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626 results on '"Gupta, Ashish Kumar"'

17. Seismic Response Analysis of Reinforced Concrete Chimneys with Tuned Mass Damper

Author

Gupta, Ashish Kumar, Bhadauria, Sudhir Singh, Rawat, Aruna, 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, Cui, Zhen-Dong, Series Editor, Gencel, Osman, editor, Balasubramanian, M., editor, and Palanisamy, T., editor

Published
2024
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18. Frequency Analysis of Self-supported Steel Chimneys

Author

Gupta, Ashish Kumar, Bhadauria, Sudhir Singh, Rawat, Aruna, 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, Pathak, Krishna Kant, editor, Bandara, J. M. S. J., editor, and Agrawal, Ramakant, editor

Published
2024
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19. A unique approach to address avoided crossings in the charge stabilization curve for LUMO identification.

Author

Kumar, Deepak and Gupta, Ashish Kumar

Subjects
*FRONTIER orbitals, *QUANTUM chemistry, *NUCLEAR charge, *PARAMETRIC equations, *EQUATIONS of motion
Abstract

In quantum chemistry, Lowest Unoccupied Molecular Orbital (LUMO) is important for studying various chemical processes, including photochemical reactions, electron attached states, and electron excites states. Recently, an effective method has been introduced that involves the use of the Parametric Equation of Motion (PEM) in conjunction with the nuclear charge stabilization method for precise identification of true LUMO. However, the inclusion of extra diffuse functions in the basis set, which is necessary for describing electron-attached and electron-excited states, can cause issues due to the presence of the same symmetry states, leading to avoided crossing. Identifying the true LUMO among these avoided crossings is challenging due to the mixing of states and the exchange of their orbital character. This article introduces a modification of the PEM to identify the true LUMO by preventing the stabilization of specific states involved in avoided crossings. The present method is highly effective and requires minimal computational cost. [ABSTRACT FROM AUTHOR]

Published
2024
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20. Length Dependence thermal conductivity of Zinc-Selenide (ZnSe) and Zinc Telluride (ZnTe)- A combined first principles and Frequency Domain Thermoreflectance (FDTR) study

Author

Muthaiah, Rajmohan, Annam, Roshan Sameer, Tarannum, Fatema, Gupta, Ashish Kumar, Garg, Jivtesh, Sachan, Ritesh, and Arafin, Shamsul

Subjects
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics
Abstract

In this study, we report the length dependence of thermal conductivity (k) of zinc-blende Zinc-Selenide (ZnSe) and Zinc Telluride (ZnTe) for length scales between 10 nm and 10000 nm using first-principles computations based on density-functional theory. k value of ZnSe is computed to decrease significantly from 11.3 W/mK to 1.75 W/mK as the length scale is diminished from 10 nm to 10 nm. k value of ZnTe is also observed to decrease from 10 W/mK to 1.2 W/mK for the same decrease in length. We also measure the k of bulk ZnSe and ZnTe using Frequency Domain Thermoreflectance (FDTR) technique and observed a good agreement between FDTR measurements and first principles calculations for the bulk ZnSe and ZnTe. Understanding of thermal conductivity reduction at nanometer length scales provides an avenue to incorporate nanostructured ZnSe and ZnTe for thermoelectric applications., Comment: 19 pages, 13 figures

Published
2022
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26. A Contrastive Learning Approach for Infrared-Visible Image Fusion

Author

Gupta, Ashish Kumar, Barnwal, Meghna, Mishra, Deepak, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Maji, Pradipta, editor, Huang, Tingwen, editor, Pal, Nikhil R., editor, Chaudhury, Santanu, editor, and De, Rajat K., editor

Published
2023
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40. Advances in Nickel-Containing High-Entropy Alloys: From Fundamentals to Additive Manufacturing.

Author

Gupta, Ashish Kumar, Choudhari, Amit, Rane, Aditya, Tiwari, Abhishek, Sharma, Prince, Gupta, Ashutosh, Sapale, Prathamesh, Tirumala, Ravi Teja A., Muthaiah, Rajmohan, and Kumar, Abhishek

Subjects
*ELECTRON beam furnaces, *MECHANICAL behavior of materials, *SELECTIVE laser melting, *HEAT treatment, *CONDUCTION electrons
Abstract

High-entropy alloys (HEAs) are recognized as a class of advanced materials with outstanding mechanical properties and corrosion resistance. Among these, nickel-based HEAs stand out for their impressive strength, ductility, and oxidation resistance. This review delves into the latest advancements in nickel-containing HEAs, covering their fundamental principles, alloy design strategies, and additive manufacturing techniques. We start by introducing HEAs and their unique properties, emphasizing the crucial role of nickel. This review examines the complex relationships between alloy composition, valence electron concentration (VEC), and the resulting crystal structures. This provides insights into design principles for achieving desired microstructures and mechanical properties. Additive manufacturing (AM) techniques like selective laser melting (SLM), electron beam melting (EBM), and laser metal deposition (LMD) are highlighted as powerful methods for fabricating intricate HEA components. The review addresses the challenges of AM processes, such as porosity, fusion defects, and anisotropic mechanical properties, and discusses strategies to mitigate these issues through process optimization and improved powder quality. The mechanical behavior of AM-processed nickel-based HEAs is thoroughly analyzed, focusing on compressive strength, hardness, and ductility. This review underscores the importance of microstructural features, including grain size, phase composition, and deformation mechanisms, in determining the mechanical performance of these alloys. Additionally, the influence of post-processing techniques, such as heat treatment and hot isostatic pressing (HIP) on enhancing mechanical properties is explored. This review also examines the oxidation behavior of nickel-containing HEAs, particularly the formation of protective oxide scales and their dependence on aluminum content. The interplay between composition, VEC, and oxidation resistance is discussed, offering valuable insights for designing corrosion resistant HEAs. Finally, this review outlines the potential applications of nickel-based HEAs in industries such as aerospace, automotive, and energy, and identifies future research directions to address challenges and fully realize the potential of these advanced materials. [ABSTRACT FROM AUTHOR]

Published
2024
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