Khanna A.,Guru Nanak Dev University |
Bajaj A.,Adesh Institute of Engineering and Technology
AIP Conference Proceedings | Year: 2010
Bismuth borate glasses and crystalline phases have outstanding luminescent and nonlinear optical properties; therefore there is lot of interest in their preparation and characterization. In this study we report the crystallization properties of bismuth borate glasses doped with trivalent ions. Glasses of the composition: xBi2O3-(100-x)B2O3 (x=20, 25, 30, 37.5, 40, 50, 60 and 66 mol %) and 40Bi2O 3-1Tv2O3-59B2O3 (where Tv=Al, Nd and Eu) were prepared by melt quench technique and devitrified by heat treatment above their glass transition temperatures for several hours. The crystalline phases produced were characterized by FTIR absorption spectroscopy, DTA and X-ray diffraction. Bi3B5O12 was found to be the predominant phase in all crystallized samples containing Bi 2O3 concentration of ≤ 40 mol %, at higher Bi 2O3 concentration, we observed the formation of Bi 4B2O9 phase. Glasses with Bi2O 3 concentration of ≤ 37.5 mol % produced Bi2B 8O15 phase on crystallization. The metastable BiBO 3-I phase was formed by short duration heat treatment (less than 5 hours) of the initial glass sample. Doping with rare earth ions like Eu 3+ and Nd3+ promotes the formation of BiBO3-II phase while Al3+ doping suppresses it. PACS: 61.43.Fs, 61.05.cp, 78.30.-j © 2010 American Institute of Physics.
Singh A.,Adesh Institute of Engineering and Technology |
Kaur A.,GZSPTU Campus
Proceedings of the 2015 IEEE 3rd International Conference on MOOCs, Innovation and Technology in Education, MITE 2015 | Year: 2015
Providing education to physically disabled children is more difficult and challenging than normal children. Children with disabilities always face problems to learn different subjects. Educating disabled students require special teaching environment and assistive technology so that they can exploit their abilities and contribute their efforts in the society. This paper provides a case study of the use of touch technologies with android or IOS applications for educating physically disabled students. The use of touch technology for educating disabled students can play an important role. The special needs children gain more benefits from iPad and iPhone and a variety of developed apps. These apps help these children to increase the level of participation, interaction and daily activities of their life. © 2015 IEEE.
Jain M.,Guru Jambheshwar University of Science and Technology |
Jain M.,Lappeenranta University of Technology |
Garg V.K.,Guru Jambheshwar University of Science and Technology |
Garg U.K.,Adesh Institute of Engineering and Technology |
And 2 more authors.
International Journal of Environmental Research | Year: 2015
This study reports the removal of cadmium from wastewater in batch mode, using two carbonaceous adsorbents viz. Sunflower Head Carbon (SHC) and Sunflower Stem Carbon (SSC) prepared from waste biomass of sunflower. The adsorbents were characterized by Fourier Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Analysis (EDX). The results of batch experiment showed that the cadmium removal was dependent on pH, Cd(II) ion concentration, adsorbent dose, contact time and temperature. The highest cadmium adsorption was found at pH = 6.0, initial Cd(II) concentration = 100 mg/L adsorbent dose = 20 g/L, contact time = 120 min at temperature = 25±1°C and at 180 rpm. Langmuir and Freundlich isotherm models were applied and Freundlich model was found to fit the data well. The Freundlich adsorption capacity was 1.22 and 1.48 mg/g by SHC and SSC. The kinetic data was well described by pseudo-second-order model with coefficient of correlation 0.9978 for SHC and 0.9981 for SSC. The adsorption process was found to be endothermic in nature. The adsorbents were desorbed using different strengths of HCl ranging from 12.5 mM to 200 mM. The highest desorption efficiency i.e. 55.6 and 52.6% from SHC and SSC was found at 125 mM. © 2015, University of Tehran. All rights reserved.
Rani A.,Adesh Institute of Engineering and Technology
Radiation protection dosimetry | Year: 2013
Radon monitoring has been increasingly conducted worldwide because of the hazardous effects of radon on the health of human beings. In the present research, groundwater samples were taken from hand pumps at different areas of the districts of SriGanganagar, Hanumangarh, Sikar and Churu in northern Rajasthan. RAD7, an electronic radon detector (Durridge co., USA), was used to estimate the radon concentration in groundwater used for drinking. Radon concentration in the groundwater ranged from 0.5 ± 0.3 Bq l(-1) (Chimanpura) to 85.7±4.9 Bq l(-1)(Khandela) with an average value of 9.03±1.03 Bq l(-1). In 89 % of the samples, radon concentration is well below the allowed maximum contamination level (MCL) of radon concentration in water of 11 Bq l(-1), proposed by US Environmental Protection Agency (USEPA). Only in 11 % of the samples, the recorded values were found to be higher than MCL proposed by USEPA and only in 5 % of the samples, the recorded values were found to be higher than the values between 4 and 40 Bq l(-1) suggested for radon concentration in water for human consumption by the United Nations Scientific Committee on the effect of Atomic Radiation (UNSCEAR). The annual effective dose in stomach and lungs per person was also evaluated in this research. The estimated total annual effective dose of adults ranged from 1.34 to 229.68 μSv y(-1). The total annual effective dose from three locations of the studied area was found to be greater than the safe limit (0.1 mSv y(-1)) recommended by World Health Organization and EU Council.
Bajaj A.,Adesh Institute of Engineering and Technology |
Khanna A.,Guru Nanak Dev University |
Krishnan K.,Bhabha Atomic Research Center |
Aggarwal S.K.,Bhabha Atomic Research Center
Phase Transitions | Year: 2013
Lead borate glasses containing 30 to 60 mol% PbO were prepared by melt quenching technique and devitrified by long duration heat treament in the supercooled region. Glasses crystallized on heating above their glass transition temperature, and the crystalline phases produced on devitrification were characterized by XRD and DSC analyses. Glass with 30 mol% PbO slowly formed a solid solution of Pb6B10O21 and Pb 5B8O17 crystalline phases, while glasses with 40 and 50 mol% PbO formed a mixture of Pb6B10O 21, Pb5B8O17 and the remanent glassy phase. Glasses with higher PbO concentration of 56 to 60 mol% devitrified completely and produced only Pb5B8O17 crystalline phase. Lead borate glasses with PbO concentration of 40 to 50 mol% showed maximum thermal stability against devitrification, the ease of crystallization of glasses was correlated with the fraction of tetrahedral borons in them. © 2013 Copyright Taylor and Francis Group, LLC.