Senthil R.,Arunai Engineering College
Applied Mechanics and Materials | Year: 2014
This paper investigates the effects of heat treatment on tensile strength and microstructure of AZ61A magnesium alloy. Magnesium alloys usually are heat treated either to improve mechanical properties or as means of conditioning for specific fabrication operations. The AZ61A Mg alloy was solution heat treated at the temperature of 650°F (343°C) for various soaking time (120, 240, and 360 minutes) and was allowed to cool slowly in the furnace. Special attention had been focused on the analysis of mutual relations existing between the deformation conditions, microstructural parameters, grain size, and the mechanical properties. The result after the solution heat treatment showed improved hardness, tensile strength, and yield strength. © (2014) Trans Tech Publications, Switzerland.
Chellatamilan T.,Arunai Engineering College |
Suresh R.M.,Sri Muthukumaran Institute of Technology
Life Science Journal | Year: 2013
With the advent of internet technology as a ubiquitous platform for sharing the educational contents and experiences, many of the institutions across the globe offer the federated search to the courses, lesson plans, contents, assignments, seminars and experiments. These learning resources are stored in the repositories of the learning content management system. Sophisticated search and information retrieval solutions are essential for efficient use of these repositories. The structure of many existing information retrieval system considers ontology for retrieval. This ontology based solution increases the accuracy of information retrieval through high precision and recall. This paper addresses the requirement for pre-processing and classification of documents in order to achieve more efficient Information Retrieval system. Tools and techniques employed for autonomous classification or clustering of documents are investigated and a new method based on concept expansion is proposed. The proposed methods are evaluated using Reuters 21578 dataset.
Balamurugan C.R.,Arunai Engineering College |
Natarajan S.P.,Annamalai University |
Shanthi B.,Annamalai University
International Review of Electrical Engineering | Year: 2013
This paper presents the comparison of unipolar multicarrier Pulse Width Modulation (PWM) techniques for the Cascaded Multi Level Inverter (CMLI). Due to switch combination redundancies, there are certain degrees of freedom to generate the five level AC output voltage. This paper presents the use of Control Freedom Degree (CFD) combination. The effectiveness of the PWM strategies developed using CFD are demonstrated by simulation and experimentation. The simulation results indicate that the chosen five level inverter triggered by the developed UISCPSPWM and UISCVFPWM strategy with sine and stepped wave references and UISCAPODPWM strategy with THI PWM and 60 degree reference exhibis reduced harmonics. UISCCOPWM provides higher fundamental RMS output voltage for all four chosen references. PWM strategies developed are implemented in real time using dSPACE/Real Time Interface (RTI). The simulation and experimental outputs closely match with each other validating the strategies presented. © 2013 Praise Worthy Prize S.r.l. - All rights reserved.
Ranganathan S.,Arunai Engineering College |
Kalavathi M.S.,JNTUH College of Engineering |
Christober Asir Rajan C.,Pondicherry Engineering College
IET Generation, Transmission and Distribution | Year: 2016
The efficient operation of the present day power system is an important issue to satisfy the customer needs. To improve the performance of the existing power system, the flexible alternating current transmission system (FACTS) devices have been attracted by an engineering community with the expertise in power system. This article proposes the self-adaptive firefly algorithm (SAFA) for placement of FACTS devices, which identifies the appropriate type, best possible locations and optimal parameters of FACTS devices. Static var compensator, thyristor controlled series compensator and unified power flow controller are considers as FACTS devices for their placement. The objectives are to improve the power system performance by placement of FACTS devices through minimising real power loss, improving voltage profile and enhancing the voltage stability. Effectiveness of the proposed SAFA is tested on standard IEEE 30 and IEEE 57 bus systems with different objectives. The results are compared with other approaches, which clearly indicate the effectiveness and usefulness of the proposed method. © The Institution of Engineering and Technology 2016.
Bharathiraja B.,HIGH-TECH |
Chakravarthy M.,HIGH-TECH |
Kumar R.R.,HIGH-TECH |
Yuvaraj D.,HIGH-TECH |
And 3 more authors.
Renewable and Sustainable Energy Reviews | Year: 2014
The indiscriminate extraction and consumption of fossil fuels have left the world with a corner kick into the area of exponential fuel demand and now the race is on for alternate energy source. The fortunate improvements in Biodiesel fuel production techniques has been the heading topic of economic and environment sustainability so far. Biodiesel have the potential to replace diesel in vehicle engines. It has been tested and proved that engines running on biodiesel have shown low smoke emission and low toxic gas emission. Biodiesel properties such as oxidation stability, cloud point, iodine value, linoleic acid and poly-unsaturated fatty acid methyl ester content of biodiesel are dependent upon the quality of the feedstock. Processing parameters such as density, viscosity, acid value, distillation property are dependent on feedstock as well as the reaction conditions or the extent of reaction. Combustion property greatly varies with the substrates used and almost all the varieties have been proven to be as superior as that of conventional diesel fuel. Though the existing fossil and terrestrial biomass based oil cannot realistically satisfy the existing demands, algal oil source scores the most out of demanded factors like oil content, extractability, comfortable cultivation and efficient biomass production. Algae are a diverse group of plant like microorganisms, prokaryotic and eukaryotic, mostly autotrophic in nature with basic requirement such as CO2 and light for their normal growth and metabolic activity. Being micro scaled in physiology, most species of algae have less doubling time and the oil productivity greatly exceeds the outcome of best oil producing crops which clearly portrays that microalgae acts as a renewable source and can yield enough amount of oil for biodiesel production to meet the present intensifying demands. This article aims at reviewing the technical aspects of various biodiesel production methods from diverse oil feedstocks, their importance and significance of microalgal, process availability, commercialization potential of various processes. © 2014 Elsevier Ltd.
