Judul: Ketahanan Oriented Strand Board Bambu dengan Perlakuan Steam dan Non Steam terhadap Serangan Rayap dan Kumbang Bubuk
Abstrak: The objectives of this research were to evaluate the resistance of bamboo oriented strand board (BOSB) made from several bamboo species with or without steam treatment against subterranean termite (Coptotermes curvignathus), dry wood termite (Cryptotermes cynocephalus) and powder post beetle attacked. Five (5) bamboo species namely betung, andong, ampel, hitam, and tali bamboos were obtained from Sukabumi. Prior to be mixed with adhesive, part of bamboo strands were steamed in autoclave at 126 °C, 1,4 kg/cm2 pressure for 1 h. Three layered OSBs were produced. The strand composition for face, core, and back was 25%, 50% and 25%, respectively. Commercial Phenol Formaldehyde (PF) adhesive in amount of 10% was used to bond the strands to BOSB. The results indicated that the resistance of solid bamboo was varied among species against C. curvignathus. The resistance of BOSB prepared both from steamed and non steamed bamboo strands were much higher compared to solid bamboo. The resistance of BOSB prepared from steamed bamboo strands was higher than non steamed bamboo strands. The resistance of solid bamboo against C. cynocephalus much depended on the presence of bark in the specimen tested. After converted into BOSBs, the resistances of all BOSBs with or without steamed treatment were much improved. The resistance of solid bamboo was varied among species against powder post beetle. After converted into BOSBs, the resistance of all BOSBs with or without steamed treatment were increased significantly compared to solid bamboo. It was observed that powder post beetle species attacked the specimen in this experiment is Anobium sp.
Keyword: subterranean termite, steam, powder post beetles, oriented strand board, drywood termite

Judul: Ketahanan Oriented Strand Board Unggul dari Bambu Andong Melalui Modifikasi Steam terhadap Serangan Rayap
Abstrak: Penelitian ini bertujuan untuk menguji ketahanan OSB bambu andong terhadap serangan rayap tanah Coptotermes curvignathus Holmgren dan rayap kayu kering Cryptotermes cynochephalus Light. Strand bambu andong diberi perlakuan steam pada suhu 126oC dengan tekanan 1.4 kg/cm2. Strand yang sudah di-steam diberi tiga perlakuan berbeda yaitu tanpa pembilasan, pembilasan dengan aquades dan pembilasan dengan NaOH 1%. Strand direkatkan menjadi OSB menggunakan perekat fenol formaldehida dengan kadar perekat 6%, 7%, dan 8%. Pengujian ketahanan terhadap rayap tanah mengacu pada JIS K-1571-2004 dan rayap kayu kering mengacu pada SNI 01-7202-2014. OSB dengan kadar perekat 8% dan modifikasi steam dengan pembilasan NaOH 1% memiliki ketahanan terhadap rayap tanah maupun rayap kayu kering yang lebih baik daripada OSB modifikasi steam tanpa pembilasan dan pembilasan dengan aquades serta bambu betung utuh. Analisis statistika menunjukan bahwa kadar perekat dan modifikasi steam memberikan pengaruh yang sangat signifikan terhadap ketahanan OSB terhadap rayap kayu kering dan rayap tanah.
Keyword: Coptotermes curvignathus, Cryptotermes cynocephalus, fenol formaldehida, keawetan, modifikasi steam

Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
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