Siti Khadijah Za'aba
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Preferred name
Siti Khadijah Za'aba
Official Name
Za'aba, Siti Khadijah
Alternative Name
SK Zaaba
Zaaba SK
Zaaba Siti Khadijah
Main Affiliation
Scopus Author ID
36151525400

Research Output

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  • Publication
    Review on the development of plasma discharge in liquid solution
    ( 2017-03-30)
    Nur Arina Hasmimi Ramli
    ;
    Siti Khadijah Za'aba
    ;
    Mohammad Taufiq Mustaffa
    ;
    Ammar Zakaria
    ;
    Shahriman Abu Bakar
    Review papers on the basic principles and applications of plasma discharge in liquid have been reported. However, the development of plasma discharge in liquid is not widely reviewed. The aim of this paper is to review on the elements involved in developing plasma discharge in liquid. An overview will be given of the various types of existing power source, working gas, dielectric barrier, electrode material used to produce plasma, and reactive species production inside plasma discharge.
      2  32
  • Publication
    Review on prevention of bacterial adhesion on contact lens using plasma treatment
    ( 2017-03-30)
    Nur Arina Hasmimi Ramli
    ;
    Siti Khadijah Za'aba
    ;
    Mohammad Taufiq Mustaffa
    ;
    Ammar Zakaria
    ;
    Shahriman Abu Bakar
    Many researches had been conducted to enhance the properties of contact lens. Most of the research conducted discussed on the factors that affect the adhesion process to contact lenses, rate of contact lens contamination, and type of microbe that adhere on the contact lens surface and contact lens casing. Studies on the proposed strategies or technology that can be used to slower down the formation of bacteria on contact lens are being explored. New technologies or strategies to prevent or slow down the adhesion of bacteria on contact lens have become a priority in this area. This review paper covers two main aspects, namely factor that affect the bacteria adhesion on contact lens and also the introduction of plasma treatment as a potential method for contact lens treatment.
      35  5
  • Publication
    Preliminary analysis of the degradation of methylene blue by using plasma discharge in liquid
    (Universiti Malaysia Perlis, 2018-11)
    N. A. H. Ramli
    ;
    Siti Khadijah Za'aba
    ;
    Mohammad Taufiq Mustaffa
    ;
    Wan Khairunizam Wan Ahmad
    ;
    Shahriman Abu Bakar
    This article presents the results of experimental work on the identification of reactive species produced by plasma discharge in liquid. The analysis was conducted using methylene blue (MB) as chemical probe. There are two objectives, 1) to identify the effect of ground electrode configuration to the presence of reactive species and 2) to observe the ground electrode durability. Results showed that, degradation of MB occurred when using 7 kV input supply and insulated ground electrode for 10 minutes. Meanwhile, the other input supply (7.8 kV and 8.6 kV) were unable to degrade MB solution.
      21  2
  • Publication
    Analysis of airbox performance improvement for Modenas model by geometrical analysis
    (IOP Publishing, 2017-10-29)
    Shahriman Abu Bakar
    ;
    Mohamad Syafiq Abdul Khadir
    ;
    Hamid K.A.
    ;
    Mohd Sani Mohamad Hashim
    ;
    Hazry Desa
    ;
    Zuradzman Mohamad Razlan
    ;
    Ruslizam Daud
    ;
    Cheng Ee Meng
    ;
    Siti Khadijah Za'aba
    ;
    Teh W.S.W.
    ;
    Shuaib N.A.
    ;
    Wan K.
    ;
    Ishak A.A.
    Airbox system consist of filter element which greatly influenced the quality air into the engine system. The main objective of this study is to improve the performance of airbox system that attached in MODENAS CT115S engine system. Airbox, an empty air chamber, accumulates the outside air and feed it to the cylinder of the engine for combustion process and contains filter element. The function is to provide cleaner air for greater combustion rate and cleaner emission. The performance of airbox can be influenced by changing the location of the filter element and the geometry of airbox. By changing these parameters, the performance of the airbox system can be enhanced. In this study, the geometry of the airbox inlet has been changed in terms of shape and size. The inlet shape for Design 1 in round shape with a diameter of 43.60 mm. Meanwhile for Design 2, the geometry of airbox inlet was changed to a rectangular shape. Between these two designs, Design 1 provides a better result in terms of mass flow rate (10.41 kg/s), velocity (9.84 m/s) and pressure difference (83.44 kPa). By increasing the performance of airbox, the performance of engine can be increased.
      6  18
  • Publication
    Improvement of cam performance curve using B-Spline curve
    (IOP Publishing, 2017-10-29)
    Shahriman Abu Bakar
    ;
    Mohamad Syafiq Abdul Khadir
    ;
    Wan K.
    ;
    Hashim M.S.M.
    ;
    Hazry Desa
    ;
    Cheng Ee Meng
    ;
    Ruslizam Daud
    ;
    Zuradzman Mohamad Razlan
    ;
    Siti Khadijah Za'aba
    ;
    Muhammad Azizi Azizan
    The mathematical modeling approach has been applied in order to increase the cam profile curve of Modenas CT115s performance by using MATLAB software as a programmed to calculate the mechanism of the cam profile. Cam is used inside the engine to push the rocker and consequently open and close the engine valve that allows the fuel-air mixture to be entered during the combustion process. The B-Spline curve was implemented in order to enhance the current performance of the cam profile. The calculation had been done by using manual and MATLAB software. The results obtained has been analyzed and interpreted in plotting the graphs. From the analysis, the profile that had the highest displacement factor, sk produced higher cam curve performance of the engine. Thus, it can be concluded that the increase of the displacement factor, sk can increase the engine performance as the valve displace further in which allow higher fuel-air mixture entrance during the combustion process.
      3  18