Kannan T.,Kumaraguru College of Technology
International Journal of Advanced Manufacturing Technology | Year: 2010
Weld cladding is a process of depositing a thick layer of a corrosion resistance material over carbon steel plate to improve the corrosion resistance properties. The main problem faced in stainless steel cladding is the selection of process parameters for achieving the required clad bead geometry and its shape relationships. This paper highlights an experimental study carried out to develop mathematical models to predict clad bead geometry and its shape relationships of austenitic stainless steel claddings deposited by gas metal arc welding process. The experiments were conducted based on four-factor, five-level central composite rotatable design with full replication technique. The mathematical models were developed using multiple regression method. The developed models have been checked for their adequacy and significance. The direct and interaction effects of process parameters on clad bead geometry and its shape relationships are presented in graphical form. © Springer-Verlag London Limited 2009.
Senthilkumar B.,Kumaraguru College of Technology
Measurement: Journal of the International Measurement Confederation | Year: 2015
The welding heat input plays a significant role in determining the microstructure and composition of the super duplex stainless steel cladding. The welding process is represented in the form of mathematical models developed using response surface methodology. The models were then used to predict the weld bead characteristics with reasonable accuracy. In this work, the models were developed to relate the identified important process parameters like welding voltage, wire feed rate, welding speed, nozzle to plate distance and welding gun angle with bead geometry. The models found to satisfy the adequacy requirements. It was found that reinforcement form factor was influenced by the factors arc length, torch travel speed, melting rate and resistance heating of the electrode. In the same way penetration form factor is influenced by the arc length, torch travel speed and arc force at the weld puddle. Contact angle influenced by the melting rate and resistance heating of the electrode. © 2014 Elsevier Ltd. All rights reserved.
Prakash C.,Salem College |
Ramakrishnan G.,Kumaraguru College of Technology
International Journal of Thermophysics | Year: 2013
The effect of the linear density, loop length, and blend proportion on thermal comfort properties (air permeability, thermal conductivity, thermal resistance, and water-vapor permeability) have been studied. Cotton, bamboo fiber, and blends of the two fibers (100 % cotton, 50:50 % bamboo/cotton, 100 % bamboo) were spun into yarns of linear densities (20s,; 25 s, 30s Ne). Each of the yarns so produced was converted to single jersey knitted fabrics with three loop lengths. The thermal conductivity of the fabrics was generally found to decrease with an increase in the proportion of bamboo fiber. The water-vapor permeability and air permeability of the fabrics were observed to increase with an increase in bamboo fiber content. An increasing presence of bamboo fiber in the fabric causes a reduction in the fabric thickness and mass per unit area for all linear densities of yarn. As the constituent yarn gets finer, both the fabric air and water-vapor permeability increase while the thermal conductivity decreases. © 2013 Springer Science+Business Media New York.
Senthilnathan V.,Kumaraguru College of Technology |
Ganesan S.,Government College of Technology, Coimbatore
Journal of Renewable and Sustainable Energy | Year: 2010
In the area of photovoltaic, the silicon solar cell is the most popular and it has issues such as stability and scaling up cost. On the other hand, a dye-sensitized solar cell (DSSC) is one of the most promising candidates for a high-performance solar cell in the next generation, since it is fabricated by a simple manufacture process at relatively low cost. The focus of interest in this research paper is to mention the usage of maiden single and simple apparatus of spray pyrolysis thin film deposition to fabricate the electrode and counterelectrode for DSSC. It involves the novelties introduced in the instrumentation of the apparatus and the characterizations (x-ray diffraction, scanning electron microscope, and atomic force microscopy) of the prepared thin films for the fabricated DSSC. In this work, the pomegranate fruit dye is used to sensitize the nano- TiO2. © 2010 American Institute of Physics.
Kumar V.V.,Kumaraguru College of Technology |
Rapheal V.S.,Kumaraguru College of Technology
Applied Biochemistry and Biotechnology | Year: 2011
Aryl alcohol oxidase (AAO) is an extracellular flavoenzyme involved in lignin degradation by white rot fungi. Screening of lignolytic and AAO activity from twenty different fungal species were carried out. Among them, seven species showed lignolytic activity and three of them (Pleurotus ostreatus, Pleurotus eous, and Pleurotus platypus) were found to be AAO positive. Maximal AAO activity was observed in batch cultures of P. ostreatus and was found to be induced by aromatic amino acids and aryl alcohols up to a level of 289 U/l. Purification of AAO was carried out by three-phase partitioning (TPP). The 67 kDa enzyme was purified up to 10.19-fold by TPP with an overall recovery of 10.95%. Optimum pH and temperature for P. ostreatus AAO activity was found to be around 6 and 40°C, respectively. From the LB plot, Km value of AAO for oxidizing veratryl alcohol was determined to be 0.6 mM. Results of the study indicate that P. ostreatus is the best producers of AAO, and they could be employed as promising fungal species for biotechnological applications. © 2010 Springer Science+Business Media, LLC.
