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Pandey B.,Gb Pant University Of Ag And Technology | Pandey K.,Ajay Kumar Garg Engineering College | Agrawal H.M.,Gb Pant University Of Ag And Technology
Annals of Nuclear Energy | Year: 2011

The excitation functions of (n,p) reactions for the stable isotopes of Cr, Fe and Ni were calculated using EMPIRE 3.0 β1 (ARCOLE) from threshold to 20 MeV. The cross-sections are calculated using full featured Hauser-Feshbach statistical model with pre-equilibrium effects by invoking DEGAS option in the code. A good agreement between the calculated and experimental data (EXFOR data base) as well as evaluated data is obtained with option of neutron and proton potentials by Koning (Global) and HFB parity dependent nuclear level density. This is an important step to the validation of nuclear model with superior predictive power. The compound nucleus and pre-equilibrium reaction mechanisms as well as the isotopic effects were also studied. © 2010 Elsevier Ltd. All rights reserved.

Massey S.,Gb Pant University Of Ag And Technology | Maurya R.,Gb Pant University Of Ag And Technology
Man-Made Textiles in India | Year: 2012

Saree has always been the favourite garment of women in India. It has a timeless charm and is the most favoured garment worn at formal occasions and at religious ceremonies. Varanasi has long been famous for its brocades and sarees. The demand of Varanasi saree in National and International market promoted the weaving of sarees on a vast scale. Hence, in the present study an attempt has been made to study the technical details of Varanasi sarees i.e. designs, motifs, dyes and embellishments. 120 respondents were selected from different weaving units of Varanasi city through proportional technique. The data collected by interview schedule was tabulated and analyzed using frequency, percentage and weighted scores.

Dixit G.,Inter University Accelerator Center | Dixit G.,Gb Pant University Of Ag And Technology | Singh J.P.,Inter University Accelerator Center | Chen C.L.,Academia Sinica, Taiwan | And 5 more authors.
Journal of Alloys and Compounds | Year: 2013

Present work reports the structural, morphological, electrical properties of the Ce doped nickel ferrite (NiFe2O4) compounds and their electronic structures studied by X-ray absorption spectroscopy. The samples of NiFe2-xCexO4 (x = 0.0-0.10) were prepared by the chemical route and sintered at 1100 °C for 3 h. X-ray diffraction patterns of these sintered pellets show that Ce doped samples exhibit pure spinel phase up to x = 0.03. With increase of Ce concentration the crystallite size of the samples change randomly, however lattice parameters do not exhibit any significant change. Temperature dependent resistivity shows semiconducting nature for all the compositions. Sample with Ce concentration x = 0.04 shows maximum resistivity. The sample with x = 0.02 shows highest dielectric constant in the frequency range of 75 kHz-1 MHz at room temperature. The observed results are discussed on the basis of change in the electronic structure of these compounds with the Ce concentration. It has been observed that valence state of Ce ion is playing dominant role in determining the electrical and dielectric properties of the synthesized system. © 2013 Elsevier B.V. All rights reserved.

Singh J.P.,Gb Pant University Of Ag And Technology | Srivastava R.C.,Gb Pant University Of Ag And Technology | Agrawal H.M.,Gb Pant University Of Ag And Technology | Chand P.,Indian Institute of Technology Kanpur | Kumar R.,Indian National Institute of Engineering
Current Applied Physics | Year: 2011

The present investigation aims to study the swift heavy ion irradiation induced effects in zinc ferrite nanoparticles through X-ray diffractometry, transmission electron microscopy and electron paramagnetic resonance spectroscopy. A series of zinc ferrite nanoparticles having different crystallite sizes ranging from 12 to 62 nm have been synthesized by using the nitrates of cations and the citric acid as the host. These samples were irradiated by 100 MeV oxygen beam with two fluences 1 × 1013 and 5 × 1013 ions/cm2. The XRD patterns show the deterioration of crystalline phase after irradiation. The average crystallite size decreases after irradiation. EPR analyses of the pristine and irradiated samples show that the changes depend on the average crystallite size of the pristine samples. Further, the pristine sample having a crystallite size of 62 nm passes through dominant changes after irradiation. It was observed that the number of magnetic centres decreases in the irradiated samples. © 2010 Elsevier B.V. All rights reserved.

Kumar P.,Indian Institute of Technology Delhi | Kumar P.,Inter University Accelerator Center | Singh V.,National Institute of Technology Kurukshetra | Sharma V.,Malaviya National Institute of Technology, Jaipur | And 3 more authors.
Ceramics International | Year: 2015

We report the effect of phase segregation on the structural, morphological, and optical properties of sol-gel synthesized Zn1-xYxO samples in dilute concentration of 1-5 %. X-ray diffraction patterns confirm that below 3% of Y doping, pure ZnO wurtzite structure phase is obtained and phase segregation of Y2O3 appears at x-0.03. XRD results are well supported by the results obtained from scanning electron microscopy, Photoluminescence and Raman spectroscopy techniques. The difference in the charge states, ionic radii and the coordination numbers of host lattice and dopant ions leads to the phase segregation. © 2015 Elsevier Ltd and Techna Group S.r.l.

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