Article
Physics, Applied
Xiangtian Xiao, Taikang Ye, Jiayun Sun, Xiangwei Qu, Zhenwei Ren, Dan Wu, Shihao Ding, Xiao Wei Sun, Wallace C. H. Choy, Kai Wang
Summary: A capacitance-voltage (C-V) model is established to describe carrier behaviors in perovskite light-emitting diodes (PeLEDs) and is used to guide the improvement of electroluminescence (EL) performance. High hole injection barrier and insufficient recombination are revealed and addressed by the design of a MoO3 interface layer, leading to an improved external quantum efficiency in the optimized PeLED.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Condensed Matter
Apurba Pal, J. N. Roy, P. Dey
Summary: This study investigates the effect of the interface on light and magnetic field dependent electrical transport through the Zn0.3Ni0.7Fe2O4/ZnO-rGO composite heterostructure using impedance spectroscopy and fitting analysis. The results show that under dark conditions, the change in resistance (R) may be controlled by magnetostriction and magnetic field assisted tunnelling, while the increase in capacitance (C) can be attributed to magnetoelectric coupling. Under strong illumination, a relaxation peak is observed, which may be attributed to light assisted relaxation at the composite interface.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Chemistry, Physical
Fang Luo, Yingjie Yu, Xue Long, Chen Li, Tiantian Xiong, Zehui Yang
Summary: In this study, rhodium phosphides were used as co-catalysts with platinum to enhance the methanol oxidation reaction in direct methanol fuel cells. The excellent water dissociation capability of rhodium phosphides and the electronic interplay between platinum and rhodium phosphides were found to play important roles in improving the performance of the catalyst.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2024)
Article
Nanoscience & Nanotechnology
Kyle P. Kelley, Vinit Sharma, Wenrui Zhang, Arthur P. Baddorf, Von B. Nascimento, Rama K. Vasudevan
Summary: The study reveals an unprecedented surface reconstruction in La₁-xSrₓMnO₃, indicating its potential for applications and the ability to tune surface ordering by controlling cation segregation.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Ceramics
Guangtan Miao, Nan Li, Peng Li, Jigong Hao, Wei Li, Juan Du, Weifang Han, Guorong Li, Chunming Wang, Peng Fu
Summary: YCr0.5Mn0.5O3(YCM)-CaCu3Ti4O12(CCTO) ceramics with pure perovskite structures were prepared using a solid processing method. The resistivity of the ceramics was found to be sensitive to grain size and grain size distribution. Additionally, the ceramics exhibited NTC characteristics.
CERAMICS INTERNATIONAL
(2022)
Article
Physics, Multidisciplinary
Debajit Deb, Debarati Nath, R. J. Choudhary, J. N. Roy, P. Dey
Summary: Carrier transport properties of a ZnO-rGO/La0.7Sr0.3MnO3(LSMO)/ITO heterostructure were investigated with respect to both red light and magnetic field dependence. The observed positive magnetoresistance behavior indicated larger spin dependent scattering of electrons in the LSMO depletion region. The device current was enhanced with light intensity in the positive bias region and zero applied magnetic field. However, a sudden decrease in device current was observed at higher constant applied magnetic field.
Article
Electrochemistry
K. Darowicki, A. Zielinski, M. Mielniczek, E. Janicka, L. Gawel
Summary: This paper presents a polynomial description of spectrograms obtained using Dynamic Electrochemical Impedance Spectroscopy, with an alternative analysis method discussed for determining system electrochemical characteristics. This method was compared to classical analysis based on equivalent circuit fitting, showing advantages in describing impedance results and controlling electrochemical energy sources.
ELECTROCHEMISTRY COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Agustin O. Alvarez, Sandheep Ravishankar, Francisco Fabregat-Santiago
Summary: Small-perturbation techniques such as IS, IMPS, and IMVS are useful tools for characterizing and modeling photovoltaic and photoelectrochemical devices. A unified theoretical framework and procedure to combine the spectral analysis of these techniques greatly reduce the sample space of possible equivalent circuits, allowing for parameters to be obtained with high reliability by considering absorptance and separation efficiency.
