Domadiya J.V.,Tektronix Inc. |
Kandagal A.P.,India Private Ltd |
Ramesh N.,Sjc Institute Of Technology
Proceedings of 2014 International Conference on Contemporary Computing and Informatics, IC3I 2014 | Year: 2014
The line spectral frequency (LSF) is used in speech compression because of their quantization property, which is computed using linear prediction conversion (LPC). Paper describes the faster conversion of LPC to LSF method and its implementation. Proposed method is based on complex Ferrari equation and implemented in MatLab, C floating and fixed point arithmetic. This algorithm does not require any further iterations to calculate the roots as in complex free Ferrari based solutions, or intra frame ordering property or a distribution probability of the interval of roots of LSF polynomials. Proposed algorithm has been compared to GSM AMR-NB speech codec method, Cardano's cubic solution based method and complex free Ferrari solution based methods up to 20th order. The algorithm uses decimation in degree (DID). There is a reduction of 80% in iterations compared to traditional grid method used in AMR-NB for a polynomial of 10th order. © 2014 IEEE.
Bhat J.I.,Mangalore University |
Manjunatha M.N.,Sjc Institute Of Technology
Asian Journal of Chemistry | Year: 2012
The paper deals with the study on the solvation behaviour of ammonium citrate in water and various compositions (v/v) of water + acetonitrile and water + dimethyl sulfoxide in the temperature range 283 to 313 K. The electrical conductivity data were analyzed by Kraus-Bray and Shedlovsky models of conductivity. The molar conductance at infinite dilution λm o found to decrease with increase in the amount of co-solvent indicating the increased ion-solvent interaction and solvent-solvent interactions. Association constant K a and dissociation constant K c have been computed in all the cases. The K a value decreased with the increase in temperature indicating exothermic behaviour of the system. Walden product and corrected Stokes radius have been determined in all the cases of solvent mixtures. Thermodynamics of solvation such as δG s-s, δS s-s and δH s-s have also been evaluated from Born equation. These data were utilized to study the ion-solvent and solvent-solvent interactions.
Shetty P.K.,Manipal University India |
Narayana Y.,Mangalore University |
Rajashekara K.M.,Sjc Institute Of Technology
Journal of Radioanalytical and Nuclear Chemistry | Year: 2011
The present work investigated the activity concentrations of natural radionuclides 226Ra, 232Th and 40K in beach sand samples along coastal Kerala including high background radiation area. The activity of 232Th ranges from below detectable level to 23029.9 Bq kg -1 with a mean value of 2660.2 Bq kg -1 for 0-10 cm depth interval. For 10-20 cm depth, the 232Th activity ranged from below detectable to 4452.2 Bq kg -1 with a mean value of 815.5 Bq kg -1. The variation of 226Ra activity with depth is parallel with the 232Th activity distribution in beach sand. Its activity varied from below detectable to 5169.5 Bq kg -1 with a mean value 487.6 Bq kg -1 at 0-10 cm depth. For 10-20 cm depth interval, the 226Ra activity ranges from below detectable to 1823.6 Bq kg -1 with a mean value 296.0 Bq kg -1. Similarly the activity varies from below detectable to 1826.6 Bq kg -1 with a mean value of 211.0 Bq kg -1 for a depth interval of 20-30 cm. The activity of 40K at different depth is also discussed. Statistical analysis of radioactivity was also carried out. The results of these investigations are presented in this paper. © 2011 Akadémiai Kiadó, Budapest, Hungary.
Devaraj S.,Sjc Institute Of Technology |
Kumar R.,Indian Institute of Technology Madras |
Sankaran S.,Indian Institute of Technology Madras
Materials Performance and Characterization | Year: 2016
The Al-4.5 wt.% Cu powder was compacted by spark plasma sintering at three compaction pressures namely 30, 40, and 50 MPa maintaining temperature constant at 500°C. Porosity seems to be closed in all the 3 cases. Relative density of S-50 is decreased due to increase in electrical erosion holes. Transmission electron microscopy studies reveal the presence of dislocations in all the compacts and shear bands observed only in the compact sintered at 50 MPa. A power law creep mechanism involving dislocations is found to be observed in all the compacts sintered at all pressures, which is evident from the TEM micrographs as well. The dissolution of Al2Cu precipitates in the aluminum matrix, and the increase in electric erosion holes were noticed with increase in pressure from 30 to 50 MPa. The decrease in the volume fraction of Al2Cu phase and the increase in the formation of electric erosion holes resulted in reduced hardness and compression strengths of the compacts. Copyright © 2016 by ASTM International.
Venkata Rao K.,BMS College of Engineering |
Raja S.,National Aerospace Laboratories, Bangalore |
Munikenche Gowda T.,Sjc Institute Of Technology
Smart Structures and Systems | Year: 2014
The present work pays emphasis on investigating the effect of different types of debonding on the bending behaviour of active sandwich beam, consisting of both extension and shear actuators. An active sandwich beam finite element is formulated by using Timoshenko's beam theory, characterized by first order shear deformation for the core and Euler-Bernoulli's beam theory for the top and bottom faces. The problem of debondings of extension actuator and face are dealt with by employing four-region model for inner debonding and three-region model for the edge debonding respectively. Displacement based continuity conditions are enforced at the interfaces of different regions using penalty method. Firstly, piezoelectric actuation of healthy sandwich beam is assessed through deflection analysis. Then the effect of actuators' debondings with different boundary conditions on bending behavior is computationally evaluated and experimentally clamped-free case is validated. The results generated will be useful to address the damage tolerant design procedures for smart sandwich beam structures with structural control and health monitoring applications. Copyright © 2014 Techno-Press, Ltd.