Sri Ramakrishna Mission Vidyalaya College of Arts and Science, is a general degree college located at Coimbatore, Tamil Nadu. The college is affiliated with Bharathiar University. This college offers different courses in arts, commerce and science..
This work addresses the passivity disturbance analysis for delayed discrete-time systems under quantized event-triggered communication and deception attacks. To ease network load and minimize communication overhead, an event-triggered mechanism and a logarithmic quantizer are introduced individually. The influences of event-triggered, quantization, stochastic terms, and cyber attacks are combined within a single unified framework and by designing a suitable Lyapunov–Krasovskii functional (LKF), we establish sufficient conditions that ensure asymptotic stability of the system. The proposed method derives stability and passivity conditions that allow larger admissible delays and stronger tolerance to disturbances, leading to improved control performance. Building on these results, a resilient event-triggered control approach is formulated using linear matrix inequalities (LMIs). In addition, when external disturbances occur, further conditions are derived to guarantee system passivity. In the end, the proposed method demonstrates its effectiveness through four numerical simulation examples, which include comparative studies that assess control accuracy, achieving an approximately 83
Novel monophasic rare-earth yttrium ferrite (YFeO3) nanoparticles were prepared via a well-ordered hydrothermal method and systematically explored for their multi-functional purpose in energy storage and dye water treatment applications. By facilitating the hydrothermal process, the material undergoes precise control over crystalline growth, resulting in orthorhombic yttrium ferrite perovskite nanoparticles with high phase purity under various calcination temperatures of 500 °C, 700 °C, and 900 °C. FESEM results reveal the granular spherical shape with increased porosity for higher calcination temperatures. The VSM studies exhibit that the thermal incorporation enhances the magnetic properties of YFeO3, resulting in increased saturation magnetization (Ms) and coercivity. Electrochemical analysis was carried out using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectroscopy (EIS), established an exceptional capacitive behaviour of about 1579 F/g at 5 mV/s, with a remarkable cyclic stability, retained about 99%, in supercapacitor applications, while achieving 81% photocatalytic degradation of Methylene Blue dye within 100 min under visible-light irradiation. These outcomes emphasize that orthorhombic yttrium ferrite nanoparticles are a promising multifunctional material for the upcoming generation of energy storage gadgets and photocatalytic water treatment technologies.
Natural processes like photosynthesis involve complex electron transfer pathways, including both direct electron transfer (DET) and molecular wiring, which are essential for biological energy conversion and storage. Replicating such systems in artificial platforms remains a major scientific challenge. In this study, we successfully fabricated a bioelectrode comprising chlorophyll, specifically plant-derived chlorophyll a (Chla), molecularly wired with cytochrome c (Cytc) on a carbon black (CB)-modified electrode surface. This hybrid electrode, designated as CB@Cytc-Chla, was prepared using a simple solution-phase approach. The system demonstrated efficient DET between the protein ensemble and the electrode surface. Cyclic voltammetry in nitrogen-purged pH 7 phosphate buffer revealed a well-defined and reversible redox couple at E° = -0.2 V vs. Ag/AgCl, with a surface coverage value of 2.96 nmol cm-2. Control experiments using electrodes modified with individual proteins (Cytc or Chla alone) showed no such redox behavior, highlighting the importance of molecular wiring in the composite assembly. To probe specific interactions between Chla and Cytc, in situ electrochemical quartz crystal microbalance (EQCM) analysis was performed, confirming strong binding affinity. Furthermore, in situ scanning electrochemical microscopy (SECM) in feedback mode revealed distinct electroactive sites on the bioelectrode surface. Under simulated solar illumination, the CB@Cytc-Chla bioelectrode produced a significantly enhanced photocurrent compared to the control electrodes with individual components, indicating effective photo-induced charge transfer. The selective electrochemical reduction of hydrogen peroxide (H2O2) was explored as a model reaction at neutral pH, where the hybrid bioelectrode exhibited the highest current response relative to the protein-only modified electrodes. As a demonstration of practical utility, a selective batch-injection analysis of H2O2 was carried out using a three-in-one disposable screen-printed electrode modified with the CB@Cytc-Chla composite. This system, integrated with a prototype wireless device, enabled sensitive one-drop detection of reactive oxygen species (ROS) released from chemically stressed cancer cells.
We successfully synthesized and crystallized (E)-Nʹ-(4-(dimethylamino)benzylidene)-4-nitrobenzohydrazide (NBHDMAB), a Schiff base compound. Elemental analysis confirmed its formation, and recrystallization further purified the compound. Single-crystal X-ray diffraction analysis revealed that the compound crystallizes in a monoclinic system with the space group P21/C. Powder X-ray diffraction (PXRD) analysis confirmed the crystallinity of the compound. In our investigation of the optical properties of the molecule NBHDMAB, we used UV–Vis-NIR spectroscopy. The results showed excellent agreement between the experimental and theoretical spectra. The molecule exhibits high transmittance in the visible and near-infrared (NIR) regions, with a lower cut-off wavelength at 400 nm. The optical band gap, determined experimentally and confirmed by theoretical calculations, suggests that NBHDMAB possesses semiconducting behavior. Further computational studies were conducted to gain a deeper understanding of the molecule's structural and optical characteristics. The theoretically calculated UV and FT-IR spectra were found to be in good agreement with the experimental data. Additionally, we performed analyses of the Hirshfeld surfaces, computed the hyperpolarizability, and determined the density of states.
In this paper, the solutions comprising pure In2O3 and lanthanum doping levels of 1.5, 3.0 and 4.5 wt% were synthesized in this work using jet nebulizer spray pyrolysis. These changes made it possible to use XRD, SEM, PL, XPS and UV-visible analysis to study the characteristics of La:In2O3 thin films. The XRD examination demonstrated that the rod-like films had a singular cubic crystal structure, where as SEM validated their rod-shaped morphology. The XPS findings showed that In, La and O were present. When the La:In2O3 concentration increased, the film bandgap decreased from 3.89 to 3.69 eV. Tests utilizing methyl orange (MO) and crystal violet (CV) dyes to evaluate the degradation efficiency of the film under sunlight irradiation that the film containing 4.5 wt% La:In2O3 exhibited the highest activity and rate constant after 120 min. This outcome indicates that this particular concentration is optimal for photocatalytic performance. Overall, the results suggest that these films could be advantageous for high-performance wastewater treatment when fabricated with 4.5 wt% La:In2O3.
