National Institute of Technology, Silchar

About: National Institute of Technology, Silchar is a education organization based out in Silchar, Assam, India. It is known for research contribution in the topics: Computer science & Control theory. The organization has 1934 authors who have published 4219 publications receiving 41149 citations. The organization is also known as: NIT Silchar.

Edge SLAM: Edge Points Based Monocular Visual SLAM

Abstract: Visual SLAM shows significant progress in recent years due to high attention from vision community but still, challenges remain for low-textured environments. Feature based visual SLAMs do not produce reliable camera and structure estimates due to insufficient features in a low-textured environment. Moreover, existing visual SLAMs produce partial reconstruction when the number of 3D-2D correspondences is insufficient for incremental camera estimation using bundle adjustment. This paper presents Edge SLAM, a feature based monocular visual SLAM which mitigates the above mentioned problems. Our proposed Edge SLAM pipeline detects edge points from images and tracks those using optical flow for point correspondence. We further refine these point correspondences using geometrical relationship among three views. Owing to our edge-point tracking, we use a robust method for two-view initialization for bundle adjustment. Our proposed SLAM also identifies the potential situations where estimating a new camera into the existing reconstruction is becoming unreliable and we adopt a novel method to estimate the new camera reliably using a local optimization technique. We present an extensive evaluation of our proposed SLAM pipeline with most popular open datasets and compare with the state-of-the art. Experimental result indicates that our Edge SLAM is robust and works reliably well for both textured and less-textured environment in comparison to existing state-of-the-art SLAMs.

Ethylene glycol mediated synthesis of Ag8SnS6 nanoparticles and their exploitation in the degradation of eosin yellow and brilliant green

Abstract: Ag8SnS6 (silver tin sulfide) nanoparticles (17–18 nm) were synthesized using a chemical coprecipitation method using ethylene glycol as a solvent and capping agent and thiourea as a sulfur source at a temperature of 160 °C, 6 h. The as synthesized nanoparticles were characterized by X-ray diffraction (XRD), and transmission electron microscopy (TEM). The optical properties were investigated by using UV-visible NIR spectroscopy. The XRD pattern shows the formation of single phase Ag8SnS6 with a rhombohedral structure. Ethylene glycol mediated synthesis resulted in the formation of spherical Ag8SnS6 nanoparticles as seen from TEM images. Diffuse reflectance spectra show that Ag8SnS6 possesses an absorption profile across the whole visible-light and near-infrared region. Ag8SnS6 exhibits a band gap energy 1.12 eV. Ag8SnS6 shows powerful visible light photodegradation activity towards the degradation of eosin yellow and brilliant green dyes. The enhanced photocatalytic activity of Ag8SnS6 particles is attributed to its improved visible light absorption and efficient separation of photogenerated charge carriers. Studies with different quenchers suggest that superoxide radicals play a major role in the photodegradation process.

Influence of surface morphology on photocatalytic performance of zinc oxide: A review

Abstract: Effective solar energy harvested through material engineering is a promising technique for both environment and energy applications. Current researches show the role of metal oxide photocatalyst for efficient solar energy harvesting. Among various techniques for improving the photocatalytic performance, structural engineering is one of the effective methods to enhance the surface area and photon absorption of the metal oxide along with effective charge carrier separation. Keeping this in mind, a detailed review on various nanostructures of ZnO as photocatalyst has been carried out to explore the role of nanostructures in improving the photocatalytic performance under various irradiation conditions. The review reveals that structural engineering can enhance the photocatalytic performance of ZnO drastically compared to the conventional one. This perceptive article helps to understand the role of structural engineering in enhancing the photocatalytic performance of ZnO.