Performance of Sugi lamina impregnated with low-molecular weight phenolic resin     

Andi Hermawan  Toru Nakahara  Hiroki Sakagami  Noboru Fujimoto  Kiyotaka Uchikura 《Journal of Wood Science》2013,59(4):299-306

This study was conducted to evaluate the performance of Sugi lamina impregnated with low-molecular weight phenolic (LMWP) resin using the full cell process followed by curing at high temperature. In this study, penetration of LMWP resin into finger-jointed lamina was examined. Physical and mechanical properties, such as surface hardness, dimensional stability, bending and shear strength of LMWP-resin-treated and untreated lamina were investigated. In addition, the bonding quality and nail-withdrawal resistance of 3-ply assembly specimen made from LMWP-resin-treated and untreated lamina bonded using resorcinol–phenol formaldehyde resin adhesive were also investigated. The main results were as follows: LMWP resin was found to have penetrated sufficiently into finger-jointed lamina. The physical properties of LMWP-resin-treated lamina were found to have improved significantly in comparison with untreated lamina. However, no significant difference was found between LMWP-resin-treated and untreated lamina in terms of their mechanical properties. There was an improvement in bonding quality of the assembly made from LMWP-resin-treated lamina when compared with that made from untreated lamina. In the assembly made from untreated lamina, a significant decrease in nail-withdrawal resistance was observed between dry conditions test and after humidity conditioning test. However, the same tendency was not found in the assembly made from LMWP-resin-treated lamina.  相似文献   

Relationship between sensory attributes of bakasang (a traditional Indonesian fermented fish product) and its physicochemical properties     

Silvana D. Harikedua  C. Hanny Wijaya  Dede R. Adawiyah 《Fisheries Science》2012,78(1):187-195

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Manufacture of composite board using wood prunings and waste porcelain stone     

Andi Hermawan  Takeshi Ohuchi  Noboru Fujimoto  Yasuhide Murase 《Journal of Wood Science》2009,55(1):74-79

The objective of this study was to develop a method for the effective use of both pruned wood and porcelain stone scrap. Thus, we manufactured a wood-porcelain stone composite board, which has excellent waterproof property and incombustibility properties. In addition, we examined the conditions needed to manufacture the wood-porcelain stone composite board as a construction material and evaluated the physical and mechanical properties of this board based on the Japanese Industrial Standard. The main results obtained were as follows: the wood-porcelain stone composite board made from pruned wood and porcelain stone scrap had excellent thickness swelling performance and the board had incombustibility properties that were better than commercial oriented strand board. In both single-layer and three-layer composite boards with weight ratios of porcelain stone particles of 40%, the internal bond strength exceeded the standard value of type 18 particleboard of JIS A 5908. However, the bending properties of the composite board were inferior to the type 18 particleboard standard. Therefore, it will be necessary to improve the bending properties of the board by changing the particle sizes of both the porcelain stone scrap and the pruned wood component. Part of this article was presented at the 57th Annual Meeting of the Japan Wood Research Society at Hiroshima, August 2007  相似文献   

PHYSICOCHEMICAL CHARACTERIZATION OF HAZELNUT HUSK RESIDUES WITH DIFFERENT DECOMPOSITION DEGREES FOR SOILLESS GROWING MEDIA PREPARATION     

O. H. Dede  G. Dede  S. Ozdemir  M. Abad 《Journal of plant nutrition》2013,36(13):1973-1984

In this study, the main physical, physiochemical, and chemical properties of hazelnut husk have been determined for the suitability as a container growing medium. Four substrates were prepared based upon decomposition degree: raw (H₁), medium decomposed (H₂, H₃), and strongly decomposed hazelnut husk samples (H₄), to determine the optimum growing medium parameters. Particle size was the key parameter to determine the physical properties, which was decreased with the increasing decomposition degrees. The main physical parameters were in the ranges for the ideal growing medium characteristics for H₄. Except for raw material (H₁), chemical characteristics such as pH, electrical conductivity (EC), carbon (C)/nitrogen (N), and nutrients were within acceptable ranges. The results indicated that hazelnut husk could be an alternative growing media component for containerized crops, if optimum particle size within the range of 0-2mm is obtained, for both aeration and water holding requirements.  相似文献   

Manufacturing oil palm fronds cement-bonded board cured by gaseous or supercritical carbon dioxide     

Dede Hermawan  Toshimitsu Hata  Shuichi Kawai  Wakatsu Nagadomi  Yasuo Kuroki 《Journal of Wood Science》2002,48(1):20-24

This study dealt with the effects of a curing method that uses gaseous and supercritical CO₂. Its effects on the properties of oil palm fronds cement-bonded board manufactured by the conventional cold-press setting method were recorded. The effect of MgCl₂ as an accelerator of cement setting was also investigated. The hydration of cement was examined using X-ray diffractometry, thermal gravimetry, and scanning electron microscopy. The results are as follows. (1) High-performance cement-bonded boards made from oil palm fronds were successfully manufactured using the CO₂ curing method. (2) The curing method using either gaseous or supercritical CO₂ resulted in accelerated curing of cement (within several minutes). Accelerated formation of the hydration products (e.g., calcium carbonate and calcium silicate) is the main reason for the high strength of CO₂-cured boards. (3) The CO₂ curing technology does not require setting accelerators, which cause a decrease in the dimensional stability of cement-bonded board.  相似文献   

Manufacture and properties of oil palm frond cement-bonded board     

Dede Hermawan  Bambang Subiyanto  Shuichi Kawai 《Journal of Wood Science》2001,47(3):208-213

This study was designed to reveal the role of the cement/wood ratio in a hydration test of wood-cement mixtures. The compatibility of oil palm (Elaeis guineensis Jacq) fronds-cement mixtures was tested in the hydration test, with the addition of magnesium chloride as an accelerator at different water/cement ratios. To prove the findings on the hydration behavior of components, the cement-bonded boards were manufactured using a conventional cold-pressing method at different cement/wood ratios. Results indicated that the optimum weight ration of cement/wood increased with decreasing wood powder size based on the equal specific surface area ratio of cement/wood in the hydration test and board manufacturing. The addition of magnesium chloride improved the compatibility of oil palm fronds with cement; the compatibility factor (C _A) increased by more than 90% with the addition of 5% magnesium chloride. TheC _A factor increased proportionally with a higher magnesium chloride content and a higher water/ cement ratio. The addition of magnesium chloride also enhanced the cement hydration and ultimate board strength properties. However, the addition of 5% magnesium chloride did not improve the properties of boards sufficiently at a cement/wood ratio of 2.21.0.  相似文献   

An acetylenic alkaloid from the calcareous sponge Leucetta sp     

Hermawan I  de Voogd NJ  Tanaka J 《Marine drugs》2011,9(3):382-386

A new acetylenic alkaloid was isolated from the sponge Leucetta sp. The structure was established by analyzing spectroscopic data. The alkaloid showed cytotoxicity IC₅₀ 2.5 μg/mL against NBT-T2 cells.  相似文献