Browsing by Author "Shubham Gupta"

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Assessment of topsoil contamination in an urbanized interfluve region of Indo-Gangetic Plains (IGP) using magnetic measurements and spectroscopic techniques
(Springer International Publishing, 2019) Abhishek Kumar Rai; Anuj Kumar Singh; Jayanta Kumar Pati; Shubham Gupta; Munmun Chakarvorty; Ambalika Niyogi; Anamika Pandey; Mrigank Mauli Dwivedi; Kamlesh Pandey; Kuldeep Prakash
The magnetic susceptibility (MS) measurements are used for rapid and cost-effective soil surveys and for accessing heavy metal contamination worldwide. In the sub-Himalayan plains of India, nearly 6.05 × 104 km2 area of most the fertile land occurs as interfluve of Late Quaternary age between the two major glacier-fed rivers (Ganga and Yamuna). The vast areal expanse of interfluve terminates at the rivers’ confluence in Sangam (25°25′13″N-81°53′22″E), Allahabad. This is the first study of MS soil survey of the interfluve region at the confluence comprising 490 samples from 49 locations. The MS values are between 8.84 and 261.25 × 10−8 m3 kg−1 and the change is more pronounced (8.84–312.65 × 10−8 m3 kg−1) with increasing depth. A sudden increase in the MS between 12- (11.28–303.32 × 10−8 m3 kg−1) and 14-cm (11.21–238.45 × 10−8 m3 kg−1) depth is observed similar to observations worldwide. The high MS hotspots are aligned parallel to major traffic networks of the city suggesting a major contribution emanating from the anthropogenic load. A significant difference has been noted in the MS values of present-day mid-channel bar sediments of Ganga (25.24 × 10−8 m3 kg−1) and Yamuna (116.47 × 10−8 m3 kg−1) Rivers. The laser-induced breakdown spectroscopy (LIBS) data showed the presence of heavy (Fe, Ti, Cr, Cu, Cd, Zn, and Pb) and light (H, C, N, and O) elements supporting MS data. The concentration of toxic elements predicted by partial least squares regression (PLSR) approach concurs with magnetic measurements. The topsoil MS values increase up to a depth of ~ 6.25 cm suggesting the dominant role of anthropogenic source for the increased heavy metal concentration compared with basement contributions. © 2019, Springer Nature Switzerland AG.
Bandgap Modulation of Hydrothermally Synthesized CZTS Nanoparticles through Ni Incorporation
(Springer, 2025) Yogesh Kumar Saini; Sanju Mahich; Shubham Gupta; Rishabh Kumar; Chandra Shekhar Pati Tripathi; Anuj Kumar; Sarita Kumari; Sanjay Kumar Swami; Amanpal K. Singh
Kesterite (Cu2ZnSnS4) has gained significant attention in optoelectronic materials research for future solar energy applications due to its composition of earth-abundant elements, nontoxic nature, and cost-effectiveness as a p-type semiconductor material. This study investigates the effect of Ni doping on Cu2Zn1−xSnS4Nix nanoparticles (NPs) synthesized via the hydrothermal method, with varying Ni concentrations (x = 0, 0.005, 0.01, 0.05, 0.1). x-ray diffraction (XRD) and Raman spectroscopy confirm the retention of the kesterite structure with high crystallinity, while x-ray photoelectron spectroscopy (XPS) verifies the incorporation of Ni2+ ions into the Cu2ZnSnS4 (CZTS) lattice. The oxidation states of the Ni+2 metal dopants are clear from the XPS analysis. Field-emission scanning electron microscopy (FESEM) and energy-dispersive x-ray (EDX) analysis reveal changes in particle morphology and elemental distribution due to Ni doping, with FESEM images showing that the particle size of CZTS NPs ranges from 100 nm to 150 nm as the Ni concentration increases. High-resolution transmission electron microscopy (HRTEM) shows clear lattice fringes of both pristine and Ni-doped samples, confirming the crystallinity and highlighting minor distortions in the lattice due to Ni incorporation, which introduces lattice strain. Ultraviolet–visible–near-infrared (UV-Vis-NIR) spectroscopy shows a significant reduction in the optical bandgap from 1.50 eV for pristine CZTS to 1.38 eV for Ni-doped samples, highlighting the importance of bandgap tailoring to optimize CZTS NPs for enhanced solar energy absorption. © The Minerals, Metals & Materials Society 2025.
