Browsing by Author "Banerjee, A."

Now showing 1 - 8 of 8

A study of starting methods for an induction motor using an arbitrary waveform generator
(Institute of Electrical and Electronics Engineers Inc., 2016) Banerjee, A.; Banerjee, A.; Rana, D.P.S.; Shubhanga, K.N.
In this paper the use of an arbitrary waveform generator to generate desired signals in real-time is illustrated by simulating an induction motor operation along with various starting techniques. An off-line digital simulation of an induction motor is carried out on MATLAB/SIMULINK. The resulting sample-data files pertaining to signals such as electromagnetic torque and rotor speed are used in the arbitrary waveform generator to trace waveforms on an oscilloscope in real-time. This arbitrary waveform generator is developed on the Real-Time Application Interface (RTAI) enabled-Linux platform. The paper presents results of some case studies carried out by employing different starting techniques such as direct on-line and star-delta starting methods. Such a tool will be of great help in enhancing the class room learning. Â© 2015 IEEE.
Consumer acceptance towards renewable energy transition
(L and H Scientific Publishing, LLC, 2019) Majhi, R.; Banerjee, A.
The transition of non-renewable to renewable energy has always been a matter of concern for the development of a sustainable environment. As climate change and pollution are affecting the habitat, it is the dire need of the situation that some changes should be incorporated. Different stakeholders may not possess the same outlook and level of acceptability towards it, but it is the prime concern of the moment. This paper studies energy consumers 'attitude towards the transition to renewable energy in their daily life and the constraints preventing them from it. Respondent completed questionnaires which show a strong will and awareness about the rising concern of environmental change and people already have en-ergy conservation attitude. In the first phase, we have analyzed the rela-tive importance of the household practices and the conservation pattern. Whereas, in the next, we have studied the demographic and behavioral factors resulting in these habits. The output which generated shows that the consumers are interested in conservation techniques and are taking measures for adapting it. They showed relevant interests in the cultivation of renewable energy and concern toward environmental hazards generat-ed due to fossil fuels. It is also seen that based on their lifestyle and edu-cational background the consumption pattern varies and moreover it can be said that different people have a different outlook towards it. People belonging to the higher education group (Cluster 1, 115 people) are more adaptive towards the renewable energy transitions rather than, the lower educational group (Cluster 3, 41 people) where they are resistive towards the changes. The survey was done in an Indian concept and policymakers can utilize the findings to incorporate changes and build awareness among the residents. © 2019 L&H Scientific Publishing, LLC. All rights reserved.
Hervé- and Krebs-Type Magnetic Polyoxometalate Dimers
(MDPI, 2022) Kondinski, A.; Banerjee, A.; Mal, S.S.
Lacunary polyoxometalates (POMs) are negatively charged metal–oxo clusters, formally obtained from plenary topologies via fragment removal. Owing to the fragment removal, the lacunary POMs archetypes are rich in nucleophilic terminal oxo ligands, making them suitable for post-synthetic coordination with various heterometals. Trilacunary heteropolytungstates (hetero-POTs) based on bowl-shaped {W9O30} framework incorporating a central lone-pair containing {XO3} hetergroup (X = AsIII, SbIII, and BiIII) function as all-inorganic scaffolds that in the presence of d-block metal cations typically construct sandwich-like dimers of Hervé and/or Krebs. Herein we review the preparative approaches, as well as compositional and magnetic versatility of the constructed Hervé- and Krebs-type dimers and discuss prospective uses as POMtronics. © 2022 by the authors.
Investigations into the supercapacitor activity of bisphosphonate-polyoxovanadate compounds
(Academic Press Inc., 2021) Anandan Vannathan, A.; Thakre, D.; Ali, S.R.; De, M.; Banerjee, A.; Mal, S.
