National Institute of Technology Calicut

About: National Institute of Technology Calicut is a education organization based out in Kozhikode, Kerala, India. It is known for research contribution in the topics: Computer science & Control theory. The organization has 3627 authors who have published 4638 publications receiving 50830 citations. The organization is also known as: Calicut Regional Engineering College & NIT Calicut.

A study on the impact of climate change on streamflow at the watershed scale in the humid tropics

Abstract: Climate change is recognized to be one of the most serious challenges facing mankind today. Driven by anthropogenic activities, it is known to be a direct threat to our food and water supplies and ...

Optimal fractional order PID controller for automatic generation control of two-area power systems

Abstract: SUMMARY This paper proposes a fractional order PID (FOPID) controller for the supplementary automatic generation control (AGC) of two area thermal power systems. To establish the effectiveness of the proposed controller, its dynamic performance is compared with integral/PI controllers. The parameters of the PI controllers are determined using genetic algorithm (GA) and fuzzy logic-based approaches. These comparisons are performed in terms of two time domain performance indices viz., settling time and maximum overshoot/undershoot of the dynamic response and three error indices, viz., Integral of Time multiplied Absolute Error (ITAE), Integral of the Absolute Error (IAE) and Integral of the square error (ISE). Copyright © 2014 John Wiley & Sons, Ltd.

Quantitative Feedback Design-Based Robust PID Control of Voltage Mode Controlled DC-DC Boost Converter

Abstract: This brief addresses the problem of instability occurring in the voltage control mode of a non-minimum phase (NMP) DC-DC boost converter. To solve this instability issue in the presence of uncertainties and the external disturbances, quantitative feedback theory (QFT) is adapted to systematically design a robust proportional integral derivative (PID) controller, which is realized using only sensed output voltage as feedback. The advantages of the proposed PID design using the QFT are: (i) it eliminates the burden of tedious and ad-hoc tuning of PID gains using the conventional PID design approaches, (ii) current measurement is not required, (iii) disturbance dynamics (input voltage and load current variations) are included in the design stage itself, which further enhances the disturbance rejection performance of the output voltage, and (iv) it allows direct design for the non-minimum phase boost converter despite the bandwidth limitations. Extensive simulations and experiments are carried out to validate the efficacy of the proposed PID controller in the presence of the external disturbances and compared its superiority over a conventional PID controller.

PVA/PDADMAC/ZSM-5 zeolite hybrid matrix membranes for dye adsorption: Fabrication, characterization, adsorption, kinetics and antimicrobial properties

Abstract: Novel poly vinyl alcohol/poly (diallyldimethylammonium chloride)/ZSM-5 zeolite (PVA/PDADMAC/ZSM-5) membranes have been prepared by solvent casting route. They were characterized by techniques such as X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (SEM), thermogravimetric analysis (TGA) and optical microscopy (OM). XRD analysis indicated an enhanced crystallinity for the PVA/PDADMAC matrix after zeolite incorporation. SEM and optical microscopic results confirmed that the zeolite particles were well distributed throughout the matrix. The membranes exhibited good thermal and mechanical stability as confirmed by TGA and universal testing machine (UTM) examinations. The membranes were applied as adsorbents for the removal of methyl orange (MO) dye from aqueous solutions. The effects of parameters such as zeolite content, contact time, initial concentration of dye, pH and temperature on the adsorption capacity was evaluated. It has been found that the membrane with 5 wt% zeolite loading exhibits a high MO removal efficiency (95%). Non-linear and linear forms of pseudo-first-order and pseudo-second-order models were used to study the adsorption kinetics. The results indicate that the adsorption of MO on the membrane follows pseudo-second-order kinetics. The equilibrium data was modelled by Freundlich and Langmuir isotherm in their linear and non-linear forms. A relatively higher R2 value for the Freundlich isotherm indicate that this model could fit the experimental data better than the Langmuir model. The recycling studies revealed that the adsorption efficiency of the membrane was unaltered even after four adsorption-desorption cycles.