Entity

Time filter

Source Type


Jakkula S.,Visvesvaraya National Institute of Technology | Deshpande V.,Kavikulguru Institute of Technology and Science
Ceramics International | Year: 2013

Glass samples with composition of (50-X) PbO-X MgO-25 TiO 2-25B2O3 (where X=0, 5, 10 and 15 mol%) were prepared using conventional quenching technique. The amorphous nature of glass samples were confirmed by XRD. The glass transition temperature, Tg and crystallization temperature Tc were determined from the DTA. It has been observed that the addition of MgO enhances the Tg. The rise in Tg with MgO content may be attributed to the greater field strength of Mg2+ cation (as compared to Pb2+) which leads to the formation of stronger bonds. These glass samples were converted to glass-ceramics by following a two-stage heat treatment schedule. It was observed that there was good correlation between the density and CTE results of the glass-ceramics. The XRD results revealed the formation of tetragonal lead titanate as a major crystalline phase in the glass-ceramics. The addition of MgO to the glass contributes to the formation of MgB4O7. The dielectric constant for all the glass-ceramic samples was observed to be higher than that of corresponding glass samples. Further, with addition of MgO the room temperature dielectric constant for glass-ceramic samples increases up to 10 mol% of MgO and then decreases for 15 mol%. It has been further observed that the variation of dielectric constant of glass-ceramic samples with MgO content is exactly opposite to the variation of crystallite size of PbTiO3 embedded in the glass ceramic-samples. © 2012 Elsevier Ltd and Techna Group S.r.l. Source


Shankar J.,Kavikulguru Institute of Technology and Science | Deshpande V.K.,Visvesvaraya National Institute of Technology
AIP Conference Proceedings | Year: 2014

Glass samples with composition (50 - X) PbO - X MO - 25 TiO2-25B2O3 (where X = 0, 5, 10 and 15 mol % and M = Ba, Sr) were prepared using conventional quenching technique. It has been observed that the addition of MO to PbO - TiO2-B2O3, enhances the Tg. The rise in Tg with MO content may be attributed to the greater field strength of M2+ cation which leads to the formation of stronger bonds. These glass samples were converted to glass ceramics by following two stage heat treatment schedule. The XRD results revealed the formation of tetragonal lead titanate as a major crystalline phase in the glass ceramics. The addition of MO to the glass, contributes to the formation of secondary crystalline phases BaB2O4, Sr2B2O5. The ferroelectric nature of all the glass ceramic samples is confirmed by P - E hysteresis measurements. © 2014 AIP Publishing LLC. Source


Lahade S.V.,Kavikulguru Institute of Technology and Science | Hirekhan S.R.,Government College of Engineering, Aurangabad
2015 International Conference on Industrial Instrumentation and Control, ICIC 2015 | Year: 2015

For the economic development and progress of any country, roads play an important role by providing transportation ease for goods as well as for passengers. The number of vehicles on road is increasing day by day which are controlled by the traditional Traffic Light Controller in the countries like India and other developing countries. In traditional Traffic Light Controller, fixed time is allotted for traffic on each road to pass irrespective of the traffic intensity. This is an inefficient controlling method which consumes time, effort and fuel of users unnecessarily; also it doesn't have any provision of sensing and giving priority for the emergency vehicles to pass first. This problem is addressed by using Intelligent and Adaptive Traffic Light Controller (IA-TLC) implemented on FPGA using verilog as an example of FSM with 35 states. FPGA, microcontroller and ASIC designs have been used for traffic light controller. Reason for selecting FPGA is that it has numerous merits over microcontroller in TLC design. Some of these merits are high speed of operation, more number of input/output ports and better performance [1]. In IA-TLC density of traffic is sensed by using IR sensors throughout day and night, and accordingly time is allotted for users to pass. Other advantages of this system are: i) System senses emergency vehicles on the individual road moreover it gives priority to the traffic of that particular road where the emergency vehicles is sensed, ii) Finds out defaulter who crosses the red signal by capturing images using camera. IA-TLC is successfully implemented on Spartan 3E FPGA and same module is simulated for Spartan-3E, Spartan-6, Virtex-5 FPGA. © 2015 IEEE. Source


Shankar J.,Kavikulguru Institute of Technology and Science | Deshpande V.K.,Visvesvaraya National Institute of Technology
Physica B: Condensed Matter | Year: 2012

The glasses with composition (50-X)PbO-XSrO-25TiO 2-25B 2O 3 (where X=0, 5, 10 and 15 mol%) were prepared using conventional quenching technique. The T g, T c, density and CTE of the glass samples were measured. The T g observed to increase with increasing concentration of SrO, while the T c first decreased and then increased. The glass samples were converted to glass ceramics by following two stage heat treatment schedule. The glass ceramic samples were characterized by XRD, SEM and dielectric measurements. The XRD results revealed the formation of ferroelectric lead titanate as a major crystalline phase in glass ceramics. Additional phases observed include Sr 2B 2O 5 and PbB 2O 4. The room temperature (RT) dielectric constant of glass and glass ceramics are in the range of 100-120 which is promising for capacitor application. © 2012 Elsevier B.V. All rights reserved. Source


Shankar J.,Kavikulguru Institute of Technology and Science | Deshpande V.K.,Visvesvaraya National Institute of Technology
Physica B: Condensed Matter | Year: 2011

Glass samples with composition of (50-X)PbO(25X)TiO 225B 2O 3 (where X=0, 5, 10 and 12.5 mol%) were prepared using conventional quenching technique. The glass transition temperature, T g and crystallization temperature T c were determined from the DTA. These glass samples were converted to glass ceramics by following two stage heat treatment schedule. The glass ceramic samples were characterized by XRD, SEM and dielectric constant measurements. The XRD results revealed the formation of ferroelectric lead titanate (PT) as a major crystalline phase in the glass ceramics. The density increases and the CTE decreases for all glass ceramics with increase in X (mol%). This may be attributed to increase in PT phase. The SEM results which show rounded crystallites of lead titanate, also supports other results. Hysteresis loops observed at room temperature confirms the ferroelectric nature of glass ceramics. The optimized glass ceramic sample exhibits high dielectric constant which is of technical importance. © 2010 Elsevier B.V. All rights reserved. Source

Discover hidden collaborations