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All Journal International Journal of Evaluation and Research in Education (IJERE) Journal of Material Science and Radiation
Muhammad Khalis Abdul Karim
Universiti Putra Malaysia
Education Materials Science & Nanotechnology Physics

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Evaluation of healthcare science student learning styles based VARK analysis technique Izdihar Kamal; Muhammad Khalis Abdul Karim; Mohd Mustafa Awang Kechik; Xinni Ni; Hairil Rashmizal Abdul Razak
International Journal of Evaluation and Research in Education (IJERE) Vol 10, No 1: March 2021
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijere.v10i1.20718

Abstract

This study aimed to evaluate the learning styles among healthcare students and to study the relationship with their academic achievement. This cross-sectional study was conducted among 137 healthcare students from six different courses. Data was collected using a self-administered questionnaire and developed based on the original visual, aural/auditory, read/write, and kinesthetic (VARK) assessment. The questionnaire was divided into two sections: the demographic status and the learning style perspective. A total of 119 respondents (86.8%) has chosen unimodal as their learning styles, while the rest of the 18 respondents (13.2%) choose multimodal as their preferred learning method. Among the unimodal learning styles, visual (32%) and reading (26%) were most preferred among respondents. The auditory and kinesthetic methods of learning were less and accounted for 10% to 20%. Notably, in multimodal learning styles preferences, 4% of students prefer a combination learning style of visual and kinesthetic methods. There was no significant relationship between learning styles and academic achievement using Pearson’s Chi-square test (p>0.05). Hence, both were independent of one another. Hence, some of the dominant learning styles needed to be considered based on their future profession.
Influence of Sintering Temperature on Phase Formation and Superconducting Properties of Bi2Sr2CaCu2O8+δ via Thermal Treatment Method Rahayu Emilia Mohamed Khaidir; Aliah Nursyahirah Kamarudin; Mohd Mustafa Awang Kechik; Chen Soo Kien; Lim Kean Pah; Muhammad Kashfi Shabdin; Muhammad Khalis Abdul Karim; Aris Doyan; Abdul Halim Shaari
Journal of Material Science and Radiation Vol. 1 No. 1 (2025): April
Publisher : Balai Publikasi Indonesia

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Abstract

High-temperature superconductor Bi2Sr2CaCu2O8+δ (Bi-2212) was successfully prepared using a thermal treatment method, starting with nitrate-based precursors. This study focused on how different sintering temperatures affect the material’s critical temperature, Tc. The process began with a pre-calcination step at 600 °C for 12 hours, followed by calcination at 820 °C for 24 hours. After that, the powder was pressed into pellets and sintered at 830 °C, 840 °C, 850 °C, and 860 °C, each for 24 hours. The Tc-onset values increased with sintering temperature, reaching 50 K at 830 °C, 65 K at 840 °C, and 78 K at 850 °C. SEM images showed closely packed, flake-like grains around 2 μm in size, while XRD analysis confirmed that the sample sintered at 850 °C had the highest Bi-2212 phases as a major phase. Thus, this work outlines the practical steps of the thermal treatment approach and shows how adjusting the sintering temperature can significantly influence the superconducting performance and phase formation of Bi-2212
Safety Evaluation of MRI Magnetic Field Leakage from Different Configurations Yap Siew Hong; Siti Aisyah Mohd Nordin; Mohd Mustafa Awang Kechik; Muhammad Khalis Abdul Karim; Zarina Ramli; Hussien Baqjiah; Soo Kien Chen; Kean Pah Lim; Muhammad Kashfi Shabdin; Aliah Nursyahirah Kamarudin; Aris Doyan; Arebat Ryad Alhadei Mohamed; Abdul Halim Shaari
Journal of Material Science and Radiation Vol. 1 No. 1 (2025): April
Publisher : Balai Publikasi Indonesia

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Abstract

Magnetic Resonance Imaging (MRI) systems generate intense static magnetic fields (SMFs), with fringe field propagation varying considerably between installations, even among scanners that operate at the same nominal field strength. This study investigates the safety implications of magnetic field leakage by quantifying and comparing SMFs distributions surrounding multiple MRI facilities. The assessment covers 1.5 T MRI scanners at Hospital Canselor Tuanku Muhriz (HCTM) and Hospital Pakar Kanak-Kanak UKM (HPKK), and 3 T scanners at the National Cancer Institute / Institut Kanser Negara (IKN), Pusat Pengimejan Diagnostik Nuklear (PPDN), and HCTM. Magnetic field intensities were recorded using a Magnetometer HP-01 provided by the Medical Radiation Surveillance Division (BKRP), Ministry of Health Malaysia, and visualised using MATLAB to model spatial field dispersion. Statistical tools, including Box and Whisker plots and the Shapiro-Wilk test, were employed to analyse magnetic field uniformity and containment. Specifically, 1.5 T scanners at HCTM and HPKK, and 3.0 T scanners at IKN, PPDN, and HCTM, each displayed distinct SMFs propagation profiles. These findings align with earlier studies conducted in Italy, confirming that magnetic field distributions near the magnet core can differ substantially based on scanner model and site-specific installation variables—even when B₀ remains constant. Notably, HCTM exhibited superior SMFs confinement, with lower standard deviation and a narrower distribution range, suggesting better shielding design. This enhances occupational safety in zones where radiographers frequently operate. The results reinforce the need for site-specific SMFs assessments and optimised shielding practices to maintain safe MRI environments for both staff and patients
Effect of SnO2 Addition on YBCO Superconducting Properties through Thermal Treatment Method Aliah Nursyahirah Kamarudin; Tan Kar Yeow; Mohd Mustafa Awang Kechik; Chen Soo Kien; Lim Kean Pah; Muhammad Kashfi Shabdin; Nurhidayah Mohd Hapipi; Muhammad Khalis Abdul Karim; Aris Doyan; Yap Siew Hong; Abdul Halim Shaari
Journal of Material Science and Radiation Vol. 1 No. 1 (2025): April
Publisher : Balai Publikasi Indonesia

