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Gupta H.,M D University | Chandrasekhar M.,Vignan Institute of Technology and Science | Krishna T.S.,Nalanda Institute of Technology | Sharma V.K.,M D University
Journal of Molecular Liquids | Year: 2017

The densities, ρ, speeds of sound, u, and molar heat capacities, CP, of 1-butyl-2,3-dimethylimidazolium tetrafluoroborate (1) + cyclopentanone or cyclohexanone (2) mixtures at 293.15, 298.15,303.15 and 308.15 K and excess molar enthalpies, HE of same mixtures at 298.15 K have been measured as a function of composition. The observed ρ, u, and CP values are used to determine excess molar volumes, VE, excess isentropic compressibilities, κS E and excess heat capacities, CP E. The analysis of VE data in terms of Graph theory has suggested that while 1-butyl-2,3-dimethylimidazolium tetrafluoroborate exists as monomer; cyclopentanone and cyclohexanone exist as mixture of open and cyclic dimer. The analysis of inter-nuclear distances among interacting atoms (predicted by quantum mechanical calculations) also supports the presence of proposed molecular entities in pure and mixed states. It has been observed that VE, κS E, CP E and HE estimated by Graph theory compare well with their experimental values. © 2017 Elsevier B.V.


Srinivasa Krishna T.,Nalanda Institute of Technology | Gowri Sankar M.,Acharya Nagarjuna University | Govardhan Rao S.,St Marys Group Of Institutions | Munibhadrayya B.,Sri Venkateswara College of Engineering
Journal of Molecular Liquids | Year: 2015

This paper reports measurements of densities (ρ), and speeds of sound (u) for the binary systems of an ionic liquid and an alkanediol at T = (298.15 to 323.15) K. The ionic liquid is 1-butyl-3-methylimidazolium tetrafluoroborate [bmim(BF4)] and alkanediols are 1,2-propanediol or 1,3-propanediol. The excess molar volumes and the excess molar isentropic compressibility for the above systems were calculated from experimental densities and the speeds of sound, respectively. Redlich-Kister polynomial equation was used to fit the excess molar volume and excess isentropic compressibility data. A qualitative analysis of intermolecular interactions and structural effects between [bmim(BF4)] and alkanediols are analyzed in terms of declustering and breaking of H-bonds in alkanediols, new hydrogen bonding, and ion-dipole interactions at all temperatures. © 2015 Published by Elsevier B.V.


Sunkara G.R.,St Marys Group Of Institutions Guntur | Tadavarthi M.M.,Vasireddy Venkatadri Institute of Technology | Tadekoru V.K.,Vasireddy Venkatadri Institute of Technology | Tadikonda S.K.,Nalanda Institute of Technology | Bezawada S.R.,VSR and NVR College
Journal of Chemical and Engineering Data | Year: 2015

Density , refractive index (nD), and speed of sound (u) values are measured for the binary mixture of 1-butyl-3-methylimidazolium tetrafluoroborate (1) and N-vinyl-2-pyrrolidinone (2) over the entire range of mole fractions at temperatures from T = (298.15 to 323.15) K under atmospheric pressure. Using the basic experimental data, various acoustic and thermodynamic parameters are calculated and are discussed in terms of molecular interactions between the present investigated binary system. The excess values are fitted to the Redlich-Kister polynomial equation to estimate the binary coefficients and standard deviation between the experimental and calculated values. Further, the molecular interactions in the binary mixture system are analyzed using the experimental FT-IR spectrum recorded at room temperature. © 2015 American Chemical Society.


Panda R.N.,Nalanda Institute of Technology | Padhy S.K.,National Institute of Technology, Patna | Panigrahi S.P.,National Institute of Technology Tiruchirappalli
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2015

The Estimation of MIMO Channels becomes a tedious task in the non-stationary environment. This is because of pilot overhead and corresponding interference. To reduce this pilot overhead, QR decomposition is proposed in the literature. However, higher the rate of the QR decomposition will result in a computationally intensive system. In this paper, we propose a two stage estimation solution to reduce the complexity as well as to eliminate the interference arising out of pilot overhead. Advantages of this paper can be seen as separation of channel impulse response and interference, elimination of the interference arising out of pilot overhead, and reduction in computational complexity. © Springer International Publishing Switzerland 2015.


