Judul: Sifat Fisis dan Mekanis Kayu Tumih (Combretocarpus rotundatus (Miq.) Danser) Asal Kalimantan Tengah
Abstrak: Tumih wood (Combretocarpus rotundatus) is a lesser known species which usually grows in secondary forest or forest with an open canopy that is flooded with peat water and swamp peat in Central Kalimantan. The purpose of this research was to analyze physical properties and mechanical properties of tumih wood for appropriate processing and utilization. The results showed the average value of oven dry density and specific gravity of tumih wood were 0.99 g/cm3 and 0.70. Its fresh and air dry moisture content content were 63.51% and 18.64% respectively. The volume shrinkage from fresh conditions to air dry and oven dry conditions were 3.36% and 6.85%respectively. The tangential and radial shrinkage were 6.38% and 3.59% respectively. So the T/R shrinkage ratio was 1.86 which showed that this wood had good dimensional stability. Permeability of longitudinal was about 1.2 times and 1.4 times of radial and tangential permeability respectively. The mechanical test results of MOE, MOR, and hardness of tumih wood were 106 131.80 kg/cm2, 551.31 kg/cm2, and 119.45 kg/cm2 respectively. Based on this mechanical properties tumih wood was classified strength class III which is good to be used as sills, door panel, window, furniture, parquet flooring and rung .
Keyword: Bogor Agricultural University (IPB), mechanical properties., physical properties, permeability, shrinkage, tumih wood

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: 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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