Article
Chemistry, Physical
Roby Soni, James B. Robinson, Paul R. Shearing, Dan J. L. Brett, Alexander J. E. Rettie, Thomas S. Miller
Summary: Electrochemical impedance spectroscopy (EIS) is widely used in battery analysis. However, the data interpretation in traditional analysis techniques is limited. This study demonstrates the use of distribution of relaxation times (DRT) analysis to provide quantitative deconvolution of EIS spectra from Li-S batteries, revealing the contributions of distinct electrode processes to the total cell polarisation.
ENERGY STORAGE MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
V. Maksymych, M. Klapchuk, A. Borysiuk, Yu. Kulyk, V. Stadnyk, I. Bordun, Z. Kohut, F. Ivashchyshyn
Summary: The paper studies the characteristics of SDM> clathrate and confirms the identity of its components using X-ray diffraction analysis. Vibration magnetometric analysis reveals iron oxidation in the ferrocene structure, forming ferromagnetic iron compounds. The study establishes the changes in impedance, dielectric constant, and dielectric loss tangent under different conditions, showing quantum capacitance, photo- and magneto-resistive inductance, capacitive effects, and magneto-induced quantum accumulation of electric energy. The I-V characteristics are oscillating in nature similar to Coulomb blockade, but they do not pass through the origin, fixing the thermoEMF, spin EMF, and photo-EMF.
MATERIALS RESEARCH BULLETIN
(2023)
Review
Chemistry, Analytical
Zhao Zhang, Xiaowen Huang, Ke Liu, Tiancong Lan, Zixin Wang, Zhen Zhu
Summary: Cellular heterogeneity is important in cell-based assays, and electrical impedance sensing technology allows for rapid, non-invasive acquisition of single cell electrical parameters. These parameters are closely related to cellular properties and activities, and devices such as impedance flow cytometry and electrical impedance spectroscopy are used for cell recognition, counting, viability detection, phenotypic assay, and other cell detection. Impedance sensing technology shows promise in single-cell analysis.
Article
Chemistry, Physical
A. Gasonoo, Y-J Lim, E-J Jang, J. Lee, M-H Kim, Y. Choi, J-H Lee
Summary: Investigation on the degradation mechanism of electrically aged organic p-n heterojunction charge generation layers reveals reduced charge generation and capacitance after aging. Analysis of UV-Vis-NIR spectra indicates decomposition of charge transfer complex. Electron transport is identified as the rate-limiting step in charge generation in the CGL.
MATERIALS TODAY ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Zijing Dong, Yongping Pu, Guodong Shen
Summary: A microwave sintering procedure was used to produce high-quality multiferroic composites. The results showed that BaFe12O19 particles were evenly isolated by BaTiO3 particles, and a significant magnetodielectric effect was observed at room temperature under a magnetic field, demonstrating its potential for applications.
Article
Chemistry, Physical
Shuang Song, Xiong Zhang, Yabin An, Tao Hu, Congkai Sun, Lei Wang, Chen Li, Xiaohu Zhang, Kai Wang, Zhichuan J. Xu, Xianzhong Sun, Yanwei Ma
Summary: This paper evaluates the lifetime of lithium-ion capacitors (LIC) by studying the floating aging mechanism under different voltages from both non-destructive and destructive perspectives. By conducting accelerated aging tests in high temperature climate chambers, with floating voltages set at 2.2, 3, and 3.8 V, the authors explore the aging mechanism using an impedance model with high fitting degree. Analysis is performed on brand-new and aged cells to verify the aging mechanism predicted by the impedance model. The findings show that the degradation behavior varies with different floating voltages, and medium voltage region performs well in calendar aging, contributing to the reliability of LIC storage. Recommendations are provided for non-destructive methods, which can benefit future lifespan research using impedance models.
