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Manu S.,Sri Siddhartha Institute of Technology | Chandrashekar T.K.,Mangalore Institute of Technology and Engineering
International Journal of Ambient Energy | Year: 2017

The study attempts to optimise the parameters of a lithium bromide–water (LiBr–H2O) miniature absorption refrigeration system using Taguchi approach for electronic cooling working at ambient conditions. Thermodynamic optimisation was performed to obtain the optimum coefficient of performance (COP) for heat removal of 100 W by using the Taguchi approach. Three factors were considered: generator temperature (Tg), condenser temperature (Tc) and absorber temperature (Ta), at three different levels. The result showed that the percentage contribution of generator temperature is more on COP. Optimisation of three significant heat exchangers: evaporator, condenser and absorber, was performed by using the Taguchi approach. The study was carried out individually for all the components by varying the hydraulic diameter and aspect ratio at three different levels. The results showed that the hydraulic diameter contributes more than the aspect ratio. © 2017 Informa UK Limited, trading as Taylor & Francis Group

Puttappa N.,Mangalore Institute of Technology and Engineering
Proceedings of International Conference on Computational Intelligence, Modelling and Simulation | Year: 2012

The present Indian Technical Education needs to adopt to the rapidly changing technological changes and bridge the gap between academics and Industry needs. With the ever changing expectations of the learner, we need to adapt to the technology to a larger extent to share knowledge. Knowledge sharing using technology is the need of the hour today. Institutes will have the best resources with lot of skills and experience. This resulting knowledge has to be stored and managed effectively resulting in a vast knowledge bank. Retrieving the tacit knowledge of the teachers of the Institute will always be a big challenge. Knowledge, being the most important resource needs to be managed effectively. Knowledge Management not only retrieves and stores the existing knowledge but also supports the growth of new knowledge. Most educational institutions have some type of Information systems in place to store knowledge, but there is lot of barriers that makes the sharing of knowledge difficult. There should be a proper framework to store assimilate and share knowledge in an institution. To cater to the knowledge needs of the institution, a framework for the knowledge management is designed. This system is designed keeping in mind the requirements of an Indian Technical Institute. This system will be used for creating, assimilating, sharing and overall Knowledge Management of an Institution. © 2012 IEEE.

Manu S.,Sri Siddhartha Institute of Technology | Chandrashekar T.K.,Mangalore Institute of Technology and Engineering
Applied Mechanics and Materials | Year: 2014

In this investigation, a thorough thermodynamic analysis of the water/lithium bromide absorption refrigeration cycle in the absence of solution heat exchanger is performed. The influence of operating temperature on the thermal loads of components, COPc (Carnot Coefficient of Performance), COPE (Enthalpy based Coefficient of Performance) and efficiency ratio (η) is studied. It is concluded that the COPc and COPE values decreases with increasing condenser and absorber temperature but increase with increasing generator and evaporator temperatures. © (2014) Trans Tech Publications, Switzerland.

Ganapayya B.,SDM College | Jayarama A.,Mangalore Institute of Technology and Engineering | Sankolli R.,Indian Institute of Science | Hathwar V.R.,Indian Institute of Science | Dharmaprakash S.M.,Mangalore University
Journal of Molecular Structure | Year: 2012

3-(2,3-Dimethoxyphenyl)-1-(pyridin-2-yl)prop-2-en-1-one (DMPP) a potential second harmonic generating (SHG) has been synthesized and grown as a single crystal by the slow evaporation technique at ambient temperature. The structure determination of the grown crystal was done by single crystal X-ray diffraction study. DMPP crystallizes with orthorhombic system with cell parameters a = 20.3106(8) , b = 4.9574(2) , c = 13.4863(5) , α = 90°, β = 90°, γ = 90° and space group Pca2 1. The crystals were characterized by FT-IR, thermal analysis, UV-vis-NIR spectroscopy and SHG measurements. Various functional groups present in DMPP were ascertained by FTIR analysis. DMPP is thermally stable up to 80 °C and optically transparent in the visible region. The crystal exhibits SHG efficiency comparable to that of KDP. © 2011 Elsevier B.V. All rights reserved.

Rao A.,Mangalore Institute of Technology and Engineering | Krishnan S.,Mangalore University | Sajeev G.,Mangalore University | Siddappa K.,JSS Foundation for Science and Society
Pramana - Journal of Physics | Year: 2010

GaAs solar cells hold the record for the highest single band-gap cell eficiency. Successful application of these cells in advanced space-borne systems demand characterization of cell properties like dark current under different ambient conditions and the stability of the cells against particle irradiation in space. In this paper, the results of the studies carried out on the effect of 8 MeV electron irradiation on the electrical properties of GaAs solar cells are presented. The I-V (current-voltage) characteristics of the cells under dark and AM1.5 illumination condition are studied and 8 MeV electron irradiation was carried out on the cells where they were exposed to graded doses of electrons from 1 to 100 kGy. The devices were also characterized using capacitance measurements at various frequencies before and after irradiation. The effect of electron irradiation on the solar cell parameters was studied. It is found that only small changes were observed in the GaAs solar cell parameters up to an electron dose of 100 kGy, exhibiting good tolerance for electrons of 8 MeV energy. © Indian Academy of Sciences.

