Search Results - "Narayanan, V. Lakshmi"

Airglow observations of nighttime medium-scale traveling ionospheric disturbances from Yonaguni: Statistical characteristics and low-latitude limit by Lakshmi Narayanan, V., Shiokawa, K., Otsuka, Y., Saito, S.

“…The characteristics of nighttime medium‐scale traveling ionospheric disturbance (MSTID) features observed over Yonaguni (24.5°N, 123.0°E; 19.3°N dip latitude),…”
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Study of wave signatures observed in thermospheric airglow imaging over the dip equatorial region by Sau, Sukanta, Lakshmi Narayanan, V., Gurubaran, S., Emperumal, K.

“…The observational data on OI 630 nm thermospheric nightglow from the Indian dip equatorial station, Tirunelveli (8.7°N, 77.8°E geographic, 1.6°N dip latitude)…”
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On the importance of wave-like structures in the occurrence of equatorial plasma bubbles: A case study by Narayanan, V. Lakshmi, Taori, A., Patra, A. K., Emperumal, K., Gurubaran, S.

“…Coordinated observations of equatorial plasma bubbles (EPBs) have been made with an all‐sky airglow imager, narrow bandwidth photometer, VHF radar, and…”
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Statistical characteristics of high frequency gravity waves observed by OH airglow imaging from Tirunelveli (8.7°N) by Lakshmi Narayanan, V., Gurubaran, S.

“…The importance of high frequency gravity waves in the upper mesospheric region is now well recognized. In this study, we examine the characteristics of high…”
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Airglow imaging observations of small-scale structures driven by convective instability in the upper mesosphere over Tirunelveli (8.7°N) by Lakshmi Narayanan, V., Gurubaran, S., Emperumal, K.

“…Airglow imaging observations of broadband OH Meinel band emissions made on the night of 20 January 2007 from the tropical Indian site Tirunelveli (8.7°N,…”
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A case study of a mesospheric bore event observed with an all‐sky airglow imager at Tirunelveli (8.7°N) by Narayanan, V. Lakshmi, Gurubaran, S., Emperumal, K.

“…A prominent front separating bright and dark regions of all‐sky airglow images was recorded on the night of 22/23 March 2007, at the low‐latitude Indian…”
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A study on the night time equatorward movement of ionization anomaly using thermospheric airglow imaging technique by Lakshmi Narayanan, V., Gurubaran, S., Emperumal, K., Patil, P.T.

“…In the night time low latitude ionosphere, the equatorial ionization anomaly (EIA) crest move towards the equator as a result of change in the direction of the…”
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Nightglow imaging of different types of events, including a mesospheric bore observed on the night of February 15, 2007 from Tirunelveli (8.7°N) by Lakshmi Narayanan, V., Gurubaran, S., Emperumal, K.

“…All-sky imaging observations on the night of February 15, 2007, from Tirunelveli (8.7°N), revealed a variety of short-period small-scale dynamical features…”
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Unusual optical observations of OI greenline during a geospace event on 1 February 2008 by Narayanan, V. Lakshmi, Gurubaran, S., Emperumal, K., Patil, P. T.

“…We herein report the first observations of an unusual phenomenon recorded by an all‐sky airglow imager from the low‐latitude site Panhala (16.8°N, 74.1°E,…”
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Improved machine learning-based pitch controller for rated power generation in large-scale wind turbine by Lakshmi Narayanan, V., Kumar Dhaked, Dheeraj, Sitharthan, R.

“…•Improved recurrent RBFNN is designed for rated power generation.•The parameters of the improved recurrent RBFNN are optimized by modified PSO.•The proposed…”
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The study of equatorial plasma bubble during January to April 2012 over Kolhapur (India) by Parashram T. Patil, Rupesh N. Ghodpage, Alok K. Taori, Rohit P. Patil, Subramanian Gurubaran, Suraj N. Nikte, Dada P. Nade, Ashok K. Sharma, Sridhar Banola, V. Lakshmi Narayanan, Devendraa Siingh

“…Over 53 nights of all sky airglow imager data collected during January-April 2012 from the low latitude station Kolhapur (16.68°N, 74.26°E; 10.6°N dip…”
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Design and implementation of an intelligent digital pitch controller for digital hydraulic pitch system hardware-in-the-loop simulator of wind turbine by Narayanan, V. Lakshmi, Ramakrishnan, R.

“…Digital hydraulics is a potential technology for the Hydraulic Pitch System (HPS) in Wind Turbine (WT). Digital Hydraulics Pitch System (DHPS) uses Digital…”
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Model-based design optimisation of digital hydraulic pitch actuator for a large-scale wind turbine by Lakshmi Narayanan, V., Ramakrishnan, R.

“…The valve throttle regulation issue in the proportional flow control valves reduces the performance of the hydraulic pitch system in large-scale wind turbines…”
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All-optical clock recovery from advanced modulation formats through injection-locking of fiber laser by Srivastava, Manas, V., Lakshmi Narayanan, Srinivasan, Balaji, Venkitesh, Deepa

“…The use of advanced modulation formats in optical communication imposes stringent requirements on optical signal to noise ratio (OSNR) and thus, 3R…”
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Demonstration of all-optical clock recovery from NRZ-PM-QPSK and PM-16QAM signals by Srivastava, Manas, Lakshmi Narayanan, V, Srinivasan, Balaji, Venkitesh, Deepa

“…We demonstrate all-optical clock recovery from optical NRZ-PM-QPSK and NRZ-PM-16QAM data at 10 Gbaud after 60 km fiber propagation, through injection-locking…”
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Polarization Insensitive Phase Conjugation Using Single-Pump Four Wave Mixing in SOA by Sobhanan, Aneesh, Lakshmi Narayanan, V, Koilpillai, David, Venkitesh, Deepa

“…We experimentally demonstrate the generation of polarization insensitive phase conjugate of PM-QPSK signal in both input and output ports of SOA using…”
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Influence of Polarization Transformation in Phase Conjugation of PM-QPSK in Nonlinear SOAs by Sobhanan, Aneesh, Lakshmi Narayanan, V, Koilpillai, R David, Venkitesh, Deepa

“…Polarization insensitive phase conjugation generation is experimentally demonstrated using a single pump in a nonlinear SOA for 10 GBaud PM-QPSK data. The…”
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Experimental Analysis of Noise Transfer in Optical Phase Conjugation Process in Nonlinear SOA by Sobhanan, Aneesh, Vijay, A. M. Karthik, Narayanan, V. Lakshmi, Koilpillai, R. David, Venkitesh, Deepa

“…We experimentally evaluate the noise transfer properties during the phase conjugation process in nonlinear SOA by varying the OSNR of the input signal. OSNR…”
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Nightglow imaging of different types of events, including a mesospheric bore observed on the night of February 15, 2007 from Tirunelveli (8.7°N): Structure and Dynamics of Mesosphere and Lower Thermosphere Region by LAKSHMI NARAYANAN, V, GURUBARAN, S, EMPERUMAL, K

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Unusual optical observations of OI greenline during a geospace event on 1 February 2008: MYSTERIOUS STREAKS IN OI 557.7 NM AIRGLOW by Narayanan, V. Lakshmi, Gurubaran, S., Emperumal, K., Patil, P. T.

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