Judul: Keawetan Alami Kayu Tumih (Combretocarpus rotundatus Miq Danser) dari Serangan Rayap Kayu Kering, Rayap Tanah dan Jamur Pelapuk Kayu
Abstrak: Combretocarpus rotundatus Miq Danser or tumih is known as one of the fast growing species in the peat forests. Tumih wood has a straight trunk that could potentially be a good wood working materials, but there are no studies that describe the natural durability of wood tumih. The objective of this study was to test the natural durability of wood tumih from dry wood termites Cryptotermes cynocephalus Light, subterranean termites Coptotermes curvignathus Holmgren, decay fungus Schizophyllum commune, as well as its field natural durability in the grave yard test. Observed variables in this study were the percentage of termite mortality and weight loss of samples due to termites and fungal attacks. The result showed that the durability of tumih wood was not the same for all wood destroying factors. The natural durability of tumih wood belong to class III of C. cynocephalus, class II of C. curvignathus and class IV of decay fungus S. commune.
Keyword: Bogor Agricultural University (IPB), Schizophyllum commune., grave yard test, Cryptotermes cynocephalus Light, Coptotermes curvignathus Holmgren, Combretocarpus rotundatus Miq Danser

Judul: Keawetan Alami Beberapa Jenis Kayu Indonesia Kurang Dikenal dari Kampus IPB Dramaga terhadap Serangan Rayap
Abstrak: The objective of this research was to evaluate the natural durability of Nine Indonesian lesser known species against subterranean termite (Coptotermes curvignathus Holmgren) and dry wood termite (Cryptotermes cynocephalus Light) attacked grown in Dramaga campus Bogor Agricultural University. Sap and hearth woods from nine wood species namely mangium (Acacia mangium Wild), durian (Durio zibethinus), nangka (Arthocarpus heterophyllus), angsana (Pterocarpus indicus), afrika (Maesopsis eminii Engl), rukam (Flacourtia rukam Zoll), trembesi (Samanea saman (Jacquin) Merrill), bisbul (Diospyros discolor Willd), and ki sampang (Evodia latifolia Dc) were used in this experiment. Evaluation of natural durability of wood against termite attacked referred to SNI 01.7207-2006. The results indicated that the weight loss of wood after baited to C.curvignathus and C.cynocephalus were varied among species and positioning wood (sap and hearth woods). It was observed that hearth wood part of nangka wood was the most durable wood against C.curvignathus attacked and it was classified into 2nd class. bisbul, rukam and trembesi woods both sap and hearth wood part and heart wood of angsana wood were classified into 3rd class. mangium and afrika woods both sap and hearth wood parts were classified into 4th class. Ki sampang and durian woods both sap and hearth wood parts and sap wood part of nangka and angsana woods were classified into 5th class. Sap wood part of rukam wood was the most durable wood against C.cynocephalus attacked and it was classified into 2nd class. Bisbul, mangium, ki sampang, afrika, nangka, durian, angsana and trembesi woods both sap and hearth wood parts and heart wood part of rukam wood were classified into 3rd class.
Keyword: hearth wood, sap woodd, subterranean termite, dry wood termite, natural durability

Judul: A Continuous Vaccination Strategy in the SVIR Epidemic Model
Abstrak: Vaccination is conducted to minimize the spread of a disease. The vaccination is usually done several times within a fixed time interval. In the SVIR model, it is assumed that individuals do not get immediate immunity following a vaccination program. So according to process of vaccination on SVIR model, there are two strategies, i.e. the continuous vaccination strategy (CVS) and the pulse vaccination strategy (PVS). In this study, only the CVS strategy in epidemic model SVIR is considered. Results of the study indicate that dynamics of the CVS system depends on the basic reproductive number. If the basic reproductive number is less than one, then the disease-free fixed point is asymptotically stable. It means that the disease will eventually disappear from the population. Conversely, if the basic reproductive number is greater than one, then the endemic fixed point is asymptotically stable, which means that the disease will remain exist in the population. Simulation result shows that the vaccination would minimize the spread of disease by reducing the basic reproductive number. If the time for the vaccinated recipients to obtain the immunity, as well as a possibility of vaccinated recipients to be infected are neglected, then the disease will be eradicated. This condition is called an over-evaluating effect of vaccination.
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