Bhat P.S.,Mangalore Institute of Technology and Engineering | Rao A.,Mangalore Institute of Technology and Engineering | Krishnan S.,Sri Devi Institute of Technology | Sanjeev G.,Mangalore University | Puthanveettil S.E.,Satellite Center
Solar Energy Materials and Solar Cells | Year: 2014

This paper reports on the photon and 8 MeV electron irradiation effects on electrical parameters, quantum efficiency and minority carrier lifetime of a c-Si solar cell. The effect of subsequent photon irradiation on the silicon solar cells, degraded by 8 MeV electron irradiation is also investigated. The current-voltage (I-V) characteristics of solar cells under AM0 illumination condition were studied before and after the irradiation. The solar cell parameters such as short circuit current (Isc), open circuit voltage (Voc), fill factor (FF), and conversion efficiency (η) were found to decrease after electron irradiation. A slight improvement in the electric performance of solar cells is observed after the photon irradiation. The spectral response shows that the quantum efficiency for low energy photons is reduced, suggesting that the damage is mainly inflicted to the bulk of the absorber material. This is strongly supported by the minority carrier lifetime results, which show a clear trend of decreasing carrier lifetime and carrier diffusion length as radiation dose increases. © 2013 Elsevier B.V.

Sathyanarayana Bhat P.,Mangalore Institute of Technology and Engineering | Rao A.,Bangalore University | Sanjeev G.,Mangalore University | Usha G.,Satellite Center | And 3 more authors.
Radiation Physics and Chemistry | Year: 2015

The space grade silicon solar cells were irradiated with 8MeV electrons with doses ranging from 5-100kGy. Capacitance and conductance measurements were carried out in order to investigate the anomalous degradation of the cells in the radiation harsh environments and the results are presented in this paper. Detailed and systematic analysis of the frequency-dependent capacitance and conductance measurements were performed to extract the information about the interface trap states. The small increase in density of interface states was observed from the conductance-frequency measurements. The reduction in carrier concentration upon electron irradiation is due to the trapping of charge carriers by the radiation induced trap centres. The Drive Level Capacitance Profiling (DLCP) technique has been applied to study the properties of defects in silicon solar cells. A small variation in responding state densities with measuring frequency was observed and the defect densities are in the range 1015-1016cm-3. © 2015 Elsevier Ltd.

Gupta A.,Graphic Era University | Chetty N.,Mangalore Institute of Technology and Engineering | Shukla S.,Galgotias University
2015 International Conference on Computing, Communication and Security, ICCCS 2015 | Year: 2015

The rapid computerization and advancement in the technology has led to huge amount of data in the databases. Research has shown that the amount of data in the world doubles in every 20 months. However, this available data consists of large number of noise values and thus, cannot be directly used. The extraction of information from the vast pool of data has emerged a major challenge. © 2015 IEEE.

Durga Prasanna M.,Mangalore Institute of Technology and Engineering | Roopa S.R.,Mangalore Institute of Technology and Engineering
Souvenir of the 2015 IEEE International Advance Computing Conference, IACC 2015 | Year: 2015

Network of things is expanding day by day, with that security, flexibility and ease of use became concern of the user. We do have a different technique to full fill user's demands. Some of them are: Single Sign On (SSO), Cryptography techniques like RSA-VES, Serpent etc. In this paper an effort is made to provide all mentioned facilities to the user. Single Sign On (SSO) authorizes user only once and allow user to access multiple services and make the system very easy to use and also provides flexibility to use multiple programs or applications. The combination of cryptographic algorithms: Serpent (symmetric encryption) and RSA-VES (asymmetric encryption) which are known as one of the secured cryptographic algorithms are used with 'session time' which makes communication very secure and reliable. © 2015 IEEE.

Rajesh Shetty K.,National Institute of Technology Karnataka | Sripati U.,National Institute of Technology Karnataka | Prashantha Kumar H.,National Institute of Technology Karnataka | Shankarananda B.,Mangalore Institute of Technology and Engineering
2010 5th International Conference on Industrial and Information Systems, ICIIS 2010 | Year: 2010

Flash memories have found extensive application for use in portable storage devices. They have been used for code storage as well as data storage. The storage density associated with these devices has increased tremendously in the past few years. This has necessitated very dense packing of data bits on the device. This gives rise to increased Raw Bit Error Rate (RBER) as a result of Inter Symbol Interference (ISI) between bits stored in adjacent cells. This necessitates the use of powerful error control codes to guarantee information integrity. With the increase in density of data storage, the raw bit error rate (RBER) associated with the storage device increases. Error Control Coding (ECC) can be used to reduce the RBER to acceptable values so that these devices can be employed to store information in applications where data corruption is unacceptable. In this paper, we describe the synthesis of BCH codes based on memory models proposed by the semiconductor industry. These codes have better error correcting capability than the codes used in current practice. ©2010 IEEE.

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