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5,743 results on '"Tyagi, A. K."'

77. Comparative Prediction of the Influence of Process Parameters During CAEDM and REDM of Hybrid Metal Matrix Composite

Author

Malhotra, Paridhi, Agrawal, Rajeev, Tyagi, R. K., Singh, Nishant, Mehta, Jimmy, Rinawa, Moti Lal, Cavas-Martínez, Francisco, Editorial Board Member, Chaari, Fakher, Series Editor, di Mare, Francesca, Editorial Board Member, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Editorial Board Member, Ivanov, Vitalii, Series Editor, Kwon, Young W., Editorial Board Member, Trojanowska, Justyna, Editorial Board Member, Dikshit, Mithilesh K., editor, Soni, Ashish, editor, and Davim, J. Paulo, editor

Published
2023
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85. Phonons and Lithium diffusion in LiAlO$_2$

Author

Gupta, Mayanak K., Mittal, Ranjan, Singh, Baltej, Delaire, Olivier, Achary, Srungarpu N., Rols, Stephane, Tyagi, Avesh K., and Chaplot, Samrath L.

Subjects
Condensed Matter - Materials Science
Abstract

We report on investigations of phonons and lithium diffusion in LiAlO$_2$ based on inelastic neutron scattering (INS) measurements of the phonon density of states (DOS) in {\gamma}-LiAlO$_2$ from 473 K to 1073 K, complemented with ab-initio molecular dynamics (AIMD) simulations. We find that phonon modes related to Li vibrations broaden on warming as reflected in the measured phonon DOS and reproduced in simulations. Further, the AIMD simulations probe the nature of lithium diffusion in the perfect crystalline phase ({\gamma}-LiAlO$_2$), as well as in a structure with lithium vacancies and a related amorphous phase. Almost liquid-like super-ionic diffusion is observed in AIMD simulations of the three structures at high temperatures; with predicted onset temperatures of 1800 K, 1200 K, and 600 K in the perfect structure, vacancy structure and the amorphous phase, respectively. In the ideal structure, the Li atoms show correlated jumps; while simple and correlated jumps are both seen in the vacancy structure, and a mix of jumps and continuous diffusion occur in the amorphous structure. Further, we find that the Li-diffusion is favored in all cases by a large librational amplitude of the neighbouring AlO4 tetrahedra, and that the amorphous structure opens additional diffusion pathways due to a broad distribution of AlO4 tetrahedra orientations., Comment: 31 Pages, 14 figures

Published
2020
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86. Particle Size and Shape Engineering for Advanced Materials

Author

Ningthoujam, R. S., Tyagi, A. K., Basu, Bikramjit, Editorial Board Member, Amarendra, G., Editorial Board Member, Bhattacharjee, P. P., Editorial Board Member, Gokhale, Amol A., Editorial Board Member, Kamaraj, M., Editorial Board Member, Manna, Indranil, Editorial Board Member, Mishra, Suman K., Editorial Board Member, Muraleedharan, K., Editorial Board Member, Murty, B. S., Editorial Board Member, Murty, S. V. S. Narayana, Editorial Board Member, Padmanabham, G., Editorial Board Member, Philip, John, Editorial Board Member, Prasad, N. Eswara, Editorial Board Member, Prasad, Rajesh, Editorial Board Member, Rajulapati, Koteswara Rao, Editorial Board Member, Reddy, G. Madhusudan, Editorial Board Member, Srinivasan, A., Editorial Board Member, Sudarshan, T. S., Editorial Board Member, Tarafder, S., Editorial Board Member, Tewari, Raghavendra, Editorial Board Member, Upadhya, Anish, Editorial Board Member, Venkatraman, B., Editorial Board Member, Tyagi, A. K., editor, and Ningthoujam, Raghumani S., editor

Published
2022
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87. Inkjet Printing of Nanomaterials and Nanoinks

Author

Jayakumar, O. D., Tyagi, A. K., Basu, Bikramjit, Editorial Board Member, Amarendra, G., Editorial Board Member, Bhattacharjee, P. P., Editorial Board Member, Gokhale, Amol A., Editorial Board Member, Kamaraj, M., Editorial Board Member, Manna, Indranil, Editorial Board Member, Mishra, Suman K., Editorial Board Member, Muraleedharan, K., Editorial Board Member, Murty, B. S., Editorial Board Member, Murty, S. V. S. Narayana, Editorial Board Member, Padmanabham, G., Editorial Board Member, Philip, John, Editorial Board Member, Prasad, N. Eswara, Editorial Board Member, Prasad, Rajesh, Editorial Board Member, Rajulapati, Koteswara Rao, Editorial Board Member, Reddy, G. Madhusudan, Editorial Board Member, Srinivasan, A., Editorial Board Member, Sudarshan, T. S., Editorial Board Member, Tarafder, S., Editorial Board Member, Tewari, Raghavendra, Editorial Board Member, Upadhya, Anish, Editorial Board Member, Venkatraman, B., Editorial Board Member, Tyagi, A. K., editor, and Ningthoujam, Raghumani S., editor

Published
2022
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88. Some characterizations of ideal variants of Hurewicz type covering properties

Author

Bhardwaj, Manoj and Tyagi, B. K.