Rao J.S.,Kumaraguru College of Technology
Mechanism and Machine Theory | Year: 2015
This paper is written in honor of Professor Dr. F. R. Erskine Crossley, Professor Emeritus, Architect and Founder Member of the International Federation for Promotion of Theory of Mechanisms and Machines (IFToMM) and its first Vice President on his achieving 100 years of age on 21st July 2015 with glorious service to Kinematics and Kinetics Community of the world. This paper deals with two parts viz., 1. My association with him in the 1960's during the formation of IFToMM and 2. Kinematics and Kinetics, the way this subject is developed in the second half of the 20th century and practiced today; a subject matter very close to Professor Crossley's heart. © 2014 Elsevier Ltd. All rights reserved.
Ramyaa P.,Bharathiar University |
Krishnaswamy R.,Kumaraguru College of Technology |
Padma V.V.,Bharathiar University
Biochimica et Biophysica Acta - General Subjects | Year: 2014
Background Ochratoxin A (OTA), a mycotoxin, causes extensive cell damage, affecting liver and kidney cells. OTA toxicity is fairly well characterized where oxidative stress is believed to play a role, however, the sequence of molecular events after OTA-exposure, have not been characterized in literature. Further, antidotes for alleviating the toxicity are sparsely reported. The aim of this study was to understand the sequence of some molecular mechanisms for OTA-induced toxicity and the cytoprotective effect of quercetin on OTA-induced toxicity. Methods Time course studies to evaluate the time of intracellular calcium release and ROS induction were carried out. The time of activation and induction of two key redox- sensitive transcription factors, NF-κB and Nrf-2 were determined by nuclear localization and expression respectively. The time of expression of inflammatory marker COX-2 was determined. Oxidative DNA damage by comet assay and micronucleus formation was studied. The ameliorative effect of quercetin on OTA-induced toxicity was also determined on all the above-mentioned parameters. Results OTA-induced calcium release, ROS generation and activated NF-κB nuclear translocation and expression. Pre-treatment with quercetin ameliorated ROS and calcium release as well as NF-κB induction and expression. Quercetin induced Nrf-2 nuclear translocation and expression. Quercetin's anti-inflammatory property was exhibited as it down regulated COX-2. Anti-genotoxic effect of quercetin was evident in prevention of DNA damage and micronucleus formation. Conclusion Quercetin modulated OTA-induced oxidative stress and redox-signaling in HepG2 cells. General significance The results of the study demonstrate for the first time that quercetin prevents OTA-induced toxicity in HepG2 cells. © 2013 Elsevier B.V.
Vinoth Kumar V.,Kumaraguru College of Technology
African Journal of Biotechnology | Year: 2010
This research provides detailed systematic study of the effect of different inducers (hesperidin, naringenin, naringin, rhamnose and rutin) in naringinase production by Aspergillus niger MTCC 1344. Cultures were carried out in shake flasks and they produce extracellular naringinase in a complex (molasses, peptone and salts) medium. The optimized concentration (%) of naringin, rhamnose, naringenin, rutin and hesperidin for maximized naringinase production are 0.1, 0.375, 0.01, 0.2 and 0.2, respectively. Compared with control, inducers increased the naringinase production by many folds in the order of naringin (6.63) > rhamnose (4.87) > naringenin (3.26) > rutin (2.84) > hesperidin (2.35). Under optimum conditions, about 9.68 units of enzyme per ml complex medium containing naringin were obtained on the 7th day. The activity to inducer (A/I) ratio was 968 Ug-1 naringin, and the cultivation time was shorter in submerged production. The results indicate that naringinase activity used naringin as an inducer which was significantly higher than the other four inducers. Therefore naringin is recommended for naringinase production. © 2010 Academic Journals.
Rao J.S.,Kumaraguru College of Technology
Procedia Engineering | Year: 2016
With the advent of high performance computing the approximate engineering approach of 20th century has given way to Science to Engineering approach directly from 17th century to 21st century. The concept of simultaneous design and optimization that began with Science Revolution with Brachistochrone Problem has helped in achieving optimum designs from the concept particularly in complex aeronautical structures. This paper describes through some examples the way in which aircraft structural designs can be produced in a short period of time using SBES approach through HPC. Concept design of an aircraft wing given the loads and the airfoil shape from CFD Achieving a composite structure through optimization principles Impact analysis from bird hits Fluid Structure Interaction and flutter analysis Engine-Wing integrated structure analysis attempts. © 2016 The Authors.
Shanmugaprakash M.,Kumaraguru College of Technology |
Sivakumar V.,Kongu Engineering College
Bioresource Technology | Year: 2013
In the present work, the evaluation capacities of two optimization methodologies such as RSM and ANN were employed and compared for predication of Cr(VI) uptake rate using defatted pongamia oil cake (DPOC) in both batch and column mode. The influence of operating parameters was investigated through a central composite design (CCD) of RSM using Design Expert 188.8.131.52 software. The same data was fed as input in ANN to obtain a trained the multilayer feed-forward networks back-propagation algorithm using MATLAB. The performance of the developed ANN models were compared with RSM mathematical models for Cr(VI) uptake rate in terms of the coefficient of determination (R2), root mean square error (RMSE) and absolute average deviation (AAD). The estimated values confirm that ANN predominates RSM representing the superiority of a trained ANN models over RSM models in order to capture the non-linear behavior of the given system. © 2013 Elsevier Ltd.