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Start Over Author "A. Sen Gupta" Publisher elsevier b.v.
248 results on '"A. Sen Gupta"'

2. Eco-phenological drivers of black gram (Vigna mungo (L) Hepper) productivity in diverse environments and their implications for crop improvement

Author

Parihar, Ashok K., Hazra, Kali Krishna, Lamichaney, Amrit, Sen Gupta, Debjyoti, Singh, Anil K., Dev, Jai, Jaberson, Samuel, Lone, Ajaj A., Das, S.P., Bindra, Shayla, Panwar, R.K., Kumar, Ashok, Das, Arpita, Borah, H.K., Mahto, C.S., Nath, Shiva, Mishra, S.B., Rai, Geeta, Vaidya, E.R., Parikh, Mangala, Tiwari, Smita, Singh, Khajan, Patel, M.P., Ram, Lekha, Rajput, S.D., Patil, D.K., Sassikumar, D., Mogali, Suma, Das, Sujata, Senapati, M., Manimaran, R., Sidramappa, Devi, K. Rukmini, Singh, I.P., and Dixit, G.P.

Published
2025
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32. Prospects of energy-efficient power generation system with ammonia as hydrogen carrier.

Author

Roy, Aritra, Sen Gupta, Soumyajit, Samanta, Arunkumar, Sai Likhith, P.V.S., and Das, Sandipan Kumar

Subjects
*POWER plants, *FLUIDIZED bed reactors, *TUBULAR reactors, *LEAN combustion, *AMMONIA, *HYDROGEN, *COMPRESSED air
Abstract

This paper explores a novel method of focuses on utilizing ammonia as a hydrogen carrier that can be decomposed to produce hydrogen, the combustion of which produces steam for generating power in turbines. The simulation for such a process is performed on ASPEN Plus software. The key steps include compressing the ammonia and passing it through a fluidized bed reactor (FBR) for its decomposition, subsequently compressing the products before combusting the hydrogen with compressed air in a combustor and extracting power from the hot products through a series of turbines. The article examines in detail the effect of different parameters on the performance of the individual components as well as the overall process. Specifically, considerable emphasis is placed on the effects of varying pressures and temperatures on the functioning of the FBR at different catalyst loadings, their effects on the combustor performance and the dependence of the overall process on the air flowrate in the combustor. The comprehensive analysis elucidated on the energy efficiency of the process and it identified conditions at 2 bar pressure and 550 °C temperature as being the most favorable for ammonia decomposition and subsequent turbine power output while lean hydrogen combustion with excess air making the inlet hydrogen concentration less than 20% resulted in optimum temperatures at the turbine inlet. • The paper explores ammonia as a hydrogen carrier in the power plant industry through ASPEN PLUS process simulations. • The initial step is to decompose ammonia into nitrogen and hydrogen in a fluidized bed reactor, the optimum operating condition of which turns out to be 2 bar pressure and 550 °C. • The next steps involve mixing air with the decomposition products, pressurizing them to 40-60 bar, combusting hydrogen in a plug flow reactor to produce steam and finally expanding it in a series of turbines to generate power. • Detailed flow and more importantly, energy analysis of all the process units show ammonia as a very effective hydrogen carrier for applications in power plants. [ABSTRACT FROM AUTHOR]

Published
2024
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48. Baseline matters: Challenges and implications of different marine heatwave baselines.

Author

Smith, Kathryn E., Sen Gupta, Alex, Amaya, Dillon, Benthuysen, Jessica A., Burrows, Michael T., Capotondi, Antonietta, Filbee-Dexter, Karen, Frölicher, Thomas L., Hobday, Alistair J., Holbrook, Neil J., Malan, Neil, Moore, Pippa J., Oliver, Eric C.J., Richaud, Benjamin, Salcedo-Castro, Julio, Smale, Dan A., Thomsen, Mads, and Wernberg, Thomas

Subjects
*CLIMATE change adaptation, *MARINE heatwaves, *CLIMATE extremes, *OCEAN temperature, *MARINE west coast climate
Abstract

• Marine Heatwaves (MHW) can be defined relative to different baselines. • The baselines determine whether long term warming is included or excluded. • Different baselines convey different levels of changing risk for marine species. • The choice of baseline should be carefully considered to best fit the application. Marine heatwaves (MHWs), prolonged periods of unusually high ocean temperatures, significantly impact global ecosystems. However, there is ongoing debate regarding the definition of these extreme events, which is crucial for effective research and communication among marine scientists, decision-makers, and the broader public. Fundamental to all MHW analyses is a clearly defined background oceanic climate – i.e., a temperature 'baseline' against which the MHW is defined. While a single approach to implementing a baseline may not be suitable for all MHW research applications, the choice of a baseline for analysing MHWs must be intentional as it affects research outcomes. This perspective examines baseline choices and discusses their implications for marine organism and ecosystem risks, and their relevance in communicating MHW characteristics and metrics to stakeholders, policymakers, and the public. In particular we analyse five different baseline approaches for computing MHW statistics, assess their technical differences, and discuss their ecological implications. Different baselines suggest widely different trends in MHW characteristics in a warming world. This would, for example, imply differences in future risk, reflective of marine organisms with different adaptive potential, thereby affecting recommendations for management strategies. We also examine the consequences of different baseline choices on ease of implementation and communication with wider audiences. Our analyses highlight the need to clearly specify a chosen baseline in MHW studies, and to be mindful of its implications for MHW statistics, practical considerations, and interpretations concerning the adaptive capacities of marine organisms, ecosystems and human systems. The challenges and implications of different MHW baselines highlighted here have similar relevance in research and communication for other branches of climate extremes. [ABSTRACT FROM AUTHOR]

Published
2025
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