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Bhajanker S.,NRI Institute of Research and Technology | Bhajanker S.,Barkatullah University | Srivastava V.,NRI Institute of Research and Technology | Srivastava V.,Barkatullah University | And 2 more authors.
Journal of Physics: Conference Series | Year: 2012

The mechanical and thermal properties of praseodymium monochalcogenides and monopnictides are calculated using elastic constants, those have been derived from two body inter- ionic potential theory. We have calculated the Young's modulus (E), Poisson's ratio (v), anisotropy factors (A), sound velocities and Debye temperature (θ D) for these compounds. The bulk modulus to shear modulus ratio (B/G) lies between 1.75-1.92 for all these compounds, which shows that all compounds are ductile in nature. Young's modulus shows that PrS and PrAs are stiffer than the other monochalcogenides and monopnictides of praseodymium. The variation of elastic constants (C 11, C 44) with pressure and the variation of Debye temperature with pressure are also presented for these compounds. Source


Trivedi R.,Barakatullah University | Jain S.,Government MLB PG College | Jain A.,Government MLB PG College | Gwal A.K.,Barakatullah University
Advances in Space Research | Year: 2013

The ionospheric Total Electron Content (TECs), derived by dual frequency signals from the Global Positioning System (GPS) recorded near the Indian equatorial anomaly region, Bhopal (23.2°N, 77.4°E, Geomagnetic 14.2°N) were analyzed for the period of January, 2005 to February, 2008. The work deals with monthly, diurnal, solar and magnetic activity variations on night-time enhancement in TEC. From a total of 157 night-time enhancements, 75 occur during pre-midnight and 82 post-midnight hours. The occurrence of night-time enhancement in TEC is utmost during summer months, followed by equinox and winter months. The occurrence of night-time enhancement in TEC decreases with increase in solar and magnetic activities. We observed that peak size and half amplitude duration are positively correlated, while time of occurrence of night-time enhancement in TEC and time of peak enhancement are negatively correlated with solar activity. The peak size, half amplitude duration, time of peak enhancement and time of occurrence of night-time enhancement in TEC shows negative correlation with magnetic activity. The results have been compared with the earlier ones and discussed in terms of possible source mechanism responsible for the enhancement at anomaly crest region. © 2012 COSPAR. Published by Elsevier Ltd. All rights reserved. Source

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