Visvesvaraya Technological University
Belgaum, India

Visvesvaraya Technological University is a collegiate public state university in Karnataka State, India. It was established on 1 April 1998 by the Government of Karnataka as per VTU Act 1994, to improve the quality of technical education in the state. Apart from a few notable exceptions, VTU has complete authority in the state of Karnataka. It is a statutory requirement for colleges offering any program in engineering or technology in the state to be affiliated with the university.The university is named after Sir Visvesvaraya from Karnataka, the only engineer to be awarded a Bharat Ratna award, the highest civilian award in India. Jnana Sangama, Belgaum is the headquarters of VTU. Additionally, the university has three regional centers located in Bangalore, Gulbarga and Mysore.VTU is one of the largest universities in India with 208 colleges affiliated to it with an intake capacity of over 67100 undergraduate students and 12666 postgraduate students. The university encompasses various technical & management fields which offers a total of 30 undergraduate and 71 postgraduate courses. The university has around 1800 PhD candidates.Presently, VTU has 13 QIP centers and 17 extension centers in its various affiliated colleges offering post graduate courses. It has around 2305 departments recognized as research centers which are spread across its various affiliated institutions in different cities of Karnataka.It is one of the few universities of India to have 16 of its affiliated colleges recognised by the World Bank for getting assistance in setting up state of art laboratories, campus facilities and research centers under the TEQIP program.The university is administered by its Executive Council and Academic Senate whose members are selected from the academic community and government officials. The present Chancellor of the university is His Excellency, Sri Vajubhai Vala, Governor of Karnataka state and the Vice-Chancellor is Dr. H. Maheshappa.The Jnana Sangama, Belgaum campus and the regional and extension centers of VTU at Bangalore, Davangere, Gulbarga and Mysore offer M.Tech, MBA, MCA and PhD programs.The University has signed MoUs with various Multinational corporation like IBM, Intel Asia Electronics Inc., Ingersoll-Rand Ltd., Bangalore, Nokia, Bosch Rexroth and Microsoft to improve the industry interactions for both students and the teachers.VTU is one of the member universities of the Association of Indian Universities and Association of Commonwealth Universities. Wikipedia.

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Shashidhara H.R.,Visvesvaraya Technological University
Proceedings of the 2016 2nd International Conference on Applied and Theoretical Computing and Communication Technology, iCATccT 2016 | Year: 2017

Automatic Test Pattern Generation (ATPG) is used to determine test input sequence for digital circuit which distinguishes for the correct and faulty circuit behavior. These circuit behavios are caused by the internal and external defects. The circuit under test (CUT) gets the input test vectors from these ATPG. This test sets are compressed to reduce the test time. Different fault models of physical defects of the circuits are facilitates test generation. The Stuck-at faults and fault transition models are extensively used because of their expediency. In this paper two methods of logic regression have been designed in order to obtain random test patterns. In static method, test patterns are generated using a characteristic polynomial, in bit separation method, test patterns are obtained by separating odd and even bits. © 2016 IEEE.

Pavitra Bai S.,Sjb Institute Of Technology | Ravi Kumar G.K.,Visvesvaraya Technological University
Proceedings of the 2016 2nd International Conference on Applied and Theoretical Computing and Communication Technology, iCATccT 2016 | Year: 2017

Mining frequent itemsets and association rules on data stream is an important and challenging task. Tree based approaches have been extensively studied and widely used for their parallel processing capability. Itemset Tree is an efficient data structure to represent the transactions for performing selective mining of frequent itemsets and association rules. The transactions are inserted incrementally and provide on-demand ad-hoc querying on the tree for fining frequent itemsets and association rules for different support and confidence values. However the size of tree grows larger for unbounded data streams limiting the scalability. In this paper, we propose an Approximation based Incremental Memory Efficient Itemset Tree (AIMEIT) algorithm which is an extension to Memory Efficient Itemset Tree (MEIT) algorithm to construct the itemset tree from data stream. The user defined minimum support of interest has been used along with Lossy counting algorithm to prune transactions before inserting them into the tree. Experimental results show that the proposed algorithm is more memory efficient and takes lesser processing time for constructing the tree. © 2016 IEEE.