Mohapatra A.K.,Nalanda Institute of Technology | Sanjay,National Institute of Technology Jamshedpur | Prasad L.,National Institute of Technology Jamshedpur
Journal of the Energy Institute | Year: 2012

The paper investigates the effect of compressor pressure ratio, turbine inlet temperature, ambient relative humidity (RH) and ambient temperature on the performance parameters of a gas turbine cycle with evaporative cooling of inlet air and different means of blade cooling. The cooling techniques include film, transpiration and internal convection cooling (ICC). The mass of coolant required for turbine blade cooling is found to decrease with a decrease in ambient temperature and ambient RH. The coolant mass required for turbine blade cooling is lowest for transpiration cooling (TC) followed by film and ICC. However, the highest reduction in coolant mass and the highest enhancement in plant efficiency and work (due to the decrease in ambient RH and ambient temperature) are observed in case of ICC followed by film cooling and TC. The increase in performance parameters due to the addition of inlet cooling system is also found to be maximum for ICC. The inlet cooling improves the plant efficiency by 11·3% and specific work by 19·7% for ICC against 4·2 and 9·8% respectively for TC. Finally, the optimum value of T IT and r p,c is suggested for best plant efficiency and plant specific work. © 2012 Energy Institute.


Mohapatra A.K.,Nalanda Institute of Technology | Sanjay,National Institute of Technology Jamshedpur
Journal of the Energy Institute | Year: 2015

The current article is focused on assessing the comparison of two different means of inlet air cooling (evaporative cooing and vapor compression cooling) integrated to a cooled gas turbine power plant. Air film cooling has been adopted as the cooling technique for gas turbine buckets. A parametric study of the effect of pressure ratio (rp,c), compressor inlet temperature (CIT), turbine inlet temperature (TIT), inlet temperature ratio (rIT), ambient relative humidity and ambient temperature on performance parameters of plant has been carried out. It has been observed that the integration of the inlet air cooling system to the gas turbine cycle improves the overall performance, the improvement being higher at higher ambient temperature and ambient relative humidity. At a TIT = 1700 K, rp,c = 23, RHa = 0.2 and Ta = 313 K, vapor compression inlet air cooling has been observed to improve the plant specific work by 18.4% and efficiency by 4.18%, compared to 10.48% and 4.6% respectively for evaporative cooling. In geographical regions having low ambient relative humidity and low ambient temperature however, evaporative inlet air cooling should be preferred over vapor compression cooling in terms of higher plant efficiency.. The adoption of higher turbine inlet temperature has a more pronounced effect on vapor compression cooled gas turbine in terms of enhancement in plant performance parameters as compared to evaporative cooling. The work ratio increases with increase in value of rIT upto5.6 after which it decreases. © 2014 Energy Institute. Published by Elsevier Ltd. All rights reserved.


Mohapatra A.K.,Nalanda Institute of Technology | Sanjay,National Institute of Technology Jamshedpur
Energy | Year: 2014

The article is focused on the comparison of impact of two different methods of inlet air cooling (vapor compression and vapor absorption cooling) integrated to a cooled gas turbine based combined cycle plant. Air-film cooling has been adopted as the cooling technique for gas turbine blades. A parametric study of the effect of compressor pressure ratio, compressor inlet temperature (Ti,C), turbine inlet temperature (Ti,T), ambient relative humidity and ambient temperature on performance parameters of plant has been carried out. Optimum Ti,T corresponding to maximum plant efficiency of combined cycle increases by 100°C due to the integration of inlet air cooling. It has been observed that vapor compression cooling improves the efficiency of gas turbine cycle by 4.88% and work output by 14.77%. In case of vapor absorption cooling an improvement of 17.2% in gas cycle work output and 9.47% in gas cycle efficiency has been observed. For combined cycle configuration, however, vapor compression cooling should be preferred over absorption cooling in terms of higher plant performance. The optimum value of compressor inlet temperature has been observed to be 20°C for the chosen set of conditions for both the inlet air cooling schemes. © 2014 Elsevier Ltd.


