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2022 International Conference on applied Research in Engineering sciences, ICAREs 2022

作者： Athokpam, sushma Jeevan Fernandes, Brian Ram.s., K.P. mallikarjunaiah, K.J. Department of Physics M.S. Ramaiah University of Applied Sciences Bengaluru560058 India Department of Physics Indian Institute of Science Bengaluru560012 India

In this communication, we report the physical and optical properties of xZnO-(60-x)TeO2-40V2O5(x = 20, 25, 30, 35, and 40 mol%) glass systems. The glasses were prepared using the melt-quenching method. The amorphous nature of the glass systems was confirmed using powder X-ray diffraction. We have elucidated the changes in the rigidity and elastic moduli of the glass system as a function of composition. These changes were measured in terms of changes in the physical parameters like density, molar volume, and packing density of the glasses. The elastic moduli of the glass systems, like Young's modulus, bulk modulus, shear modulus, longitudinal modulus, and Poisson's ratio, were estimated using makishima-mackenzie's theory. The changes in the elasticity of the present system were correlated with the structural changes occurring in the glasses by adding ZnO at the expense of TeO2. The optical properties of the glass system were found by means of diffuse reflectance spectroscopy. Using Kubelka munk method, the corresponding band gap energy and Urbach energy of the glass system were estimated. The present investigation sheds light on understanding the concentration effect of ZnO in the glass network. © 2023 Elsevier Ltd. All rights reserved.

关键词： Optical properties

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Electrical conductivity and dielectric study of zinc substituted tellurovanadate glass systems

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Ceramics International 2025年

作者： Athokpam, sushma madolappa, shivanand Fernandes, Brian Jeevan Ram.s., K. Ram.s., K.P. mallikarjunaiah, K.J. Department of Physics M.S. Ramaiah University of Applied Sciences Bengaluru560058 India Department of Physics Indian Institute of Science Bengaluru560012 India

Impedance spectroscopy is a powerful tool in understanding the conduction mechanism in materials. In the present study, xZnO.(60−x)TeO2.40V2O5 (x = 20, 25, 30, 35, 40 mol%) glasses were synthesized using the conventional melt-quenching method. The effect of ZnO on the dielectric constant, electric modulus and complex impedance spectra was studied using impedance spectroscopy. This study permits us to understand the microscopic processes responsible for the electric response and the relaxation behaviour observed in the material. The present investigation was carried out over a wide frequency range (40 Hz−20 mHz) and various temperatures from 30 to 250 °C. The data obtained from the impedance analyzer in R-C mode were converted to the desired parameters using the standard relations. The Nyquist plot revealed two semicircles, indicating the contribution from the bulk and the glass/electrode interface. The observation of a depressed semicircle revealed the existence of a non-Debye-type relaxation process. The dc conductivity was found to decrease with an increase in ZnO from ∼10−3 s m−1 at 20TVZ to ∼10−5 s m−1 at 40TVZ. Relaxation tim.s.obtained from the frequency explicit plots of the imaginary part of the impedance (Z″) and electric modulus (m″) follows Arrhenius's law. The fluctuating behaviour of activation energy with ZnO concentration is attributed to the combined effect of ionic and electronic conduction mechanisms observed in the system. A comparison between dielectric loss (tan δ), Z″ and m″ inferred the presence of both long-range conductivity and dipole relaxation mechanisms in the present glass system. © 2025 Elsevier Ltd and Techna Group s.r.l.

