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18 results on '"Durgesh, R."'

1. ELEPHANT: ExtragaLactic alErt Pipeline for Hostless AstroNomical Transients

Author

Pessi, P. J., Durgesh, R., Nakazono, L., Hayes, E. E., Oliveira, R. A. P., Ishida, E. E. O., Moitinho, A., Krone-Martins, A., Moews, B., de Souza, R. S., Beck, R., Kuhn, M. A., Nowak, K., and Vaughan, S.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena
Abstract

Context. Transient astronomical events that exhibit no discernible association with a host galaxy are commonly referred to as hostless. These rare phenomena are associated with extremely energetic events, and they can offer unique insights into the properties and evolution of stars and galaxies. However, the sheer number of transients captured by contemporary high-cadence astronomical surveys renders the manual identification of all potential hostless transients impractical. Therefore, creating a systematic identification tool is crucial for studying these elusive events. Aims. We present the ExtragaLactic alErt Pipeline for Hostless AstroNomical Transients (ELEPHANT), a framework for filtering hostless transients in astronomical data streams. Methods. We used Fink to access all the ZTF alerts produced between January/2022 and December/2023, selecting only those associated with extragalactic transients. We then processed the associated stamps using a sequence of image analysis techniques to retrieve hostless candidates. Results. We find that less than 2% of all analyzed transients are potentially hostless. Among them, approximately 10% have a spectroscopic class reported on TNS, with Type Ia supernova being the most common class, followed by SLSN. Among the hostless candidates retrieved by our pipeline, there was SN 2018ibb, which has been proposed to be a PISN candidate; and SN 2022ann, one of only five known SNe Icn. When no class is reported on TNS, the dominant classes are QSO and SN candidates, the former obtained from SIMBAD and the latter inferred using the Fink ML classifier. Conclusions. ELEPHANT represents an effective strategy to filter extragalactic events within large and complex astronomical alert streams. There are many applications for which this pipeline will be useful, ranging from transient selection for follow-up to studies of transient environments., Comment: 15 pages, 11 figures

Published
2024

2. Ultimate Shear Resistance of Non-rigid End Post Steel Plate Girders

Author

Hingnekar, Durgesh R., Vyavahare, Arvind Y., 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, Madhavan, Mahendrakumar, editor, Davidson, James S., editor, and Shanmugam, N. Elumalai, editor

Published
2024
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10. Neem gum and Pongamia pinnataplant leaves bio-extract assisted green synthesis and characterization of zirconia nanoparticles

Author

Raut, Surabhi, Dhakar, Gopal Lal, Gogoi, Pretty, Pal, Durgesh R., and Das, Chayan

Abstract

The present study reports synthesis of zirconia nanoparticles (Zr) via hydrothermal method where bio-extracts of Neem gum (NG) and Pongamia pinnataplant leaves (PP) are used as capping agents. For comparison purpose, the zirconia nanoparticles (CZr) are also synthesized by chemical route without using capping agents. Synthesized zirconia nanoparticles are characterized by XRD, FTIR, HR-TEM, EDX, and DLS. The purity of the final product is checked by the energy-dispersive X-ray spectroscopy (EDX) analysis. Interaction between surface hydroxyl groups of zirconia and functional groups of PP/NG are established by relocation of the peaks of respective functional groups in FTIR spectra. XRD studies show that the synthesized nanoparticles are of tetragonal phase. HR-TEM micrographs reveal uniform size with reduced agglomeration for PPZr and NGZr in respect to CZr. UV–Vis DRS spectra show a distinct absorption peak at approximately 225 nm, and band gaps of PPZr and NGZr are 4.96 eV and 4.75 eV, respectively. The nitrogen adsorption–desorption study confirms mesoporous nature of the material. The specific surface area of PPZr and NGZr are determined to be 80 m2/g and 100 m2/g, respectively. The zirconia nanoparticles show high dielectric constants in the lower frequency region. While, on the high-frequency side, the dielectric constant remains almost the same, owing to the space polarization effect.

Published
2023
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12. Mechanical and microstructural testing of C-45 material welded by using SMAW and GMAW process

Author

Aamir R. Sayed, Usha M. Bharadkar, Atul R. Ramteke, Rushikesh Y. Bhanarkar, Durgesh R. Dhande, Devesh Kumar, Nitin N Nawkhare, and Gulshan M. Shahare

Subjects
010302 applied physics, Materials science, Metallurgy, Weldability, Shielded metal arc welding, 02 engineering and technology, Dye penetrant inspection, Welding, 021001 nanoscience & nanotechnology, 01 natural sciences, Pressure vessel, Gas metal arc welding, law.invention, law, 0103 physical sciences, Electrode, 0210 nano-technology, Tensile testing
Abstract

