Bharathidasan University

Tuning Third-Order Nonlinear Optical Properties in Heterocycle-Dependent Hydrazono-1,3-Diketone Chromophores

Abstract Organic π-conjugated chromophores with tunable electronic structures are promising candidates for nonlinear optical (NLO) and optical limiting (OL) applications. Herein, we report a series of arylhydrazono-1,3-diketones incorporating pyrrole, N-methylpyrrole, thiophene,...

Copper‐Catalyzed C–H Insertion of N ‐Heterocycles Into Diazo Arylidene Succinimides

Copper(II) triflate is found to be an effective catalyst for the regioselective C–H insertion of heteroaromatic compounds into diazo arylidene succinimide‐based carbene precursors. Preferential C3–H insertion occurs in N ‐substituted and unsubstituted indoles, while selective C2–...

Green synthesis of copper oxide nanoparticles using Persea americana leaf extract for mosquito control and antibacterial activity

This study focuses on the green synthesis of copper oxide nanoparticles (CuO NPs) using Persea americana leaf extract to control dengue vectors and selected human pathogens. GC-MS profiling revealed phytoconstituents responsible for stabilization and capping during CuO NPs format...

Ecotoxicological Insights into Heavy Metal Dynamics in Cauvery Delta Wetland Sediments: Geochemistry, Speciation and Ecological Risk Indices

Wetland sediments in deltaic ecosystems act both as sinks and secondary sources of heavy metals, thereby influencing contaminant mobility, bioavailability, and ecological risk. The present study investigated the distribution, speciation, mobility, and ecological risk of Fe, Ni, P...

Unprecedented Open‐Ocean Polynya in Breid Bay, East Antarctica in Winter 2024

Abstract We document an unprecedented winter open‐ocean polynya in the Breid Bay, on 4 August 2024, attaining a maximum area of 89,121 km 2 . Prior to opening, sea‐ice concentration declined from ∼96% in early July to below 25% by 30 July 2024, indicating substantial precondition...

Fertilizer-Focused Stacked Ensemble Model for Explainable Paddy Yield Prediction Using Context-Residualized Nutrient Sensitivity Learning

Objectives: To build an explainable model that predicts paddy yields based on the fertilizer application, removing the influence of the climatic, irrigation and spatial factors. Method: The study suggests a new model called Fertilizer-Focused Stacked Ensemble Model (FFSEM). Conte...

Fast Severity Ordered Boundary Residual Learning for Multi-Class Knee Osteoarthritis Grading from X-Ray Images

Objectives: To develop a model for the classification of knee OsteoArthritis (OA) on radiographs, which is computationally efficient and severity ordered. Method: This study focuses on class imbalance, adjacent-grade confusion and high computational cost of multi-model hybrid sys...

Performance evaluation of solar flat plate collectors integrated with phase change materials for thermal storage

Solar flat-plate collectors (FPCs) have many applications in low-temperature thermal systems, but they are limited due to the intermittent nature of solar radiation, the small thermal storage capacity and the poor thermal conductivity of traditional phase change materials (PCMs)....

Developing Polymer Semi-Solid-State Gel Electrolyte with High-Performance Aqueous Zn-Mn Battery-Type Hybrid Capacitor Device for MnO2–MWCNT Cathode

In recent years, energy storage devices have had a lower energy density for supercapacitor devices. Fortunately, certain drawbacks limit the liquid-based battery-type aqueous zinc-ion hybrid capacitor electrodes. For this reason, zinc–manganese (Zn-Mn)-based zinc-ion hybrid super...

(3 + 2) Annulation of Indane-1,3-Dione-Based Spiro Donor–Acceptor Cyclopropanes with Thioureas: Entry to Iminodihydrothiophenes and Thienobenzazepinediones

Abstract Spiro donor–acceptor cyclopropanes (DACs) based on an indane-1,3-dione moiety underwent atypical ring cleavage during their Yb(OTf)3-catalyzed (3 + 2) annulation with thioureas. The gem-diamino tetrahydrothiophene intermediates initially formed in the annulation spontane...

Asymmetric excellence in stakeholder pathways through staff and student perceptions of implementing sustainable practices in Indian higher education

Higher education institutions (HEIs) play a pivotal role in promoting sustainable development through education, campus operations, and governance. However, the transition from formulating sustainability policies to adopting genuine sustainability practices is contingent on vario...

Hybrid Deep Reinforcement Learning with Kookaburra Optimization for QOS-Aware Bandwidth Allocation in GMPLS Optical Networks

Objectives: To address dynamic bandwidth allocation with strict Quality of Service (QoS) requirements in Generalized Multi-Protocol Label Switching (GMPLS) optical networks under strain from internet services, real-time multimedia, and cloud infrastructure. Method: A Hybrid Deep...

Bayesian Policy Optimization over Conceptual Lattices for Interpretable Personalized Learning

Objectives: To develop a framework that integrates pedagogical structure with uncertainty-aware decision-making for personalized learning in smart educational environments, addressing the limitations of current deep reinforcement learning approaches that treat curricula as unstru...

Enhancing Security in Software-Defined Networking from ARP Spoofing Attack Using Adaptive Encryption-Assisted Explainable Mish-Activated Recurrent Neural Network Framework

Objectives: To develop an MARNN framework for accurate ARP spoofing-based MITM attack detection and secure communication in SDN environments. Method: The approach involves preprocessing raw data from the ARP Spoofing-Based MITM Attack Dataset using Variable Stability Scaling (Var...

In vitro antioxidant activity and cytotoxic effects of sulfated galactan polysaccharides from Gracilaria spinulosa

This study investigated the extraction, chemical composition, structural characteristics, antioxidant activity, and in vitro cytotoxic potential of sulfated galactan polysaccharides (SGP) isolated from the red seaweed Gracilaria spinulosa collected from the Gulf of Mannar, Tamil...

Digital Paradox Navigation: A Second‐Order Cybernetic Framework for Organisational Reflexivity in Digital Transformation

ABSTRACT This study develops and empirically examines the Digital Paradox Navigation (DPN) framework, which integrates second‐order cybernetics with digital transformation theory to explain how organisations manage paradoxical tensions through reflexive self‐observation. Using a...

Photocatalytic degradation of crystal violet by AgBiO 3 /rGO-CNT nanocomposite under visible light irradiation

The synthesis and design of nanocomposite have been attracted to reducing environmental pollution. This study developed a combination of silver bismuthate (AgBiO3) and reduced graphene oxide/carbon nanotube (rGO-CNT) through the hydrothermal method to evaluate its photocatalytic...