In the present study, the effect of minor additions of copper (Cu) on the elevated temperature wear behaviour of A356 (Al-7Si-0.3Mg) alloy have been investigated using a high temperature pin-on-disc wear testing machine. Effect of alloy composition, normal pressures, sliding speeds and sliding distances on A356 alloy at constant temperature of 300 °C have been studied. The cast alloys and worn surfaces were characterized by SEM/EDX microanalysis. The results suggest that, the wear rate of A356 alloy increases with increase in normal pressures, sliding speeds and sliding distances in all the cases studied and decreases with 0.5%Cu addition level to the A356 alloy at the tested temperature. This is due to the partial refinement of α-Al dendrites and solid solution strengthening and precipitation hardening. The worn surface study indicates that, the formation of Fe-rich oxide layer between the mating surfaces during sliding improves tribological properties. © 2011 Elsevier B.V.

Elnaggar M.H.A.,Universiti Sains Malaysia | Abdullah M.Z.,Universiti Sains Malaysia | Abdul Mujeebu M.,Visvesvaraya Technological University
Energy Conversion and Management | Year: 2012

As part of the ongoing research on finned U-shape heat pipes for CPU cooling, the present work focuses on the characterization of working fluid in vertically oriented twin U-shape heat pipe, by taking into account the gravity of flow. Two-dimensional FE simulation is performed under natural and forced convection modes, by using ansys-flotran. The best heat input and coolant velocity for the simulations are determined experimentally, corresponding to the least thermal resistance. The wall temperatures at the evaporator, adiabatic and condenser sections, and the velocity and pressure distributions of vapor and liquid, are analyzed. The total heat input for minimum thermal resistance in both natural and forced convection is found to be 50 W, and the coolant velocity is 3 m/s. The predicted and experimental wall temperatures are found in excellent match. It is observed that for the present U-shape heat pipe configuration, the difference in evaporator and condenser temperatures is significantly small, resulting in enhanced heat transfer compared to the conventional heat pipes. The sintered copper wick has a small pore size, resulting in low wick permeability, leading to the generation of high capillary forces for anti-gravity applications. © 2012 Elsevier Ltd. All rights reserved.

Swetha S.,Visvesvaraya Technological University | Santhosh S.M.,Visvesvaraya Technological University | Geetha Balakrishna R.,Visvesvaraya Technological University
Photochemistry and Photobiology | Year: 2010

Nanostructured TiO2 crystals were synthesized by gel to crystalline conversion. The crystals obtained were anatase form of titania averaging in 30 nm particles with an intrinsic band gap of 3.1 eV. The photocatalytic behavior was evaluated for the bactericidal effect in water, contaminated with the indicator organism Escherichia coli. The 100% photoinactivation of E. coli was achieved within 60 min with suspended nano-TiO2. The catalytic activity of synthesized nanosample was observed to be 2.6 times more than that of commercial TiO2 sample referred to as Degussa P-25. The photoinactivation of E. coli was tested with irradiation source of different wavelengths to substantiate the influence of particle size and nano crystallinity on electronic band structure. The photoactivity of nano titania enhanced to 1.625 times when the source of irradiation shifted from 360 to 400 nm while Degussa P-25 showed no change.

Veerappa M.P.K.,Visvesvaraya Technological University | Venugopalachar S.,Visvesvaraya Technological University
Noise and Health | Year: 2011

Noise is a common occupational health hazard in most industrial settings. An assessment of noise and its adverse health effects based on noise intensity is inadequate. For an efficient evaluation of noise effects, frequency spectrum analysis should also be included. This paper aims to substantiate the importance of studying the contribution of noise frequencies in evaluating health effects and their association with physiological behavior within human body. Additionally, a review of studies published between 1988 and 2009 that investigate the impact of industrial/occupational noise on auditory and non-auditory effects and the probable association and contribution of noise frequency components to these effects is presented. The relevant studies in English were identified in Medknow, Medline, Wiley, Elsevier, and Springer publications. Data were extracted from the studies that fulfilled the following criteria: title and/or abstract of the given study that involved industrial/occupational noise exposure in relation to auditory and non-auditory effects or health effects. Significant data on the study characteristics, including noise frequency characteristics, for assessment were considered in the study. It is demonstrated that only a few studies have considered the frequency contributions in their investigations to study auditory effects and not non-auditory effects. The data suggest that significant adverse health effects due to industrial noise include auditory and heart-related problems. The study provides a strong evidence for the claims that noise with a major frequency characteristic of around 4 kHz has auditory effects and being deficient in data fails to show any influence of noise frequency components on non-auditory effects. Furthermore, specific noise levels and frequencies predicting the corresponding health impacts have not yet been validated. There is a need for advance research to clarify the importance of the dominant noise frequency contribution in evaluating health effects.

