Judul: Basic properties, treatability, and finishing properties of tumih (combretocarpus rotundatus miq.) wood from central kalimantan
Abstrak: Penelitian ini bertujuan untuk menganalisis sifat dasar, keterawetan, dan finishing kayu tumih asal Kalimantan Tengah serta menganalisis pengaruh pengeringan awal dengan oven dan microwave terhadap sifat keterawetan dan finishing-nya. Hasil penelitian menunjukkan bahwa kayu tumih berwarna cokelat kemerahan, bertekstur kasar, berserat lurus, permukaan kayu mengkilap, dan bercorak. Pori-pori kayu tersusun dalam pola tata baur, didominasi oleh pori soliter meski dijumpai juga pori yang bergabung radial 2-3 sel. Diameter pori antara 68.50-510.90 μm dan berisi tilosis. Serat kayu tergolong kelas mutu III dengan panjang serat tergolong sedang (1338.39 μm). Kayu tumih lebih disarankan sebagai bahan baku mebel karena memiliki penampilan yang dekoratif, disamping sebagai bahan konstruksi (kelas kuat II; berat jenis = 0.63). Hasil uji keterawetannya memperlihatkan bahwa kayu tumih sukar diawetkan karena retensinya hanya 1.67-2.93 kg m-3 dan penetrasinya 13.22-40.66% atau 2.99-8.50 mm. Sifat finishing-nya tergolong baik (Grade 4B; ASTM D3359-02). Hasil uji finishing ini tidak dipengaruhi secara nyata oleh perlakuan cara pengeringan awal dan pengawetan borax yang diberikan., Tumih wood is a lesser-known wood species that has been used as construction material limitedly in some areas of Borneo Island. This study aimed to analyze the basic properties, treatability, and finishing properties of tumih wood and to analyze the influence of initial drying using oven and microwave to wood’s treatability and finishing properties. The result showed that tumih wood has reddish-brown colour, rough-texture, straight-grain, lustrous, and decorative. Pore distribution is diffuse, dominated by solitary but sometimes in radial-multipled of 2-3 cells. Pore diameter ranged between 68.50-510.90 μm, and contained tylosis. Its fiber was classified as quality class III and had medium length (1338.39 μm). The specific gravity of tumih wood was 0.63 that belongs to strength class II. Tumih wood is suitable for furniture manufacturing. Based on this study, the treatability of this wood was difficult because the preservative retention and penetration were 1.67-2.93 kg m-3 and 13.22-40.66% or 2.99-8.50 mm, respectively. Its finishing property was good (Grade 4B) based on ASTM D3359- 02, which was not affected by pre-drying treatment and borax preservation.
Keyword: anatomi, Combretocarpus rotundatus, finishing, keterawetan, tumih

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: 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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