Bhubaneshwar, India
Bhubaneshwar, India

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Ghatak R.,National Institute of Technology Durgapur | Sarkar P.,SikshaOanusandhan University | Mishra R.K.,Berhampur University | Poddar D.R.,Jadavpur University
IEEE Microwave and Wireless Components Letters | Year: 2011

In this letter, an ultrawideband (UWB) bandpass filter with a band notch is proposed. The UWB BPF (3.1-10.6 GHz) is realized by cascading a distributed high-pass filter and an elliptic low-pass filter with an embedded stepped impedance resonator (SIR) to achieve a band notch characteristic. The notch band is obtained at 5.22 GHz. It is shown that the notch frequency can be tuned by changing the impedance ratio of the embedded SIR. A fabricated prototype of the proposed UWB bandpass filter is developed. The inband and out-of-band performance obtained by measurement, EM simulation, and that with an equivalent circuit model are in good agreement. © 2011 IEEE.


Panda G.,Indian Institute of Technology Kharagpur | Dash J.K.,SikshaOanusandhan University
OPSEARCH | Year: 2014

This paper addresses a general nonlinear fuzzy chance constrained programming problem (FNCP). Both the objective function and the constraints of the (FNCP) are associated with uncertainty in the form of randomness and fuzziness. The concept of fuzzy random variable, mean and variance of a fuzzy random variable are used to develop a methodology to solve (FNCP). The methodology is explained through a numerical example. © 2013 Operational Research Society of India.


Mohapatra A.,Sikshaoanusandhan University | Mohapatra A.,Sambalpur University | Das P.R.,Sikshaoanusandhan University | Das P.R.,Sambalpur University | And 2 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2016

This research article reports structural and electrical (dielectric, impedance and conductivity) characteristics of La3+ modified Bi5Ti3FeO15 multiferroic (i.e., Bi3La2Ti3FeO15). Preliminary structural analysis of the prepared material using room temperature X-ray diffraction (XRD) data confirmed the formation of a single-phase compound in the orthorhombic crystal. The nature of scanning electron micrograph of the compound showed the uniform distribution of grains on the sample surface with less voids (high density) Detailed studies of dielectric, impedance and conduction characteristics of the material, carried out in a wide frequency range (100 Hz–1000 kHz) at different temperatures (room temperature to 500 °C) using a complex impedance spectroscopy technique, have provided vital information on dielectric relaxation, conduction mechanism and role of grains, grain boundary and interface in understanding of structure–property relationship of the material. © 2016 Springer Science+Business Media New York


Mishra S.,SikshaOanusandhan University | Devi N.,SikshaOanusandhan University
Hydrometallurgy | Year: 2011

The solvent extraction of copper(II) from hydrochloric acid solution has been investigated using the commercial extractant, Cyanex 921 in kerosene. The effect of hydrochloric acid concentration, extractant concentration, chloride concentration on the extraction of copper has been studied and a model has been developed for the extraction of copper(II) chloride in order to calculate the concentration of Cu2+ in the extracted organic phase. The distribution ratios of Cu(II) were determined for various concentrations of hydrogen ion, chloride ion and Cyanex 921(L) using the model and were in good agreement with the experimental data for the di-solvated species. The proposed complex formed in the organic phase is H2CuCl4.2L. A negative value of ΔH obtained from temperature variation studies show that the extraction process is exothermic. Almost 99.7% copper was recovered from the loaded organic phase using 0.2 M H2SO4 or 0.5 M HCl. © 2011 Elsevier B.V.


Biswal S.P.,SikshaOanusandhan University | Sahoo S.K.,SikshaOanusandhan University | Dash M.,SikshaOanusandhan University
Proceedings - 2014 13th International Conference on Information Technology, ICIT 2014 | Year: 2014

In order to maneuver over the ultra wideband range, several structures have been investigated with increased impedance bandwidth. In this context a three stacked conical ring dielectric resonator antenna has been proposed to operate beyond the ultra wideband range. The proposed antenna offers a fractional bandwidth of 161% with a monopole type radiation pattern. The enhanced bandwidth is due to the resonance of the monopole antenna at about its each wavelength for which the stacked conical resonators are highly indispensable. © 2014 IEEE.