Ragupathy S.,Salem College |
Sathya T.,Arunai Engineering College
Journal of Materials Science: Materials in Electronics | Year: 2016
Tin oxide (SnO2) nanoparticles were synthesized and loaded on groundnut shell activated carbon (SnO2/GNSAC) using by a chemical precipitation method and its photocatalytic activity was evaluated by photodegradation of methylene blue under sunlight radiation. The synthesized products were characterized by X-ray diffraction analysis, diffusion reflectance spectra show the optical properties and confirmation made by photoluminescence, Fourier transform infrared spectroscopy, scanning electron microscopy with energy dispersive X-ray and nitrogen adsorption–desorption technique. The various experimental parameters like amount of catalyst, initial pH and contact time for efficient dye degradation of methylene blue were concerned in this study. In the photodegradation of methylene blue, a significant increase in the reaction rate was observed with SnO2/GNSAC under sunlight. This increase is due to the high migration efficiency of photoinduced electrons and the inhibition of charge–carrier recombination due to the electronic interaction between SnO2 and GNSAC. © Springer Science+Business Media New York 2016.
Jayakumar L.,Arunai Engineering College |
Balamurugan K.,Indian Institute of Road and Transport Technology |
Ezilarasan C.,SMK Fomra Institute of Technology
International Review of Mechanical Engineering | Year: 2014
The wear and friction behaviour of 7075 Al-25(wt %) SiC particle composite were investigated at a speed range of 3 to 9 m/s and load range of 30 to 110 N using pin-on-disc wear testing machine. In this work, the automobile friction material was used as pin and the composite as counter face and the results were compared with the commercially used cast iron brake disc. The results show that the wear rate of the Al MMC disc was less than that of the conventional cast iron disc. The coefficient of friction decreases with increase of applied load for both cast iron and Al MMC materials. However, the friction coefficient of Al MMC is higher than that of the cast iron. In all tests it is observed that the wear rate of friction material was more when sliding against MMC disc because of the abrasive action of fractured and pulled out SiC particles. The wear grooves formed on the cast iron disc, MMC disc and friction material have been analysed using optical micrographs and X- ray diffraction (XRD) technique. © 2014 Praise Worthy Prize S.r.l. - All rights reserved.
Lakshmipathy J.,Arunai Engineering College |
Kulendran B.,Indian Institute of Road and Transport Technology
International Journal of Refractory Metals and Hard Materials | Year: 2014
In the present study, the reciprocating wear behavior of 7075Al/SiC composites and 6061Al/Al2O3 composites that are prepared through liquid metallurgy route is analyzed to find out the effects of weight percentage of reinforcement and load at the fixed number of strokes on a reciprocating wear testing machine. The Metal Matrix Composite (MMC) pins are prepared with different weight percentages (10, 15 and 20%) of SiC and Al 2O3 particles with size of 36 μm. Hardness of these composites increases with increase in wt.% of reinforcement. However, the impact strength decreases with increase in reinforcement content. The experimental result shows that the volume loss of MMC specimens is less than that of the matrix alloy. However, the volume loss is greater in 6061Al/Al2O 3 composites when compared to 7075Al/SiC composites. The temperature rise near the contact surface of the MMC specimens increases with increase in wt.% of reinforcement and applied load. The coefficient of friction decreases with increase in load in both cases. © 2014 Elsevier Ltd.
Ragupathy S.,ERK Arts and Science College |
Sathya T.,Arunai Engineering College
Journal of Materials Science: Materials in Electronics | Year: 2016
Zinc sulfide (ZnS) NPs were synthesized and loaded on Pongamia pinnata shell activated carbon (ZnS/PPSAC) using by a chemical precipitation method and its photocatalytic activity was evaluated by photodegradation of Rhodamine B (RhB) under sunlight irradiation. The synthesized products were characterized by X-ray diffraction, UV–Visible spectroscopy, photoluminescence, Fourier transform infrared spectroscopy, scanning electron microscopy with energy dispersive X-ray and N2-sorption BET surface area for their structures, band gaps, emission, hydroxyl groups, morphology and specific surface area. The various experimental parameters like amount of catalyst and contact time for efficient dye degradation of RhB were investigated. They ZnS/PPSAC revealed that the exhibit higher photodegradation efficiency via synergistic effect for other catalytic systems. This result is attributed to the increase of the separation of photogenerated electron–hole pairs on the surface of ZnS/PPSAC. © 2016 Springer Science+Business Media New York
Anbukodi S.,Arunai Engineering College |
Muthu Manickam K.,Arunai Engineering College
2011 International Conference on Emerging Trends in Electrical and Computer Technology, ICETECT 2011 | Year: 2011
To search any information on the web users extensively use the search engines. As the growth of the World Wide Web exceeded all expectations, the search engines rely on web crawlers to maintain the index of billions of pages for efficient searching. The web crawlers have to interact with millions of hosts and retrieve the pages continuously to keep the index up-to-date. It is reported in the literature that the 40% of the current Internet traffic and bandwidth consumption is due to these crawlers. These crawlers also cause load on the remote server by using its CPU cycles and memory. In addition, I/O performance, network resources, and OS limits must be taken into account in order to achieve high performance at a reasonable cost. This paper address all those problems by proposing a system based on mobile crawlers using mobile agent. The proposed approach employs mobile agents to crawl the pages. These mobile crawlers identify the modified pages at the remote site without downloading them instead it downloads those pages only, which have actually been modified since last crawl. Hence it will reduce the Internet traffic and load on the remote site considerably. This system can be implemented by the help of java aglets. © 2011 IEEE.