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Articles by V. Kannan
Total Records ( 3 ) for V. Kannan
  V. Kannan , P.E. Sankarnarayanan and S.K. Srivatsa
  Simulation of the DC characteristics of depletion mode AlGaAs/GaAs Modulation Doped Field Effect Transistor (MODFET) under backside optical illumination is presented. A device structure with fiber inserted into the substrate up to the GaAs layer is considered for direct illumination into the GaAs layer. The AlGaAs layer is considered transparent to illumination. The photoconductive effect which increases the two dimentional electron gas (2DEG) channel electron concentration alone is considered. These electrons generated in the GaAs layer is collected in 2DEG, which increases the source to drain current. The photo generated holes in GaAs layer drifts towards the semi-insulating substrate and is capacitively coupled into the grounded source. The I-V characteristics of MODFET under dark and illuminated conditions have been simulated and discussed.
  V. Kannan , P.E. Sankarnarayanan and S.K. Srivatsa
  The time dependent characteristics of n-A1GaAs/GaAs Modulation Doped Field Effect Transistors (MODFET) under backside optical illumination is investigated and the transient behaviour of the device have been simulated. A device structure with fiber inserted into the substrate up to GaAs layer is considered for direct illumination into the GaAs layer. Partial depletion of the active region is considered. The excess carriers due to photo generation are obtained by solving the time dependent continuity equation. The energy levels are modified due to generation of carriers. The offset voltage, sheet concentration and time dependent I-V characteristics have been simulated and discussed. The time dependent I-V characteristics is compared with available theoretical data at a particular gate source voltage under illuminated condition.
  N.K. Udaya Prakash , S. Bhuvaneswari , B. Jahnavi , K. Abhinaya , A. Gulbsy Rajalin , M. Prathap Kumar , G. Sundraraman , K. Elumalai , S. Devipriya , V. Kannan , V. Sriraman and G. Kathiravan
  The present study reports the antibacterial potency of the methanolic extract of 25 common weeds, Abutilon indicum, Acalypha indica, Ageratum conyzoides, Alangium platanifolium, Anisomeles sp., Boerhavia diffusa, Cardiospermum helicacabum Cassia alata, Centella asiatica, Coccinia grandis, Commelina benghalensis, Corchorus sp., Croton sparsiflorus, Dodonea viscosa, Hyptis sauveolens, Lantana camara, Leonotis nepetifolia, Mimosa pudica, Martinea annua, Occimum americanum, Oldenlandia umbellata, Parthenium hysterophorus, Solanum nigrum, Tinospora cordifolia and Xanthium stromarium belonging to 15 different families. The plants were collected from the districts of Chengalpet, Chennai, Kancheepuram, Vellore and Tiruvellore belonging to the Northern part of the State of Tamil Nadu. The antibacterial property were determined using disc diffusion method on the following species of bacteria, i.e., Bacillus subtilis (MTCC121), Escherichia coli (MTCC443), Staphylococcus aureus (MTCC96), Streptococcus mutans (MTCC890) and Klebsiella pneumoniae (MTCC1320). The following weeds, Parthenium hysterophorus, Leonotis nepetifolia, Martinea annua and Xanthium stromarium have showed positive zone of inhibition to all the bacteria studied.
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