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 Delapan Jenis Produk Kayu Komposit terhadap Serangan Rayap Tanah (Coptotermes curvignathus Holmgren)
Abstrak: Wood composite products are potential products which are able to be utilized for structural and non-structural functions. However, wood composite needs resistant to subterranean termites attack because of the climate condition in Indonesia supporting the growth of these termites. The objective of this research was to analyze the resistance of eight wood composite products against subterranean termite. Wood composite products comprised of a medium density fiberboard with and without PVC coating, laminated veneer lumber (LVL), particleboard, corrugated board, plywood, MDF treated with anti termites, and treated rubberwood. Method used in this research was based on modified JIS K 1571-2004. Resistance class of plywood and medium density fiberboard (MDF) treated with anti-termite were classified into the first resistance class, which the weight losses were classified into 3.47% and 2% respectively. Rubber wood treated with boric acid treatment was classified into the second resistance class, where the weight loss of this product was 6.13%. In addition, LVL and particleboard were classified into the fourth resistance class, where the percentage of weight losses were 12.21% and 12.28% respectively. However, corrugated board, MDF with or without PVC linings were the worst (fifth) resistance class, which their weight losses percentage were 26.97%, 19.92%, and 19.80% respectively.
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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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