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406 results on '"Chakraborty, Arun"'

9. Regional Ocean Modeling System (ROMS) Simulations to Identify the Sensitivity of Forcing Conditions on the Thermohaline Features of the Bay of Bengal

Author

Ghoshal, Tarumay, Chakraborty, Arun, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Kumar, Sunil, editor, Ghangrekar, Makarand M., editor, and Kundu, Abhijit, editor

Published
2023
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16. Characterization of hydrogen plasma in a permanent ring magnet based helicon plasma source for negative ion source research

Author

Pandey, Arun, Mukherjee, Debrup, Bandyopadhyay, M., Borah, Dipshikha, Tyagi, Himanshu, Yadav, Ratnakar, and Chakraborty, Arun

Subjects
Physics - Plasma Physics
Abstract

HELicon Experiment for Negative ion source (HELEN-I) with single driver is developed with a focus on the production of negative hydrogen ions. In the Helicon wave heated plasmas, very high plasma densities ($\sim10^{19} m^{-3}$) can be attained with electron temperatures as low as $\sim$1 eV in the downstream region. These conditions favor the production of negative hydrogen ions. In HELEN-I device at IPR, helicon plasma is produced using Hydrogen gas in a diverging magnetic field, created by a permanent ring magnet. RF Power ($P_{RF}$) of 800-1000W at 13.56 MHz frequency is applied to a Nagoya-III antenna to excite m = 1 helicon mode in the plasma. The plasma is confined by a multi-cusp field configuration in the expansion chamber. The transition from inductively coupled mode to Helicon mode is observed near $P_{RF}$ 700W with plasma density $\sim 10^{18} m^{-3}$ and electron temperature $\sim$ 5 eV in the driver and $\sim$ 1eV in the expansion volume. Line integrated negative hydrogen ion density is measured in the expansion chamber by employing an Optical Emission Spectroscopy (OES) diagnostic technique using $H_\alpha/H_\beta$ ratio and Laser photo-detachment based Cavity Ring Down spectroscopic (CRDS) diagnostic technique. The measured value of negative hydrogen ion density is in the order of $10^{16} m^{-3}$ at 6 mTorr pressure and does not vary significantly with power in the helicon mode, pressure and downstream axial magnetic field variation. The negative ion density measurements are compared with theoretically estimated values calculated using particle balance method considering different reaction rates responsible for negative hydrogen ion creation and destruction. It is to be noted that at present Caesium (Cs) is not injected in the plasma discharge to enhance $H^-$ ion density.

Published
2018
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25. Wavelet analysis of discharge and sediment load for the Subarnarekha, Brahmani, and Mahanadi rivers of India.

Author

Imaran, Mohd, Chakraborty, Arun, and Tripathy, Subhasish

Subjects
*SUSPENDED sediments, *RIVER sediments, *WAVELETS (Mathematics), *SEDIMENT transport, *WAVELET transforms
Abstract

This study aims to identify distinct small-scale temporary patterns between the river discharge and suspended sediment load for the main tropical rivers using continuous wavelet transform. Strong annual and irregular semi-annual variabilities, with few quarterly and interdecadal variabilities, are observed in river discharge and sediment load. The wavelet coherence reveals that the strongest in-phase coherence relationships exist between total suspended sediment and streamflow. The methodology for identifying the primary climate factors that integrate the partial wavelet coherence (PWC), multiple wavelet coherence (MWC), and quadruple wavelet coherence (QMWC) techniques is presented. The results show that the El-Nino/Southern Oscillation (ENSO) is the major regulator of streamflow followed by Indian Ocean Dipole (IOD) and Pacific Decadal Oscillation (PDO). The chosen rivers show a statistically significant ($p \le 0.05$p≤0.05) descending trend in sediment load but no significant positive or negative trend in river discharge. This could be due to regional sediment storage and large-scale stream events affecting the sediment transport dynamics. [ABSTRACT FROM AUTHOR]

Published
2024
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27. 1D-3v PIC-MCC Based Modeling and Simulation of Magnetized Low-Temperature Plasmas

Author

Shah, Miral, Chaudhury, Bhaskar, Bandyopadhyay, Mainak, Chakraborty, Arun, Kacprzyk, Janusz, Series Editor, Pal, Nikhil R., Advisory Editor, Bello Perez, Rafael, Advisory Editor, Corchado, Emilio S., Advisory Editor, Hagras, Hani, Advisory Editor, Kóczy, László T., Advisory Editor, Kreinovich, Vladik, Advisory Editor, Lin, Chin-Teng, Advisory Editor, Lu, Jie, Advisory Editor, Melin, Patricia, Advisory Editor, Nedjah, Nadia, Advisory Editor, Nguyen, Ngoc Thanh, Advisory Editor, Wang, Jun, Advisory Editor, Giri, Debasis, editor, Buyya, Rajkumar, editor, Ponnusamy, S., editor, De, Debashis, editor, Adamatzky, Andrew, editor, and Abawajy, Jemal H., editor

Published
2021
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37. Real-Time High-Speed Novel Data Acquisition System Based on ZYNQ

Author

Tyagi, Himanshu, Gajjar, Nagendra P., Bandyopadhyay, Mainak, Chakraborty, Arun, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Liang, Qilian, Series Editor, Martin, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zhang, Junjie James, Series Editor, Kalam, Akhtar, editor, Niazi, Khaleequr Rehman, editor, Soni, Amit, editor, Siddiqui, Shahbaz Ahmed, editor, and Mundra, Ankit, editor

Published
2020
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49. Carbon quantum dots for efficient hydrogen production: A critical review.

Author

Sharma, Mukesh, Kafle, Saroj Raj, Singh, Anju, Chakraborty, Arun, and Kim, Beom Soo

Subjects
CLEAN energy, INTERSTITIAL hydrogen generation, QUANTUM dots, SURFACE passivation, SUSTAINABILITY, CARBON nanofibers
Abstract

Fluorescent carbon nanoparticles, also known as carbon quantum dots (CQDs), have piqued the interest of researchers due to their numerous uses in chemical sensing, biomedical imaging, nanotechnology, photovoltaics, LEDs, and hydrogen generation. Aside from their optical brilliance, CQDs have benefits like low toxicity, environmental friendliness, cost‐effectiveness, and ease of manufacture, with adjustable properties via surface passivation and functionalization. This review article goes over CQDs in‐depth, addressing synthesis advances, benefits, limits, various synthesis processes, and prospective hydrogen generation applications. While CQDs have photocatalytic properties, they confront a few challenges, including low quantum yields, spectrum limitations, photostability limitations, limited catalytic activity, scaling difficulties, and environmental issues. Thorough research is required to use CQDs in sustainable hydrogen generation. Despite obstacles, CQD research remains appealing, with transformational promise for a cleaner and more sustainable energy future through controlled synthesis approaches displaying CQDs' many uses. [ABSTRACT FROM AUTHOR]

Published
2024
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50. Hybrid Parallelization of Particle in Cell Monte Carlo Collision (PIC-MCC) Algorithm for Simulation of Low Temperature Plasmas

Author

Chaudhury, Bhaskar, Shah, Mihir, Parekh, Unnati, Gandhi, Hasnain, Desai, Paramjeet, Shah, Keval, Phadnis, Anusha, Shah, Miral, Bandyopadhyay, Mainak, Chakraborty, Arun, Barbosa, Simone Diniz Junqueira, Editorial Board Member, Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Kotenko, Igor, Editorial Board Member, Yuan, Junsong, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Majumdar, Amit, editor, and Arora, Ritu, editor

Published
2019
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