Op Jindal Institute Of Technology

Raigarh Fort, India

Op Jindal Institute Of Technology

Raigarh Fort, India
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Satapathy K.K.,Op Jindal Institute Of Technology | Khan F.,National Institute of Technology Raipur
Advanced Materials Letters | Year: 2013

The mechanoluminescence (ML) of γ-irradiated ZnAl2O4: Dy phosphor has been studied. ZnAl2O4 samples having different concentrations of Dy were prepared by solution combustion technique by using hydrazine as a fuel. ML was excited impulsively by dropping a load onto the sample. Two distinct peaks have been observed in the ML intensity versus time curve. Maximum intensity is obtained for 0.1 mol% of Dy doped ZnAl2O4 phosphor. ML spectra of the phosphors show two distinct peaks around 482 nm and 585 nm which is characteristic emission of Dy3+. It is also observed that the ML intensity of the samples increases almost linearly with increasing mass of the sample and gamma ray doses given to the sample. Experimental results suggest that the ML excitation is related to the movement of dislocation with defect centres and it may be used for dosimeter applications. © 2013 VBRI press.

Satapathy K.K.,Op Jindal Institute Of Technology | Mishra G.C.,Op Jindal Institute Of Technology | Khan F.,National Institute of Technology Raipur
Luminescence | Year: 2015

Eu doped ZnAl2O4 phosphors were synthesized by the solution combustion technique using carbohydrazide as a fuel. Mechanoluminescence (ML) was excited impulsively by dropping a piston of 0.7 kg onto the phosphors. Two distinct peaks were observed in the ML glow curve of the γ-ray irradiated ZnAl2O4:Eu phosphors. Dependence of ML on various parameters as impact velocity of the piston dropped on to it, mass of the sample, gamma ray doses given to the sample and ML spectra have been studied. ML emission spectrum showed the characteristic emission of Eu3+ ion in this system. ML is observed to be optimum for the sample having 0.2 mol% of Eu in the ZnAl2O4 phosphor. XRD result confirms formation of the phosphors. SEM characterization shows its surface morphology. This novel phosphor may be a potential candidate for dosimetric use due to its linear dose response. © 2014 John Wiley & Sons, Ltd.

Gupta S.K.,Op Jindal Institute Of Technology | Jana P.K.,Indian School of Mines
Wireless Personal Communications | Year: 2015

Energy efficient clustering and routing are two well known problems in wireless sensor networks. In this paper, we propose genetic algorithm based approaches for clustering and routing in wireless sensor networks. The clustering is based on residual energy of the gateways and distance from sensor nodes to their corresponding cluster head. The routing scheme is also based on the residual energy of the gateways along with a trade-off between transmission distance and number of forwards. We perform extensive simulations of the proposed algorithms and compare the simulation results with that of the existing algorithms. The results demonstrate that the proposed algorithms outperform the existing algorithms in terms of various performance metrics including energy consumption, number of active nodes, first gateway die and number of dead gateway per round. © 2015, Springer Science+Business Media New York.

Seth G.S.,Indian School of Mines | Sarkar S.,Indian School of Mines | Hussain S.M.,OP Jindal Institute of Technology
Ain Shams Engineering Journal | Year: 2014

An investigation of the effects of Hall current and rotation on unsteady hydromagnetic natural convection flow with heat and mass transfer of an electrically conducting, viscous, incompressible and optically thick radiating fluid past an impulsively moving vertical plate embedded in a fluid saturated porous medium, when temperature of the plate has a temporarily ramped profile, is carried out. Exact solution of the governing equations is obtained in closed form by Laplace transform technique. Exact solution is also obtained in case of unit Schmidt number. Expressions for skin friction due to primary and secondary flows and Nusselt number are derived for both ramped temperature and isothermal plates. Expression for Sherwood number is also derived. The numerical values of primary and secondary fluid velocities, fluid temperature and species concentration are displayed graphically whereas those of skin friction are presented in tabular form for various values of pertinent flow parameters. © 2013 Production and hosting by Elsevier B.V.

Das P.,OP Jindal Institute of Technology | Chakravorti S.,Jadavpur University
Journal of Electrostatics | Year: 2010

For simulation of Partial Discharge (PD) patterns, a Finite Difference Method (FDM) based model is put forward, in which three significant PD parameters are incorporated, viz. the critical field intensity for partial discharge occurrence Ec, residual field intensity Er and locations of voids inside the dielectric. The void taken in this simulation is a narrow rectangular parallelepiped, i.e. the length and breadth of the void (in the direction normal to the field) is less compared to the height (in the direction of the field) of the void. In this paper, three different electrode systems are considered, viz. Plane-Plane, Point-Plane and Point-Point. The supply voltage is considered to be sinusoidal in nature. PD simulations for different locations of voids inside the dielectric for these three configurations are carried out considering occurrence of PD and residual field to be stochastic in nature for a constant Ec. The inception and extinction of PD, effect of applied voltage on PD, shape of PD patterns in relation to instantaneous released charge amplitude, and the amount of charge which is released due to PDs during a course of time, are studied and reported in this paper. © 2010 Elsevier B.V.

