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Chandra V.,Academy of Scientific & Innovative Research | Tiwari U.,Council of Scientific and Industrial Research Central Scientific Instruments Organization | Das B.,Council of Scientific and Industrial Research Central Scientific Instruments Organization
IEEE Sensors Journal | Year: 2016

Fiber Mach-Zehnder interferometers (F-MZI) are widely used for fiber Bragg grating (FBG) sensor interrogation purpose due to their advantages in terms of wide bandwidth, high resolution, and tunable sensitivity. They are appropriate for dynamic strain measurement applications in the areas of vibration analysis, hydrophones, and acoustic emission studies. The interferometer converts the Bragg wavelength shift of an FBG sensor into a corresponding phase shift which is finally recorded as intensity variations at the output. Power fluctuations of the light source as well as disturbances in the light guiding path and/or dependence of light source intensity on wavelength introduce fictitious output intensity variations resulting into significant measurement errors. We propose and experimentally demonstrate a dual-channel F-MZI approach that eliminates the light intensity disturbance noise. Furthermore, the proposed method also improves the demodulated signal quality by a factor of ∼3 dB. © 2016 IEEE. Source


Pal R.K.,Academy of Scientific & Innovative Research | Pal R.K.,CSIR - Central Electrochemical Research Institute | Garg H.,CSIR - Central Electrochemical Research Institute | Sarepaka R.V.,CSIR - Central Electrochemical Research Institute | Karar V.,CSIR - Central Electrochemical Research Institute
Materials and Manufacturing Processes | Year: 2016

It has been a challenge to finish optical glass surfaces due to their hard and brittle nature. Moreover, tight tolerances of surface figure and finish make polishing a more critical operation. This work reports the results of an experimental study performed for full aperture polishing of BK7 optical glass. Flat samples of borosilicate (BK7) glass are polished using an optical pitch polisher and cerium oxide (CeO2) slurry. Taguchi's L9 orthogonal array is used for the design of experiments. Abrasive concentration, pressure and overarm speed are considered as variable process parameters. Polishing is performed for duration of 120 minutes for each combination of parameters. Material removal is measured using the precision weighing balance. Surface roughness was measured using a Form Talysurf PGI 120 profiler. Abrasive slurry concentration is observed to be one of the most significant parameters in the optical polishing process. It affects both the material removal rate (MRR) and the surface roughness. Pressure applied at the workpiece–polisher interface affects the MRR, but the variation of pressure is not found to affect the surface roughness significantly. Relative motion at the workpiece–polisher interface is also observed to be significant in defining the final polishing outputs. © Taylor & Francis Group, LLC. Source


Thakur V.,CSIR - Central Electrochemical Research Institute | Thakur V.,Academy of Scientific & Innovative Research | Sharma D.,CSIR - Central Electrochemical Research Institute | Das P.,CSIR - Central Electrochemical Research Institute | Das P.,Academy of Scientific & Innovative Research
Molecular Diversity | Year: 2016

Abstract: Ethyl 3-(2,4-dioxocyclohexyl)propanoate has been explored as a precursor for the synthesis of N-substituted 4,4a,5,6-tetrahydroquinoline-2,7(1H,3H)-diones following conventional protecvtion, selective amidation, and deprotective-cyclization approaches. Moreover, a facile process for the selective dehydrogenative aromatization of these diones was developed to afford the corresponding N-substituted 3,4-dihydro-7-hydroxyquinolin-2(1H)-ones and N-substituted 7-hydroxyquinolin-2(1H)-ones under mild conditions. Graphical Abstract: [Figure not available: see fulltext.] © 2015, Springer International Publishing Switzerland. Source


Ratha S.,Indian Institute of Technology Bhubaneswar | Samantara A.K.,CSIR - Institute of Minerals And Materials Technology | Samantara A.K.,Academy of Scientific & Innovative Research | Rout C.S.,Indian Institute of Technology Bhubaneswar | And 2 more authors.
Journal of Solid State Electrochemistry | Year: 2016

The non-precious metal catalysts and their hybrids have drawn a substantial attention towards the energy conversion and storage application. In this report, we have demonstrated the electrocatalytic activity of a hybrid comprising of ZnCo2O4 (ZCO) spheres and reduced graphene oxide (RGO) in an alkaline medium consisting of 0.1 M KOH solution which showed an onset potential of −0.02 V vs. Ag/AgCl and reduction peak at −0.22 V vs. Ag/AgCl, depicting its impressive catalytic activity towards oxygen reduction reaction (ORR) and thus having the potential to be used as a high-performance cathode catalyst in a typical fuel cell. © 2015, Springer-Verlag Berlin Heidelberg. Source


Ratha S.,Indian Institute of Technology Bhubaneswar | Samantara A.K.,CSIR - Institute of Minerals And Materials Technology | Samantara A.K.,Academy of Scientific & Innovative Research | Rout C.S.,Indian Institute of Technology Bhubaneswar | And 2 more authors.
Journal of Solid State Electrochemistry | Year: 2015

The non-precious metal catalysts and their hybrids have drawn a substantial attention towards the energy conversion and storage application. In this report, we have demonstrated the electrocatalytic activity of a hybrid comprising of ZnCo2O4 (ZCO) spheres and reduced graphene oxide (RGO) in an alkaline medium consisting of 0.1 M KOH solution which showed an onset potential of −0.02 V vs. Ag/AgCl and reduction peak at −0.22 V vs. Ag/AgCl, depicting its impressive catalytic activity towards oxygen reduction reaction (ORR) and thus having the potential to be used as a high-performance cathode catalyst in a typical fuel cell. © 2015 Springer-Verlag Berlin Heidelberg Source

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