关键词： Dielectric losses

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Effect of the zinc substitution on the physical and optical properties of tellurium vanadate glasses

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materials Today: Proceedings 2023年 89卷 113-118页

作者： sushma Athokpam Brian Jeevan Fernandes K.P. Ram.s. K.J. mallikarjunaiah Department of Physics M.S. Ramaiah University of Applied Sciences Bengaluru 560058 India Department of Physics Indian Institute of Science Bengaluru 560012 India

In this communication, we report the physical and optical properties of x ZnO-(60- x )TeO 2 -40V 2 O 5 ( x = 20, 25, 30, 35, and 40 mol%) glass systems. The glasses were prepared using the melt-quenching method. The amorphous nature of the glass systems was confirmed using powder X-ray diffraction. We have elucidated the changes in the rigidity and elastic moduli of the glass system as a function of composition. These changes were measured in terms of changes in the physical parameters like density, molar volume , and packing density of the glasses. The elastic moduli of the glass systems, like Young's modulus , bulk modulus, shear modulus, longitudinal modulus, and Poisson's ratio , were estimated using makishima-mackenzie's theory. The changes in the elasticity of the present system were correlated with the structural changes occurring in the glasses by adding ZnO at the expense of TeO 2 . The optical properties of the glass system were found by means of diffuse reflectance spectroscopy . Using Kubelka munk method, the corresponding band gap energy and Urbach energy of the glass system were estimated. The present investigation sheds light on understanding the concentration effect of ZnO in the glass network.

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Dual Role of Zno and its Impact on Thermal and structural Properties of Tellurium-Vanadate Glass system

SSRN

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ssRN 2024年

作者： mallikarjunaiah, K.J. Athokpam, sushma Fernandes, Brian Jeevan Ram.s., K.P. Department of Physics M.S. Ramaiah University of Applied Sciences Bengaluru560058 India Department of Physics Indian Institute of Science Bengaluru560012 India

In the present study, we have synthesized Tellurium vanadate glasses with xZnO-(60-x)TeO2-40V2O5 (x = 20, 25, 30, 35, and 40 mol%) using the conventional melt-quenching method. The effect of ZnO concentration on the glass network is studied using DsC, Raman and IR studies. The glass transition temperature (Tg ) was found to increase with ZnO content. spectral analysis showed that the short-range structure of the present glass system consists of TeO4 (trigonal bipyramidal), TeO3+1 polyhedra and TeO3 (trigonal pyramidal) groups along with four-fold VO4 and five-fold VO5 coordinated vanadium groups. Further, the results indicatet the replacement of TeO2 by ZnO mainly leads to the conversion of the VO5 structural unit to the VO4 structural unit. The changes in the structural unit are attributed to ZnO acting as a network modifier at lower concentrations while, as the ZnO content further increases, it acts as a network former in the glass system. © 2024, The Authors. All rights reserved.

关键词： Tellurium compounds

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Anomalous properties of spark plasma sintered boron nitride solids

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materials Today 2025年 86卷 42-51页

作者： Biswas, Abhijit serles, Peter Alvarez, Gustavo A. schimpf, Jesse Hache, michel Kong, Jonathan Demingos, Pedro Guerra Yuan, Bo Pieshkov, Tymofii s. Li, Chenxi Puthirath, Anand B. Gao, Bin Gray, Tia Zhang, Xiang murukeshan, Jishnu Vajtai, Robert Dai, Pengcheng singh, Chandra Veer Howe, Jane Zou, Yu martin, Lane W. Clancy, Jam.s.Patrick Tian, Zhiting Filleter, Tobin Ajayan, Pulickel m. Department of Materials Science and Nanoengineering Rice University HoustonTX77005 United States Department of Mechanical & Industrial Engineering University of Toronto 5 King's College Road TorontoM5S 3G8 Canada Sibley School of Mechanical and Aerospace Engineering Cornell University IthacaNY14853 United States Department of Materials Science and Engineering University of California Berkeley94720 United States Department of Materials Science and Engineering University of Toronto 184 College St TorontoM5S 3E4 Canada Department of Physics and Astronomy McMaster University HamiltonL8S 4M1 Canada Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley94720 United States