Mohapatra A.K.,Nalanda Institute of Technology | Sanjay,National Institute of Technology Jamshedpur
International Journal of Energy Research | Year: 2014

The integration of an aqua-ammonia inlet air-cooling scheme to a cooled gas turbine-based combined cycle has been analyzed. The heat energy of the exhaust gas prior to the exit of the heat recovery steam generator has been chosen to power the inlet air-cooling system. Dual pressure reheat heat recovery steam generator is chosen as the combined cycle configuration. Air film cooling has been adopted as the cooling technique for gas turbine blades. A parametric study of the effect of compressor-pressure ratio, compressor inlet temperature, turbine inlet temperature, ambient relative humidity, and ambient temperature on performance parameters of plants has been carried out. It has been observed that vapor absorption inlet air cooling improves the efficiency of gas turbine by upto 7.48% and specific work by more than 18%, respectively. However, on the adoption of this scheme for combined cycles, the plant efficiency has been observed to be adversely affected, although the addition of absorption inlet air cooling results in an increase in plant output by more than 7%. The optimum value of compressor inlet temperature for maximum specific work output has been observed to be 25°C for the chosen set of conditions. Further reduction of compressor inlet temperature below this optimum value has been observed to adversely affect plant efficiency. © 2013 John Wiley & Sons, Ltd.


Gudavalli M.,Vignans Nirula Institute of Technology and Science for Women | Viswanadha Raju S.,Jawaharlal Nehru Technological University | Vinaya Babu A.,JNTUH College of Engineering | Srinivasa Kumar D.,Nalanda Institute of Technology
Proceedings - 2012 International Symposium on Biometrics and Security Technologies, ISBAST 2012 | Year: 2012

Biometrics is the science and technology of measuring and analyzing biological data of human body, extracting a feature set from the acquired data, and comparing this set against to the template set in the database. The increasing demand of enhanced security systems has led to an unprecedented interest in biometric based person authentication system. Biometric systems based on single source of information are called Unimodal systems. Although some Unimodal systems have got considerable improvement in reliability and accuracy, they often suffer from enrollment problems due to non-universal biometrics traits, susceptibility to biometric spoofing or insufficient accuracy caused by noisy data. Hence, single biometric may not be able to achieve the desired performance requirement in real world applications. One of the methods to overcome these problems is to make use of multimodal biometric authentication systems, which combine information from multiple modalities to arrive at a decision. Multimodal biometric systems are those which utilize, or capability of utilizing, more than one physiological or behavioral characteristic for enrollment, verification, or identification. Studies have demonstrated that multimodal biometric systems can achieve better performance compared with Unimodal systems. We discuss here different multimodal sources, multimodal architectures different fusion techniques used in multimodal biometric systems. © 2012 IEEE.


This paper is focused on accessing the benefits of incorporating an air humidifier with a cooled gas turbine cycle. Air transpiration cooling has been adopted as the cooling technique for gas turbine blades. A parametric study of the effect of compressor pressure ratio (rp,c), compressor inlet temperature (CIT), turbine inlet temperature (TIT), inlet temperature ratio (rIT), ambient relative humidity, and ambient temperature on performance parameters of plant has been carried out. Evaporative inlet air cooling has been observed to improve the plant efficiency of a transpiration cooled gas turbine plant by 4.84% and plant specific work by 9.68% at an ambient temperature of 313 K and ambient relative humidity of 0.2. The effects of variation of ambient parameters on cycle performance are found to be more pronounced at higher turbine inlet temperature and higher compression ratio (rp,c). The work ratio increases with an increase in the value of rIT up to 5.6 after which it decreases. There exists an optimum rIT at any rp,c with reference to the maximum work ratio. The heat rate increases with an increase in rIT and a decrease in rp,c. For all values of TIT there exists an optimum rp,c at which plant efficiency is at its maximum. © 2014 American Society of Civil Engineers.

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