Dash B.K.,Sikshaoanusandhan University | Achary P.G.R.,Sikshaoanusandhan University | Nayak N.C.,Sikshaoanusandhan University
Journal of Materials Science: Materials in Electronics | Year: 2015

The dielectric relaxation behaviour of the composites prepared by solution casting of exfoliated graphene nanoplatelets (xGnP) and ethylene vinyl acetate (EVA) were investigated. The percolation threshold was achieved at 17 phr (parts per hundred rubber) of xGnP loading. Filler contributions to the electrical property were observed by the increase in ac conductivity and permittivity in the composites. The effect of filler loading on the complex and real parts of the impedance were investigated. The effect of temperature on dielectric loss tangent, ac conductivity and Nyquist plot of xGnP reinforced EVA also been studied. A careful comparison of the experimental complex impedance plots and model fitted plots were studied which satisfied the accuracy of the data obtained experimentally. © 2015, Springer Science+Business Media New York.


Pradhan S.,SikshaOanusandhan University | Devi N.,SikshaOanusandhan University | Mishra S.,SikshaOanusandhan University
Journal of Central South University | Year: 2014

The extraction and separation of Cu(II) and Fe(III) from HCl media using Cyanex 921 in kerosene were investigated. The effect of shaking time, aqueous phase acid concentration, Fe(III)/Cu(II) concentration, Cyanex 921 concentration, temperature and aqueous to organic phase ratio on the separation of Cu(II) and Fe(III) was studied using 0.1 mol/L Cyanex 921 in kerosene. Maximum separation was achieved from 2 mol/L HCl containing 0.001 mol/L Cu(II) and 0.005 mol/L Fe(III) with 0.1 mol/L Cyanex 921 in kerosene. Feasible separation of copper and iron was also possible from 5 mol/L HCl using 0.02 mol/L Cyanex 921. © 2014 Central South University Press and Springer-Verlag Berlin Heidelberg.


Shukla N.,SikshaOanusandhan University | Mohapatra M.,SikshaOanusandhan University | Panda A.K.,National Institute of Science and Technology
2014 International Conference on Control, Instrumentation, Communication and Computational Technologies, ICCICCT 2014 | Year: 2014

This paper deals with design, modeling and characterization of a 50nm InAlGaAs/InGaAs based HEMT which is compared with a 50nm InAlAs/InGaAs based HEMT. A performance evaluation is done considering the above two HEMTs and the DC and RF characteristics are compared for the same device dimension. For a InAlGaAs/InGaAs based HEMT, a maximum drain current of 331mA/mm at Vgs=-0.2V, a cutoff frequency of 820GHz and a maximum oscillation frequency (fmax) of nearly 1.4THz is obtained which is more as compared to the device parameters obtained for InAlAs/InGaAs based HEMT. This HEMT has a maximum drain current of 297 mA/mm at Vgs=-0.2V, a cutoff frequency of 610GHz and a maximum oscillation frequency (fmax) of nearly 1.3THz. © 2014 IEEE.


Dash P.K.,SikshaOanusandhan University | Sahu B.N.,SikshaOanusandhan University | Biswal M.,Silicon Institute of Technology
Journal of Intelligent and Fuzzy Systems | Year: 2014

This paper proposes a fast Time-Time (TT) filtering transform for analysis and pattern recognition of nonstationary signals. A fast TT- transform algorithm is developed with different types of frequency scaling, band pass filtering and interpolation techniques to reduce the computational cost. The new time-time transform uses dyadic and selective scaling that facilitates the extraction of relevant features from time-varying signals for recognizing their patterns. The extracted features are then passed through a decision tree based classifier for the identification of the signal patterns. Various real world simultaneous power signal disturbances have been simulated to prove the efficiency of the technique. The simulation results show superior performance of the new TT-Transform while classifying overlapping disturbance patterns. Because of the new fast TT-transform algorithm and a relatively simpler classifier methodology, this technique can be used for real time localization, detection, and classification of various power quality events including other nonstationary signal time series belonging to speech, biomedical signals, etc.

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