Hexagonal boron nitride (h-BN) is a brittle ceramic with a layered structure, however, recent experiments have suggested that inter-layer structural engineering could be key to new structural and functional properties. Here we report the scalable bulk synthesis of high-density crystalline h-BN solids, by using high-temperature spark plasma sintering (sPs) of h-BN powders, which show high values of mechanical strength, ductility, dielectric constant, thermal conductivity, and exceptional neutron radiation shielding capability. Through exhaustive characterizations we reveal that sPs induces non-basal plane crystallinity, twisting of layers, and facilitates inter-grain fusion with a high degree of in-plane alignment across macroscale dimensions, resulting in near-theoretical density and improved properties. Our findings highlight the importance of material design, via new approaches such as layer twisting and interlayer interconnections, to create novel ceramics with properties that could go beyond their intrinsic limits. © 2025

关键词： Ductility

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Characterisation of Hβ spectra from EXO 051910+3737.7 X-rays binaries

arXiv

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arXiv 2025年

作者： Nuchvanichakul, Pornisara Irawati, Puji Rittipruk, Pakakaew Gandhi, Poshak Knigge, Christian Charles, Phil Wannawichian, suwicha M.S. Program in Applied Physics Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai50200 Thailand Department of Physics and Astronomy University of Southampton Southampton United Kingdom National Astronomical Research Institute of Thailand Chiang Mai50180 Thailand Department of Physics and Materials Science Faculty of Science Chiang Mai University Chiang Mai50200 Thailand

We investigate the spectral characteristics of the Be/X-ray binary system, EXO 051910+3737.7, in which Be/X-ray systems are the largest sub-class of high-m.s. X-ray binaries. spectroscopic observations are taken by the Thai National Telescope (TNT) with a medium-REsolution spectrograph (mREs) instrument for seven nights spanning from 2020 to 2021. Our primary focus is directed towards the analysis of two Balmer lines, namely Hα and Hβ, given that Be stars typically exhibit em.s.ion features in at least one of these hydrogen Balmer lines during certain phases. Our observations reveal split Balmer em.s.ion lines throughout the entire duration of our monitoring. Double Gaussian profiles were employed for line fitting to characterize these lines. The presence of double peaks in the Balmer lines indicates the presence of asymmetries within the circumstellar disc. We then analyze V/R variations and the changes in Hβ spectra. Our analysis of V/R variation which Violet (V) and Red (R) peak intensity components, revealed rapid fluctuations occurring within a single day, although determining the precise periodicity was constrained by instrumental limitations and the duration of observability. Furthermore, employing observed the wavelength differences (∆λ) in conjunction with typical Be star parameters allowed us to estimate the radius (rβ) of the Hβ emitting envelope. The average value was calculated to be 2.585r∗, with a standard deviation of 0.050r∗ © 2025, CC BY-NC-ND.

关键词： stars

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Cu₂sns₃ nano-spheres as a potent therapeutic agents: exploring their antibacterial, antioxidant, and cytotoxic competencies

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Journal of Nanoparticle Research 2025年第2期27卷 1-21页

作者： Raval, Jolly B. Chaki, sunil H. Patel, sefali R. Vaidya, Yati H. Khimani, Ankurkumar J. Thakor, Parth Thakkar, Anjali B. Deshpande, milind P. P. G. Department of Physics Sardar Patel University Gujarat VallabhVidyanagar388120 India Department of Microbiology Shri A. N. Patel P. G. Institute of Science and Research Gujarat Anand388001 India Department of Physics Shri A. N. Patel P. G. Institute of Science and Research Gujarat Anand388001 India B. D. Patel Institute of Paramedical Sciences Charotar University of Science and Technology CHARUSAT Campus Gujarat Changa388421 India Department of Applied & Interdisciplinary Sciences CISST Sardar Patel University Gujarat Vallabh Vidyanagar388120 India P. G. Department of Biosciences Sardar Patel University Satellite Campus Bakrol-Vadtal Road Gujarat Bakrol388315 India Department of Applied Physics Faculty of Technology and Engineering The M.S. University of Baroda Gujarat Vadodara390002 India

