Faculty Publications
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Item Photo-electrochemical green-hydrogen generation: Fundamentals and recent developments(Elsevier Ltd, 2024) Baiju, S.; Masuda, U.; Datta, S.; Tarefder, K.; Chaturvedi, J.; Ramakrishna, S.; Tripathi, L.N.Scalable, cost-effective production and earth-abundant material platforms for clean energy sources such as green hydrogen are key research problems. Understanding the fundamentals is the basis of the advancement of research in green hydrogen production. Quantum materials such as two-dimensional materials are emerging material platforms for green-hydrogen generation. Quantum mechanical tools such as density functional theory play a crucial role in understanding quantum phenomena hence improving the efficiency of hydrogen production from the quantum materials. In this review article, we discuss the basic principles of green hydrogen generation using photo-electrochemical water splitting. The methods to evaluate the catalytic activity of the catalysts are discussed in detail. A broad classification of the photo/electro-catalysts for water splitting is further elaborated. We discuss methods to enhance the performance of the catalysts by doping the hetero-atoms, and the synergic effects of using other nanomaterials such as quantum dots and plasmonic nanostructures. The concept of electron transfer enhancement due to magnetic nanostructures is also discussed in detail. The introduction and application of surface plasmons for enhanced hydrogen generation are also discussed. Finally, we discuss the application of hydrogen in a fuel cell for the generation of electricity. © 2023 Hydrogen Energy Publications LLCItem Microstructure and corrosion behavior of laser processed NiTi alloy(Elsevier Ltd, 2015) Marattukalam, J.J.; Singh, A.K.; Datta, S.; Das, M.; Balla, V.K.; Bontha, S.; Kalpathy, S.K.Abstract Laser Engineered Net Shaping (LENS™), a commercially available additive manufacturing technology, has been used to fabricate dense equiatomic NiTi alloy components. The primary aim of this work is to study the effect of laser power and scan speed on microstructure, phase constituents, hardness and corrosion behavior of laser processed NiTi alloy. The results showed retention of large amount of high-temperature austenite phase at room temperature due to high cooling rates associated with laser processing. The high amount of austenite in these samples increased the hardness. The grain size and corrosion resistance were found to increase with laser power. The surface energy of NiTi alloy, calculated using contact angles, decreased from 61 mN/m to 56 mN/m with increase in laser energy density from 20 J/mm2 to 80 J/mm2. The decrease in surface energy shifted the corrosion potentials to nobler direction and decreased the corrosion current. Under present experimental conditions the laser power found to have strong influence on microstructure, phase constituents and corrosion resistance of NiTi alloy. © 2015 Elsevier B.V.Item A TODIM-Based Decision Support Framework for G-Resilient Supplier Selection in Fuzzy Environment(World Scientific Publishing Co. Pte Ltd wspc@wspc.com.sg, 2016) Sen, D.K.; Datta, S.; Mahapatra, S.S.A novel decision support framework has been proposed herein to solve supplier selection problems by considering green as well as resiliency criteria, simultaneously. In this work subjectivity of evaluation criteria has been tackled by exploring fuzzy set theory. A dominance based approach has been conceptualized which is basically a simplified version of TODIM. Application potential of the proposed dominance based fuzzy decision making approach has been compared to that of fuzzy-TOPSIS, fuzzy-VIKOR and also fuzzy-TODIM. The concept of a unique performance index, i.e. "g-resilient" index has been introduced here to help in assessing suppliers' performance and thereby selecting the best candidate. The work has also been extended to identify the areas in which suppliers are lagging; these seek further improvement towards g-resilient suppliers' performance to be boosted up to the desired level. © 2016 World Scientific Publishing Co.Item ESMA: Towards elevating system happiness in a decentralized serverless edge computing framework(Academic Press Inc., 2024) Datta, S.; Addya, S.K.; Ghosh, S.K.Due to the rapid growth in the adoption of numerous technologies, such as smartphones and the Internet of Things (IoT), edge and serverless computing have started gaining momentum in today's computing infrastructure. It has led to the production of huge amounts of data and has also resulted in increased network traffic, which if not managed well can cause network congestion. To address this and maintain the quality of service (QoS), in this work, a novel dispatch (destination selection) algorithm called Egalitarian Stable Matching Algorithm (ESMA) for faster data processing has been developed while also considering the best use of server resources in a decentralized Serverless-Edge environment. This will allow us to effectively utilize the enormous volumes of data that are generated. The proposed algorithm has been able to achieve lower overall dissatisfaction scores for the entire system. Individually, the client's happiness as well as the server's happiness have improved over the baseline. Moreover, there has been a drop of 25.7% in the total execution time and the total network resources consumed are lower as compared to the baseline algorithm as well as random-allocation algorithm. © 2023 Elsevier Inc.