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22 results on '"Fabian Ezema"'

1. Enhanced electrochemical property of SILAR-deposited Mn3O4 thin films decorated on graphene

Author

Agnes C. Nkele, Ugochi Chime, Blessing Ezealigo, Assumpta Nwanya, AdaN.C. Agbogu, Azubike B.C. Ekwealor, Rose U. Osuji, Paul M. Ejikeme, Malik Maaza, and Fabian Ezema

Subjects
Manganese oxide, Thin films, Doping, Band gap, Cyclic voltammograms, Specific capacitance, Mining engineering. Metallurgy, TN1-997
Abstract

Manganese oxide and manganese oxide decorated on graphene thin films were successfully synthesized and decorated on graphene via successive ionic layer adsorption and reaction (SILAR) method. The morphological, elemental, structural, optical and electrochemical properties of the deposited films were respectively studied using scanning electron microscopy (SEM), energy dispersive x-ray spectroscopy (EDX, or EDS), X-ray diffractometry (XRD), UV–vis spectrophotometry and a 3-electrode potentiostat. Decorating the manganese oxide film on graphene improved the morphological, structural, optical, and electrochemical features of the deposited films. SEM image revealed irregularly fused capsule-like nanoparticles, EDX spectra confirmed the elemental composition of the films while the structure of the film improved from amorphous to crystalline after decorating on graphene. Optical results showed improved the transmittance and optical band gap values of the films upon decoration on the graphene. Electrochemical studies showed good cyclic voltammograms and a recorded maximum specific capacitance value of 194 F g−1. The films find potential application in electrochemical storage devices and optical devices.

Published
2020
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2. Formulating a Novel Physical Equation to Quantify Interocular Visual Acuity Influence

Author

Slimani Hamza, Sawsan Dagher, Noureddine Bessous, Ali Hilal-Alnaqbi, and Fabian Ezema

Abstract

The limitation of conventional visual acuity assessment, which primarily focuses on individual eye performance (monocular visual acuity tests). This study addresses this limitation by emphasizing the importance of binocular vision, where both eyes work together. Binocular vision provides numerous advantages, such as improved depth perception, a wider field of view, reduced visual fatigue, and binocular summation. The article introduces a new mathematical model based on the physics of constructive interference in light waves and the anatomy of visual nerves. This model yields an equation that quantifies how weakness in one eye affects the visual acuity of the other. By analyzing the correlation between the rates of visual weakness in each eye and the corresponding distances, utilizing the Snellen 6-meter test, valuable insights are gained into the complex interplay between eye deficiencies and their collective impact on overall visual acuity. The equations derived from this study can have significant implications for eye care professionals, clinicians, and patients, contributing to a more comprehensive understanding of visual impairments and enriching the field of optics and vision science.

Published
2024
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13. Preface

Author

Rajan Jose and Fabian Ezema

Published
2023

15. Module-level direct coupling in PV-battery power unit under realistic irradiance and load

Author

Uchechi Chibuko, Tsvetelina Merdzhanova, Daniel Weigand, Fabian Ezema, Solomon Agbo, Uwe Rau, and Oleksandr Astakhov

Subjects
Renewable Energy, Sustainability and the Environment, General Materials Science, ddc:530
Abstract

Solar energy 249, 233-241 (2023). doi:10.1016/j.solener.2022.11.040, Published by Elsevier Science, Amsterdam [u.a.]

