KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/kmitl/1

Browse

Settings

Subject: search.filters.subject.Propagation

Search Results

Now showing 1 - 3 of 3
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Study on optimization for in vitro propagation of Dalbergia oliveri by plant tissue culture
    (2024-03-01)
    Nonthasila, S.
    ;
    Pongtongkam, P.
    ;
    Chareonsap, P. P.
    ;
    Poeaim, A.
    ;
    Poeaim, S.
    The experimental findings demonstrated that the highest proliferation frequency (100%), along with the maximum number of shoots per explant (3.33±0.52 shoots) and an average shoot length of 30.04±1.70 mm, were achieved in the Murashige and Skoog (MS) medium supplemented with 2.0 mg/l of 6-benzylaminopurine (BAP). Subsequently, upon reaching a height of 3 to 4 cm, the in vitro micro shoots were transferred to a ¼ MS medium enriched with 0.75 mg/l of indole-3-acetic acid (IAA). This particular regimen resulted in the highest number of roots per shootlet (3.50±0.58) with an average root length of 34.19±0.79 mm. The acclimatization phase of the plantlets to the soil was successful, demonstrating a commendable survival rate of 80%.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Radiation analysis of an equivalent magnetic UHF-RFID tag located on a coated metallic sphere using UTD method
    (2017-01-17)
    Phaebua, Kittisak
    ;
    Wongsiritorna, Pitchanun
    ;
    Lertwiriyaprapa, Titipong
    ;
    Phongcharoenpanicha, Chuwong
    The radiation analysis of an equivalent magnetic UHF-RFID tag antenna located on a coated metallic sphere using UTD method is illustrated in this work. The conventional UHF-RFID tag can be represented by electric current source and is designed by employing the dipole antenna concept. The electromagnetic (EM) radiation characteristic of UHF-RFID tag mounted on the metallic and material coated metallic curved objects can be distorted because the electric field is parallel to the metallic surface. It is very important to include the metallic objects when designing the UHF-RFID tag. In this work, the uniform geometrical theory of diffraction (UTD) method is employed to predict the EM radiation characteristic of the electric current source and equivalent magnetic current sources mounted on a coated metallic sphere. It is noted that the equivalent magnetic current source provides broader beamwidth. This makes the communication area wider than the electric current source case. An example of UHF-RFID tag is designed in this work based on the equivalent magnetic current source or slotted antenna concept. The calculated result is confirmed by comparing with the CST Microwave studio simulation. It is confirmed that the UTD method is suitable for the radiation calculation of the tag mounted on material coated metallic curved objects.
  • Loading...
    Thumbnail Image
    Some of the metrics are blocked by your 
    consent settings
    Item type:Publication,
    Investigated performance of Davidson model for DVB-T2 propagation in medium and small urban area
    (2017-01-01)
    Keawbunsong, Pitak
    ;
    Supannakoon, Pitchaya
    ;
    Promwong, Sathaporn
    This study investigates the efficiency of Davidson Path Loss Model in order to apply for use in the DVB-T2 propagation network design for medium and small urban areas in southern Thailand. The data being collected from the electric field strength while broadcasting of two channels within urban areas of Hadyai, Songkla Province are used for the path loss analysis. The result through a comparison on the efficiency of an old Davidson Model and a calibrated Root Mean Square Error (RMSE) model along with an efficiency index of Relative Error (RE) shows that the old Davidson Model is closer to the measured data than the calibrated ones. The statistics also demonstrates that the RE of the old Davidson Model is at the least when being compared with the RE of both the calibrated and the Hata Models. The old Davidson Model is therefore, the most accurate and the most optimized for the design of the propagation network.
      1