Cu₂sns₃ (CTs) is potent substitute for conventional compounds due to adjustable bandgap, conductivity of p-type, adaptable morphology, easy to synthesize, and superior thermoelectric properties. In this work, the CTs nano-spheres are synthesized by hydrothermal technique. The synthesized CTs nano-spheres are employed for the antibacterial, antioxidant, and cytotoxic application. structural analysis by X-ray diffraction confirms cubic unit cell structure of CTs nano-spheres. The energy-dispersive X-ray analysis showed CTs nano-spheres to be copper-rich and tin-deficient. scanning electron microscopy images revealed nano-spheres with needle-like surface features. The CTs nano-spheres possess direct bandgap of 1.58 eV, confirmed by diffuse reflectance spectroscopy. The antibacterial activity shows 100% activity index with higher zone of inhibition in Listeria monocytogenes and staphylococcus aureus. The antioxidant activity of CTs nano-spheres determined using the DPPH assay showed IC50 value of 61.60 µg/ml stating moderate antioxidant efficiency. The in vitro cytotoxic analysis is carried out by employing A549 lung cancer cell lines. The in vivo and vitro cytotoxic analysis provided the potent cytotoxicity of CTs nano-spheres, as reflected in LC50 value of 40.40 µg/ml and IC50 value of 57.75 ± 2.34 μg/ml. The mechanistic evolution of CTs nano-spheres for their antibacterial activity is proposed in this work. The leaching behaviour of CTs nano-spheres revealed higher leaching of sn4+ ions than Cu+ ions, contributing to their strong antibacterial activity. The zeta potential of CTs nano-spheres is found to be − 30.70 mV, which showed less agglomeration of CTs nano-spheres, depicting an efficient antibacterial activity. The obtained results are rigorously analysed and supported with relevant data. © The Author(s), under exclusive licence to springer Nature B.V. 2025.

关键词： X ray diffraction analysis

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A Probabilistic Fault Detection Approach for the management of Energy and Environment in Buildings Using BiGRU-sA Approach

A Probabilistic Fault Detection Approach for the Management ...

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2023 International Conference on self sustainable Artificial Intelligence systems, ICssAs 2023

作者： Rao, Ch. Venkateswara swaminathen, A.N. saikumari, N. Vyankatesh Ghamande, manasi Dahegaonkar, Ajay D. Kumar Gupta, Keerat University of Technology and Applied Sciences Electrical Section Engineering Dept Salalah Oman Adi Shankara Institute of Engineering and Technology Kerala India R.M.K. College of Engineering and Technology Department of Chemistry Tamilnadu Chennai India E and As Vishwakarma Institute of Information Technology Pune India N. S. Science & Arts College Department of Physics Chandrapur M.S. Bhadrawati India Graphic Era Deemed to Be University Department of Civil Engineering Uttarakhand Dehradun India

ISBN: (纸本)9798350300857

Over the next two decades, energy use in buildings is expected to increase by more than 40 percent. Already high electricity demand is anticipated to increase. Lessening the burden of the increased demand requires energy efficiency measures for buildings. Energy use in business buildings has increased due to space heating and other equipment, whereas residential building energy use has increased due to home appliances, water, and space heating. New and existing buildings, commercial and residential alike, can all benefit from the adoption of energy management systems to cut costs and carbon em.s.ions. To achieve maximum energy efficiency, several management strategies are required for various building types Energy and environment building is used to analyze the data taken in order to locate the source of the problem. The proposed technique has three stages: preprocessing, feature extraction, and model training, all of which occur after a data has been received. Among the preprocessing techniques used are PCA features. the feature will be employed once the preprocessing is complete. Feature extraction makes use of the mean, standard deviation, and maximum deviation. The package of tools used to measure performance is known as GRU, BiGRU, and BiGRU-sA. The proposed BiGRU-sA strategy performs quite well when compared to the other two established methods. © 2023 IEEE.

