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: Physical, Mechanical and Surface Quality Properties of Ater Bamboo Fiberboard (Gigantochloa atter Kurz.)
Abstrak: Penelitian ini bertujuan untuk menganalisis sifat fisis dan mekanis papan serat bambu ater (Gigantochloa atter Kurz.) akibat adanya perlakuan alkali (NaOH) dengan konsentrasi 2% dan 5%. Papan serat dibuat menggunakan perekat urea formaldehide (UF) dengan kadar perekat 10% dan target kerapatan sebesar 0.6 g cm-3. Pengujian dilakukan merujuk pada JIS A 5905 (2003). Berdasarkan hasil pengujian diperoleh nilai rata-rata kerapatan papan serat yaitu sekitar 0,60 sampai 0,62 g cm-3. Nilai rata-rata kadar air sekitar 9,36 sampai 9,58%. Nilai rata-rata pengembangan tebal selama 2 jam dan 24 jam berkisar antara 19,20 sampai 37,89% dan 30,02 sampai 53,80%. Nilai rata-rata daya serap air selama 2 jam dan 24 jam berkisar antara 99,98 sampai 131,77% dan 106,47 sampai 142,29%. Nilai rata-rata Modulus of Elastisity (MOE) berkisar antara 765,19 sampai 1069,54 MPa. Nilai rata-rata Modulus of Rupture (MOR) berkisar antara 6,69 sampai 10,40 MPa. Nilai rata-rata Internal Bond (IB) berkisar antara 0,09 sampai 0,14 MPa. Nilai rata-rata KPS berkisar 909,91 sampai 932,78 N. Nilai rata-rata kekasaran permukaan berkisar antara 3,82 sampai 4,35 µm. Pemberian perlakuan alkali konsentrasi 2% dan 5% dalam pembuatan papan serat bambu ater menurunkan nilai sifat fisis dan mekanis papan serat bambu ater. Hasil penelitian menunjukan nilai sifat fisis dan mekanis yang diperoleh umumnya belum memenuhi standar JIS A 5905 (2003) tipe 15, namun masih memenuhi tipe 5., The purpose of this study is to analyze the physical and mechanical properties of ater bamboo fiberboard (Gigantochloa atter Kurz.) concentrations of 2% and 5%. Fiberboard is made using urea formaldehyde (UF) adhesive with 10% adhesive content and density target was 0.6 g cm-3. The test was carried out referring to JIS A 5905 (2003). Based on the test, the average value of fiberboard density is around 0,60 to 0,62 g cm-3. The average value of water content is around 9,36 to 9,58%. The average value of thickness swelling for 2 hours and 24 hours ranged from 19,20 to 37,89% and 30,02 to 53,80%. The average value of water absorption for 2 hours and 24 hours ranged from 99,98 to 131,77% and 106,47 to 142,29%. The average value of the Modulus of Elasticity (MOE) ranged from 765,19 to 1069,54 MPa. The average value of the Modulus of Rupture (MOR) ranged from 6,69 to 10,40 MPa. The average value of Internal Bond (IB) ranges from 0,09 to 0,14 MPa. The average value of the KPS test ranged from 909,91 to 932,78 N. The average surface roughness value ranged from 3,82 to 4,35 µm. Alkali treatment with concentrations of 2% and 5% in the manufacture of ater bamboo fiberboard decreased the value of physical and mechanical properties of bamboo ater board. The results showed that the value of physical and mechanical properties generally did not meet the standards of JIS A 5905 (2003) type 15, but still fullfillment for type 5.
Keyword: bambu ater, papan serat, perlakuan alkali, urea formaldehyde, bamboo ater, fiberboard, alkali treatment, urea formaldehyde

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.
Keyword: