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- 저자 : Matori, K.A. (검색결과 3 건)
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Zaid, M.H.M.,Matori, K.A.,Sidek, H.A.A.,Ibrahim, I.R. Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.4
This work reported the radiation shielding characteristic of the bismuth titanium vanadium sodium tellurite glass system. The density of the specially-developed glass samples was increased from 2.21 to 4.01 g/cm<sup>3</sup> with the addition of Bi<sub>2</sub>O<sub>3</sub>, despite the fact the molar volume is decease within 85.43-54.79 cm<sup>3</sup>/mol. The WinXcom program was used to approximate the effect of Bi<sub>2</sub>O<sub>3</sub> on the gamma radiation shielding parameters of bismuth titanium vanadium sodium tellurite glasses. The ㎛ values decrease with the increase of Bi<sub>2</sub>O<sub>3</sub> concentration. The computed data shows that the glass sample with 20 mol.% of Bi<sub>2</sub>O<sub>3</sub> content has the greatest radiation attenuation performance in comparison to other selected glasses. The Bi<sub>2</sub>O<sub>3</sub>-TiO<sub>2</sub>-V<sub>2</sub>O<sub>5</sub>-Na<sub>2</sub>O-TeO<sub>2</sub> glass system shows excellent neutron shielding material with high long-term light transmittance and discharge resistance and could be potentially used as transparent radiation-resistant shielding glass applications.
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Controlling the Properties of OPEFB/PLA Polymer Composite by Using Fe2O3 for Microwave Applications
Daw Mohammad Abdalhadi,Zulkifly Abbas,Ahmad Fahad Ahmad,Khamirul Amin Matori,Fahmiruddin Esa 한국섬유공학회 2018 Fibers and polymers Vol.19 No.7
Microwave-absorptive polymer composite materials provide protection against interference to communication systems caused by microwave-inducing devices. Microwave-absorptive polymer composites were prepared from polylactic acid (PLA) biocomposite blended with oil palm empty fruit bunch (OPEFB) fiber and commercial Iron oxide (Fe2O3) as filler using the melt-blending method. The composites characterization was carried out using the scanning electron microscopy (SEM) and X-ray diffraction (XRD) analyses. The coefficient of reflection S11 and coefficient of transmission S21 of the composites for various Fe2O3 filler percentages were determined using a rectangular waveguide in connection with microwave vector network analyser (HP/Agilent model PNA N5227). These coefficients were then used to calculate microwave-absorption properties (in decibels). XRD analysis showed that increasing amounts of reinforced material (Fe2O3) reduces the crystallinity of the composites. SEM data indicated that Fe2O3 filler ratio increased in the composites, and adhesion to the cellulose fiber grew gradually until the highest percentage of filler was added. The complex relative permittivity and relative permeability were obtained within the broad frequency range of 8-12 GHz at room temperature for various percentages of filler and were measured by the transmission/reflection method using a vector network analyser. Fe2O3 embedment in OPEFB/PLA was observed to have resulted in enhancing the dielectric and magnetic properties. The values of permittivity and permeability increased with increasing Fe2O3 filler content. Theoretical simulation studied the relation between ε' and ε" of the relative complex permittivity in terms of Cole-Cole dispersion law. The result indicated that the processes of Debye relaxation in Fe2O3/OPEFB/PLA, the unique dielectric characteristics of Fe2O3 cannot be accounted for by both the Debye dipolar relaxation and natural resonance. Results further showed that the material transmission, reflection, and absorption properties could be controlled by changing the percentage of Fe2O3 filler in the composites.
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Studies of structural and electrical properties of La-Mg-Mn-Ti-O ceramic
Siti Hashimah bt Mohamad Hanif,Walter Charles Primus,Khamirul Amin Matori,Josephine Liew Ying Chyi,Aaliyawani Ezzerin Sinin 한양대학교 청정에너지연구소 2023 Journal of Ceramic Processing Research Vol.24 No.3
The samples with chemical formula La1-xMgxMn0.4Ti0.6O3 (x = 0.30, 0.40 and 0.50) were synthesized using solid-state reactionmethod. XRD of the samples shown the samples pattern attributed to the cubic structure with ‘a’ = 3.8943 and its space groupPm3m. The SEM images display microstructure of the sample were porous and the grains are merged with unequal sizesdistributed inhomogeously throughout the samples with irregular boundaries. The sample of x = 0.4 was the most porous thanthe others. The electrical properties were measured using LCR meter with the frequency range from 0.01 Hz until 100 KHzand in a temperature range of 313 K until 373 K. The electrical properties of the samples were study by analyzed the dielectricconstant, ε’, dielectric loss, ε”, and tan δ. The results for dielectric constant and dielectric loss showed the higher values werelocated at lower frequency region which suggest that the samples were having interfacial polarization. Tan δ shows the lowervalue at higher frequency and lower temperature. By doping Mg, it decreases the dielectric loss and increasing the Mg dopingit increases the dielectric constant.
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