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All Journal International Journal of Evaluation and Research in Education (IJERE) AMPLITUDO: Journal of Science & Technology Innovation Journal of Material Science and Radiation
Mohd Mustafa Awang Kechik
Universiti Putra Malaysia
Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture 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.
A Comparative Study of Gadobutrol Relaxivity at 3 Tesla for Sustainable Contrast Management and Standardized Phantom Calibration Maheran Che Ha’; Izdihar Kamal; Mohd Mustafa Awang Kechik; Khairil Amir Sayuti; Yusri Mohammed; Muhammad Khalis Abdul Karim; Aris Doyan
AMPLITUDO : Journal of Science and Technology Innovation Vol. 5 No. 1 (2026): February
Publisher : Balai Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56566/amplitudo.v5i1.527

Abstract

This study aimed to characterize the relaxivity profiles of pure agarose and gadobutrol in 1% (w/v) agarose under two experimental conditions (within the air and tap-water immersion). T1 and T2 values were quantified at 3 Tesla, Siemens, Vida scanner using inversion recovery turbo spin echo (IR-TSE) for T1 and multi-echo turbo spin echo (ME-TSE) for T2. Different concentration of agarose (0.2 – 4.0% w/v) and gadobutrol (0.5 – 6.0 mM) and their T1 and T2 value for each concentration were measured. Pure agarose demonstrated low longitudinal relaxivity (r1 » 0.04 - 0.05 s-1.(%w/v)-1 vs. r1 » 2.97 - 3.52 s-1mM-1) and high transverse relaxivity (r2 » 5.00 - 6.34 s-1.(%w/v)-1 vs. r2 » 3.80 - 4.55 s-1mM-1) compared to gadobutrol. Agarose showed a very high r2/r1 ratio (129.4-160.0) than gadobutrol (1.28-1.29), reflecting stronger gel-matrix effects on transverse dephasing than on longitudinal recovery. Tap-water immersion had shortened T1 by »9% relative to air, without significantly increasing variability. These findings provide relaxivity values for agarose and gadobutrol under well-defined conditions and illustrate how their complementary relaxation behavior can tune T1 and T2 values over a wide range to create customizable MRI calibration phantom for research and clinical use
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)
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)
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)
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
Effect of Sintering Temperature on the Phase Formation and Superconducting Properties of Bi1.6Pb0.4Sr2Ca2Cu3O10 Ceramics Synthesised via Co-Precipitation Nurhidayah Mohd Hapipi; Soo Kien Chen; Mohd Mustafa Awang Kechik; Kean Pah Lim; Abdul Halim Shaari; Nor Atikah Baharuddin; Nurul Auni Khalid; Muhammad Kashfi Shabdin; Kar Ban Tan; Oon Jew Lee
Journal of Material Science and Radiation Vol. 1 No. 2 (2025)
Publisher : Balai Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56566/jmsr.v1i2.387

Abstract

In this work, (Bi, Pb)-2223 superconducting ceramics with the nominal composition Bi1.6Pb0.4Sr2Ca2Cu3O10 were synthesised via the co-precipitation method and sintered at temperatures of 845 °C, 850 °C, and 855 °C. X-ray diffraction (XRD) analysis confirmed the dominance of Bi1.6Pb0.4Sr2Ca2Cu3O10 phase with minor traces of secondary phases, Ca2PbO4 (dicalcium lead (IV) oxide). An increase in sintering temperature led to a larger average grain size and reduced intergranular voids. Electrical resistivity measurements using the four-point probe method revealed the highest superconducting transition temperature (Tc onset = 104 K) for samples sintered at 845 °C. Higher sintering temperatures reduced the value of Tc onset and resulted in a wider transition width, ΔTc. These findings highlight the critical influence of sintering temperature on the structural and microstructural properties, which in turn govern the superconducting performance of (Bi, Pb)-2223 ceramics.
Influence of Sintering Temperatures on Pr0.7Ba0.3MnO3 Prepared Using Thermal Treatment Method Xiao Tong Hon; Kean Pah Lim; Lik Nguong Lau; Mohd Mustafa Awang Kechik; Soo Kien Chen; Muhammad Kashfi Shabdin; Nurhidayah Mohd Hapipi; Najihah Rohiat; Abdul Halim Shaari
Journal of Material Science and Radiation Vol. 1 No. 3 (2025)
Publisher : Balai Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56566/jmsr.v1i3.478

