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Articles by A. Selamat
Total Records ( 3 ) for A. Selamat
  M.A. Hakim , A.S. Juraimi , M.R. Ismail , M.M. Hanafi and A. Selamat
  This study aimed to develop appropriate weed management technology on selected salt tolerant rice variety(s) as well as to develop package of production technologies for rice in saline environments of Malaysia. This study was conducted at 40 different rice fields in 10 blocks of Kedah coastal area of West Malaysia during June-July, 2009 to identify most common and prevalent weeds associated with rice. Fields survey were done according to the quantitative survey method by using 0.5x0.5 m size quadrate with 20 samples from each field. A total of 42 different weed species belonging to 17 families were identified of which 25 annual and 17 perennial; 9 grassy weeds, 11 sedges and 22 broadleaved weeds. Leptochloa chinensis, Echinochloa crusgalli, Fimbristylis miliacea, E. colona, Cyperus iria, Sphenoclea zeylanica, Cyperus deformis, Oryza sativa spontanea, Scirpus grossus and Jussia linifolia were most frequent species covering more than 50% fields. Based on relative abundance indices, annuals were more dominant than perennials. Leptochloa chinensis, Echinochloa crusgalli, Fimbristylis miliacea, E. colona were most dominant weed species in the coastal rice field of Kedah.
  M. Ramli , A. Selamat , N. Misran , M.F. Mansor and M.T. Islam
  The design of reconfigurable reflectarray with a single varactor to provide capacitance effect embedded inter-patch are presented. The essence of this concept lies in the behavior of the capacitance variation contributes to phase changes of element. Simulated radiation patterns with single element phase characteristics as a reference are reported to demonstrate reconfigurability of elements for beam scanning at Ku-band. The consistency in pattern and value of single and 2x2 sub-array will provide guideline and indicator on how to get promising beam scanning result for full reflectarray fabrication and measurement. The radiation pattern of linear array by three different elements with 35° scanning angle at Ku-band is analyzed and has confirmed the important of single and sub-array characteristics in array realization.
  A. Selamat , M. Ramli , N. Misran , M.F. Mansor and S.H. Zaidi
  A low profile solar cell integrated with reflectarray element composed of multilayer materials is presented in this study. A unit cell consist of triangular loop shape element is varied in size to get the required phase range. Some modification is then introduced to the triangular loop element aimed to optimize the bandwidth. A wide bandwidth range over 15% has been achieved. A prototype of the solar reflectarray cell was fabricated and measured. The measured results show good agreement with simulation. The element is designed to be operated at Ku-band frequency and formed a solar reflectarray antenna used for terrestrial applications.
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