Judul: Ketahanan Papan Komposit dari Limbah Kayu dan Karton Gelombang terhadap Serangan Rayap Tanah (Coptotermes curvignathus Holmgren)
Abstrak: This research was designed to determine the level of composite boards resistance against subterranean termites C. curvignathus. The composition of the adhesive between the water-based polymer isocyanate (WBPI) and melamine-formaldehyde (MF) were 1:0, 1:4, 0:1, and paraffin content of 0, 4, 8% based on oven dry particle and corrugated carton. The produced composite boards consisting of three layers. The face and back layers made of corrugated carton waste and the core layer was made of wafer wood waste. The board target density was 0.7 g cm-3. The board was hot pressed at 170 ºC with specific pressure of 25 kgf cm-2, for 12 minutes. The composite boards resistance were tested according to Japanese Standard JIS K 1571:2004. Research results show that B8 type composite board (WBPI-MF were 1:4 and paraffin content of 8%) performed the best result compared to the other types. B8 type composite boards can be determined as the optimum conditions for the composite board production made of wood waste and corrugated carton.
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Judul: Ketahanan Papan Komposit dari Limbah Kayu dan Anyaman Bambu Betung (Dendrocalamus asper (Schult f.) Backer ex Heyne) Terhadap Serangan Rayap Tanah (Coptotermes curvignathus Holmgren).
Abstrak: Di masa mendatang bahan baku papan komposit sangat bervariasi sebagai akibat dari kekurangan bahan baku kayu yang diiringi dengan meningkatnya kebutuhan kayu oleh masyarakat. Pemanfaatan limbah kayu dan bambu sebagai bahan baku papan komposit merupakan salah satu alternatif pemecahan masalah kekurangan bahan baku kayu berkualitas tinggi. Seri penelitian pengembangan papan komposit dari limbah kayu dan anyaman bambu yang telah dilakukan selama tiga tahun terakhir oleh Massijaya & Hadi (2008) telah menunjukkan hasil yang sangat baik ditinjau dari sifat fisis dan mekanis. Namun demikian, ketahanannya terhadap faktor perusak biologis (rayap tanah) belum diketahui. Oleh karena itu, penelitian ini dirancang untuk menghasilkan papan komposit berkualitas tinggi ditinjau dari aspek ketahanan terhadap faktor perusak biologis (rayap tanah). Untuk mencapai tujuan tersebut, maka dilakukan modifikasi perekat yang digunakan serta penambahan parafin dalam proses pembuatan papan komposit.
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Judul: Pengaruh vaksinasi terhadap dinamika populasi pada model SIR (Susceptible-Infected-Recovered)
Abstrak: SIR model can be used to model the spread of diseases in a closed population based on certain assumptions. In this research, the SIR model is formulated by including the factor of vaccination. As the result, the model has been shown to have two equilibrium points, i.e. disease free and endemic equilibrium. A simulation study is carried out to illustrate the model. The results show that some equilibrium points are asymptotically stable. Moreover, a minimum level of vaccination has been defined. For the vaccination level less than the minimum level, increase in the vaccination level results in decrease of the proportion of infected individuals in the corresponding equilibrium point. On the other hand, for the vaccination level greater than the minimum level, increase in the vaccination level results in decrease the proportion of susceptible individuals in the corresponding equilibrium point. Furthermore, when vaccination level is greater than the minimum level, it is found that the time needed for the disease to extinct is shorter.
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