Sridhar C.S.,Bharathiar University |
Deepthi P.S.,Sjc Institute Of Technology
2014 International Conference on Communication and Network Technologies, ICCNT 2014 | Year: 2014
A horizontal polarized, tri-band antenna for RF energy harvesting applications is presented. A simple meander inverted-F antenna (MIFA) with size of 34mm×17mm×8mm is proposed in this paper. The radiating patch is folded at one end and etched with three slits to create multiple resonant frequency bands. The antenna covers following frequency bands: Global System for Mobile communication (GSM900MHz, 880-960 MHz)/Digital Communication System (DCS1800MHz, 1710-1880 MHz)/WiFi (2450MHz, 2400-2480 MHz).The proposed antenna has been designed and analyzed by using High Frequency Structure Simulator (HFSS). The antenna shows good measured performance of -0.2dBi at 1.5GHz and -0.4dBi at 1.61GHz and 1.7GHz. © 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.
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.
Narayana G.,Sjc Institute Of Technology |
Bai H.S.,Bangalore University |
Jyothi M.P.,Deprtment of Design Engineer
Research and Applications in Structural Engineering, Mechanics and Computation - Proceedings of the 5th International Conference on Structural Engineering, Mechanics and Computation, SEMC 2013 | Year: 2013
The soil flexibility effect is generally ignored in seismic design of building frames and the design is carried out based on results of dynamic analysis considering fixed base condition. Flexibility of soil causes lengthening of lateral natural period due to overall decrease in lateral stiffness of the structure. Such lengthening of lateral natural period(T) may considerably alter the seismic response of the building frames resting on Raft foundation. Hence it is necessary to incorporate the flexibility of soil on which the foundation rests during analysis, such study being termed as Soil Structure Interaction. The present paper deals with dynamic behaviour of building frames asymmetric in plan with Raft footings under seismic forces incorporating soil-structure interaction. The analysis is carried out using FEM software SAP 2000*V14. The structure is idealized as 3D space frame where in beam and column are modeled as 2 noded line elements with six degrees of freedom at each node and slabs are modeled as thin shell with four noded plate elements having six degrees of freedom at each node. The soil is modeled as equivalent springs with single(Winkler) and six degrees of freedom(Modified winkler) the stiffness of which varies with type of soil based on the properties, viz., dynamic shear modulus and poissons ratio of soil. The raft foundation for winkler and Modified Winkler are modeled as thin shells with four noded plate elements having 6 degrees of freedom at each node and is discritised, such that the aspect ratio of the elements are equal to one. The response in terms of fundamental Natural Period, Seismic Base Shear and Max. Lateral Displacement, for a variety of building frames with and without consideration of soil flexibility is compared to evaluate the contribution of soil structure interaction on building frames. Influence of of parameters such as different soil types (i.e, Soft, Medium and Stiff), different span lengths, number of bays and number of stories are considered in the parametric study for Zone V. It is found that the effect of soil flexibility on building frames appreciably alters the fundamental lateral natural period and seismic base shear of the system. Due to the effect of soil flexibility, the lateral natural period and seismic base shear increase with the decreasing stiffness of soil. It is also observed that the lateral period and base shear of the building increases with increase in number of bays. The Maximum lateral displacement increases with increase in number bays and stories. © 2013 Taylor & Francis Group.
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.
Babu E.R.,Bangalore Institute of Technology |
Reddy G.V.G.,SJC Institute of Technology
Journal of Engineering Science and Technology | Year: 2016
This paper presents preliminary experimental results on thermal performance of a closed loop pulsating heat pipe (CLPHP) using copper tube having internal and external diameter with 2 mm and 3 mm respectively. For the experimentation, filling ratio (FR) was varied from 30 % to 70% with 10% increments, four turns and different heat inputs of 10 to 22 W(Watts) is supplied to PHP’s. The position of the PHP’s was vertical bottom heat mode. The length of evaporator, adiabatic and condenser section was maintained 55, 80, and 50 mm respectively. The working fluids are selected as Acetone, Methanol, Ethanol, CCL4 (Carbon Tetrachloride), and Benzene. In this study, characteristics of the thermal resistance and average evaporator temperatures at different heat input for various working fluids have been determined. The result shows that, the thermal resistance decreases rapidly with the increase of the heating input from 10 to 22 W. Further, slowly was extended on different working fluids as mentioned. From the experimental results, Acetone was found to be better working fluid as compared to other fluids. © School of Engineering, Taylor’s University.
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.
Shivashankara G.P.,P.A. College |
Siddegowda,Sjc Institute Of Technology
WIT Transactions on Ecology and the Environment | Year: 2011
This paper explores household environmental problems in developing countries like India. Population density poses a major threat to household environmental conditions. To study the association between income and variables of household environment and health in the slums of Bangalore metropolitan city, a number of variables were considered. Data was collected with the help of a questionnaire from 4,560 households selected from 120 slums in the city. Water samples were collected from open containers used by slum dwellers and analyzed for quality parameters. Chi-square analysis indicates that income and environment conditions are significant at 1% level. The study shows that lack of basic amenities and poor living conditions increase pollutants around low-income households. The study found average incidence of dysentery compared to respiratory diseases, jaundice and malaria. The main reasons for higher incidence of dysentery are unsatisfactory water quality, storage of drinking water in open containers, disposal of fecal matter and lack of toilet facilities. Regression analysis shows positive correlation between diseases and other variables. Multiple regression models show that municipal collection of fecal matter and storage of water in open containers are significant variables. Further, the coefficient of determination, R2, shows 92.9% variation in dysentery as shown by independent variables. The most severe household environmental problems and health effects are faced by the poor, i.e., low-income households. The study considers poverty to be the greatest polluter. © 2011 WIT Press.
Ashritha M.,Sjc Institute Of Technology |
Sridhar C.S.,Sjc Institute Of Technology
Proceedings of 2015 IEEE 9th International Conference on Intelligent Systems and Control, ISCO 2015 | Year: 2015
Security and privacy are the two major concerns in VANETs. Due to highly dynamic environment in VANETs computation time for authentication is more. At the same time most of the privacy preserving schemes is prone to Sybil attacks. In this paper we propose a lightweight authentication scheme between vehicle to RSU, vehicle to vehicles and to build a secure communication system. In this method we make use of timestamps approach and also reduce the computation cost for authentication in highly dense traffic zones. The privacy of the vehicle is preserved by not disclosing its real identity. © 2015 IEEE.