Investor’s satisfaction in artificial intelligence-supported share trading apps: mediation and parallel moderation analysis
(Routledge, 2024) Shubham Gupta; Anurag Singh
Recognizing the critical role of artificial intelligence (AI) in share trading and considering the technical complexities in artificial intelligence-supported share trading apps (AI-STA), the paper investigates retail investor’s satisfaction (SFN) in AI-STA using expectation disconfirmation theory. The researchers proposed the mediation of information quality (IQ), and parallel moderations of self-efficacy and disconfirmation in perceived usefulness (PU) and SFN relationship. The responses were collected using a carefully crafted survey instrument from 432 users of AI-STA through purposive sampling. Thereafter checking the psychometric properties, the data was analyzed using AMOS and SPSS-Hayes PROCESS Marcos (model # 2 and 4). The results of the hypothesis testing indicate that PU influences SFN. The mediation effect of IQ was also found significant in the relationship between PU and SFN. Moreover, the result supported the parallel moderating effects of self-efficacy and disconfirmation in the PU and SFN relationship. The mediation of IQ and parallel moderation of self-efficacy and disconfirmation is a noble contribution to the knowledge of expectation disconfirmation theory. The study acknowledges practical implications to enhance the interface of AI-STA for SFN, by incorporating real- time financial news and 24X7 customer support. © 2024 Taylor & Francis Group, LLC.
Investor’s satisfaction in artificial intelligence-supported share trading apps: mediation and parallel moderation analysis
(Routledge, 2025) Shubham Gupta; Anurag Singh
Recognizing the critical role of artificial intelligence (AI) in share trading and considering the technical complexities in artificial intelligence-supported share trading apps (AI-STA), the paper investigates retail investor’s satisfaction (SFN) in AI-STA using expectation disconfirmation theory. The researchers proposed the mediation of information quality (IQ), and parallel moderations of self-efficacy and disconfirmation in perceived usefulness (PU) and SFN relationship. The responses were collected using a carefully crafted survey instrument from 432 users of AI-STA through purposive sampling. Thereafter checking the psychometric properties, the data was analyzed using AMOS and SPSS-Hayes PROCESS Marcos (model # 2 and 4). The results of the hypothesis testing indicate that PU influences SFN. The mediation effect of IQ was also found significant in the relationship between PU and SFN. Moreover, the result supported the parallel moderating effects of self-efficacy and disconfirmation in the PU and SFN relationship. The mediation of IQ and parallel moderation of self-efficacy and disconfirmation is a noble contribution to the knowledge of expectation disconfirmation theory. The study acknowledges practical implications to enhance the interface of AI-STA for SFN, by incorporating real- time financial news and 24X7 customer support. © 2024 Taylor & Francis Group, LLC.
Operational 500 m surface soil moisture product using EOS-04 C-band SAR over Indian agricultural croplands
(Indian Academy of Sciences, 2024) Dharmendra Kumar Pandey; Prashant Kumar Srivastava; Rucha Dave; Raj K. Setia; Ompal; Rajiv Sinha; Muddu Sekhar; Manish Parmar; Shubham Gupta; Deepak Putrevu; Raghav Mehra; V. Ramanujam; Bimal Kumar Bhattacharya; Raj Kumar
Surface soil moisture (SSM) at high spatial resolution is an essential land parameter for agricultural applications like irrigation mapping, scheduling, crop water stress assessment, etc. However, available satellite derived soil moisture products are inadequate for meeting the requirements of agricultural applications due to coarse scale soil moisture (~10–40 km). In this article, we developed an operational framework for first of its kind sub-km (~500 m) operational soil moisture product over India by utilizing ISRO’s EOS-04 C-band synthetic aperture radar (SAR) data based on active-passive approach. The potential of EOS-04 SAR for sub-km scale is demonstrated and tested over major cropland sites covering highly heterogeneous and dynamic crop conditions in different agro-climatic regions over India which shows a good agreement with in situ datasets with mean ubRMSE, ranging from 0.051 to 0.078 m3/m3. © (2024), (Indian Academy of Sciences). All rights reserved.