Electrochemical properties of two different bisphosphonate-polyoxovanadate derivatives have been studied. Both the compounds are oxovanadate polyanion derivatives having formula (NH4)4[H6(VIVO2)(VV2O5)2{O3P–C(O)(CH2-2-C5NH4)-PO3}2]•9H2O (1) and (NH4)4[H6(VIVO2)(VV2O5)2{O3P–C(O)(CH2-3-C5NH4)-PO3}2]•8H2O (2). Compounds 1 and 2 are isostructural mixed-valent polyoxovanadate structures containing 1-hydroxy-2-(2-pyridyl) ethylidene-1,1-bisphosphonate and 1-hydroxy-2-(3-pyridyl) ethylidene-1,1-bisphosphonate, respectively. Composites of these compounds have been prepared with activated carbon (AC), viz. AC-1 and AC-2 for compounds 1 and 2, respectively. In order to investigate the interaction between the parent compounds with activated carbon, the as prepared composites were further characterized using various analytical techniques, such as Infrared spectroscopy, thermal stability analysis, powder X-ray diffraction, FE-SEM, EDX, and surface adsorption studies. Electrodes from these composites have been prepared by deposition upon carbon cloth, and their electrochemical properties, with respect to the supercapacitance behavior, have been extensively studied. The electrochemical performance of both the composite materials have been tested in an aqueous 0.1 ?M ?H2SO4 electrolytic solution. AC-2 displays the highest specific capacitance of 313 ?F ?g?1 at a current density of 1 ?A ?g?1, along with incredible specific energy and power of 43.56 ?Wh kg?1 and 1999.72 ?W kg-1, respectively. Likewise, AC-1 exhibits a specific capacitance of 212 ?F ?g?1 also at the current density of 1 ?A ?g?1 with a specific energy of 29.45 ?Wh kg?1. The AC-2 electrode, therefore, shows more conducting and lower resistivity. As such, composite AC-2 was observed to light up red, green, and blue color LED bulbs for 71, 70, and 15 ?seconds, respectively, with only 42 ?mg of sample coated on carbon cloth, suggesting a remarkable specific power of that material. Comparatively, the composite AC-1 electrode could light up the red LED bulbs for about 190 ?seconds, albeit with 143 ?mg of sample coated on carbon cloth. As such, AC-2 was also observed to retain 98.71% of the electrode stability after 4500 cycles. © 2021 Elsevier Inc.
Organic-inorganic hybrid mixed-valent bisphosphonate-polyoxovanadates composites with activated carbon for energy storage applications
(Nova Science Publishers, Inc., 2024) Madhusree, J.E.; Banerjee, A.; Mal, S.S.
In this book, we discuss the investigation of two different bisphosphonate-functionalized polyoxovanadate compounds for use in electrochemical energy storage applications. The compounds are (NH4)4[H6(VIVO2)(VV2O5)2O3P-C(O)(CH2-2-C5NH4)-PO32].9H2O (m), and (NH4)4[H6(VIVO2)(VV2O5)2O3P-C(O)(CH2-3-C5NH4)-PO32]. 8H2O (n). They have a mixed-valent oxovanadate polyanionic assembly that has two different pyridyl functional groups present on the organic bisphosphonate ligand. Several techniques have been used to characterize composites made from these compounds with activated carbon, including Fourier transform infrared spectroscopy, P-XRD, FESEM, EDX, and surface adsorption-desorption tests. The electrochemical performance of acidic electrolytic solutions containing 0.1 M H2SO4, AC-m, and AC-n electrode materials was investigated. Although the compounds are isotypic mixed-valence polyoxovanadate structures, their electrical behavior varies based on the position of the pyridyl group. AC-n was reported to have the most prominent specific capacitance of 313 F g-1 at a current density of 1 A g-1 in a voltage window of 0-1 V, with exceptional energy and power densities of 43.56 Wh kg-1 and 1999.72 W kg-1, respectively. At the same time, AC-m exhibited a specific capacitance of 212 F g-1 and a specific energy of 29.45 Wh kg-1. By lighting up different LED lights with only 42 mg of carbon clothcoated sample, the composite AC-n electrode displayed exceptional specific power. A further benefit of AC-n nanohybrids is their ability to retain electrochemical performance over time, which suggests long-term stability. © 2024 Nova Science Publishers, Inc. All rights reserved.
A study of starting methods for an induction motor using an arbitrary waveform generator
(2016) Banerjee, A.; Banerjee, A.; Rana, D.P.S.; Shubhanga, K.N.
