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1,247 results on '"Agrawal, G."'

4. Performance Comparison of Silica Gel and Natural Desiccant Material-Based Evaporative Cooling System

Author

Shukla, Sandeep, Misra, Rohit, Agrawal, G. D., 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, Mishra, Debi Prasad, editor, Dewangan, Ashok Kumar, editor, and Singh, Achhaibar, editor

Published
2023
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6. Radiology reporting of incidental osteoporotic vertebral fragility fractures present on CT studies: results of UK national re-audit

Author

Barrett, A., Chandegra, A., Dabbas, A., Dhillon, A., Elstob, A., Kamalasanan, A., Mirza, A., Mohamed, A., Neelakantan, A., Paddon, A., Patel, A., Radhakrishnan, A., Shah, A., Shenton, A., Teibe, A., Dharmarajah, B., Chisholm, C., Cummins, C., Dick, C., Hauff, C., McKeown, C., O'Mahony, C., Campbell, D., Howarth, D., Kitsos, D., Temperley, D., Hubraq, A., Adiotomre, E., Gerety, E., Jackson, E., Skondras, E., Barley, F., Chinwalla, F., Haque, F., Williams, F., Witham, F., Agrawal, G., Tse, G., Tudor, G., Conley, H., Halbert, H., Kolanjian, H., Moss, H., Anwar, I., Ghany, J., Green, J., Hare, J., Howard, J., Jalli, J., Lastik, J., Moloney, J., Taylor, J., Walker, J., Warner, J., Wylie, J., J-Y Chan, Asante, K., Faraj, K., Harrison, K., Hodnett, K., Hussain, K., Karamani, K., Muir, K., Patel, K., Shirodkar, K., Singh, K., Tan, K., Taylor, K., Boyce, L., Chandrasekharan, L., Abdallah, M., Alkhouly, M., Bodoceanu, M., Brochwicz-Lewinski, M., Clark, M., Drumea, M., Fahmy, M., Hassan, M., Kamal, M., Kay, M., Mohan, M., Portet, M., Sampson, M., Siddiqui, M., Srivastava, M., Szewczyk-Bieda, M., Tapp, M., Hattangadi, N., Lyle, N., Matcham, N., Cram, O., Thomas, O., Govind, P., Patel, P., Sharma, P., Vasanthraj, P., Blacow, R., Dwarkanath, R., Frost, R., Gray, R., Greenhalgh, R., Gupta, R., Holmes, R., Jagdale, R., Patel, R., Smyth, R., Thiagarajah, R., Walker, R., Atwal, S., Cordell, S., David, S., Gaba, S., Green, S., Hashem, S., Kanan, S., Kaneria, S., Leach, S., Lim, S., Meena, S., Patel, S., Singh, S., Thampy, S., Amies, T., Ninan, T., Thomas, T., Bhopal, U., Raja, U., Dhir, V., Gnanananthan, V., Rao, V., Pang, W., Wu, Y., Arnold, T., Howlett, D.C., Drinkwater, K.J., Mahmood, N., Salman, L., Griffin, J., Javaid, M.K., Retnasingam, G., and Marzoug, A.

Published
2023
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8. Implications of a zero-nonlinearity wavelength in optical fibers doped with silver nanoparticles

Author

Bose, S., Roy, S., Chattopadhyay, R., Bhadra, S. K., and Agrawal, G. P.

Subjects
Physics - Optics
Abstract

Photonic crystal fibers doped with silver nanoparticles exhibit the Kerr nonlinearity that can be positive or negative depending on wavelength and vanishes at a specific wavelength. We study numerically how the simultaneous presence of a zero-nonlinearity wavelength (ZNW) and a zero-dispersion wavelength affects evolution of soliton and supercontinuum generation inside such fibers and find a number of unique features. The existence of negative nonlinearity allows soliton formation even in the normaldispersion region of the fiber, and the ZNW acts as a barrier for the Raman-induced red shift of solitons., Comment: This paper has been withdrawn by the author due to some major modifications

Published
2016
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10. Specialty Fibers for Terahertz Generation and Transmission: A Review

Author

Barh, Ajanta, Pal, B. P., Agrawal, G. P., Varshney, R. K., and Rahman, B. M. A.

Subjects
Physics - Optics
Abstract

Terahertz (THz) frequency range, lying between the optical and microwave range covers a significant portion of the electro-magnetic spectrum. Though its initial usage started in the 1960s, active research in the THz field started only in the 1990s by researchers from both optics and microwaves disciplines. The use of optical fibers for THz application has attracted considerable attention in recent years. In this article, we review the progress and current status of optical fiber-based techniques for THz generation and transmission. The first part of this review focuses on THz sources. After a review on various types of THz sources, we discuss how specialty optical fibers can be used for THz generation. The second part of this review focuses on the guided wave propagation of THz waves for their transmission. After discussing various wave guiding schemes, we consider new fiber designs for THz transmission., Comment: 15 pages

Published
2015

13. Design of an efficient Mid-IR light source using As2S3 based highly nonlinear microstructured optical fibers

Author

Barh, A., Ghosh, S., Agrawal, G. P., Varshney, R. K., Aggarwal, I. D., and Pal, B. P.

