Modi K.B.,Saurashtra University |
Shah S.J.,Darshan Institute of Engineering and Technology |
Pujara N.B.,Saurashtra University |
Pathak T.K.,Government Engineering College |
Jhala I.G.,Saurashtra University
Journal of Molecular Structure | Year: 2013
This communication presents the effect of high energy ball milling induced strain and grain size reduction on Infrared spectral evolution, elastic, optical and thermodynamic properties of un-milled and 3, 6 and 9 h. milled samples of spinel ferrite composition, Ni0.5Zn0.5Fe2O4, studied by means of X-ray powder diffractometry and infrared spectroscopy measurements at 300 K. A simple approach is used for force constants determination and found to be quite satisfactory. The elastic moduli, elastic wave velocities, Debye temperature, threshold energy, molar heat capacity, refractive index, reflectivity, jump rate of charge carriers for the ferrites have been determined and they are found to vary in accordance with variation of lattice constant and milling induced strain as a function of milling time. No effect on the elastic parameters is observed due to milling induced grain size reduction. Elastic constants calculated using the relation, Ko = (60 + 490 * SN) and heterogeneous metal mixture rule are in agreement with those determined from IR and XRD patterns analysis, validates the applicability of these approaches. The lattice energy for polycrystalline ferrite materials and single crystalline counterpart as well as electronic contribution to molar heat capacity has been calculated. © 2013 Elsevier Ltd. All rights reserved.
Dave D.K.,Government Engineering College |
Murugesh R.,Darshan Institute of Engineering and Technology |
Devadasan S.R.,PSG College of Technology
International Journal of Services and Operations Management | Year: 2015
In this paper, a literature review conducted for the purpose of tracing the origin of Lean Six Sigma (LSS) concept and examining its principles and applications are reported. This literature review was begun by gathering research papers reporting review on LSS. On reviewing these papers, it was found that, these papers deal with as many as seven issues concerning the LSS. Maximum numbers of papers were found to deal with the areas and sectors of implementing LSS are minimum in number. The review of these papers has indicated that LSS encompasses the principles, tools and techniques of Lean and Six Sigma concepts. Because of the integration of these two concepts, the number of tools and techniques used while implementing LSS is very high. Hence, tactical selection of a set of tools plays a vital role in successfully implementing LSS in organisation. This observation implies that several frameworks are necessary for successfully implementing LSS in several sectors. Although LSS has found wide applications, it is yet to find applications in certain sectors. In the context of these observations, this paper is concluded by appraising the future researchers to conduct case studies in organisations and sectors which are slow in implementing LSS implementation and to evolve sector-specific LSS implementation models. Copyright © 2015 Inderscience Enterprises Ltd.
Dobaria B.,Darshan Institute of Engineering and Technology |
Pandya M.,Visveswaraya National Institute of Technology |
Aware M.,Visveswaraya National Institute of Technology
Energy | Year: 2016
The analytical assessment of 5.05 kWp grid tied photovoltaic plant performance on the system level has been carried out in this study. The solar PV plant has been installed on the roof of the block-A of the Darshan Institute of Engineering and Technology, Rajkot. India. The Darshan Institute of Engineering and Technology has been monitoring and recording all the parameters of 5.05 kWp grid tied solar PV power plant for 3 years. This paper helps in study of the performance and consistency of this system. The final yield, reference yield and performance ratio are observed to vary from 2.96 h/d to 5.43 h/d, 4.22 h/d to 7.29 h/d and 68%-83% respectively. The global in-plane solar radiation at the city of Rajkot is 2212 kWh/m2/annum. The average annual measured energy yield of the plant is found to be 1636 kWh/kWp. The total estimated system losses due to irradiance angle, temperature, module quality, array and cell mismatch, AC/DC wiring, MPPT, soiling and dirt, and inverter are found to be 26%. As a whole, the location, soiling pattern, design of PV and maintenance of solar PV system are the primary reasons of energy variability and system energy production. © 2016 Elsevier Ltd.
Murali S.,PSG College of Technology |
Shanmugam S.V.,PSG College of Technology |
Prasaad G.A.,PSG College of Technology |
Kumar M.S.,PSG College of Technology |
And 3 more authors.
International Journal of Advanced Manufacturing Technology | Year: 2014
This paper reports a research in which a setup was developed to determine the optimal values of ergonomic positional parameters that would mitigate the development of fatigue while performing massage therapy. This setup was based on virtual instrumentation principles and consisted of a sphygmomanometer bulb, an air sac, a pressure sensor, a data acquisition card and a personal computer installed with the Laboratory Virtual Instrumentation Engineers Workbench software (LABView software). The air sac fitted in this setup is equalised with the muscles and other human body parts which a human therapist is required to press while performing massage therapy. After constructing the air sac fatigue monitoring virtual instrumentation setup, 25 participants who were not actually massage therapists were asked to press the air sac to mimic the behaviour of the massage therapists during the time of their works. After drawing necessary data by performing this activity and by entering the data in Minitab 16 software, regression models to specify optimal values of ergonomic positional parameters were developed. These regression models were practically validated by conducting experiments involving five other participants. The method of utilizing these regression models in determining the optimum values of positional parameters that would mitigate fatigue development while performing massage therapy is illustrated by presenting two cases. While concluding, it is suggested to involve actual massage therapists for testing the performance of the fatigue monitoring virtual instrumentation setup developed during the research reported in this paper. © Springer-Verlag London 2013.
Sreenivasa C.G.,PSG College of Technology |
Devadasan S.R.,PSG College of Technology |
Murugesh R.,Darshan Institute of Engineering and Technology
International Journal of Services and Operations Management | Year: 2012
During the recent years, competition is intensified due to the globalisation and entry of several players in markets. This situation has facilitated the modern customers to demand innovative products and models in varied volumes. In order to fulfil this customer demand, it is necessary for the traditional manufacturing companies to practice agile manufacturing (AM) principles. On adoption of AM, a traditional company can exhibit agility by which it reacts quickly to meet the customers' dynamic demands. AM has to be implemented by the traditional manufacturing companies by acquiring several criteria. Some of them may not exist or may exist feebly in traditional manufacturing companies. In this situation, the traditional manufacturing companies need to assess the level at which agility is practiced. In order to fulfil this need, a 30 criteria AM assessment tool is contributed in this paper. Using this tool, the total agility level in a pneumatic enabling products manufacturing company was assessed. After a comprehensive analysis, the drag and failure factors that prevent this company from becoming agile were identified. Subsequently, the mitigating actions and success ingredients for suppressing and overcoming them were evolved and suggested as proposals. Most of these proposals were acceptable to the management of this company. © 2012 Inderscience Enterprises Ltd.