In this paper the use of an arbitrary waveform generator to generate desired signals in real-time is illustrated by simulating an induction motor operation along with various starting techniques. An off-line digital simulation of an induction motor is carried out on MATLAB/SIMULINK. The resulting sample-data files pertaining to signals such as electromagnetic torque and rotor speed are used in the arbitrary waveform generator to trace waveforms on an oscilloscope in real-time. This arbitrary waveform generator is developed on the Real-Time Application Interface (RTAI) enabled-Linux platform. The paper presents results of some case studies carried out by employing different starting techniques such as direct on-line and star-delta starting methods. Such a tool will be of great help in enhancing the class room learning. � 2015 IEEE.
Supercapacitor activity studies of a unique triangular oxo-vanadate-bisphosphonate composite with activated carbon
(Springer Science and Business Media Deutschland GmbH, 2022) Thakre, D.; Anandan Vannathan, A.; Banerjee, A.; Mal, S.S.
Electrochemical studies have been performed on a hybrid inorganic–organic oxo-vanadate (IV)-bisphosphonate assembly, viz. (NH4)2[H6(VIVO)3(O){O3P-C(OH)(CH2-4-C5NH4)-PO3}3]•26H2O [V3-BP]. The compound has a triangular shaped structure consisting of reduced vanadium (IV) with 1-hydroxo-2-(4-pyridyl) ethylidene-1,1-bisphosphonic acid. Composites of this compound were prepared with activated carbon (AC), viz. AC-V3-BP, and extensively characterized using various analytical techniques (e.g., FT-IR, TGA, P-XRD, FESEM, EDX, and BET) to study the interaction of V3-BP with the activated carbon support. Electrochemical properties of AC-V3-BP were studied, vis-à-vis its supercapacitor behavior, with the electrochemical performance of the composite AC-V3-BP material tested in 0.1 (M) H2SO4 aqueous electrolytic solution. The composite exhibits a specific capacitance of 140.8 F g−1 with a specific energy of 19.56 W kg−1. With such interesting capacitive properties, electrochemical cells prepared with this material were observed to light up red and blue LED bulbs for 90 and 20 s, respectively, suggesting a substantial power density of the materials. The respective electrode prepared from the composite was also observed to retain 79.23% of the electrode stability after 4500 cycles. © 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
The cyclic 48-tungsto-8-phosphate [H7P8W48O184]33− Contant-Tézé polyanion and its derivatives [H6P4W24O94]18− and [H2P2W12O48]12−: structural aspects and reactivity
(Royal Society of Chemistry, 2025) Mal, S.S.; Banerjee, A.; Kortz, U.
Polyoxometalates (POMs) are discrete, anionic metal-oxo clusters of early transition metals in high oxidation states (e.g., WVI, MoVI, VV) usually comprised of edge- and corner-shared MO6 octahedra. Lacunary POMs are defect heteropolyanions mainly of the Keggin or Dawson type, and they can be formed by the loss of one or more MO6 octahedra by controlled base hydrolysis. The largest subclass of POMs are tungstophosphates, and several lacunary derivatives are known, such as the Keggin-based [PW11O39]7− and [PW9O34]9−, and the Dawson-based [P2W17O61]10− and [P2W15O56]12−. This review is based on the cyclic 48-tungsto-8-phosphate [H7P8W48O184]33− (P8W48) as well as its smaller derivatives [H6P4W24O94]18− (P4W24), and [H2P2W12O48]12− (P2W12), with a focus on structural aspects, solution stability and reactivity. All three polyanions can be considered as inorganic multidentate O-donor ligands that coordinate with d, f or p-block metal ions. Here we provide a comprehensive overview of guest metal-containing derivatives of the P8W48 wheel, the P4W24 half-wheel and the P2W12 quarter wheel. The structures containing P2W12 as a building unit are presented in a sequence of increasing number of POM units in the resulting assembly. Transition metal-containing POMs have been of interest for decades due to their remarkable capability of forming novel and unexpected structures associated with interesting and relevant physicochemical properties (e.g., catalysis, magnetism, biomedicine, electrochemistry), and this also applies for derivatives containing P8W48, P4W24 and P2W12 © 2025 The Royal Society of Chemistry.