Welding is commonly used for joining of metals and alloys at cost-effective ways in various industries. In present exploration, tensile testing, microstructural analysis and dye penetration test (DPT) was done on C45 (AISI 1045) alloy. The main objective is to generate the weldability of C45 alloy. There was pre and post weld heat treatment (PWHT) on the C45 material. In the existing work, Gas Metal Arc Welding (GMAW) and Shielded Metal Arc Welding (SMAW) processes were used. The selection of the electrodes and welding sample preparation is according to American Society for Welding (ASW) clauses A5.1 and A5.5 and the American Society of Mechanical Engineers (ASME) pressure vessel codes. There were 3 types of electrodes namely as E7018, E9018 and ER70S-6 electrodes for welding of specimen and achieved the comparison between them. The work concluded in the achieving the tensile properties, microstructural property and DPT for different types of welding and different types of electrodes on the specimen of 16 mm thick plate of C45 (AISI 1045) and is appropriate to all the industries.

Published
2021

13. Synthesis and characterization of nanocrystalline Ce0.9Gd0.1O2-δ powders with ameliorated ionic conductivity by citrate combustion route.

Author

Pal, Durgesh R. and Kant, K. Mohan

Subjects
IONIC conductivity, CITRATES, POWDERS, METAL nitrides, COMBUSTION, IMPEDANCE spectroscopy, HEAT treatment
Abstract

Nanocrystalline Ce0.9Gd0.1O2-δ powders were prepared through a Citrate combustion process using citric acid as fuel in ratio of metal nitrides of 2:1. As prepared Ce0.9Gd0.1O2-δ is heat treated different calcinating temperature. Structural, thermal and electrical transport properties of Ce0.9Gd0.1O2-δ powders were studied with the help of X-ray diffraction (XRD), Thermogravimetry analysis, Transmission electron microscopy, Raman spectroscopy and Electrochemical impedance spectroscopy. X-ray diffraction patterns confirmed the formation of pure-phase fluorite structured Ce0.9Gd0.1O2-δ. The relative densities of prepared Ce0.9Gd0.1O2-δ powders were in the range of 92% to 96%. The average particle sizes ranged from 7 ± 0.21 nm to 19 ± 0.49 nm, with an increase in calcinating temperature from 300 ºC to 700 °C. Ce0.9Gd0.1O2-δ sintered at 1200 °C for 36 h exhibited ionic conductivity of 0.022 ± 0.004 Scm− 1 in the air at 800 C. This study indicates that Ce0.9Gd0.1O2-δ powder with high ionic conductivity is prepared using the citrate combustion method. [ABSTRACT FROM AUTHOR]

Published
2023
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15. Mechanics of Shear Resistance in Steel Plate Girder: Critical Review

Author

Arvind Y. Vyavahare and Durgesh R. Hingnekar

Subjects
business.industry, Mechanical Engineering, Plate girder, Shear resistance, Web panel, Building and Construction, Structural engineering, Mechanics, Transverse plane, Shear (geology), Mechanics of Materials, Girder, General Materials Science, business, Geology, Civil and Structural Engineering
Abstract

This paper highlights the challenges before researchers who are working to understand the postbuckling mechanics of a stiffened web panel, design of transverse stiffener, mechanics of end p...

Published
2020

18. Interface-Centric Strategies in Kesterite Solar Cells: Addressing Challenges, solutions, and Future Directions for Efficient Solar-Harvesting Technologies.

Author

Jagadish K, Rahane GK, Kumar BS, Borkar DR, Chordiya K, Kavanagh SR, Roy A, Debnath T, Kolekar S, Kahaly MU, Mali SS, Pal S, Gasparini N, Dubal DP, and Rondiya SR

Abstract

As reserves of non-renewable energy sources decline, the search for sustainable alternatives becomes increasingly critical. Next-generation energy materials play a key role in this quest by enabling the manipulation of properties for effective energy solutions and understanding interfaces to enhance energy yield. Studying these interfaces is essential for managing charge transport in optoelectronic devices, yet it presents significant challenges. This review emphasizes the critical role of interfaces in kesterite solar cells (KSCs), focusing on interfacial architecture, carrier losses, and non-radiative recombination. This review highlights the importance of addressing interface issues and utilizing advanced characterization tools to reveal interface properties. Current interface problems are addressed, recent advancements in interface engineering are summarized, and perspectives on future challenges and prospects are offered. The goal is to illuminate the nature of interfaces and tackle interface losses, which are crucial for improving device design and performance. Despite their pivotal role in device operation, comprehensive reviews on interfaces are lacking, underscoring the relevance of the work for researchers in material interfaces and device engineering. It is hoped that this article will spark interest and inspire further research into interface studies and the mitigation of interface losses., (© 2024 Wiley‐VCH GmbH.)

Published
2024
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