Subjects
Physics - Optics
Abstract

We report on the design of a highly-nonlinear specialty fiber as a mid-infrared light source at 4.3 {\mu}m. A meter length of the designed solid-core chalcogenide based index-guided microstructured optical fiber (MOF) with circular air holes has been exploited to translate wavelength via four wave mixing using a thulium-doped fiber laser as the pump with a relatively low peak power of 5 W. A peak gain value of around 37 dB with full width at half maxima (FWHM) less than 3 nm is achieved., Comment: 4 pages 9 figures

Published
2012

14. Transverse localization of light and its dependence on the phase-front curvature of the input beam in a disordered optical waveguide lattice

Author

Ghosh, S, Pal, B P, Varshney, R K, and Agrawal, G P

Subjects
Physics - Optics
Abstract

We investigate the influence of the phase-front curvature of an input light beam on the transverse localization of light by choosing an evanescently coupled disordered one-dimensional semi-infinite waveguide lattice as an example. Our numerical study reveals that a finite phase front curvature of the input beam indeed plays an important role and it could degrade the quality of light localization in a disordered dielectric structure. More specifically, a faster transition from ballistic mode of beam propagation due to diffraction to a characteristic localized state is observed in case of a continuous wave (CW) beam, whose phase-front is plane as compared to one having a curved phase front., Comment: 5 pages 5 figures

Published
2012
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28. List of contributors

Author

Agrawal, G., primary, Altomare, L., additional, Ambrosio, L.A., additional, Barrias, C.C., additional, Bertoldi, S., additional, Borzacchiello, A., additional, Brunella, M.F., additional, Candiani, G., additional, Dash, M., additional, De Nardo, L., additional, Draghi, L., additional, Dragostin, O., additional, Drouin, B., additional, Farè, S., additional, Giupponi, E., additional, Gonçalves, I.C., additional, Haugen, H.J., additional, Jarząbek, D., additional, Mantero, S., additional, Mantovani, D., additional, Meghezi, S., additional, Meskinfam, M., additional, Michałowski, M., additional, Mireles, L.K., additional, Negi, Y.S., additional, Neves, S.C., additional, Pradhan, S., additional, Profire, L., additional, Rajamani, S., additional, Riboldi, S.A., additional, Sala, F. Della, additional, Samal, S.K., additional, Serafini, A., additional, Sousa, A., additional, Tanzi, M.C., additional, and Yahia, L'H., additional

Published
2017
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31. Synergism of CD28 Immune Molecule in Late Immunosuppressive Phase of COVID-19: Effectiveness in Vaccinated Individuals.

Author

Alharbi, KS, Singh, Y, Prasad Agrawal, G, Altowayan, WM, Almalki, WH, Sharma, A, Singh, SK, Jha, NK, Chellappan, DK, Dua, K, Gupta, G, Alharbi, KS, Singh, Y, Prasad Agrawal, G, Altowayan, WM, Almalki, WH, Sharma, A, Singh, SK, Jha, NK, Chellappan, DK, Dua, K, and Gupta, G

Abstract

CONTEXT: Lymphopenia has been frequently documented and linked to coronavirus disease 2019 (COVID-19) in a severe acute respiratory syndrome (SARS)-coronavirus 2 (CoV-2) attack. A decrease in the T-lymphocyte count has shown promise as a clinical indicator and predictor of COVID-19 severity. OBJECTIVE: The review intended to examine the relationship of COVID-19 infections in individuals to lost expression of CD28 on naive CD4+/CD8+-mediated, vaccine-specific, neutralizing antibody responses. DESIGN: The research team performed a narrative review by searching eight databases: Medline, Elsevier, Cochrane, PubMed, Google Scholar, Mendeley, and Springer Nature. The search used the following key terms: SARS CoV-2, clinical aspects and pathology of SARS CoV-2, involvement of viral spike (S) protein in SARS CoV-2, immunological changes in COVID-19 infection, basic overview of CD28 immuno-molecule ligand, reduction of vaccine therapeutic efficacy in COVID-19 infection, and immunomodulatory response of lost CD28 ligand. SETTING: This study was done in a Maharishi Arvind College of Pharmacy, Jaipur, India. RESULTS: In COVID-19 patients, particularly those with severe disease, had increased levels of IL-2 or IL-2R. Given IL-2's supportive role in the expansion and differentiation of T cells, the authors exhibiting that lymphopenia, particularly in severe COVID-19, could be attributed to nonfunctional and dysfunctional differentiation of CD4+ and CD8+ T cells as a result of low CD28 immuno-molecule expression on naive T cells. CONCLUSIONS: The literature review found that independent, early immunological prognostic markers for a poor prognosis, in addition to higher levels of IL-6, include a substantial proportion of large inflammatory monocytes and a small proportion of chronic CD28+ CD4+T cells. The current findings suggest that a combination of COVID-19 vaccination with SARS CoV-2-reactive naive T cells with the CD28 immune-molecule may be a viable method for establishing T

Published
2022

47. Propagation of partially coherent beams in longitudinally modulated graded-index fibers

Author

Wadood, S. A., Liang, K., Agrawal, G. P., Visser, T. D., Stroud, C. R., Vamivakas, A. N., and Atoms, Molecules, Lasers

Abstract

We show that the cross-spectral density of Gaussian-Schell model beams undergoes amplification in parametrically modulated graded-index media. The process is an analog of quantum mechanical parametric amplification, and can find applications in fiber-based imaging.

Published
2021
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