Abstract

In this work, Pr0.7Ba0.3MnO3 (PBMO) was synthesised using a thermal treatment method with sintering temperature ranging from 800 °C to 1100 °C. X-ray diffraction (XRD) confirmed the formation of pure PBMO phase at 1100 °C, while lower sintering temperatures led to the presence of secondary phase, particularly Pr(Mn2O5). Microstructural analysis revealed significant grain growth with rising sintering temperatures, accompanied by enhanced crystallinity and reduced secondary phases. Magnetic measurements indicated ferromagnetic behaviour at room temperature for all samples. However, the electrical resistivity demonstrates an unexpected increase with sintering temperature, attributed to the influence of secondary phase at lower sintering temperatures and grain growth in the pure PBMO phase at higher sintering temperatures. Additionally, microstructural defects such as oxygen non-stoichiometry or porosity might further contribute to the suppression of the metal-insulator transition temperature. Overall, this study highlights the significant role of sintering temperatures in controlling the phase purity, microstructure and physical behaviour of PBMO samples, offering valuable insights for their potential applications in spintronics or magnetic sensing devices.
Surface Morphology Evolution of Y-123 and Y-123+Sm Thin Films Before and After Post-Annealing Siew Hong Yap; Mohd Mustafa Awang Kechik; Nur Nabilah Mohd Yusuf; Arebat Ryad Alhadei Mohamed; Soo Kien Chen; Kean Pah Lim; Muhammad Kashfi Shabdin; Muhammad Khalis Abdul Karim; Nurhidayah Mohd Hapipi; Aris Doyan; Abdul Halim Shaari
Journal of Material Science and Radiation Vol. 2 No. 2 (2026): August
Publisher : Balai Publikasi Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56566/jmsr.v2i2.695

Abstract

Thin film surface morphology strongly influences their superconducting properties. However, there remains a research gap in comparative studies on the surface morphology of YBa₂Cu₃O7-δ (Y-123) thin films with Sm nano-inclusions (Y-123+Sm) and the effects of post-annealing. Therefore, this study presents a comparative analysis of the surface morphology of pure Y-123 and Y-123+Sm superconducting thin films deposited by Pulsed Laser Deposition (PLD). The deposited films were post-annealed in flowing oxygen at 900 °C for 18 hours. Surface morphology observations using a Polarized Optical Microscope (POM) for both pure Y-123 and Y-123+Sm thin films before and after post-annealing reveal a reduction in pores and agglomerated grains, accompanied by a decrease in grain size. Further analysis using an Atomic Force Microscope (AFM) indicates that the pure Y-123 film exhibits a decrease in average surface height and surface roughness after post-annealing. Interestingly, compared with the film before post-annealing, the Y-123 thin film after post-annealing shows more hole-like features and volcano-like island growth structures, together with a reduction in island peak height from 377.2 nm to 170.5 nm. In contrast, Y-123+Sm thin films demonstrate a more desirable island growth morphology despite exhibiting a relatively rougher surface after post-annealing. Structural analysis of X-ray Diffraction (XRD) spectra indicates improved crystallinity for both Y-123 and Y-123+Sm thin films after post-annealing. These findings provide fundamental insights for the development of superconducting materials for future applications, such as quantum computing devices and power transmission technologies based on Y-123 superconductors
Co-Authors Abdul Halim Shaari Aliah Nursyahirah Kamarudin Arebat Ryad Alhadei Mohamed Aris Doyan Aris Doyan Chen Soo Kien Hairil Rashmizal Abdul Razak Hussien Baqjiah Izdihar Kamal Izdihar Kamal Kar Ban Tan Kean Pah Lim Khairil Amir Sayuti Lik Nguong Lau Lim Kean Pah Maheran Che Ha’ Muhammad Kashfi Shabdin Muhammad Kashfi Shabdin Muhammad Khalis Abdul Karim Muhammad Khalis Abdul Karim Najihah Rohiat Nor Atikah Baharuddin Nur Nabilah Mohd Yusuf Nurhidayah Mohd Hapipi Nurul Auni Khalid Oon Jew Lee Rahayu Emilia Mohamed Khaidir Siew Hong Yap Siti Aisyah Mohd Nordin Soo Kien Chen Tan Kar Yeow Xiao Tong Hon Xinni Ni Yap Siew Hong Yusri Mohammed Zarina Ramli