Katagi K.S.,Visvesvaraya Technological University | Munnolli R.S.,Visvesvaraya Technological University | Hosamani K.M.,Karnatak University
Applied Energy | Year: 2011

In this work, an attempt has been made to characterize, isolate and elucidate the structure of unusual fatty acid in the seed oil of Aegle marmelos Corre. Further, this nonedible seed oil is screened for its bio-diesel or industrial feedstock property. The Aegle marmelos Corre seeds yielded 49.0% oil. The seed oil contains 12.5% of 12-hydroxyoctadec-cis-9-enoic acid (ricinoleic acid) along with other normal fatty acids. The identification and characterization was supported by FTIR, 1H NMR, 13C NMR, MS, GC analysis and chemical degradation technique. A good agreement is seen between the calculated and experimental results of iodine value (IV) and saponification value (SV). The prominent parameters of bio-diesel such as cetane number (CN), lower heating value (LHV) and higher heating value (HHV) are deployed to envisage the quality of oil for use as bio-diesel. This seed oil is nonedible and is found to be the alternative feed stock for the production of bio-diesel since it convenes the major specifications of bio-diesel. The bio-diesel property of fatty acid methyl esters (FAMEs) of this seed oil is compared with other bio-diesels. © 2010 Elsevier Ltd.

Zakaulla M.,Visvesvaraya Technological University | Anwar Khan A.R.,Visvesvaraya Technological University
Materials Today: Proceedings | Year: 2015

In this study, the wear behavior of hybrid composite with an Al6061 matrix reinforced with copper coated silicon carbide (SiC) particles and copper coated Graphite (Gr) powder using Taguchi method was investigated. Wear tests of Al6061/Cu-10%SiC/Cu-1%Gr was carried out for a dry sliding condition in a so-called a pin-on-disc arrangement. The wear tests were conducted under the loads of 10, 20, and 40 N and sliding speeds of 0.42, 0.84 and 1.68 m/s and also sliding distance of 750, 1500 and 3000m. The obtained experimental results are transformed into a signal-to-noise (S/N) ratio of using Taguchi method. An L27 orthogonal array was employed for the experimental design. Applied load, sliding speed and sliding distance exert a great effect on the specific wear rate at 42.86%, 36.50%, and 6.42% and also on the coefficient of friction at 60.67%, 9.65% and 14.46 respectively. Regression equations were developed for both specific wear rate and coefficient of friction. Finally confirmation tests were carried out to verify the experimental results. © 2015.

Malipatil A.S.,Visvesvaraya Technological University
IFAC Proceedings Volumes (IFAC-PapersOnline) | Year: 2014

The aim of this paper is to study solid particle erosion of PMC's carbon/vinylester using L9 Orthogonal Array lay-out was used for conducting the experiments. The controllable parameters selected for the study included impingement velocity (50, 75 and 100 m/s), impact angle (45°, 60° and 75°), erodent size (200, 300 and 400μ m) and stand-off-distance (120, 180, 240 mm). S/N ratio analysis was performed to find the most influencing factor. The laminates [-55°/+55°] stacking sequence were characterized for erosion damage. Amongst the four parameters selected for the study, impingement velocity had the greatest influence on the erosion rate followed by impact angle. Erosion rates were lower at lower values of S/N ratio. This has been proved using LS-Dyna Analysis. The composite slabs are made by conventional hand-lay-up technique. © 2014 IFAC.

Suresha S.,Indian National Institute of Engineering | Suresha S.,Visvesvaraya Technological University | Sridhara B.K.,Indian National Institute of Engineering
Materials and Design | Year: 2012

Hybrid aluminum metal matrix composites reinforced with silicon carbide (SiC) and graphite (Gr) are extensively used due to high strength and wear resistance. Friction behavior of such hybrid composites is quite vital in deciding the optimal combination of SiC and Gr. The sliding friction response of stir cast hybrid aluminum composites reinforced with equal weight fraction of SiC and Gr particulates of 2.5%, 5%, 7.5% and 10% reinforcement is investigated. The influence of % reinforcement, load, sliding speed and sliding distance on friction coefficient is studied using pin-on-disk equipment with tests based on design of experiments. Hardness of the composites decreases with increase in % reinforcement. Friction coefficient is influenced by sliding speed as well as load and its average value is around 0.269. But, % reinforcement and sliding distance do not affect the friction coefficient. © 2011 Elsevier Ltd.

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