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8,263 results on '"Srinivasan, R."'

14. Sheet model description of spatio-temporal evolution of upper-hybrid oscillations in an inhomogeneous magnetic field

Author

Rathee, Nidhi, Dutta, Someswar, Srinivasan, R., and Sengupta, Sudip

Subjects
Physics - Plasma Physics
Abstract

Spatio-temporal evolution of large amplitude upper hybrid oscillations in a cold homogeneous plasma in the presence of an inhomogeneous magnetic field is studied analytically and numerically using the Dawson sheet model. It is observed that the inhomogeneity in magnetic field which causes the upper hybrid frequency to acquire a spatial dependence, results in phase mixing and subsequent breaking of the upper hybrid oscillations at arbitrarily low amplitudes. This result is in sharp contrast to the usual upper hybrid oscillations in a homogeneous magnetic field where the oscillations break within a fraction of a period when the amplitude exceeds a certain critical value. Our perturbative calculations show that the phase mixing (wave breaking) time scales inversely with the amplitude of magnetic field inhomogeneity ($\Delta$) and amplitude of imposed density perturbation ($\delta$), and scales directly with the ratio of magnetic field inhomogeneity scale length to imposed density perturbation scale length ($(\alpha/k_L)^{-1}$ ) as $\omega_{pe}\tau_{mix} \sim \left( 1+\beta^2 \right) ^{3/2}k_L/(\beta^2\delta\Delta\alpha)$, where $\beta$ is the ratio of electron cyclotron frequency to electron plasma frequency. Further phase mixing time measured in simulations, performed using a 1-1/2 D code based on Dawson sheet model, shows good agreement with the above mentioned scaling. This result may be of relevance to plasma based particle acceleration experiments in the presence of a transverse inhomogeneous magnetic field.

Published
2024

18. Absolute Flux Density Calibration of the Greenland Telescope Data for Event Horizon Telescope Observations

Author

Koay, J. Y., Asada, K., Matsushita, S., Kuo, C. -Y., Huang, C. -W. L., Romero-Cañizales, C., Koyama, S., Park, J., Lo, W. -P., Bower, G., Chen, M. -T., Chang, S. -H., Chen, C. -C., Chilson, R., Han, C. C., Ho, P. T. P., Huang, Y. -D., Inoue, M., Jeter, B., Jiang, H., Koch, P. M., Kubo, D., Li, C. -T., Liu, C. -T., Liu, K. -Y., Martin-Cocher, P., Nakamura, M., Norton, T. J., Nystrom, G., Oshiro, P., Patel, N., Pen, U. -L., Pu, H. -Y, Raffin, P. A., Rao, R., Sridharan, T. K., Srinivasan, R., and Wei, T. -S

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

Starting from the observing campaign in April 2018, the Greenland Telescope (GLT) has been added as a new station of the Event Horizon Telescope (EHT) array. Visibilities on baselines to the GLT, particularly in the North-South direction, potentially provide valuable new constraints for the modeling and imaging of sources such as M87*. The GLT's location at high Northern latitudes adds unique challenges to its calibration strategies. Additionally, the performance of the GLT was not optimal during the 2018 observations due to it being only partially commissioned at the time. This document describes the steps taken to estimate the various parameters (and their uncertainties) required for the absolute flux calibration of the GLT data as part of the EHT. In particular, we consider the non-optimized status of the GLT in 2018, as well as its improved performance during the 2021 EHT campaign., Comment: 17 pages, 4 figures, EHT Memo Series 2023-L1-02

Published
2023

33. Facial Emotion Recognition of Mentally Retarded Children to Aid Psychotherapist

Author

Srinivasan, R., Swathika, R., Radha, N., Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Senjyu, Tomonobu, editor, So–In, Chakchai, editor, and Joshi, Amit, editor

Published
2024
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34. Exploring the Role of Entropy in Music Classification

Author

Ronnie, J. Bryan, Sharma, V. Harish, Angappan, R. Aravind, Srinivasan, R., Filipe, Joaquim, Editorial Board Member, Ghosh, Ashish, Editorial Board Member, Prates, Raquel Oliveira, Editorial Board Member, Zhou, Lizhu, Editorial Board Member, Chakravarthi, Bharathi Raja, editor, B, Bharathi, editor, García Cumbreras, Miguel Ángel, editor, Jiménez Zafra, Salud María, editor, Subramanian, Malliga, editor, Shanmugavadivel, Kogilavani, editor, and Nakov, Preslav, editor

Published
2024
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42. [Untitled]

Author

Hameed, M. A. Mohamed Sahul, Srinivasan, R., and Jacob, Rosamma

Published
2012

46. Spatial crop planning for sustainable resource use and conservation of ecological resources—a case study from Vattavada, Munnar

Author

Dharumarajan, S., primary, Vasundhara, R., additional, Kalaiselvi, B., additional, Lalitha, M., additional, Rameshan, M., additional, Srinivasan, R., additional, Karthika, K.S., additional, Maddileti, N., additional, Kumari, Sweta, additional, Suputhra, Amar, additional, Pradeep, C.M., additional, and Hegde, Rajendra, additional

Published
2024
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