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Abstract

In this study, YBa2Cu3O7-δ (YBCO) superconductors were synthesized using a thermal treatment method with the addition of 1.0 wt. % SnO₂. The synthesis of YBCO employed nitrate-based precursors and polyvinylpyrrolidone (PVP) as a capping agent to enhance homogeneity during the synthesis process. All samples were characterized using thermogravimetric analysis (TGA), X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Four-point probe (4PP). TGA results of the pure YBCO sample confirmed the complete transformation of nitrate-based precursors into oxide forms prior to the formation of the YBCO phase. XRD pattern revealed that Y123 as a major phase and Y124 as a minor phase in all samples with orthorhombic crystal structure were preserved. However, the peak intensity of the Y123 was pronounced with the addition of the SnO2 sample, suggesting the enhancement phase formation due to the presence of SnO₂. The electrical resistivity measures revealed a sharp superconducting transition in all samples. However, the reduction in superconducting transition temperatures for the SnO2 addition were observed where the Tc-onset decreased from 91.70 K to 89.25 K for the YBCO and YBCO + 1.0 wt.% of SnO2, respectively. This also exhibited the broadening of transition width, ΔTc indicating the suppression of superconducting properties with SnO₂ inclusion. SEM analysis showed notable differences in microstructure. The pure YBCO sample exhibited a larger average grain size of 1.32 µm, while the YBCO + 1.0 wt. % SnO2 sample formed small and rounded grains with smoother edges, potentially impacting intergranular connectivity and charge transport. Therefore, the addition of 1.0 wt. % SnO2 to YBCO enhanced the formation of the Y123 phase but adversely affected the superconducting transition temperature and microstructural features. These findings highlight the dual role of SnO2 in promoting phase purity while modifying grain morphology and electrical performance, offering insight into the optimization of dopants in high-temperature superconductors
Comparative Characterisation of Structural and Superconducting Properties of Y-123 and Y-247 Synthesised by Thermal Treatment at 980 °C Siew Hong Yap; Tai Pao Er; Mohd Mustafa Awang Kechik; Muhammad Khalis Abdul Karim; Hussien Baqiah; Soo Kien Chen; Kean Pah Lim; Muhammad Kashfi Shabdin; Nurhidayah Mohd Hapipi; Aliah Nursyahirah Kamarudin; Arebat Ryad Alhadei Mohamed; Aris Doyan; Abdul Halim Shaari
Journal of Material Science and Radiation Vol. 1 No. 3 (2025): December
Publisher : Balai Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56566/jmsr.v1i3.425

Abstract

This study presents a comparative analysis of the structural and superconducting properties of YBa₂Cu₃O₇−δ (Y-123) and Y₂Ba₄Cu₇O₁₅−δ (Y-247) superconductors synthesised via a thermal treatment method at 980 °C. Metal nitrates were used as starting precursors, with polyvinylpyrrolidone (PVP) serving as a capping agent to enhance dispersion and control microstructure. X-ray diffraction (XRD) confirmed that Y-123 and Y-247 were the dominant phases in their respective samples, although minor peaks of BaCuO₂ were detected, indicating the presence of secondary phases. Scanning electron microscopy (SEM) revealed that Y-247 exhibited larger grain morphology and higher porosity than Y-123, suggesting that the chosen sintering temperature exceeds the thermal stability range for the Y-247 phase. Electrical resistivity measurements showed a single superconducting transition for both samples, with Y-123 exhibiting a sharper transition width (ΔTc = 8.1 K) compared to Y-247, indicating better grain connectivity and phase uniformity. Energy dispersive X-ray spectroscopy (EDX) supported the elemental presence of Y, Ba, Cu, and O in both samples, though variations in stoichiometry were attributed to secondary phases. The observed expansion in the c-axis lattice of Y-247, combined with its higher porosity, points to oxygen loss during sintering, which contributes to the reduced superconducting performance. Overall, the results confirm that both Y-123 and Y-247 can be successfully synthesised using a simple and environmentally friendly thermal treatment method. However, Y-123 exhibits better structural integrity and superconducting performance at the high sintering temperature of 980 °C, making it a more promising candidate for large-scale production of bulk high-temperature superconductors.
Co-Authors Abdul Halim Shaari Aliah Nursyahirah Kamarudin Arebat Ryad Alhadei Mohamed Aris Doyan Chen Soo Kien Hairil Rashmizal Abdul Razak Hussien Baqiah Hussien Baqjiah Izdihar Kamal Kean Pah Lim Lim Kean Pah Mohd Mustafa Awang Kechik Mohd Mustafa Awang Kechik Muhammad Kashfi Shabdin Muhammad Kashfi Shabdin Nurhidayah Mohd Hapipi Rahayu Emilia Mohamed Khaidir Siew Hong Yap Siti Aisyah Mohd Nordin Soo Kien Chen Tai Pao Er Tan Kar Yeow Xinni Ni Yap Siew Hong Zarina Ramli