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Jayabal Rajasekar,김태호,김희동 한국가시화정보학회 2022 한국가시화정보학회지 Vol.20 No.3
The interaction of planar shock wave with rectangular water column is investigated numerically. The flow phenomenon like reflection, transmission, cavitation, recirculation of shock wave, and large negative pressure due to expansion waves was discussed qualitatively and quantitatively. The numerical simulation was performed in a shock tube with a water column, and planar shock was initiated with a pressure ratio of 10. Three cases of the water column with different thicknesses, namely 0.5D, 1D, and 2D, were installed and studied. Water naturally has a higher acoustic impedance than air and mitigates the shock wave considerably. The numerical simulations were modelled using Eulerian and Volume of fluids multiphase models. The Eulerian model assumes the water as a finite structure and can visualize the shockwave propagation inside the water column. Through the volume of fluids model, the stages of breakup of the water column and mitigation effects of water were addressed. The numerical model was validated against the experimental results. The computational results show that the installation of a water column significantly impacts the mitigation of shock wave.
Jayabal, Revathi,Rasangam, Latha,Mani, Manokari,Shekhawat, Mahipal Singh Institute of Forest Science 2019 Journal of Forest Science Vol.35 No.1
Plant tissue culture techniques offer quick methods of regeneration of plants of medicinal importance but the survival chances of such plants are always questionable when shifted to the in vivo conditions. The present study enumerates the micromorphological developments in the leaves of in vitro regenerated and field transferred plantlets of Oldenlandia umbellata. The leaves developed in vitro after $4^{th}$ subcultures of multiplication phase and after 6 weeks of field transferred plants were used. Statistically significant differences in the number of stomata, veins, raphides, crystals and trichome density per square mm were observed. The improvements in stomatal apparatus and density (decreased from 41.85 to 32.20), developments in leaf architectural parameters and emergence of defense mechanism through increased numbers of raphides (8 to 15), crystals and trichomes (13.5 to 18.2) proved acclimation of tissue culture raised plantlets from in vitro to the in vivo environments lead to 100 % success in field establishment of the plantlets. The in vitro induced foliar abnormalities (changes in stomata, venation pattern, vein density, trichomes, crystals etc.) were repaired while hardening of plantlets in the greenhouse and finally in the field. The observed micromorphological response of leaves under altered environmental conditions could help in determination of proper stage of field transfer and prediction of survival percentage of in vitro regenerated O. umbellata plantlets.
Revathi Jayabal,Latha Rasangam,Manokari Mani,Mahipal Singh Shekhawat 강원대학교 산림과학연구소 2019 Journal of Forest Science Vol.35 No.1
Plant tissue culture techniques offer quick methods of regeneration of plants of medicinal importance but the survival chances of such plants are always questionable when shifted to the in vivo conditions. The present study enumerates the micromorphological developments in the leaves of in vitro regenerated and field transferred plantlets of Oldenlandia umbellata. The leaves developed in vitro after 4th subcultures of multiplication phase and after 6 weeks of field transferred plants were used. Statistically significant differences in the number of stomata, veins, raphides, crystals and trichome density per square mm were observed. The improvements in stomatal apparatus and density (decreased from 41.85 to 32.20), developments in leaf architectural parameters and emergence of defense mechanism through increased numbers of raphides (8 to 15), crystals and trichomes (13.5 to 18.2) proved acclimation of tissue culture raised plantlets from in vitro to the in vivo environments lead to 100 % success in field establishment of the plantlets. The in vitro induced foliar abnormalities (changes in stomata, venation pattern, vein density, trichomes, crystals etc.) were repaired while hardening of plantlets in the greenhouse and finally in the field. The observed micromorphological response of leaves under altered environmental conditions could help in determination of proper stage of field transfer and prediction of survival percentage of in vitro regenerated O. umbellata plantlets.
Improvement in Electrical Performance of Distributed Generation due to Electromagnetic Interference
Divya Solaisamy,Devi Shree Jayabal,Mynavathi Mani 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.6
Utilization of renewable energy resources comprises problems like lack of access to land and intermittent nature of renewable sources. In the proposed work, the effect of high voltage (HV) lines on electrical characteristics and conversion process of photovoltaic (PV) panels is analyzed. the electromagnetic field (EMF) from HV lines has positive impact on solar cells. Energy of non-ionizing radiation from HV line is not sufficient to generate free electron from the atom but it vibrates the atom producing vibrating energy (phonon). When photon energy from sun is low, this vibrating energy aids photon energy in the generation of free electron. This concept is employed in a novel way to increase conversion efficiency of silicon (Si) solar PV cell. The impact of electromagnetic fields produced by HV lines on solar cells is validated with theoretical and experimentally tested results under 110 kV and 230 kV HV lines. Persistent effect of EMF on solar panels is measured and recorded through cloud computing technology.