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Vyas R.,Malaviya National Institute of Technology, Jaipur | Vyas R.,University of Saskatchewan | Sharma S.,Jagannath Gupta Institute of Engineering and Technology | Gupta P.,Malaviya National Institute of Technology, Jaipur | And 5 more authors.
Journal of Alloys and Compounds | Year: 2013

The spin coated ZnO thin films were synthesized and tested for O 2 and NO2 gas detection. It exhibited an increase in resistance i.e. n-type behavior for O2 exposure (5-20%) and decrease in resistance i.e. p-type behavior for NO2 (2-40 ppm) exposure at operating temperatures of 250 C and 300 C in N2 atmosphere (0.4 ± 0.03 mbar). The origin of this aberrant behavior for NO2 exposure was attributed to the participation of defects in NO2 sensing characteristics in light of the data obtained from photoluminescence and Raman spectroscopy studies demonstrating the unique defect morphology of ZnO thin film. The underlying mechanism is discussed on the basis of conclusions drawn from characterization techniques and subsisting knowledge in the literature. The NO2 gas sensing is explained in terms of two competing mechanisms: one is change in charge carrier density on gas exposure as explained by surface depletion model and another is due participation of defects (oxygen vacancies) in gas sensing characteristics. © 2013 Elsevier B.V. All rights reserved. Source


Singh J.,Jagannath University | Kumar D.,Jagannath Gupta Institute of Engineering and Technology
Advances in Intelligent Systems and Computing | Year: 2014

In this paper, a user-friendly algorithm based on new homotopy perturbation transform method (HPTM) is proposed to obtain approximate solution of a time-space fractional cubic nonlinear Schrödinger equation. The numerical solutions obtained by the HPTM indicate that the technique is easy to implement and computationally very attractive. © Springer India 2014. Source


Kumar D.,Jagannath Gupta Institute of Engineering and Technology | Singh J.,Jagan Nath University
Advances in Intelligent Systems and Computing | Year: 2014

In this paper, a new reliable algorithm based on homotopy perturbation method using Laplace transform, named homotopy perturbation transform method (HPTM), is proposed to solve nonlinear fractional Harry Dym equation. The numerical solutions obtained by the HPTM show that the approach is easy to implement and computationally very attractive. © Springer India 2014. Source


Tanwar K.,Jagannath Gupta Institute of Engineering and Technology | Joshi Y.C.,University of Rajasthan
Journal of the Indian Chemical Society | Year: 2013

The methanolic extract of the fruits of Cressa cretica Linn. gave β-sitosterol, 6-hydroxy-3,4-dimethylcoumarin and 6-methoxy-7,8- methylenedioxycoumarin. These were characterized on the basis of spectroscopic studies. Source


Mathur S.,Malaviya National Institute of Technology, Jaipur | Vyas R.,Malaviya National Institute of Technology, Jaipur | Jain R.,Jagannath Gupta Institute of Engineering and Technology | Kumar P.,National Physical Laboratory India | And 2 more authors.
Journal of Non-Crystalline Solids | Year: 2011

Potentiodynamic polarization studies were carried out on unirradiated and irradiated Ti60Ni40 specimens in 1 M HNO3 aqueous medium at room temperature. The irradiation was carried out using N + 150 keV ions at a fluence of 1 × 1016 ions/cm 2. Polarization results revealed that the irradiated specimen exhibits less corrosion current density as compared to the unirradiated Ti 60Ni40 specimen. X-ray photoelectron spectroscopy (XPS) studies were also carried out on the irradiated and unirradiated specimens after corrosion test. It was observed that the absence of Ti3+ species in the oxide film of the irradiated specimen as compared to the unirradiated specimen results in the improvement of the corrosion resistance. Polarization results are also corroborated by weight loss data. © 2010 Elsevier B.V. All rights reserved. Source

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