Judul: Sifat Fisis dan Mekanis Papan Partikel Bambu Ampel dengan Perlakuan Perendaman Asam Asetat
Abstrak: Manufacturing of interior particle boards commonly use urea formaldehyde (UF). The adhesion process of UF is optimum in acidic pH condition. Acetic acid immersion aims to raise the level of acidity of ampel bamboo particles to accelerate the adhesion level of the UF adhesive and to increase physical and mechanical properties of board. Method that used in this research was carried out dipping of ampel particle in 1 and 3% acetid acid and hardener with adhesive treatment. The results of this research will be compared to control. The purpose of this study was to determine the physical and mechanical properties of particle boards made from Ampel bamboo after acetic acid pretreatment, and it compares to particle board with hardener and control. The results showed that the Density, Moisture Content (MC), Modulus of Rupture (MOR), Internal Bond (IB), Strong Hold Screws (SHS) in the particle board acetic acid soaking treatment and mixing hardener has met to JIS A 5908: 2003 standard with a density value more than 0.4 g cm-3, MC below 13%, MOR more than 8.36 N mm-2, IB more than 0.15 N mm-2, and the SHS more than 304 N.
Keyword: Bogor Agricultural University (IPB), Particle boards., hardener, adhesives UF, acetic acid

Judul: Sifat fisis dan mekanis papan partikel Bambu Betung dengan perlakuan perendaman asam asetat
Abstrak: Bamboo can be used as an alternative raw material for many wooden products. One of the promising products that can be developed from bamboo is a particleboard. However, previously experiment reported that some physical and mechanical properties of bamboo particleboard were lower than that of standard requirement. In order to improve the quality of bamboo particleboard, this research aimed to study the effect of acetic acid soaking pretreatment on physical and mechanical properties of Betung bamboo particleboard. Bamboo particle was soaked in 1, 2, and 3% acetic acid solution, respectively. Urea formaldehyde (UF) adhesive was used for binder which the target density of particleboard was set at 0.70 g/cm3. The UF bonding of bamboo particleboard with and without addition of hardener were used as control. Physical and mechanical properties of particleboard were tested in accordance with JIS A 5908:2003 standard. The result showed that acetic acid soaking pretreatment increases the physical properties of particleboard, nevertheless, it has not met the standard of Japanese Industrial Standard (JIS A 5908:2003). The mechanical properties of particleboard have met the standard of Japanese Industrial Standard (JIS A 5908:2003) for modulus of rupture (MOR), internal bond (IB) and Screw Holding Power. The increasing of acetic acid concentration the decreasing of board strength was observed, indicating that a part of chemical component of bamboo degraded by acid.
Keyword: Bogor Agricultural University (IPB), urea formaldehyde, particleboard, betung bamboo, acetic acid

Judul: Truncated Stop Loss as a Optimal Solution of Reinsurance Agreement in One-Period Model
Abstrak: Reinsurance is one of risk management efforts of an insurance company, which is called the cedent. Similar with insurance, reinsurance constitutes the cedent to pay the premium. We consider one-period reinsurance model and derive a rule which minimizes the ruin probability of the cedent for a fixed reinsurance premium. Therefore, it is needed to construct an optimal reinsurance agreement for the cedent. The premium is calculated according to four different principles, i.e. economic, generalized zero-utility, Esscher, and mean-variance principles. Stop loss is a reinsurance contract which protect the insurance company for losses that exceed a certain amount. The result of this research shows that a truncated stop loss is an optimal agreement in the class of all reinsurance contracts with various premiums calculated using above mentioned principles.
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