Published
2023

19. Contributors

Author

Kenneth K. Agwu, Ishaq Ahmad, Victor Sunday Aigbodion, Samson O. Aisida, Yuksel Akinay, A. Ayeshaamriam, Lucas Barbosa, Debosreeta Bose, Katia Conceição, Erenilda F. de Macedo, Shoroshi Dey, Calister N. Eze, Blessing N. Ezealigo, Fabian Ezema, Sabastine C. Ezike, Sabastine Ezugwu, D. Gopi, Midhun Harilal, Carolina R. Hurtado, Innocent Sunday Ike, Patrick O. Ike, Chinedu Iroegbu, Anejo Itodo, David C. Iwueke, Priyanka Jagadish, A.R. Mohamed Jahangir, L. Kavitha, K. Kaviyarasu, Syam G. Krishnan, M. Maaza, Jayanta Mukhopadhyay, Madhumita Mukhopadhyay, Agnes C. Nkele, Paul S. Nnamchi, Paul Sunday Nnamchi, Hope E. Nsude, Kingsley U. Nsude, Assumpta C. Nwanya, O.A. Nwoke, Camillus S. Obayi, Camillus Sunday Obayi, Bridget Chizobam N. Obitte, Nicholas Chinedu Obitte, Raphael M. Obodo, Izunna S. Okeke, Luciane D. Oliveira, Rodrigo L.M.S. Oliveira, A.D. Omah, Edwin U Onah, Martina P. Orji, N. Punithavelan, Lucas de P. Ramos, S. Ramya, M. Ramzan, D. Saravanakkumar, M.I. Shahzad, Abhijit Das Sharma, E. Shinyjoy, S. Sutha, Dayane B. Tada, Eliandra de S. Trichês, Mrumun David Tyona, Anyaegbunam A. Ubachukwu, Paulinus E. Ugwuoke, Chika Oliver Ujah, U.O. Uyor, and G.M. Whyte

Published
2023

20. Robust Half-Metallic Character In KMnGe Half-Heusler Compound

Author

Timothy Chibueze and Fabian Ezema

Abstract

The search for spin injectors and spin sources in spintronic devices is a significant facet of materials research today. Consequently, half-Heusler (HAH) KMnGe alloy has been recommended as one such admissible materials. Herein, a rigorous examination of the structural, magnetic and electronic properties of HAH KMnGe alloy is done using ab initio method within the bolstered up rendition of the functional by Perdew and his group. Our result shows that HAH KmnGe alloy expresses type-1 and type-2 HAH structural ground state at high and low pressures respectively, which may pose a challenge in application. Impressively, HAH KMnGe alloy exhibits half metallic characteristic with an indirect energy gap in the Γ-X symmetry k-point and direct band gap at X-point in the minority electronic spin states for type-1 and type-2 phase respectively. Our findings agree fundamentally with some previous findings in the literature and suggests that the HAH KMnGe alloy is a credible excellent spin source in future spintronic devices.

Published
2021

21. Recent Advances in Materials for Supercapacitors

Author

Agnes C. Nkele, Raphael M. Obodo, Chinedu P. Chime, Assumpta C. Nwanya, C Iroegbu, M. Maaza, and Fabian Ezema

Subjects
Microbiology (medical), Linguistics and Language, Visual Arts and Performing Arts, Endocrinology, Diabetes and Metabolism, Public Health, Environmental and Occupational Health, Experimental and Cognitive Psychology, General Medicine, Aquatic Science, Microbiology, Urban Studies, Psychiatry and Mental health, Behavioral Neuroscience, Clinical Psychology, Endocrinology, Physiology (medical), Architecture, Developmental and Educational Psychology, Pharmacology (medical), Orthopedics and Sports Medicine, Cardiology and Cardiovascular Medicine, General Environmental Science
Abstract

The fluctuating availability of energy sources has encouraged the development of energy storage devices such as supercapacitors. Supercapacitors are good electrochemical energy storage materials that have demonstrated promising efficiencies in diverse applications. They are able to release high power at low energy operating conditions. In this article, we introduce basic knowledge on supercapacitors, their different classifications, and their relevance to material development. We outline the progress made on diverse materials adopted in improving the performance, charge retention, and stability of supercapacitive materials. Finally, we discuss the different methods utilised in obtaining highly stable supercapacitors.

Published
2022

22. Surface Modification and Functionalization of Ceramic Composites

Author

Rajan Jose, Fabian Ezema, Rajan Jose, and Fabian Ezema

Abstract

Surface Modification and Functionalization of Ceramic Composites is intended for both experts and beginners, allowing them to have an extended overview of recent progress in the evolution of surface modification methods and functionalization for ceramic composites. The book provides a detailed summary of the various techniques that are currently available, along with an evaluation of the costs involved. Information on the relationship between surface properties and function is also discussed. There is also an additional section on commercial and industrial applications, including biomedical, sensing and energy. The book will be a valuable reference resource for researchers and an instructive and stimulating text for postgraduate students who want to enhance their knowledge on novel materials and surface modification and functionalization of ceramic composites. - Extensively covers surface modification and functionalization of ceramic composites - A detailed review of the various techniques currently available and an evaluation of costs - Covers recent advances and a broad range of different industrial applications

Published
2023

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