Perceived relative advantage and value creation in metaverse adoption: a study of e-retail entrepreneurs
(Emerald Publishing, 2025) Anurag Kumar Singh; Shubham Gupta
Purpose – This study examines how perceived relative advantage (PAA) of the metaverse impacts change readiness for metaverse adoption (CRM) and subsequently value creation. The mediation of perceived compatibility (PCT), the moderation of perceived complexity, and the moderated-moderation of metaverse anxiety and metaverse self-efficacy were also examined. Design/methodology/approach – The research model, developed by synthesising the Diffusion of Innovation Theory and the Technology Readiness Acceptance Model, was analysed using models #4, #1, and #18 of the PROCESS macros, based on 416 responses collected through systematic sampling from Indian e-retail entrepreneurs. Findings – The results indicate (1) PAA positively influenced CRM and PCT, (2) PCT positively influenced CRM, (3) PCT partially mediated perceived PAA-CRM, (4) CRM influenced value creation, (5) perceived complexity moderated PAA-CRM, and (6) metaverse anxiety and metaverse self-efficacy have shown three-way interaction in PCT-CRM relationship. Originality/value – The mediation of PCT and moderated-moderation is a novel concept, described in both theoretical and practical implications. © 2025 Emerald Publishing Limited
Repurchase Intention in Mobile Augmented Reality Apps: Insights Through the Lenses of Theory of Interactive Media Effects
(Taylor and Francis Ltd., 2025) Shubham Gupta; Anurag Singh; Sanjeev Prashar
The research examines the factors influencing repurchase intention (RPI) of Mobile Augmented Reality (MAR) eyewear apps. The influence of media characteristics including perceived interactivity (PRI) and perceived augmentation (PAGM) on customer experience (CUSEXP) and RPI using the Theory of Interactive Media Effects (TIME) has been investigated. Research examined mediation of CUSEXP in PRI-RPI and PAGM-RPI as well as moderation of perceived risk (PR) in PAGM and CUSEXP relationship. The data was collected from 406 respondents using purposive sampling. The findings are: a) PRI and PAGM have a significant influence on RPI. b) PRI and PAGM have an influence on the CUSEXP. c) CUSEXP has a significant effect on RPI. d) PR acts as a moderator and it dampens the positive relationship between PAGM and CUSEXP. e) CUSEXP mediates the PRI-RPI and PAGM-RPI relationship. The mediation of CUSEXP in AR media characteristics and RPI relationship as well as the moderation of PR in PAGM and CUSEXP relationship is the novel contribution. © 2024 Taylor & Francis Group, LLC.
Repurchase Intention in Mobile Augmented Reality Apps: Insights Through the Lenses of Theory of Interactive Media Effects
(Taylor and Francis Ltd., 2024) Shubham Gupta; Anurag Singh; Sanjeev Prashar
The research examines the factors influencing repurchase intention (RPI) of Mobile Augmented Reality (MAR) eyewear apps. The influence of media characteristics including perceived interactivity (PRI) and perceived augmentation (PAGM) on customer experience (CUSEXP) and RPI using the Theory of Interactive Media Effects (TIME) has been investigated. Research examined mediation of CUSEXP in PRI-RPI and PAGM-RPI as well as moderation of perceived risk (PR) in PAGM and CUSEXP relationship. The data was collected from 406 respondents using purposive sampling. The findings are: a) PRI and PAGM have a significant influence on RPI. b) PRI and PAGM have an influence on the CUSEXP. c) CUSEXP has a significant effect on RPI. d) PR acts as a moderator and it dampens the positive relationship between PAGM and CUSEXP. e) CUSEXP mediates the PRI-RPI and PAGM-RPI relationship. The mediation of CUSEXP in AR media characteristics and RPI relationship as well as the moderation of PR in PAGM and CUSEXP relationship is the novel contribution. © 2024 Taylor & Francis Group, LLC.