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Sakthivel N. K.,Sutha S. 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.3
A successful zero-voltage switching scheme for a grid-tied single-stage flyback inverter, as well as the initiation of an Adaptive Fruit Fly Optimization (AFFO) algorithm based on PID Controller, has been put forward. To achieve soft switching, the grid side negative current follows the path of secondary bidirectional switches. As a result, the output capacitor of the MOSFET is discharged. To achieve Zero voltage, this function turns on the primary switch. As a result, optimising the reactive current level for zero voltage switching is critical. A PID Controller-based iteration of an Adaptive Fruit Fly Optimization (AFFO) algorithm is put forward. To provide soft switching, the grid side negative current follows the path of secondary bidirectional switches. As a result, the output capacitor of the MOSFET is discharged. This function activates the primary switch, causing it to turn on. At which the ZVS triggering takes place in the switches, with the adjustment of AFFO based PID controller’s parameters. An enhanced manner of PWM pulses is generated. The bidirectional switches in the primary and secondary sides of the flyback inverter are fed with pulses, thereby the switching losses are reduced by eliminating harmonics. The proposed work is designed with MATLAB/Simulink. A 24 V, 325-W prototype is performed to authenticate the proposed model.
K. Pandima Devi,R. Sakthivel,S. Arif Nisha,N. Suganthy,S. Karutha Pandian 대한약학회 2013 Archives of Pharmacal Research Vol.36 No.3
Eugenol, a member of the phenylpropanoidsclass of chemical compounds, is a clear to pale yellow oilyliquid extracted from certain essential oils especially fromclove oil, nutmeg, cinnamon, and bay leaf. The antibacterialactivity of eugenol and its mechanism of bactericidalaction against Proteus mirabilis were evaluated. Treatmentwith eugenol at their minimum inhibitory concentration[0.125 % (v/v)] and minimum bactericidal concentration[0.25 % (v/v)] reduced the viability and resulted in completeinhibition of P. mirabilis. A strong bactericidal effecton P. mirabilis was also evident, as eugenol inactivated thebacterial population within 30 min exposure. Chemoattractantproperty and the observance of highest antibacterialactivity at alkaline pH suggest that eugenol can workmore effectively when given in vivo. Eugenol inhibits thevirulence factors produced by P. mirabilis as observed byswimming motility, swarming behavior and urease activity. It interacts with cellular membrane of P. mirabilis andmakes it highly permeable, forming nonspecific pores onplasma membrane, which in turn directs the release of260 nm absorbing materials and uptake of more crystalviolet from the medium into the cells. SDS–polyacrylamidegel, scanning electron microscopy and Fourier transforminfrared analysis further proves the disruptive action ofeugenol on the plasma membrane of P. mirabilis. Thefindings reveal that eugenol shows an excellent bactericidalactivity against P. mirabilis by altering the integrity of cellmembrane.
Inverse problems for the phase field system with one observation
Baranibalan, N.,Sakthivel, K.,Balachandran, K.,Kim, J. -H. Taylor Francis 2009 Applicable analysis Vol.88 No.4
<P> First we establish a Carleman estimate with a single observation acting on a subdomain for the phase field system in a bounded domain [image omitted] Then this estimate is successfully used along with certain energy estimates to obtain the stability result for the inverse problem consisting of retrieving a smooth diffusion coefficient in the given system for the dimension [image omitted]</P>
( M. Gandhi Pragash ),( K. Badri Narayanan ),( P. Ravindra Naik ),( N. Sakthivel ) 한국미생물 · 생명공학회 2009 Journal of microbiology and biotechnology Vol.19 No.1
Strain PUPC1 produces an antifungal protease as well as plant growth promoting enzymes such as 1-aminocyclopropane-1-carboxylate (ACC) deaminase and phosphatase. Morphological, cultural, and physiological characteristics as well as 16S rRNA gene-sequence-based phylogenetic analysis confirmed the taxonomic affiliation of PUPC1 as Chryseobacterium aquaticum. The optimum growth of PUPC1 was observed at pH 6.0 and 30℃, and maximum protease production was observed in medium B amended with 1% tryptone, 0.5% sucrose, and 0.005% MnCl2. The protease was purified by ammonium sulfate precipitation, Sephadex G-75 gel filtration chromatography, and electroelution from preparative SDS-PAGE. The protease had a molecular mass of 18.5 kDa. The optimum pH and temperature stability of the protease were pH 5.0-10.0 and temperature 40-70℃. Chryseobacterium aquaticum PUPC1 and its protease showed a broad-spectrum antifungal activity against phytopathogenic fungi. Strain PUPC1 also exhibited plant growth promoting traits. The objective of the present investigation was to isolate a strain for agricultural application for plant growth promotion and biocontrol of fungal diseases.