National Institute of Technology, Karnataka

About: National Institute of Technology, Karnataka is a education organization based out in Mangalore, Karnataka, India. It is known for research contribution in the topics: Computer science & Corrosion. The organization has 5017 authors who have published 7057 publications receiving 70367 citations.

Ag-TiO2 nanosheet embedded photocatalytic membrane for solar water treatment

Abstract: Solar photocatalytic degradation of contaminants in waste water using nanocatalysts is potentially sustainable water treatment. The major challenges in using nano size photocatalysts is catalyst recovery and its toxic effect. In the present work, the problem of catalyst recovery is mitigated by immobilising the photocatalyst on the surface of a membrane by pressurized ultrafiltration method. The membrane thus synthesised is capable of simultaneously degrading and filtering the pollutants. The photocatalyst employed in this work is silver doped TiO 2 nanosheets, their thin structure and larger size favoured stable film formation on the membrane surface. The nanosheets were synthesised via hydrothermal route and their photocatalytic efficiency was future enhanced by doping with silver. The nanosheets were characterised using scanning electron microscopy, X-ray diffraction and energy dispersive X-ray spectroscopy. Photocatalytic degradation studies were conducted using Congo red dye as the model pollutant. The effect of catalyst loading on permeation properties and dye removal were studied under ultra violet irradiation. M-200 membrane with Ag-TNS loading of 136.98 gm −2 was found optimum for superior flux and dye removal. M-200 membrane also showed good performance under solar radiation.

Comparative study of fracture toughness of austempered ductile irons with upper and lower ausferrite microstructures

Abstract: A ductile iron was austempered at 302 and 385°C for various times to get lower and upper ausferrite microstructures respectively. The microstructures were characterised hy y optical microscopy and X-ra y diffraction. Plane strain fracture toughness was determined under all heat treatment conditions. While the austempered ductile iron with lower ausferrite microstructure showed higher fracture toughness, the one with upper ausferrite microstructure exhibited higher tensile toughness and strain hardening coefficient. A model was developed relating fracture toughness to the yield strength (σ y ) volume fraction of retained austenite (X y ) and the carbon content of the retained austenite (C y ). Experimental results showed excellent agreement with the prediction of the model that K 2 1C is proportional to σ y (X γ C γ ) 1/2 .

Currency recognition system using image processing

Abstract: In this paper, we propose a system for automated currency recognition using image processing techniques The proposed method can be used for recognizing both the country or origin as well as the denomination or value of a given banknote Only paper currencies have been considered This method works by first identifying the country of origin using certain predefined areas of interest, and then extracting the denomination value using characteristics such as size, color, or text on the note, depending on how much the notes within the same country differ We have considered 20 of the most traded currencies, as well as their denominations Our system is able to accurately and quickly identify test notes