural, morphological, thermo and photoluminescent properties are studied. Powder X-ray diffraction patterns indicate that the phosphors are orthorhombic phase of YAlO3 with small traces of Y3Al5O12 phase. Scanning Electron micrographs show the crystallites are fused together to form dumbbell shape. Transmission Electron micrograph shows the crystallites are nano size in the range 30-45 nm. Photoluminescence studies of Eu doped YAlO3 showed orange red emission (CIE co-ordinates x = 0.645, y = 0.353) due to the 5D0→7Fj (j = 0, 1, 2, 3, 4) transitions of Eu3+ ions. The concentration quenching occurs at x = 5 mol%. YAlO3:Eu3+ (5 mol%) exhibit two thermoluminescence (TL) glow peaks around 229 and 324 C respectively. TL response with different γ-doses show a good linear response and low fading suggesting that Eu 3+ activated YAlO3 is suitable for radiation dosimetry applications. The kinetic parameters (E, b, s) are estimated using peak shape method and discussed in detail. © 2014 Elsevier B.V. All rights reserved. Source

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