Acharya S.K.,National Institute of Technology Rourkela | Mishra P.,National Institute of Technology Rourkela | Mehar S.K.,OP Jindal Institute Of Technology
BioResources | Year: 2011

Bagasse is a by-product of the sugarcane milling process, and it also is an important fuel resource for that industry. In this study an attempt has been made to utilize this by-product to prepare a composite using epoxy resin. The fibers surface was modified by alkali treatment with 5% NaOH solution for 0, 2, 4 and 6 hrs. The effect of fiber surface modification on the mechanical properties such as flexural strength of the composites was investigated with the fibers as received from the milling process. It was found that alkali-treated bagasse/epoxy composites significantly improved the flexural strength of the composite. An SEM investigation also indicated that the surface modifications improved the fiber-matrix interaction.

Sangewar R.K.,OP Jindal Institute of Technology
International Journal of Energy for a Clean Environment | Year: 2014

Artificial roughness elements in the form of hemispherical protruded impressions were designed and developed on a 14-gauge commercially available aluminum sheet with the help of appropriate dies and punches. This aluminum sheet was used as an absorber for a solar air heater. Artifi cial roughness augments turbulence and heat transfer to the air fl owing over. This aluminum solar energy absorber with protrusions had been tested for fl ow Reylonds number of 3500-15,000 under actual outdoor conditions in OPJU campus. The thermal effi ciency of a roughened solar air heater was found to be a strong function of air mass fl ow rate. Maximum thermal effi ciencies were observed as 80%, 70%, and 60% at mass fl ow rates of 1 = 0.0417, 2 = 0.0313, and 3 = 0.0208 kg/s, respectively. The collector heat removal factor (FR) varied from 0.42 to 0.50, the collector effi ciency factor (F') varied from 0.45 to 0.75, and the heat removal factor based on outlet air (F0) varied from 0.55 to 0.80 at corresponding air mass fl ow rate. For a given value of p/e (12), the Reynolds number and increased value of e/D (0.045-0.055), there was an augmentation in the Nusselt number 2.67 and 3.62 with respect to a smooth collector. The Nusselt number was maximum for a p/e value of 12 and it decreased in either sides of 12. The values of F0Ul for roughened and smooth collectors were computed to be 10 W/m2·K and 3 W/m2·K and F0(τα) to be 0.837 and 0.377, respectively. For e/D equal to 0.055, 0.045, and 0.035 and constant p/e = 12, the values of F0, Ul, and F0(ατ) are 10, 09, and 08 W/m2·K and 0.884, 0.746, and 0.664, respectively for this solar absorber. There was a ±5% variation of experimental and predicted Nusselt number based on the modifi ed correlation developed from experimental data analysis. © 2014 by Begell House, Inc.

Jena M.K.,Veer Surendra Sai University of Technology | Mishra M.R.,Op Jindal Institute Of Technology
Smart Innovation, Systems and Technologies | Year: 2015

In this paper, we compute compactly supported biorthogonal Riesz basis of wavelets. We solve the Bezout equation resulting from biorthogonality of the scaling function with its dual in a simple and algebraic way. We provide some examples of the biorthogonal wavelets showing their detail construction. Two algorithms for their construction are also given. © Springer India 2015.

Satapathy K.K.,Op Jindal Institute Of Technology | Mishra G.C.,Op Jindal Institute Of Technology
Journal of Optoelectronics and Advanced Materials | Year: 2015

The polycrystalline powder samples of MAl2O4:Dy (M= Ba, Mg, Ca) phosphor were prepared using urea as fuel by a combustion route. Powder X-ray diffraction confirms the phase and structure. Photoluminescence(PL) emission spectrum showed characteristic emission of Dy doped in the aluminate samples. The ML(mechanoluminescence) and TL(thermoluminescence) intensity increases with increasing gamma ray dose. TL and ML measurements were carried out on Dy3+doped aluminates using gamma irradiation in the dose range 0.2-2.2 kGy. It is observed that MAl2O4 (M= Ba, Mg, Ca) doped with Dy phosphors have linear response up to about1.1 kGy of radiation dose and show low fading(5-6% over the period of 15 days) for ML and TL measurement. The simple glow curve, linear response to gamma ray dose and less fading make the MgAl2O4:Dy phosphor a suitable candidate for TL and ML dosimetry.

Rai R.K.,Government Engineering College | Upadhyay A.K.,Op Jindal Institute Of Technology | Kher R.S.,P.A. College | Dhoble S.J.,Rashtrasant Tukadoji Maharaj Nagpur University
Journal of Luminescence | Year: 2012

Terbium activated Al 2O 3 phosphors were synthesized by combustion technique using hydrazine as a reductive non-carbonaceous fuel. X-ray diffraction (XRD) patterns of the samples were recorded to confirm the formation of the sample. Scanning electron microscope (SEM) images were taken to study the surface morphology of the sample. The photoluminescence (PL), thermoluminescence (TL) and mechanoluminescence (ML) properties of the γ-ray irradiated samples were studied. ML was excited impulsively by dropping a piston on the sample. In ML glow curves one peak with a shoulder was observed. ML intensity increases with activator concentration. Optimum ML was observed for the sample having 0.5 mol% of Tb ions. In the TL glow curve two distinct peaks, one around 222 °C and another around 280 °C, were observed for the samples having 0.5 mol% of activator concentration. In the PL spectra the 5D 4→ 7F 5 line at 544 nm in the green region is observed, which is the strongest in Al 2O 3 system. It is suggested that de-trapping of trapped charge carriers followed by recombination is responsible for ML and TL in this system. © 2011 Elsevier B.V. All rights reserved.

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