Sri Ramakrishna Engineering College

About: Sri Ramakrishna Engineering College is a based out in . It is known for research contribution in the topics: Computer science & Control theory. The organization has 1030 authors who have published 843 publications receiving 3822 citations.

CBMIR: Content Based Medical Image Retrieval System Using Texture and Intensity for Dental Images

Abstract: Image retrieval systems attempt to search through a database to find images that are perceptually similar to a query image. This work aims to develop an efficient visual-Content-based technique to search, browse and retrieve relevant images from large-scale of medical image collections Features play a vital role during the image retrieval. The various features that can be extracted are texture, color, intensity, shape, resolution, global and local features etc. In this work, we concentrate on the specific medical domain. The features such as color may not prove to be a very efficient method because the medical domain largely deals with the gray scale images. The features explored in this work are intensity, texture. The first step is to extract the texture feature and the intensity feature from the given input image. Then the both features are combined to form the single feature vector of the image by using the fusion method. The resulting image is compared to the images in the database. The N top most similar images are then retrieved from the database.

Power electronics interface for hybrid renewable energy system — A survey

Abstract: Renewable energy is gaining its importance widely on because of continuous degrading of conventional energy resources. Due to the intermittent availability of renewable energy sources which makes the system variable in nature, the involvement of power electronic components gain its importance. This paper investigates the various methods practiced in power electronic interfaces to tap energy from hybrid renewable energy sources. Advanced trends in power electronics for the integration of solar and wind power generators are discussed. This paper also investigates the efficient storage system technology for hybrid wind solar power generation system.

Band gap engineering in ZnO based nanocomposites

Abstract: In the present work, individual zinc oxide (ZnO), tin oxide (SnO2) and vanadium oxide (V2O5), their binary and ternary combinations were prepared via hydrothermal route. The structure and the morphology of all the samples were characterised using X-ray Diffractometer (XRD) and Field Emission Scanning Electron Microscopy (FE-SEM) and Raman spectroscopic tools. UV–Visible spectroscopic analysis was recorded for all the samples. The samples were also tested for ethanol sensing (0 ppm–300 ppm) at room temperature. It has been focussed on to investigate the Raman and UV spectroscopic studies on the ethanol sensing properties of these oxides. It is observed that the Raman peaks of the binary and ternary systems shifted to lower wavenumber compared to their bulk and it is attributed to the tensile stress experienced by the nanocomposite. The peculiar hierarchical nanostructures of zinc – tin – vanadium oxide (ZTV) nanocomposite with larger surface area (167.3 m2/g) provided the required active surface sites for the adsorption of ethanol molecules. The band gap of ZTV is calculated as 1.97 eV. This band gap narrowing observed in ZTV might be due to the competing effects of high free carrier concentration and Burstein-Moss shift. Hence ZTV shows pronounced sensitivity of 98% at a response time of 32 s and recovery time of 6 s. Moreover the synergistic effect of ZTV nanocomposite enhanced the sensitivity at a faster rate by overcoming the problems associated with the energy consumption, reversibility, adsorptive capacity and fabrication cost.

Thermal and energy management prospects of γ-AlOOH hybrid nanofluids for the application of sustainable heat exchanger systems

Abstract: This study focuses on double-tube heat exchanger (DTHE) to numerically examine their thermal performance by considering two types of hybrid nanofluids: (i) TiO2-γ-AlOOH/water and (ii) TiO2-γ-AlOOH/ethylene glycol. γ-AlOOH is an efficient material for heat transfer application. The heat exchanger consists of two tubes, which are called the inner and the outer tubes. The coolant and the hot oil, respectively, flow into the inner and the outer tubes. The volume proportion and volume fraction of nanoparticles are 90:10 (γ-AlOOH/TiO2) and from 0.1 to 0.5%, respectively. The rates of mass flow, alongside the heat transfer rate and the pumping power, are evaluated. The employed model to solve the governing equations is a multiphase mixture, validated with earlier reports. The boundary conditions are reliable for industry deployment. When TiO2-γ-AlOOH/water is employed rather than TiO2-γ-AlOOH/EG, 50% improvement in heat transfer rate is obtained. It is noted that TiO2-γ-AlOOH/EG possesses a higher (30%) pumping power than TiO2-γ-AlOOH/water. However, to estimate the energy consumption in industrial scale, an additional analysis on pumping power of heat exchanger with EG-based coolants are needed in the future.

Effect of Annealing Temperature on Structural and Electrical Properties of Al/ZrO2/p-Si MIS Schottky Diodes

Abstract: The structural and electrical properties of Al/ZrO2/p-Si Schottky barrier diodes (SBDs) have been investigated at different annealing temperatures (300, 400, 500 and 600 °C). X-ray diffraction (XRD) analysis shows that the film annealed at 600 °C exhibits better crystalline nature with monoclinic phase. X-ray photoelectron spectroscopy (XPS) analysis reveals that the oxidation state of ZrO2 film is Zr4+. The scanning electron microscopy (SEM) image shows that the film annealed at 600 °C exhibits sub-micro-sized and square-shaped grains. The thermionic emission (TE) model determines the diode parameters such as barrier height (ΦB), ideality factor (n), series resistance (Rs) and saturation current density (Js) from J–V characteristics and Cheung’s method. The ideality factor of the Al/ZrO2/p-Si diodes decreases (3.772–3.442) with increasing annealing temperature (300–600 °C).