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- 저자 : ( Pravin Chandra ) (검색결과 4 건)
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Pravin Kumar Ray,Devesh Chandra Bharati,J. P. Singh,A. L. Saroj 한국고분자학회 2023 Macromolecular Research Vol.31 No.6
Carboxymethyl cellulose (CMC) + xwt% Ethylenediaminetetraacetic acid (EDTA) (x = 0, 10, 20, 30, 40)-based biopolymer electrolytes (BPEs) plasticised with polyethylene glycol (PEG) were prepared by using solution cast method. Fourier transform infrared (FTIR) spectroscopic analysis shows the complexation of salt, EDTA with the functional groups of CMC. Impedance analysis shows that the sample containing 20wt%EDTA has the optimum dc conductivity ~ 8.95 × 10–5 S/cm at 30 °C with least activation energy ~ 0.25 eV. Temperature-dependent dc conductivity, dielectric properties and ion dynamics have been analyzed to explore the ion transport mechanism. The scaling of frequency-dependent conductivity and loss tangent were analyzed with respect to EDTA concentration and temperatures. Mobility (µ), charge carrier density (N) and ion diffusivity (D) for all samples were estimated and the sample containing 20wt% EDTA shows the optimum values. Ionic transference number (ITN) measurements reveal that ions are the principal charge carriers. Electrochemical stability window (ESW) was found to be ~ ± 2 V for 20wt% EDTA containing sample.
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A Robust Fingerprint Matching System Using Orientation Features
Kumar, Ravinder,Chandra, Pravin,Hanmandlu, Madasu Korea Information Processing Society 2016 Journal of information processing systems Vol.12 No.1
The latest research on the image-based fingerprint matching approaches indicates that they are less complex than the minutiae-based approaches when it comes to dealing with low quality images. Most of the approaches in the literature are not robust to fingerprint rotation and translation. In this paper, we develop a robust fingerprint matching system by extracting the circular region of interest (ROI) of a radius of 50 pixels centered at the core point. Maximizing their orientation correlation aligns two fingerprints that are to be matched. The modified Euclidean distance computed between the extracted orientation features of the sample and query images is used for matching. Extensive experiments were conducted over four benchmark fingerprint datasets of FVC2002 and two other proprietary databases of RFVC 2002 and the AITDB. The experimental results show the superiority of our proposed method over the well-known image-based approaches in the literature.
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A Robust Fingerprint Matching System Using Orientation Features
( Ravinder Kumar ),( Pravin Chandra ),( Madasu Hanmandlu ) 한국정보처리학회 2016 Journal of information processing systems Vol.12 No.1
The latest research on the image-based fingerprint matching approaches indicates that they are less complex than the minutiae-based approaches when it comes to dealing with low quality images. Most of the approaches in the literature are not robust to fingerprint rotation and translation. In this paper, we develop a robust fingerprint matching system by extracting the circular region of interest (ROI) of a radius of 50 pixels centered at the core point. Maximizing their orientation correlation aligns two fingerprints that are to be matched. The modified Euclidean distance computed between the extracted orientation features of the sample and query images is used for matching. Extensive experiments were conducted over four benchmark fingerprint datasets of FVC2002 and two other proprietary databases of RFVC 2002 and the AITDB. The experimental results show the superiority of our proposed method over the well-known image-based approaches in the literature.
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Harshita Chawla,Amrish Chandra,Pravin Popinand Ingole,Seema Garg 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
In the recent past decade, layered bismuth metal oxides (Bi2MO6, M = W, Mo and Cr) have establishedsubstantial consideration comparable to bismuth oxyhalides (BiOX, X = Cl, Br, I and F) for its emergingpotential towards its photocatalytic applications in clean energy production and environmentalremediation. Their electronic band structure characterises appropriate band-gap for visible lightphotocatalytic activity. The photocatalytic activities of these materials can be deliberately incrementedusing various strategies including formation of heterojunction, modification of interface, usingsensitizers, metal and non-metal doping, development of composites, and formation of oxygenvacancies. Nevertheless, its visible light applications limit up due to higher recombination ofphotoinduced charge carriers. This review systematically encapsulates electronic spectra, strategiesimplemented for higher separation of charge carriers, and establishing its potential in thefield of cleanenergyproduction as well as degrading manageable and recalcitrant pollutants. Finally, the currentscenario and future aspects of using Bi2MO6 photocatalysts are summarised.
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