JOURNAL OF POWER SOURCES
(2023)
Article
Engineering, Electrical & Electronic
Y. V. Gomeniuk, Y. Y. Gomeniuk, S. V. Kondratenko, T. E. Rudenko, A. V. Vasin, A. V. Rusavsky, O. M. Slobodian, I. P. Tyagulskyy, V. P. Kostylyov, V. M. Vlasiuk, S. I. Tiagulskyi, R. Yatskiv, V. S. Lysenko, A. N. Nazarov
Summary: The electrical and photoelectrical properties of n(+)-ZnO/n-Si and PEDOT:PSS/n(+)-ZnO/n-Si heterostructures were studied. The deposition of PEDOT:PSS layer on the surface of zinc oxide increased the potential barrier at the ZnO/Si interface, resulting in higher band bending in the silicon, which is crucial for solar cell applications. The recombination rate at the interface decreased due to the formation of an inversion layer in the silicon under operational conditions. The potential barrier increase in PEDOT:PSS/n(+)-ZnO/n-Si heterostructures led to a 54-180% increase in open-circuit voltage, and a 100% increase in external quantum efficiency at 450 nm.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Construction & Building Technology
Jayvant Choudhary, Brind Kumar, Ankit Gupta
Summary: The nature and quantity of filler have a significant impact on the ageing susceptibility of asphalt mixes, as evidenced by changes in TSR, CL, MQ, and MS. For asphalt mixes corresponding to their ITS values, the amount of filler appears to be the key factor influencing their ageing susceptibility. The ageing susceptibility of asphalt concrete mixes is greatly influenced by their apparent film thicknesses.
INTERNATIONAL JOURNAL OF PAVEMENT ENGINEERING
(2022)
Article
Chemistry, Physical
Pooja Shandilya, Rohit Sharma, Raj Kumar Arya, Amit Kumar, Dai-Viet N. Vo, Gaurav Sharma
Summary: The global energy demand is steadily increasing and requires a reliable and sustainable source of energy. Hydrogen energy is emerging as one of the most promising alternatives, with a zero-carbon footprint. Layered double hydroxides (LDH) nanocomposites have attractive physicochemical properties and synergistic effect in the field of hydrogen production.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Thermodynamics
Anwar Zeb, Sunil Kumar, Almaz Tesfay, Anil Kumar
Summary: This study investigates the dynamics of smoking models using stochastic methods, discussing the existence and uniqueness of non-negative global solutions, and presenting sufficient conditions for smoking extinction. The research provides insights for controlling smoking globally and proposes new mathematical models for the smoking epidemic in the form of fractional stochastic modeling in the future.
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
(2022)
Article
Engineering, Multidisciplinary
Subhi Tyagi, Nupur Goyal, Akshay Kumar, Mangey Ram
Summary: This study discusses the reliability quality attributes of an independent PV/wind hybrid energy system using Markov method. The system has three states and various reliability indices such as reliability, availability, and mean time to failure are evaluated. The results are beneficial for engineers, designers, researchers, and students in different fields.
INTERNATIONAL JOURNAL OF SYSTEM ASSURANCE ENGINEERING AND MANAGEMENT
(2022)
Article
Management
Debashree Das, Avik Datta, Patanjal Kumar, Yigit Kazancoglu, Mangey Ram
Summary: The COVID-19 pandemic has significantly disrupted global supply chain networks. This study identified critical factors affecting the supply chain and found that cost optimization and government support are important in reducing vulnerabilities. By using multi-criteria decision methods, the study analyzed relationships among factors to develop a risk-resilient framework for the supply chain network.
OPERATIONS MANAGEMENT RESEARCH
(2022)
Article
Mathematics, Applied
Sunil Kumar, Ram P. Chauhan, Mohamed S. Osman, S. A. Mohiuddine
Summary: The main aim of this work is to numerically investigate a mathematical model of the HIV/AIDS disease with awareness effect. The study extends the integer-order model to fractional order using the generalized Caputo fractional derivative. A fixed-point approach is utilized to prove the existence and uniqueness of the model. The fractional-order HIV/AIDS transmission model is then solved using a new numerical technique based on the Adams-Bashforth predictor-corrector method, and the results are illustrated through graphs.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2023)
Article
Engineering, Chemical
Shweta Sharma, Gaurav Sharma, Amit Kumar, Pooja Dhiman, Tahani Saad AlGarni, Mu Naushad, Zeid A. ALOthman, Florian J. Stadler
Summary: The present study successfully designed a novel porous Zn/Fe LDH adsorbent using a combination of co-precipitation, hydrothermal, and thermal treatment methods. Intercalating H2O2 into LDH followed by thermal treatment created pores in the LDH layers, leading to increased surface area. The synthesized adsorbent showed a high adsorption capacity for the antibiotic ciprofloxacin, following Freundlich isotherm model and pseudo-second-order kinetic model, with C pi-metal interactions, hydrogen bonding, and electrostatic interactions playing major roles.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Sunil Kumar, R. P. Chauhan, Abdel-Haleem Abdel-Aty, Sayed F. Abdelwahab
Summary: Cancer is a global health challenge, affecting millions of people worldwide. This article computationally examines the dynamics of the tumour-immune-vitamins (TIV) system, specifically looking at the impact of vitamin intervention on enhancing the immune system and its effects on tumour cell production and division. Different fractional approaches and numerical methods are used to analyze and present the results graphically.
