Jagannath Gupta Institute of Engineering and Technology

Jaipur, India

Jagannath Gupta Institute of Engineering and Technology

Jaipur, India
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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.


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.


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.


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.


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 nanocrystalline I, nanocrystalline II and nanocrystalline III states having crystallite size 35 ± 5 nm, 18 ± 2 nm and 10 ± 2 nm of the alloy Ti 60Ni 40 in 1 M H 2SO 4 aqueous medium. It was observed that the nanocrystalline III state exhibits superior corrosion resistance as compared to the nanocrystalline II and nanocrystalline I states of the alloy Ti 60Ni 40. XPS studies were also performed after corrosion test and it was observed that nanocrystalline III state contains only Ti 2+ and Ti 4+ species whereas nanocrystalline I and nanocrystalline II state contains Ti 2+, Ti 3+and Ti 4+ along with some unoxidized metallic Ti 0 in the case of nanocrystalline I state. Thus the small crystallite size and the presence of only Ti 2+ and Ti 4+ species in the form of TiO and TiO 2 leads to the formation of a protective oxide film which is adherent, stable and improves the corrosion resistance of the nanocrystalline III state of the alloy Ti 60Ni 40. © 2011 Elsevier B.V. All rights reserved.


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.


Singh J.,Jagan Nath University | Kumar D.,JaganNath Gupta Institute of Engineering and Technology | Kumar S.,National Institute of Technology Jamshedpur
Scientia Iranica | Year: 2013

In this paper, a reliable algorithm based on new homotopy perturbation transform method (HPTM) is proposed to solve a nonlinear differential-difference equation arising in nanotechnology. Continuum hypothesis on nanoscales is invalid, and a differential-difference model is considered as an alternative approach to describing discontinued problems. The HPTM is a combined form of Laplace transform, homotopy perturbation method and He's polynomials. The technique finds the solution without any discretization or restrictive assumptions and avoids the round-off errors. The numerical solutions show that the proposed method is very efficient and computationally attractive. It provides more realistic series solutions that converge very rapidly for nonlinear real physical problems. © 2013 Sharif University of Technology. Production and hosting by Elsevier B.V. All rights reserved.


Singh J.,Jagannath University | Kumar D.,JaganNath Gupta Institute of Engineering and Technology | Kumar S.,National Institute of Technology Jamshedpur
Ain Shams Engineering Journal | Year: 2013

In this paper, a user friendly algorithm based on new homotopy perturbation transform method (HPTM) is proposed to solve nonlinear fractional Fornberg-Whitham equation in wave breaking. The new homotopy perturbation transform method is combined form of Laplace transform, homotopy perturbation method and He's polynomials. The nonlinear terms can be easily handled by the use of He's polynomials. The numerical solutions obtained by the proposed method indicate that the approach is easy to implement and computationally very attractive. © 2012 Ain Shams University. Production and hosting by Elsevier B.V. All rights reserved.


Gupta M.K.,Jagannath Gupta Institute of Engineering and Technology | Jain R.,Jagannath Gupta Institute of Engineering and Technology
International Journal of Renewable Energy Research | Year: 2013

In this paper, the MPPT (Maximum Power Point Tracking) with DC submersible solar pump is implemented in MATLAB with output sensing direct control method using Cuk converter. The simulated system consists of the BP SX 150S photovoltaic (PV) module, the ideal Cuk converter, the MPPT control, and the dc submersible solar pump. The selection of the purturb & observe (P&O) algorithm permits the use of output sensing direct control method which eliminates the input voltage and current sensors. The direct control method adjusts of duty cycle within the MPP tracking algorithm. The way to adjust the duty cycle is totally based on the theory of load matching. When the value of Rload (Load of DC submersible pump) matches with that of Ropt, the maximum power transfer from PV to the load will occur. These two are, however, independent and rarely matches in practice. The goal of the MPPT is to match the impedance of load to the optimal impedance of PV.


Mathur S.,Jagannath Gupta Institute of Engineering and Technology | Jain R.,Jagannath Gupta Institute of Engineering and Technology | Kumar P.,National Physical Laboratory India | Sachdev K.,Malaviya National Institute of Technology, Jaipur | Sharma S.K.,Malaviya National Institute of Technology, Jaipur
Journal of Alloys and Compounds | Year: 2012

Polarization studies were carried out on crystalline, amorphous and nanocrystalline states of the alloy Ti 60Ni 40 in 1 M NaCl aqueous medium at room temperature. It was observed that nanocrystalline state exhibits superior corrosion resistance as compared to other states of the alloy Ti 60Ni 40. Cyclic voltammetry studies and weight loss data corroborates the polarization studies. X-ray photoelectron spectroscopy (XPS) technique was used in order to decipher the nature of the oxide film formed after corrosion test on the specimens of the alloy Ti 60Ni 40. The crystalline specimen of the alloy Ti 60Ni 40 shows the presence of Ti 2+, Ti 3+ and Ti 4+ species along with some unoxidized Ti in metallic form (Ti 0) whereas the amorphous specimen consists of Ti 3+ and Ti 4+ species. On the other hand nanocrystalline specimen contains only Ti 4+ species. Thus it is likely that the presence of fewer species and the absence of Ti 3+ in the oxide film formed on nanocrystalline specimen of Ti 60Ni 40 lead to the formation of a film with greater homogeneity and protective quality in comparison to the films formed on crystalline and amorphous states of the alloy Ti 60Ni 40 in 1 M NaCl aqueous medium. © 2012 Elsevier B.V. All rights reserved.

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