关键词： Housing

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Enhancing 3G ETA solar Cells with Novel Bi2se3 Nanoparticles synthesized on TiO2: Impact of Immersion Cycles on PEC Performance

SSRN

引用

ssRN 2024年

作者： Baviskar, Vijay s. Jadhav, Chandradip D. salunkhe, Deepak B. Narkhede, Narayan m. Patil, Girish P. Department of Applied Sciences and Humanities R. C. Patel Institute of Technology [Autonomous M.S. Shirpur425405 India Department of Physics Faculty of Natural Sciences Ariel University Ariel Israel Department of Physics KVPS Kisan Arts Commerce and Science College Parola425111 India

The fabrication of layer heterostructures through the incorporation of narrow band gap metal chalcogenide semiconductors onto metal oxide arrays represents a prom.s.ng strategy to enhance surface area, broaden optical response, and improve charge kinetics. These factors are of paramount importance in the performance of energy conversion devices. Here, we present a facile chemical route involving spin coating followed by successive Ionic Layer Adsorption and Reaction (sILAR) for the deposition of Bi2se3 nanoparticles onto TiO2 at room temperature. We systematically investigate the structural, optical, and surface morphological characteristics of the resulting TiO2/Bi2se3 heterostructure layer. Our findings demonstrate that the thin layer of Bi2se3 nanoparticles uniformly coats on to the porous TiO2 nanoparticles, leading to enhanced optical absorbance in the visible region. Furthermore, we assess the charge kinetics and performance of solar cell devices utilizing the fabricated heterostructure, employing an FTO/TiO2/Bi2se3/polysulfide/carbon-coated FTO sandwich-type device structure. Through comparative analysis, we evaluate the initial characterizations, charge kinetics, and photovoltaic performance of the TiO2/Bi2se3 heterostructure with varying sILAR cycles. Our results show a significant improvement in photocurrent for the bilayer architecture TiO2/Bi2se3 (0.55 mA/cm2) compared to bare TiO2 (0.041 mA/cm2). © 2024, The Authors. All rights reserved.

关键词： Bismuth compounds

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simple and low-cost Cu2sub>s/TiO2sub> architecture for 3G ETA solar cell: Fabrication, characterization and their performance

引用

Nano-structures and Nano-Objects 2022年 32卷

作者： Baviskar, Vijay s. salunkhe, Deepak B. Nikam, Chandrashekhar P. Narkhede, Narayan m. Jadhav, Chandradip D. Patil, Girish P. Patil, Rajendra s. Department of Applied Sciences and Humanities R.C. Patel Institute of Technology (Autonomous) M.S. Shirpur 425405 India Department of Physics KVPS Kisan Arts Commerce and Science College (M.S.) Parola 425111 India BBSPM's Arts Commerce and Science College (M.S.) Songir 424309 India Department of Physics Faculty of Natural Sciences Ariel University Ariel Israel Department of Physics PSGVPM's A.S.C. College M.S. Shahada 425409 India

The present work explores the unexposed Cu2s/TiO2 architecture for a 3rd generation (3G) extremely thin absorber (ETA) solar cell fabricated by simple and low-cost chemical routes at room temperature. The structural, ... 详细信息

The present work explores the unexposed Cu2sub>s/TiO2sub> architecture for a 3rdsup> generation (3G) extremely thin absorber (ETA) solar cell fabricated by simple and low-cost chemical routes at room temperature. The structural, optical, surface morphological and electron kinetic studies of the proposed architecture are systematically investigated. The results clearly establish that porous TiO2sub> is homogeneously decorated by tiny Cu2sub>s nanoparticles, boosting the optical absorbance in the visible range of the solar spectrum. moreover, we have successfully demonstrated the solar cell device grade performance of the Cu2sub>s/TiO2sub> architecture by constructing a sandwich type device structure. The photoconversion efficiency, as well as the charge transportation across the Cu2sub>s/TiO2sub> device, is remarkably impacted by tuning successive ionic layer adsorption and reaction (sILAR) cycles. Furthermore the research article briefly discusses a comparative analysis of all characterizations and the photovoltaic performance of the proposed Cu2sub>s/TiO2sub> architecture with respect to the sILAR cycles. © 2022 Elsevier B.V.

关键词： Chemical route Cu2s ETA solar cell Influence of sILAR cycles TiO2

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