RESULTS IN PHYSICS
(2022)
Article
Business
Kanwal Anil, Anil Misra
Summary: This original research explores the evolving role of artificial intelligence (AI) in the Indian peer-to-peer lending (P2P) markets. It uses a unique research design and multiple case study approach to examine the penetration of AI in the Indian P2P market and its future prospects.
INTERNATIONAL JOURNAL OF EMERGING MARKETS
(2022)
Article
Engineering, Multidisciplinary
Shwetank Avikal, Mukesh Nigam, Mangey Ram
Summary: ERP projects are risky and companies are hiring external consultants for successful implementation. This article proposes a hybrid approach of F-AHP and COPRAS-G for selection of ERP consultants, illustrated with data from Indian industries.
INTERNATIONAL JOURNAL OF SYSTEM ASSURANCE ENGINEERING AND MANAGEMENT
(2022)
Article
Computer Science, Theory & Methods
Rachid Belgacem, Ahmed Bokhari, Salih Djilali, Sunil Kumar
Summary: This research investigates the numerical inversion technique for Laplace transforms using the integration Boubaker polynomials operational matrix. It demonstrates the efficiency of the approach by solving differential equations and combines this technique with the standard Laplace Homotopy Perturbation Method. The numerical results highlight a strong agreement between the estimated solutions and exact solutions.
INTERNATIONAL JOURNAL OF MODELING SIMULATION AND SCIENTIFIC COMPUTING
(2022)
Article
Computer Science, Artificial Intelligence
Tanveen Kaur Bhatia, Amit Kumar, Mahesh Kumar Sharma
Summary: The author points out the mathematical incorrect assumptions made in existing approaches and proposes a new approach named Mehar approach to solve fully fuzzy linear fractional transportation problems. An exact fuzzy optimal solution of an existing problem is obtained using the proposed Mehar approach.
Article
Engineering, Environmental
Gaurav Sharma, Amit Kumar, P. Senthil Kumar, Abdullah Alodhayb, Zeid A. ALOthman, Pooja Dhiman, Florian J. Stadler
Summary: A highly visible-light active nanocomposite was designed and tested for the degradation of toxic pharmaceutical effluents in water. The addition of carbon quantum dots enhanced the light-harvesting ability and successfully degraded ofloxacin antibiotic. The study also established a degradation mechanism and identified the major reactive radical species involved.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Mathematics, Interdisciplinary Applications
Khushbu Agrawal, Ranbir Kumar, Sunil Kumar, Samir Hadid, Shaher Momani
Summary: This paper proposes a model to explain the stability of the glucose-insulin regulatory system. Numerical investigations using fractional-order analysis methods demonstrate the effectiveness and applicability of this approach. The findings are important for gaining a deeper understanding of the regulatory system.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Environmental Sciences
Gaurav Sharma, Amit Kumar, Shweta Sharma, Mu Naushad, Dai-Viet N. Vo, Mohd Ubaidullah, Sabry M. Shaheen, Florian J. Stadler
Summary: In this study, a highly efficient photocatalyst, g-C3N4/BiOCl@MXene-Ti3C2 (GCBM), was successfully synthesized for the degradation of antibiotic tetracycline. The photocatalyst showed excellent activity in the visible region, achieving a significant degradation rate of tetracycline. The synthesized heterojunction exhibited high absorption across the complete spectrum, with reactive species mainly involving O-center dot(2)- and (OH)-O-center dot radicals.
ENVIRONMENTAL POLLUTION
(2022)
