Roy N.,Defence Research and Development Organization |
Behera C.,National Institute of Technology Agartala |
Choudhury R.N.P.,Sikshaoanusandhan University
Journal of Materials Science: Materials in Electronics | Year: 2017
The polycrystalline samples of 2% MnO2 doped barium-strontium titanate (BST) were synthesized in various Ba/Sr ratio (0.8, 0.6, 0.4, 0.2) by a mixed oxide method (calcination temperature = 1150 °C for 8 h, sintering temperature = 1200 °C for 8 h) using high-purity ingredients (barium carbonate, strontium carbonate, titanium dioxide and manganese dioxide). Preliminarily structural analysis of the samples shows the existence of a major phase of perovskite and a minor phase of MnO2. The lattice parameters of a major phase (orthorhombic system) and microstructure of the ceramic samples were determined by powder X-ray diffraction and scanning electron microscopy analysis respectively. Significant modification in the dielectric properties (permittivity and tangent loss) of BST of different Ba/Sr ratios was observed on addition of even fixed amount of manganese dioxide. The composition ratios and additive dependent dielectric, impedance and related characteristics of the samples provide insight into the material behavior and modified capacitive and resistive parameters. The AC/DC conductivity spectra derived for the different compositions spell out clearly about the electrical processes and mechanism involved in the synthesized materials. This paper tries to bring out the unique structural and electrical features of the manganese oxide modified of Ba/Sr (0.8, 0.6, 0.4 and 0.2). The observation of low dielectric loss and high bandwidth held promise for applications in tuned circuits. © 2017 Springer Science+Business Media, LLC
Das A.,SikshaOanusandhan University |
Moharana L.,SikshaOanusandhan University
Proceedings - 2016 2nd IEEE International Conference on Research in Computational Intelligence and Communication Networks, ICRCICN 2016 | Year: 2016
Wireless sensor networks are 'exciting emerging domain of deeply networked systems of low power wireless motes with a tiny amount of CPU and memory and large federated networks for high resolution sensing of the environment'. Wireless sensor networks have verities of applications including endangered animals monitoring, military applications like tracking positions of soldiers. Important points to be considered in this application are to secure the location of monitored objects. In presence of object sensor nodes sends event reporting messages periodically. Attackers can back track those messages to reach at source to capture the object. Different kind of techniques have been developed to protect the object from adversary like 'Phantom routing', Cyclic entrapping method (CEM) and Path extension method (PEM) which provides source location privacy in some extend but not provides 100 percent safety to the source. In this Paper a new method called Bypassing using Directional Transceivers (BDT) is introduced which performs well in case of safety, energy consumption and throughput analysis. Within a sensor network instead of using single transceiver in this new method four directional transceivers are used to provide better safety. Backtracking by adversary can be delayed by changing the direction of original path away from adversary. © 2016 IEEE.
Paidesetty S.K.,Sikshaoanusandhan University |
Rout S.K.,Sikshaoanusandhan University |
Sahoo J.,Sikshaoanusandhan University
International Journal of Pharmacy and Pharmaceutical Sciences | Year: 2015
Objective: The aim of the research work is to synthesize some of novel Benzene-1, 3-diol analogues by incorporation of various aryl and hetero arylazo moieties. The newly synthesized Benzene-1, 3-diol congeners were evaluated to study their in vitro antimicrobial and antioxidant activities. Methods: This part of the research work includes the synthesis of a series of Benzene-1, 3-diol analogues by coupling of Benzene-1, 3-diol with different di azotized aryl and hetero aryl amines. Their structures and physical characteristics were confirmed by different modern analytical techniques viz. FT/IR,1H NMR, UV-vis spectroscopy, LC-MS, DSC and elemental analysis. The in vitro antimicrobial activity of the synthesized compounds were performed by cup and plate method against different gram positive and gram negative bacterial and fungal strains. The radical scavenging activity of the Benzene-1, 3-diol analogues was measured by DPPH model. Results: The results of antimicrobial activity of Benzene-1, 3-diol analogues were statistically interpreted. The newly synthesized compounds of Benzene-1, 3-diol substituted with antipyrinyl and isoxazolyl nucleus showed significant antimicrobial activities when compared with standard drugs. The Benzene-1, 3-diol analogues also exhibited effective antioxidant activity. Conclusion: The research work concluded that the newly synthesized Benzene-1, 3-diol analogues posses significant antimicrobial and potential antioxidant activity. © 2015, International Journal of Pharmacy and Pharmaceutical Sciences. All Rights Reserved.
Prusty S.K.,SikshaOanusandhan University
Indian Drugs | Year: 2017
Exposure to chronic stress is an important factor of neurodegeneration. Forced swimming test is a common model for chronic stress which needs validation in terms of duration of exposure and correlation of behavioural, histological and anti-oxidant status. Adult wistar albino rats (150-200 g) of both sexes were divided into two groups. Group I treated as control and Group II animals were subjected to forced swimming test for 30 minutes daily. On different days (0, 3,7,15 and 30) effect on behavioural, histological and anti-oxidant status was evaluated. Swimming stress of 30 minutes daily for 15 days significantly (p<0.05) decreased the time of fall in rotarod, locomotor activity in actophotometer, number of correct entries in radial maze, superoxide dismutase (SOD) level and significantly (p<0.05) increased the malondialdehyde (MDA) content along with prominent tissue degeneration in brain, heart, liver and kidney. The present study reveals that 30 minutes exposure to forced swimming for 15 days can be a novel model of chronic stress as it results in significant alterations in behavioural, histological and antioxidant status.
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.
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.