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  • Publication
    MSG488 - Mathematical Algorithms for Computer Graphics February 2021
    (2021-02)
    PPSM, Pusat Pengajian Sains Matematik
    Please check that this examination paper consists of THREE (3) pages of printed material before you begin the examination. Instructions : Answer FIVE (5) questions.
  • Publication
    The prevalence of obesity and its associated factors among nursing students in Universiti Sains Malaysia
    (2023-06)
    Zaini, Nur Zulfatul Izzah Mohammad
    Obesity according to WHO (2021) is refers to Body Mass Index (BMI) greater than or equal to 30 kg/m². Obese people are at risk for many negative effects relating to health. Obesity has grown to epidemic proportions, with over 4 million people dying each year as a result of being obese in 2017, that caused a chronic health condition. This study aims to assess the prevalence of obesity, its association with physical activity, stress, eating behavior and selected socio-demographic factors among nursing students in USM. A cross-sectional survey was done using a set of self-administered questionnaires that contained questions from the IPAQ, PSS-10 and Eating Behavior scales. A total of 207 nursing students from Diploma and Bachelor programmes participated in this study. Data were analyzed by using SPSS version 27.0. The findings indicated that a total 24 (11.6%) nursing students had obesity. Most of the participants had moderate physical activity (45.4%), moderate stress (82.6%) and good eating behavior (20.7%). There is no significant association between obesity with physical activity (p=0.987), stress (p=0.970) and eating behavior (p=0.665). In terms of socio-demographic factors, a significant association was only indicated in age (p=0.048) and gender (p=0.048). In conclusion, although the prevalence of obesity is considered lower among nursing students in USM, appropriate and continuous initiative need to be done by the authorities to raise young people’s awareness on the bad impact of obesity and encourage them to keep practicing healthy life style.
  • Publication
    Effect Of Stand-Off Distance And Plasma Current On The Properties Of Hydroxyapatite Coatings Produced By Plasma Spray
    (2014-12)
    Sulaiman, Wan Ruzaini Wan
    Plasma sprayed hydroxyapatite (HA) coatings on metallic implants for biomedical applications are attracted significant researchers interest due to accelerated rate of bone bonding that occurs following their implantation. This present work aims to produce plasma sprayed HA coatings with varying spray parameters (i.e.; stand-off distance, SOD and plasma current, PC) in order to control the coatings crystallinity. The substrate used is 316L stainless steel. Five SODs were selected i.e. 80 mm, 100 mm, 120 mm, 140 mm and 160 mm combined with two different PCs (500 A and 600 A), respectively. The coatings then divided into two groups (as sprayed and heat treated). Both coating was subjected to in vitro test through immersion in SBF solution up to 28 days to determine their bioactivity. The coating properties before and after immersion in SBF were analyzed using FESEM and XRD. The analysis showed coatings morphology consists of type III, V and VIII splats with lamella and non-lamella structures. The crystallinity of as-sprayed coatings is in vicinity of 50%. However, the crystallinity increases more than 90% after heat treatment process. The in vitro analysis proved that the highest apatite layer precipitations on surface with coatings surface was from the assprayed coatings rather than the one being heat treated. Therefore, the quality of HA coating via plasma spray coating technique can be modified through the suitable combination is at SOD 120 mm and PC 600 A.
  • Publication
    Mineralogical alteration and paragenesis of gold mineralization in Air Piau deposit, Kelantan, Peninsular Malaysia
    (2025-08-04)
    Muhamad Rai-Yan bin Mohamad Hatta
    The Air Piau deposit in Kelantan, situated within Malaysia’s Central Gold Belt, hosts significant gold mineralization associated with mesothermal quartz veins in deformed metasedimentary rocks, yet its mineralogical alteration and paragenesis remained poorly characterized compared to other regional deposits. This research aimed to investigate the mineralogical alteration and paragenesis gold mineralization at the Air Piau deposit. The study combined detailed petrography, ore microscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), and Atomic Absorption Spectroscopy (AAS). Laboratory preparation of thin and polished sections for mineralogical characterization. The results revealed that gold mineralization is spatially associated with quartz-carbonate veins hosted in greenschist (Chl+Bt+Qz) to lower amphibolite facies metasediments. Hydrothermal alteration zones(propyllitic and argillic), were found to correlate strongly with elevated gold concentrations. The highest gold content recorded was 0.93 ppm, with corresponding high values of arsenic (137 ppm) and lead (100 ppm). Paragenetic analysis indicated multiple stages of mineral deposition influenced by regional tectonics and magmatic-hydrothermal processes. This study provides the comprehensive mineralogical alteration of the Air Piau gold deposit to refine exploration models and guide more effective targeting of mineralized zones in Central Gold Belt, Malaysia.