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1,102 results on '"Rao, V. S."'

2. Novel Power Smoothing Technique for a Hybrid AC-DC Microgrid Operating with Multiple Alternative Energy Sources

Author

NEMPU, P. B., SABHAHIT, J. N., GAONKAR, D. N., and RAO, V. S.

Subjects
kalman filters, microgrids, power smoothing, renewable energy sources, supercapacitors, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Computer engineering. Computer hardware, TK7885-7895
Abstract

The power produced by renewable sources such as photovoltaic systems and wind energy conversion systems is highly intermittent due to continuously changing irradiance and wind velocity. When the distributed generation systems employing photovoltaic (PV) array and wind energy conversion system (WECS) operate in grid-tied mode, the power fluctuations affect the power quality of the grid. In a hybrid AC-DC microgrid (HMG), the dynamics of DC and AC subgrids influence each other. This paper proposes a supercapacitor based novel power smoothing methodology for the HMG with PV array, WECS, fuel cell (FC) and electrolyzer (EL) based hydrogen storage system considering the power fluctuations in both subgrids. The power smoothing technique on the DC subgrid aims to facilitate instantaneous power balance. The Kalman filter (KF) based velocity smoothing (KFV) approach is developed for the WECS. The KFV technique is compared with the power smoothing techniques presented in the literature. The KFV method is found to be effective in computing the smooth power reference for the supercapacitor system. By incorporating the proposed power smoothing technique in the HMG, the stress on the interlinking converter (ILC) and utility grid are minimized and the power quality is enhanced.

Published
2021
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7. Notification of bread wheat variety MACS6145

Author

Rao, V. S., Misra, S. C., Bhagwat, M. D., Dixit, R. N., Honrao, B. K., Chavan, A. M., Surve, V. D., Khade, V. M., Menon, M. K., Brahma, R. N., Sivasamy, M., and Tomar, S. M. S.

Published
2007

9. Control of superluminal transit through a heterogeneous medium

Author

Kulkarni, M., Seshadri, N., Rao, V. S. C. Manga, and Gupta, S. Dutta

Subjects
Physics - Optics
Abstract

We consider pulse propagation through a two component composite medium (metal inclusions in a dielectric host) with or without cavity mirrors. We show that a very thin slab of such a medium, under conditions of localized plasmon resonance, can lead to significant superluminality with detectable levels of transmitted pulse. A cavity containing the heterogeneous medium is shown to lead to subluminal-to-superluminal transmission depending on the volume fraction of the metal inclusions. The predictions of phase time calculations are verified by explicit calculations of the transmitted pulse shapes. We also demonstrate the independence of the phase time on system width and the volume fraction under specific conditions., Comment: 21 Pages,5 Figures (Published in Journal of Modern Optics)

Published
2007
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10. Peptidoglycans

Author

Rao, V. S. Raghavendra, primary, Qasba, Pradman K., additional, Balaji, Petety V., additional, and Chandrasekaran, Rengaswami, additional

Published
2019
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19. Co-packaging of PMUT array with FOWLP ASIC's

Author

Giusti D., Quaglia F., Rahul D., Rao V. S., Savoia A., Shaw M., Wee D. H. S., Giusti, D., Quaglia, F., Rahul, D., Rao, V.S., Savoia, A., Shaw, M., Wee, D.H.S., Giusti, D., Quaglia, F., Rahul, D., Rao, V. S., Savoia, A., Shaw, M., and Wee, D. H. S.

Abstract

In medical ultrasound scanning applications PMUT (Piezo Micromachined Ultrasound transducers) need to be assembled along with the ASIC devices that drive the PMUT devices in transmission and receive the reflected ultrasound signal. To produce a sufficiently high resolution image, a large number of interconnections are required between the PMUT device and the companion ASICs (Application Specific Integrated Circuit) which is done using Cu pillar technology. This integration of Ultrasound Transducers using wafer level bonding between the traducer and the ASIC wafer has already been demonstrated [1]. This process suffers from the problem of yield if a non functioning transducer is bonded to a functioning ASIC or vice versa, and it also requires the ASIC die to be the same dimensions of the traducer die. In this article we will present a solution where known good ASIC die are assembled in a FOWLP (Fan Out wafer level Package) with known good PMUT device assembled using Cu pillar technology allowing for the optimisation of the ASIC for size/yield while still maintain the performance of the transducer required. Verification of the assembly flow has been done using a dummy die to ensure that the fully assembled FOWLP is practicable.

Published
2022

46. Amide linkage in novel three-ring bent-core molecular assemblies: polar mesophases and importance of H-bonding

Author

Doddamane S. Shankar Rao, Somen Debnath, Srikanth Turlapati, Nazma Begum, Rao V. S. Nandiraju, Golam Mohiuddin, and Sharmistha Ghosh

Subjects
Materials science, Hydrogen bond, Imine, Bent molecular geometry, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, Ring (chemistry), 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, Crystallography, chemistry, Liquid crystal, Amide, X-ray crystallography, Polar, General Materials Science, Physics::Chemical Physics, 0210 nano-technology
Abstract

Here, we report the first examples of achiral unsymmetrical three-ring bent-shaped liquid crystals comprising amide and imine linkages with transverse substituents of methyl and chloro moieties on the central phenyl ring in the core, exhibiting polar banana phases. The extensive intra and inter molecular H-bonding induced novel banana mesomorphic phases. One-dimensional stacking in the mesomorphic phase as well as ferroelectric polar order promoted by intermolecular H-bonding of amide linkage is demonstrated. The compounds exhibit multifunctional properties viz., the enantiotropic liquid crystalline (LC) phase at ambient temperatures, electro-optical response, spontaneous polarisation, emission characteristics with large Stokes shift, and even charge distribution with large voltage holding ratio (VHR) values. The smectic type phase was confirmed by XRD studies and polar order was established by switching current and dielectric investigations. DFT studies revealed the importance of their suitability for display applications.

Published
2018

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