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Your search keyword '"ABBAS, ZULKIFLY"' showing total 610 results
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610 results on '"ABBAS, ZULKIFLY"'

2. Fabrication and characterization of [Fe.sub.2][O.sub.3]-OPEFB-PTFE nanocomposites for microwave shielding applications

Author

Khamis, Ahmad Mamoun, Abbas, Zulkifly, Azis, Rabaah Syahidah, Mensah, Ebenezer Ekow, and Alhaji, Ibrahim Abubakar

Subjects
Nanoparticles -- Electric properties -- Magnetic properties -- Production processes -- Identification and classification -- Materials, Polytetrafluoroethylene -- Usage, Oil palm -- Usage, Iron oxides -- Usage, Technology application, Engineering and manufacturing industries, Science and technology
Abstract

Abstract The development of microwave shielding nanocomposites based on recycled hematite nanoparticles, oil palm empty fruit bunch (OPEFB), and polytetrafluoroethylene (PTFE) was the main focus of this study. The complex [...]

Published
2022
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5. Radiation and scattering by a multilayer uniaxial bianisotropic circular cylindrical scatterer.

Author

Ng, Tze Wei, Md Norimi, Amizadillah, Lim, Sim Bio, Ng, Tiong Lim, Abd Rahman, Mohd Amiruddin, Zainuddin, Mohamad Faiz, Esa, Fahmiruddin, You, Kok Yeow, Lee, Kim Yee, Cheng, Ee Meng, Jusoh, Mohamad Ashry, and Abbas, Zulkifly

Subjects
RADAR cross sections, ALGEBRAIC equations, ELECTROMAGNETIC radiation, ELECTROMAGNETIC wave scattering, LINEAR equations
Abstract

The eigenfunction solution of electromagnetic radiation and scattering from a multilayer uniaxial bianisotropic circular cylindrical scatterer is presented. The expressions for the electric and magnetic field equations are decomposed into transverse and longitudinal components. The boundary conditions are enforced by matching the transverse and axially directed fields at the interfaces between regions with different constitutive parameters. Matrices are constructed from the linear algebraic equations to solve the unknown series coefficients. On the one hand, numerical results are presented for the near zone fields and radar cross section in the two dimensional case. On the other hand, numerical solutions are presented for the radiation pattern when a dipole is present in the vicinity of the cylindrical scatterer in the three dimensional case. Results obtained using the eigenfunction series for the multilayer uniaxial bianisotropic circular cylindrical scatterer are in excellent agreement with results in existing literature and solutions computed using other formulations. [ABSTRACT FROM AUTHOR]

Published
2025
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27. Corrigendum to “In-situ preparation of CoFe2O4 nanoparticles on eggshell membrane-activated carbon for microwave absorption” [Heliyon 9 (3) (March 2023) Article e13256]

Author

Soleimani, Hassan, primary, Yusuf, Jemilat Yetunde, additional, Chuan, Lee Kean, additional, Soleimani, Hojjatollah, additional, Lutfi bin Sabar, Mustapha, additional, Öchsner, Andreas, additional, Abbas, Zulkifly, additional, Balogun, Asmau Iyabo, additional, and Kozlowski, Gregory, additional

Published
2023
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29. Fourth Order Approximation with Complexity Reduction Approach for the Solution of Time Domain Maxwell Equations in Free Space

Author

Hasan, Mohammad Khatim, Othman, Mohamed, Abbas, Zulkifly, Sulaiman, Jumat, Ahmad, Fatimah, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Gervasi, Osvaldo, editor, Taniar, David, editor, Murgante, Beniamino, editor, Laganà, Antonio, editor, Mun, Youngsong, editor, and Gavrilova, Marina L., editor

Published
2009
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30. Parallel Implementation of Complexity Reduction Approach to Fourth Order Approximation on 2D Free Space Wave Propagation

Author

Hasan, Mohammad Khatim, Othman, Mohamed, Abbas, Zulkifly, Sulaiman, Jumat, Ahmad, Fatimah, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Gervasi, Osvaldo, editor, Murgante, Beniamino, editor, Laganà, Antonio, editor, Taniar, David, editor, Mun, Youngsong, editor, and Gavrilova, Marina L., editor

Published
2008
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31. Parallel Solution of High Speed Low Order FDTD on 2D Free Space Wave Propagation

Author

Hasan, Mohammad Khatim, Othman, Mohamed, Abbas, Zulkifly, Sulaiman, Jumat, Ahmad, Fatimah, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Gervasi, Osvaldo, editor, and Gavrilova, Marina L., editor

Published
2007
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43. Structural, Electromagnetic and Microwave Properties of Magnetite Extracted from Mill Scale Waste via Conventional Ball Milling and Mechanical Alloying Techniques

Author

Elmahaishi, Madiha Fathi, primary, Azis, Raba’ah Syahidah, additional, Ismail, Ismayadi, additional, Mustaffa, Muhammad Syazwan, additional, Abbas, Zulkifly, additional, Matori, Khamirul Amin, additional, Muhammad, Farah Diana, additional, Saat, Nor Kamilah, additional, Nazlan, Rodziah, additional, Ibrahim, Idza Riati, additional, Abdullah, Nor Hapishah, additional, and Mokhtar, Nurhidayaty, additional

Published
2021
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47. Fabrication and characterization of Fe2O3‐OPEFB‐PTFE nanocomposites for microwave shielding applications.

