Bücher von Surya Prakash

Research Paper (postgraduate) from the year 2018 in the subject Biology - Botany, grade: A, , course: Biotechnology, language: English, abstract: Gallic acid is showed best results from fermentation process than extraction process due to biotransformation. In this research, the highest concentration of gallic acid was observed to be 8.7 to 9.0 microgram/ml from the soxhlet extraction and column chromatography process, and the concentration was increased to 9.7 microgram/ml from the fermentation process by Bacillus cereus species. The fermented extracts are showed with the maximum specific growth rate and the maximum yield factor (Yx/s) of Bacillus cereus are 0.3541 hr-1 and 0.234 microgram/ml. The non fermented extracts are showed the modelling equation for the quercetin yield extract was Es = 0.0721(1 - e-0.2867t). The model allowed good accordance with the experimental data by producing average absolute relative deviation from about 9.78 percent.Keywords: Terminalia species, Gallic acid, Fermentation, Extraction, Bacillus cereus

This project investigates the performance 3-phase inverter fed to 0.5Hp induction motor (IM) drive system. Generation of SPWM technique using DSP (TMS320F2812). Generation of DSP-based patterns to control voltage source inverters substantially helped the development of modern electric drives used in various applications. A DSP based algorithm to generate sinusoidal PWM signals. The sinusoidal PWM generation algorithm is written in C language so it can be reused easily, in addition to the flexibility it provides in terms of changing the PWM switching frequency and the fundamental frequency of the inverter output voltage. The algorithm development methodology and the experimental results are presented. The V/f-constant (Voltage/Frequency equals to constants) control strategy of three phase AC motor was studied. SPWM (Sinusoidal Pulse Wave Modulation) algorithm was employed to design the open-loop speed control system of three phase AC motor and implement through programming on DSP (Digital Signal Processor) TMS320F2812. The purpose of precise speed control in the system is achieved in range of 30-50Hz.

This book presents the state-of-the-art techniques and recent research progress on Ear Biometrics. This book caters students, academics, researchers, practitioners who are interested in the field of Ear Biometrics and its applications in face recognition and security.