Subjects
Mathematics - General Topology
Abstract

In this paper, we continue to investigate topological properties of $\mathcal{I}H$ and its two star versions namely $SS \mathcal{I} H$ and $S \mathcal{I} H$. We characterized $\mathcal{I}$-Hurewicz property by $\mathcal{I}$-Hurewicz Basis property and $\mathcal{I}$-Hurewicz measure zero property for metrizable spaces. We also characterized $\mathcal{I}$-Hurewicz property, star-$\mathcal{I}$-Hurewicz property and strongly star-$\mathcal{I}$-Hurewicz property using selection principles.

Published
2019

89. Dynamics of Na Ion in the Amorphous Na2Si2O5 Using Quasielastic Neutron Scattering and Molecular Dynamics Simulations

Author

Gupta, Mayanak K., Mishra, Sanjay K., Mittal, Ranjan, Singh, Baltej, Goel, Prabhatasree, Mukhopadhyay, Sanghamitra, Shukla, Rakesh, Achary, Srungarpu N., Tyagi, Avesh K., and Chaplot, Samrath L.

Subjects
Condensed Matter - Materials Science
Abstract

We have investigated the dynamics of Na ions in amorphous Na2Si2O5, a potential solid electrolyte material for Na-battery. We have employed quasielastic neutron scattering (QENS) technique in the amorphous Na2Si2O5 from 300 to 748 K to understand the diffusion pathways and relaxation timescales of Na atom dynamics. The microscopic analysis of the QENS data has been performed using ab-initio and classical molecular dynamics simulations (MD) to understand the Na-ion diffusion in the amorphous phase. Our experimental studies show that the traditional model, such as the Hall and Ross (H-R) model, fairly well describe the diffusion in the amorphous phase giving a mean jump length of ~3 {\AA} and residence time about 9.1 picoseconds. Our MD simulations have indicated that the diffusion of Na+ ions occurs in the amorphous phase of Na2Si2O5 while that is not observed in the crystalline orthorhombic phase even up to 1100 K. The MD simulations have revealed that in the amorphous phase, due to different orientations of silicon polyhedral units, accessible pathways are opened up for Na+ diffusions. These pathways are not available in the crystalline phase of Na2Si2O5 due to rigid spatial arrangement of silicon polyhedral units., Comment: 24 Pages, 12 figures

Published
2019
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95. Electronic properties of A2Zr2O7 (A= Gd, Nd) ceramic

Author

Masud, Algama, Himanshu, A. K., Pandey, Ratnesh, Lahiri, J., Das, Nisith, Singh, Bijay K, Bhattacharyya, Kaustava, Kumar, Ravi, and Tyagi, A. K.

Subjects
Condensed Matter - Materials Science
Abstract

The density functional theory with generalized gradient approximation has been used to investigate the electronic structure of gadolinium pyrochlore A2Zr2O7 (A=Gd, Nd) ceramic synthesized in polycrystalline form by solid state reaction. Structural characterization of the compound was done through X-ray diffraction (XRD) followed by Rietveld analysis of the XRD pattern. The Zr-K edge X-ray absorption (XAFS) spectra of A2Zr2O7 (A=Gd, Nd) were analysed together with those Zr-foil, which was used as reference compounds. X-ray photoemission spectroscopy (XPS), X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS) for A2Zr2O7 (A=Gd, Nd) has been employed to obtain quantitative structural information on the Zr-local environment. The band gap is estimated using UV-Vis spectroscopy. The crystal structure is face centered cubic, space group being Fd-3m (No. 227). The total energies in this work were calculated using the generalized gradient approximation to DFT plus on-site repulsion (U) method., Comment: 4 figures, 2 table

Published
2019

97. Game Theory-Based Proof of Stake Mining in Blockchain for Sustainable Energy Efficiency

Author

Tyagi, Nitin K., Goyal, Mukta, Kumar, Adarsh, 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, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, 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, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Sanyal, Goutam, editor, Travieso-González, Carlos M., editor, Awasthi, Shashank, editor, Pinto, Carla M.A., editor, and Purushothama, B. R., editor

Published
2022
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99. Emission Reduction from Diesel Engine Using Alkali Solution, and Carbon Black in Union with Catalytic Convertor

Author

Bhandwal, Mohit, Tyagi, R. K., Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, di Mare, Francesca, Series Editor, Govindan, Kannan, editor, Kumar, Harish, editor, and Yadav, Sanjay, editor

Published
2022
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100. Effect of Process Parameters on Machining of D2 Steel Using Taguchi Method

Author

Somani, Nalin, Tyagi, Y. K., Kumar, Parveen, Cavas-Martínez, Francisco, Series Editor, Chaari, Fakher, Series Editor, Gherardini, Francesco, Series Editor, Haddar, Mohamed, Series Editor, Ivanov, Vitalii, Series Editor, Kwon, Young W., Series Editor, Trojanowska, Justyna, Series Editor, di Mare, Francesca, Series Editor, Dubey, Avanish Kumar, editor, Sachdeva, Anish, editor, and Mehta, Munish, editor

Published
2022
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