Faculty Publications
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Item Learner centered design approach for E-learning using 3D virtual tutors(IEEE Computer Society help@computer.org, 2013) Mukherjee, S.; Singhal, H.; Jha, P.; Kokane, A.; Rastogi, P.; Mittal, R.; Guddeti, G.Most of the existing E-learning system designs have focused on the development of feature-rich, but usable systems with little effort in motivating students to develop interest in the teaching-learning process. This paper discusses the learner centered design approach for web-based tutoring to motivate young learners using 3D virtual tutors in a requirement-based, flexible pedagogical model. Students can choose course(s) and the study-mode. In the guided mode, the student is mentored by a human tutor, whereas a student in un-guided mode is tutored by 3D avatar. The student has access to study materials, educational videos and applets that are provided by the tutors, the student also has access to forums for doubt clearing and online assignments to be submitted for tutors' evaluation. Tutors can track students' progress using online quiz and reports modules. Further, tutors have access to teaching aids like online chat system and whiteboard-based teaching in a virtual classroom environment. © 2013 IEEE.Item CNN Based Tropical Cyclone Intensity Estimation Using Satellite Images Around Indian Subcontinent(Springer Science and Business Media Deutschland GmbH, 2024) Jha, P.; Sumam David, S.; Vijayasenan, D.In this work, we have used deep learning models for estimating tropical cyclone (TC) intensity using satellite images. This is an image to regression problem, where an image is given as input and intensity value is estimated as output. In the literature, various deep learning methods have been proposed for TC intensity estimation but their focus on cyclones around the Indian subcontinent is limited. We have implemented three models: regression model, classification model, and a multitask model having regression and classification output as two tasks. We have worked with two sets of input data. One set of data contains single channel input containing infrared (IR) brightness temperature satellite image. Another set of data contains two channel inputs having infrared (IR) brightness temperature satellite image as one of the channels, and rain rate derived from passive microwave (PMW) satellite image as another channel. We have used satellite images for cyclones occurring in the Atlantic, Northeast Pacific, and North Central Pacific regions from 2006 through 2016. For cyclones around the Indian subcontinent, we have used satellite images from 2005- 2016. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.Item Entropy engineering in I-V-VI2 family: a paradigm to bestow enhanced average ZT in the entire operating temperature regime(Royal Society of Chemistry, 2024) Basu, R.; Shenoy, U.S.; Pathak, A.; Singh, S.; Jha, P.; Bhat, D.K.; Basu, H.; Singh, A.The design and development of n-type alloys in the mid-temperature regime (500-700) K with enhanced thermoelectric performance is of utmost necessity for the fabrication of thermoelectric devices. In this regard, the I-V-VI2 family reveals superior thermoelectric performance, owing to the fact that group V elements have non-bonded electrons and high Z (atomic number), with a high Grüneisen parameter, which cause amplified anharmonicity and subsequently low intrinsic lattice thermal conductivity. However, the irony is that the well-studied alloy of this family, AgBiSe2, undergoes phase transition in the operating temperature range. Thus, of paramount importance is restricting the phase transition and bringing it down below room temperature (RT), along with stabilizing a highly symmetrical crystal structure in the extended operating temperature range. Efforts were made to synthesize a cubic n-type AgBiSeS alloy belonging to the I-V-VI2 compounds (unlike AgBiSe2) that is stabilized throughout the temperature range, as the S element aids in strengthening of the chemical bonds. In addition, the alloy was further stabilized by forming a solid solution with PbSe, which aids in increasing the configurational entropy and thereby increases the chemical space of the system. The resultant alloys possess intrinsically low lattice thermal conductivity ranging from 0.38-0.74 W m−1 K−1 in the entire operating range. Consequently, the peak ZT was reported as ∼0.6 at 780 K, with an average ZT value of 0.3 for the alloy (AgBiSeS)0.5(PbSe)0.5 within 300-823 K. Although the reported ZT is low, the methodology of entropy-driven structural stabilization in the operating temperature regime was adapted to attain a highly symmetrical, stable structure for practical applications. © 2024 RSC.Item Exploring MIL-101 (Cr) and Its Polymeric Composites as Potential Adsorbents for Volatile Iodine from Nuclear Off-gas: A Detailed Experimental and Computational Study(American Chemical Society, 2025) Kolay, S.; Kancharlapalli, S.; Samanta, S.; Muhiuddin, M.; Jha, P.; Pagare, A.; Mishra, R.Owing to the rapid growth of nuclear energy as a sustainable, affordable, and clean energy source, the entrapment of radioactive iodine released from the nuclear off-gas stream is considered a vital concern. We view MOFs as potential futuristic adsorbents for this remedy. Herein, we examined the gravimetric iodine adsorption characteristics of radiation and chemically stable MIL-101(Cr) and its polymeric composites with variation of temperatures. The saturation adsorption capacity shown by pristine MIL-101(Cr) is 4.1 g I2 g-1, and the saturation capacity of composites varies based on MIL-101(Cr)’s concentrations. MIL-101(Cr)@PES 2:1 shows an uptake capacity of 2.1 g I2 /gbead, which is ? 350% superior to the reported HKUST-1@PES and ?150% higher compared to MOF-808@PVDF0.7. Based on various spectroscopic studies and DFT calculations, probable host-guest interactions leading to enhanced I2 adsorption have been elucidated. The open Cr metal site acts as the initial adsorption site for I2 that gets converted into iodide and afterward to higher polyiodide through the transfer of charge from the host matrix. These findings suggest that MIL-101(Cr) can be considered one of the potential alternate adsorbents for radioactive iodine. © 2025 American Chemical Society.