Muhamad Hafiz Ab Aziz
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Preferred name
Muhamad Hafiz Ab Aziz
Official Name
Muhamad Hafiz , Ab Aziz
Alternative Name
Ab Aziz, Muhamad Hafiz
Aziz, Muhamad Hafiz Ab
Aziz, Mohd H.A.
Aziz, M. H.A.
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Scopus Author ID
55370619800
Researcher ID
FYK-1560-2022

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  • Publication
    Temperature analysis of single busbar with variation of total harmonic distortion in current
    (Semarak Ilmu Publishing, 2025-11)
    Mohd Wafiuddin Yahya
    ;
    Baharuddin Ismail
    ;
    Afifah Shuhada Rosmi
    ;
    Muhammad Mokhzaini Azizan
    ;
    Chanuri Charin
    ;
    Muhamad Hafiz Ab Aziz
    ;
    Sharulnizam Mohd Mukhtar
    ;
    Yazhar Yatim
    Typically, busbars are used to transmit and distribute currents in a bus duct system. The alarming use of nonlinear loads in the industrial sector or at residentials, such as arc welding, computers, ballast lighting, variable speed drives, and so on, has resulted in the generation of harmonics in current distortion, which are uncontrolled and thus increase heat generation within the system. The research conducted in this paper focuses on the prediction of the heat distribution as well as the analysis on operating temperature of a single busbar with compliance to the British National and International Standard (BS 159: 2014) using the Finite Element Method (FEM) in COMSOL Multiphysics software. The copper busbar dimension used for this research was 20mm x 6mm x 300mm, and the fundamental Root Mean Square (RMS) current was 419.1 A. The size of this busbars can withstand the maximum current of 430 A at a maximum operating temperature of 90°C, which complies with the standard requirement. The fundamental current is injected with variation of total harmonic distortion in current up to 55% with an interval of 5%. According to the findings, the operating temperature increases in direct proportion to the increase in total harmonic distortion with the current injections. With the presence of 55% of total harmonics in the current, the current was increased up to 57.73 A from the fundamental current, while the operating temperature was increased up to 140C from the fundamental temperature. The total harmonics in current produced by the nonlinear loads could affect the operating temperature of the busbars, and this continuous operation of current flow will affect the busbars' lifespan due to the occurrence of overheating.
  • Publication
    Analysis and Development of a Poultry Hatching Machine
    ( 2020-07-09)
    Irfan Abd Rahim
    ;
    Muhamad Hafiz Ab Aziz
    ;
    Ghani H.A.
    ;
    Muhamad Farizuan Rosli
    ;
    Fazdly M.K.
    ;
    Azlida A.
    The egg-hatching machine comprises a several main factors that has been adapted and developed in this machine. The main factors are temperature, humidity, turning orientation and ventilation. The development of the machine without considering these factors will lead to failure or low percentage of hatching success. Therefore, these important factors must be included and adapted to machine. The best temperature for egg incubation is 37.8 °C or 100 °F and for relative humidity is from 55% to 65%. For egg, turning and orientation can be done from 2 to 6 times daily. The angle for turning is from 30° to 90°. The use of forced-air incubation method in this machine instead of still-air incubation had helped to regulate the air and supply oxygen to the eggs in the chamber. Besides considering all factors, other supportive factor that will help to increase the percentage of hatching success also must not be neglected. The supportive factors are location to place the machine, insulation for preventing heat loses and hygiene or cleanliness of the machine. Although these supportive factors are not the main parameter for egg incubation, these factors also need some attention as they also one the keys for hatching success.
      29  3
  • Publication
    Digital fringe projection system for round shaped breast tumor detection
    ( 2020-01-01)
    Wan Mokhdzani Wan Nor Haimi
    ;
    Zaliman Sauli
    ;
    Hasnizah Aris
    ;
    Vithyacharan Retnasamy
    ;
    Rajendaran Vairavan
    ;
    Muhamad Hafiz Ab Aziz
    The digital fringe projection has been widely used in the field of surface imaging however its application in the field of body imaging especially for human breasts is still quite limited. Currently, the common imaging modality for breast tumor diagnoses are breast ultrasound and mammogram. There are advantages and limitations of using the mammogram and ultrasound in terms of the procedure of the process and the non-invasive nature of the procedure. In this work, an automated digital fringe projection system is developed to execute the imaging of surface changes of a helical shaped phantom breast. The fringe projection setup utilizes a computer, LCD projector, and a CCD camera. The tumor used was round-shaped with a diameter size of 1.5 and 2 cm. The fringe pattern was projected through the three-step phase shift where a resulting phase map was obtained. Results demonstrated that the system was able to identify an average pixel shift of five and ten on the breast surface caused by the presence of the round breast tumors.
      4  46