Zahari Awang Ahmad
Thumbnail Image
Preferred name
Zahari Awang Ahmad
Official Name
Zahari, Awang Ahmad
Alternative Name
Ahmad, Zahari A.
Ahmad, Zahari Awang
Ahmad, Z. A.
Main Affiliation
Scopus Author ID
57188717442
Researcher ID
GAH-5795-2022

Research Output

Filters

2 1 1
2
Reset filters

Settings
Now showing 1 - 2 of 2
  • Publication
    A Free-Space measurement system for microwave materials at Kuband
    ( 2022-01-01)
    Sivakumar Renukka
    ;
    Lee Y.S.
    ;
    Saidatul Norlyana Azemi
    ;
    Zahari Awang Ahmad
    ;
    Jack Soh P.
    ;
    You K.Y.
    One of the non-resonant techniques is the free-space measurement technique, which is popular due to its many advantages compared to the other techniques. It allows the transmission and reflection measurements without any physical contact with the sample. This paper discusses the free-space material measurement system in Ku-band which uses the NRW algorithm and Keysight (Formerly Agilent) 85071E software in determining the dielectric properties of materials. The permittivity and permeability of Teflon, FR4, PVC, ABS, Acrylic, polypropylene, polycarbonate, and epoxy were determined using free space measurement setup. For the first, a free-space measurement for Ku-Band is setup. It consists of a vector network analyzer, two horn antennas, sample holder, and Keysight 85071E software. The different role of transmission and reflection measurements on the achievable results is analyzed about experimental uncertainties and different noise scenarios. Results from the two strategies are analyzed and compared. Good agreement between simulation, measurement, and literature was obtained.
      14  2
  • Publication
    Development of aquaculture water quality real-time monitoring using multi-sensory system and internet of things
    ( 2021-12-01)
    Abu Hassan Abdullah
    ;
    Fathinul Syahir Ahmad Sa'ad
    ;
    Sukhairi Sudin
    ;
    Zahari Awang Ahmad
    ;
    Ahmad I.
    ;
    Norlida Abu Bakar
    ;
    Shafie Omar
    ;
    Sulaiman S.F.
    ;
    Mohd Hishamuddin Che Mat
    ;
    Nurul Afidah Umoruddin
    ;
    Johari B.H.
    Water quality is an important parameter for the health and growth of aquatic species in aquaculture farming system. The threshold values of the water main parameters should be monitored continuously. Contaminated aquaculture water will affect the health, growth and ability of animals to survive. In addition, it will also affect the harvesting yields based on the number and size of the animals. To overcome this problem, the main water parameters, namely temperature, pH, Dissolved Oxygen and Electrical Conductivity are monitored in real-time using a multi-sensory system and the internet of things. Data is acquired by a developed instrument and transmitted wirelessly via a GPRS/GSM module to a web server database. The data obtained are analyzed and monitored through the website and in real-time. Therefore, corrective action could be taken immediately for contaminated water, indicated by water parameters out of range. The system also provides an early signal to farmers based on a specific range of water quality parameters values. This will help farmers make adjustments to ensure appropriate water quality for the aquaculture system.
      1  19