Author

Khamis, Ahmad Mamoun, Abbas, Zulkifly, Azis, Raba'ah Syahidah, Mensah, Ebenezer Ekow, and Alhaji, Ibrahim Abubakar

Subjects
NANOCOMPOSITE materials, MICROWAVES, REFLECTANCE, FERRIC oxide, OIL palm, POLYTEF, HEMATITE
Abstract

The development of microwave shielding nanocomposites based on recycled hematite nanoparticles, oil palm empty fruit bunch (OPEFB), and polytetrafluoroethylene (PTFE) was the main focus of this study. The complex permeability (μ′–jμ″), complex permittivity (ε′–jε″), reflection coefficient (S11), and transmission coefficient (S21) were determined using rectangular waveguide (RWG) connected to a vector network analyzer (VNA) in the frequency range of 8.2–12.4 GHz. The power loss, reflection loss, and total shielding effectiveness (SE) were calculated using the scattering parameters obtained through RWG. The results showed that the nanocomposites' microwave shielding properties can be controlled by tuning the percentage of Fe2O3 nanofiller in the nanocomposites. The values of ε′, ε″, μ′, and μ″ were enhanced by increasing the content of the recycled Fe2O3 nanofiller in the nanocomposites. At 10 GHz, the power loss values obtained for the nanocomposites ranged between 8.52 and 15.64 dB, while at 12.4 GHz, a maximum value of 16.32 dB was achieved by 25 wt%. nanocomposite. The total SE also increased with increasing Fe2O3 loading and a maximum value of 21.2 dB was achieved by 25 wt% nanocomposite at 12.4 GHz. The Fe2O3‐OPEFB‐PTFE nanocomposites have the potential to be used in microwave shielding applications in the frequency range 8.2–12.4 GHz. [ABSTRACT FROM AUTHOR]

Published
2022
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49. Structural, electromagnetic and microwave properties of magnetite extracted from mill scales via conventional ball milling and mechanical alloying techniques

Author

Elmahaishi, Madiha Fathi, Azis, Raba’ah Syahidah, Ismail, Ismayadi, Mustaffa, Muhammad Syazwan, Abbas, Zulkifly, Matori, Khamirul Amin, Muhammad, Farah Diana, Saat, Nor Kamilah, Nazlan, Rodziah, Ibrahim, Idza Riati, Abdullah, Nor Hapishah, Mokhtar, Nurhidayaty, Elmahaishi, Madiha Fathi, Azis, Raba’ah Syahidah, Ismail, Ismayadi, Mustaffa, Muhammad Syazwan, Abbas, Zulkifly, Matori, Khamirul Amin, Muhammad, Farah Diana, Saat, Nor Kamilah, Nazlan, Rodziah, Ibrahim, Idza Riati, Abdullah, Nor Hapishah, and Mokhtar, Nurhidayaty

Abstract

This study presents the utilization of mill scale waste, which has attracted much attention due to its high content of magnetite (Fe3O4). This work focuses on the extraction of Fe3O4 from mill scale waste via magnetic separation, and ball milling was used to fabricate a microwave absorber. The extracted magnetic powder was ground-milled using two different techniques: (i) a conventional milling technique (CM) and (ii) mechanical alloying (MM) process. The Fe3O4/CM samples were prepared by a conventional milling process using steel pot ball milling, while the Fe3O4/MM samples were prepared using a high-energy ball milling (HEBM) method. The effect of milling time on the structural, phase composition, and electromagnetic properties were examined using X-ray diffraction (XRD) and a vector network analyzer (VNA). XRD confirmed the formation of magnetite after both the magnetic separation and milling processes. The results revealed that Fe3O4 exhibited excellent microwave absorption properties because of the synergistic characteristics of its dielectric and magnetic loss. The results showed that the Fe3O4/CM particle powder had a greater absorption power (reflection loss: <−10 dB) with 99.9% absorption, a minimum reflection loss of −30.83 dB, and an effective bandwidth of 2.30 GHz for 2 mm thick samples. The results revealed the Fe3O4/MM powders had higher absorption properties, including a higher RL of −20.59 dB and a broader bandwidth of 2.43 GHz at a matching thickness of only 1 mm. The higher microwave absorption performance was attributed to the better impedance matching property caused by the porous microstructure. Furthermore, the magnetite, Fe3O4 showed superior microwave absorption characteristics because of the lower value of permittivity, which resulted in better impedance matching. This study presents a low-cost approach method by reutilizing mill scale waste to fabricate a high purity crystalline Fe3O4 with the best potential for designing magnetic nano-size

Published
2021

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