Real time hardware implementation of discrete sliding mode fuzzy controlled buck converter using digital signal processor

This paper deals with the real time hardware implementation of discrete sliding mode fuzzy control (DSMFC) for buck converter using digital signal processor (DSP). Applications like electric vehicle suspension control, flight dynamic control, robot position control and engine throttle position control; sliding mode control (SMC) plays a major role. Hardware realization is difficult with SMC strategy due to the continuous gain change results in chattering problem and actuator or contact may break. To resolve this problem the fuzzy logic (FL) approach has combined with the robust technique discrete sliding mode control (DSMC) to develop a new strategy for DSMFC. The mathematical modeling of the controller is done using MATLAB/Simulink software and practical design of the converter is also realized. The robustness of the controller is proved by introducing sudden change in input voltage as well as load with the help of switching circuit in hardware realization. The obtained practical results are verified by comparing with the simulation output and reference value

Hatchery seed production and nursery rearing of Indian pearl oyster Pinctadafucata (Gould) under onshore and offshore conditions at Mandapam, Tamil Nadu

A full fledged pearl oyster hatchery was established at R.C. of CMFRI, Mandapam Camp along with a temperature controlled micro algal culture laboratory. The hatchery house four 5 ton capacity circular FRP tanks for storage of filtered sea water and 28 nos of 1.5 ton rectangular FRP tanks for larval rearing. A central drain of 80 m length connects the hatchery to the sea. Sea water supply is effected through 7.5 and 10 HP pumps connected to sedimentation tanks, ground level sumps and to overhead tank. Two sand filters were erected for effective filtering of sea water. Aeration is provided with air blowers and air compressors. The annual production capacity is estimated to be 2.8 million spats. Induced spawning and larval rearing gave encouraging results and 0.7 million spats were produced during June-August 1997

Results of the mother oyster culture and pearl production in Pinctada fucata (Gould) in the inshore waters of the Gulf of Mannar and Palk Bay

It is established experimentally that the inshore areas of the Gulf of Mannar and Palk Bay bordering Mandapam Camp can profitably be used for mother oyster culture and cultured pearl production. The depth of the inshore waters of the Gulf of Mannar is comparatively deeper where the raft culture can be adopted from November to May. whereas, the nearshore waters of Palk Bay is shallow where rack can be used to farm the oysters from June to October, thus a continued farming is possible in all months in a calender year. Though the hydrological and environmental conditions of both the seas are almost same, it is found that Gulf of Mannar is better suited for mother oyster culture as indicated by the better growth rates of spat and oysters. If farming is done properly, high survival rates of spat, mother oysters and implanted oysters can be achieved with an enhanced rate of production of better quality cultured pearls

Green Synthesised Silver Nanoparticles Using <i>Anoectochilus elatus</i> Leaf Extract: Characterisation and Evaluation of Antioxidant, Anti-Inflammatory, Antidiabetic, and Antimicrobial Activities

The present study investigates the green synthesis of silver nanoparticles was carried out using a leaf extract of Anoectochilus elatus (Ae-AgNPs). The synthesised Ae-AgNPs were characterised using different analytical techniques like UV-visible spectroscopy, X-ray diffraction (XRD), Fourier transform infrared (FTIR), and scanning electron microscopy (SEM) with energy-dispersive X-ray analysis (EDX). Additionally, in vitro activities were investigated, and they possess antioxidant, anti-inflammatory, antidiabetic, and antimicrobial properties. The UV-Vis spectra exhibited characteristic absorption peaks at approximately 480 nm. FTIR identified functional groups of the Ae-AgNPs. The crystalline structure of the Ae-AgNPs was verified via XRD analysis. SEM studies revealed that the nanoparticles exhibited a spherical morphology. The fabrication of Ae-AgNPs was established by the EDX spectrum, which exhibited prominent signals of silver atoms. The Ae-AgNPs show potent antioxidant, anti-inflammatory, and antidiabetic activity compared to standard drugs. In addition, Ae-AgNPs demonstrated the most significant zone of Inhibition. This study affirms the superior biological capability of Ae-AgNPs for target drug delivery and their potential for usage in biomedical research and therapeutics