Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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Author: search.filters.author.Kumar, C.

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    Sub-pixel mineral mapping using EO-1 hyperion hyperspectral data
    (International Society for Photogrammetry and Remote Sensing, 2014) Kumar, C.; Shetty, A.; Raval, S.; Champatiray, P.K.; Sharma, R.
    This study describes the utility of Earth Observation (EO)-1 Hyperion data for sub-pixel mineral investigation using Mixture Tuned Target Constrained Interference Minimized Filter (MTTCIMF) algorithm in hostile mountainous terrain of Rajsamand district of Rajasthan, which hosts economic mineralization such as lead, zinc, and copper etc. The study encompasses pre-processing, data reduction, Pixel Purity Index (PPI) and endmember extraction from reflectance image of surface minerals such as illite, montmorillonite, phlogopite, dolomite and chlorite. These endmembers were then assessed with USGS mineral spectral library and lab spectra of rock samples collected from field for spectral inspection. Subsequently, MTTCIMF algorithm was implemented on processed image to obtain mineral distribution map of each detected mineral. A virtual verification method has been adopted to evaluate the classified image, which uses directly image information to evaluate the result and confirm the overall accuracy and kappa coefficient of 68% and 0.6 respectively. The sub-pixel level mineral information with reasonable accuracy could be a valuable guide to geological and exploration community for expensive ground and/or lab experiments to discover economic deposits. Thus, the study demonstrates the feasibility of Hyperion data for sub-pixel mineral mapping using MTTCIMF algorithm with cost and time effective approach.
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    The experimental analysis of heat transfer characteristics of a hot surface impinged by a lateral air jet
    (American Institute of Physics, 2025) Kumar, C.; Madav, V.
    This experimental investigation explores the heat transfer dynamics caused by lateral air jet impingement on a hot, thin stainless steel foil. The aim is to understand the heat transfer characteristics of air jet impinging laterally on the top surface. This setup is relevant to industrial cooling applications where space is limited. Using a thermal imaging camera, the study captures the steady-state temperature distribution across the foil surface. The experiment was conducted by varying the jet exit to stagnation point-to-diameter (S/d) ratios for the lateral jet (2 to 20). The study was carried out for Reynolds number 3000. Keeping electronic chip temperatures below a critical threshold is crucial, as excessive heat can cause performance issues, chip damage, and even pose safety risks in extreme cases. To address the substantial cooling needs of heat-generating chips, a variety of methods and technologies have been explored, including heat pipes, pool boiling, microchannel heat sinks, spray cooling, and jet impingement, among others. The findings show that the lateral jets is good choice for electronic cooling applications when the localized cooling is necessary, and by keeping specific S/d value wider area cooling can also be achieved. It is observed that at S/d=8 maximum Nu is achieved and as S/d is increased further cooling area coverage is widening even though the maximum Nu achieved is comparatively less. This study offers valuable insights into optimizing air jet impingement techniques for enhanced thermal management in various technological domains. © 2025 Author(s).