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Articles by Wan-Mohd-Nazri Wan-Abd-Rahman
Total Records ( 2 ) for Wan-Mohd-Nazri Wan-Abd-Rahman
  Hazandy Abdul- Hamid , Arifin Abdu , Mohd-Kamil Ismail , Mohd-Khairul- Anuar Rahim , Abdul-Latib Senin and Wan-Mohd-Nazri Wan-Abd-Rahman
  Gas exchange is important for determining the species plasticity. However, study on gas exchange in dipterocarp is almost non-existence and this study may provide useful information for future references. The study was conducted at the Compartment 14, Ayer Hitam Forest Reserve, Puchong and Selangor, Malaysia. The main objective of this study was to determine the leaf gas exchange of three dipterocarps, Shorea platyclados V. SI. ex Foxw. (meranti bukit), Shorea assamica Dyer forma globifera (Ridl) Sym. (meranti pipit) and Anisoptera marginata Korth. (mersawa paya) planted in different sizes of gap. The results showed that the gas exchange parameters were not significantly different between species except stomatal conductance (Gs) and transpiration rate (EL). Insignificant differences of all the gas exchange parameters were also observed between planting designs. Meanwhile, the correlation analysis showed that insignificant effect of design on species for net photosynthesis (Anet) is due to the effect of internal CO2 concentration (Ci). However, the significant difference observed for transpiration rate (EL) between species might be due to the significant roles of stomata conductance (Gs). Overall, the higher tropical species plasticity by introducing reciprocal planting in rehabilitation programme has produced mixed results.
  Siti-Noorbaini Sarmin , Wan-Mohd-Nazri Wan-Abd-Rahman , Jamaludin Kasim , Othman Sulaiman , Rokiah Hashim and Hazandy Abdul-Hamid
  The study was conducted to determine the dimensional stability properties of Laminated Veneer Lumber (LVL) from Oil Palm Trunk (OPT) bonded with three different cold set adhesives namely Emulsion Polymer Isocyanate (EPI) and polyvinyl acetate (PVAc). Three-ply experimental LVL from OPT veneers were bonded using two adhesive spread levels, 250 and 500 g m-2 for single glue line. Laminated veneer lumber from rubberwood was used as control. The dimensional stability properties investigated include dimensional changes associated with changes in relative humidity of 30 to 90%, hysteresis over a range of 30 to 90% and durability against biological attack through soil burial. Amongst the three adhesives, OPT LVL manufactured with EPI (VAc) had the highest Fibre Saturation Point (FSP) and the least was experienced by OPT LVL bonded with PVAc. Totally, the magnitude of hysteresis was below 1.00 which in the average 0.69 to 0.82 for OPT LVL panels while rubberwood LVL, 0.81 to 0.94, respectively. Overall, the dimensional stability properties of LVL from OPT bonded with cold setting adhesives namely EPI (SBR), EPI (VAc) and PVAc were found to be comparable with rubberwood.
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