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RISS 인기검색어
- 검색키워드
- 저자 : Mohd. Hamami Sahri (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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Some Physical Properties of 9-Year-Old Xylia xylocarpa Planted in Malaysia
Mohd. Hamami Sahri,James Josue,Su Kyoung Chun 한국가구학회 2008 한국가구학회지 Vol.19 No.6
Xylia xylocarpa is fast-growing trees that are currently planted on trial basis in Sabah, Malaysia. The wood quality of trees grown in Sabah may differ from those grown in other places due to the environmental factors. Five 9-year-old trees of each species were extracted from their respective plots at Luasong, Tawau. Wood specimens were prepared from three height levels; bottom, middle and top, at the inner and outer radial positions. The within-tree and between-tree variations of physical properties of these species were analyzed. The basic density, oven-dry density and green moisture content (MC) are 0.72 g/㎤, 0.78 g/㎤ and 49.8% respectively. The shrinkage from green to oven-dry conditions for the radial and tangential directions were 3.35% and 5.76%, respectively. The trends of within-tree variations for most properties were more consistent in radial rather than vertical direction. This suggests diameter growth to be a more important factor contributing to the variations compared to height. Samples from the outer part of the stem were found to have higher density, shrinkage and mechanical strengths. The between-trees variations of some wood properties were found to be significantly different, probably due to genetic and micro-environmental factors. Significant correlation was recorded among the physical properties of the species. The true potential of X. xylocarpa for end-uses would be enhanced by further research such as the study on properties of wood from different sites and other properties like durability, seasoning, processing and machining characteristics. The characteristics of X. xylocarpa are comparable to a number of local popular hardwood species, indicating its suitability for heavy construction uses.
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Wood and Cellular Properties of 4 New Hevea Species
Norul Izani Md. Allwi,Mohd. Hamami Sahri,Su Kyoung Chun 한국가구학회 2008 한국가구학회지 Vol.19 No.4
Increasing demand for timber and the depletion of natural forest have encouraged utilization of many non-popular species. The understanding of wood properties and behavior is important to evaluate the potential of these species to produce high quality end products. This study determines the anatomical and physical properties of Hevea species viz Hevea pauciflora, Hevea guianensis, Hevea spruceana, Hevea benthamiana and Hevea brasiliensis. Each sample tree was cut into three different portions along the height (bottom- B, middle- M and upper -T parts) and two radial samples (outer- O and inner- I parts). H brasiliensis clone RRIM 912 exhibited the longest fibre with 1214㎛, followed by H. benthamiana (HB, 1200㎛), H.pauciflora (HP, 1189㎛), H. spruceana (HS, 1158㎛) and H. guianensis (HG, 1145㎛). Fibre length has a positive correlation with specific gravity. The largest fibre diameter (24.9㎛) and lumen diameter (12.5㎛) were recorded in H. guianensis. The highest moisture content was obtained from H. spruceana (64.34%) compared to the lowest with 60.01% (Clone RRIM912). The higher moisture content is normally associated with lower strength. Overall, the properties of clone RRIM 912 is found to be comparatively better because of higher strength due to longer fibre length, thicker cell walls and higher specific gravity than the other Hevea species. Therefore, this species can be used as a general utility timber.
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Wood and Cellular Properties of 4 New Hevea Species
Allwi, Norul Izani Md.,Sahri, Mohd. Hamami,Chun, Su-Kyoung Korea Furniture Society 2008 한국가구학회지 Vol.19 No.4
Increasing demand for timber and the depletion of natural forest have encouraged utilization of many non-popular species. The understanding of wood properties and behavior is important to evaluate the potential of these species to produce high quality end products. This study determines the anatomical and physical properties of Hevea species viz Hevea pauciflora, Hevea guianensis, Hevea spruceana, Hevea benthamiana and Hevea brasiliensis. Each sample tree was cut into three different portions along the height (bottom- B, middle- M and upper -T parts) and two radial samples (outer- O and inner- I parts). H. brasiliensis clone RRIM 912 exhibited the longest fibre with $1214{\mu}m$, followed by H. benthamiana (HB, $1200{\mu}m$), H. pauciflora (HP, $1189{\mu}m$), H. spruceana (HS, $1158{\mu}m$) and H. guianensis (HG, $1145{\mu}m$). Fibre length has a positive correlation with specific gravity. The largest fibre diameter ($24.9{\mu}m$) and lumen diameter ($12.5{\mu}m$) were recorded in H. guianensis. The highest moisture content was obtained from H. spruceana (64.34%) compared to the lowest with 60.01% (Clone RRIM912). The higher moisture content is normally associated with lower strength. Overall, the properties of clone RRIM 912 is found to be comparatively better because of higher strength due to longer fibre length, thicker cell walls and higher specific gravity than the other Hevea species. Therefore, this species can be used as a general utility timber.
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