Judul: Basic- and processing properties of maniani (Flindersia pimenteliana F. v. Muell) wood from wondama bay, West Papua
Abstrak: Basic- and processing properties of Flindersia pimenteliana F. v. Muell woods from natural forest in Wondama Bay, West Papua were studied comprehensively in order to analyze its proper utilization. The study was carried out by following standards of Deutsche Institute Fuer Normung (DIN), Bristish (BS), Technical Association of Pulp and Paper Industry (TAPPI), Indonesia (SNI) and American Society for Testing and Materials (ASTM). The results showed that maniani wood has decorative figure, white sapwood to pinkish and reddish brown heartwood, fine texture, straight grain, lustrous, good smell, moderately soft and light. Its fiber was classified in to class II. Green moisture content was 57.00% and specific gravity was 0.61, while tangential and radial shrinkages were 2.48% and 1.21%, respectively. MOE was 108839.40 kg cm-2, while MOR, compressive strength parallel to grain, hardness, shear strength, tension- and cleavage strengths were 817.43 kg cm-2, 426.33 kg cm-2, 435.75 kg cm-2, 135.71 kg cm-2, 111.60 kg cm-2 dan 16.96 kg cm-2, respectively. The extractives content in cold water, hot water, NaOH 1% and ethanol benzene were 4.82%, 7.17%, 16.42%, and 4.30%, respectively. The contents of holo-cellulose, α-selulosa, lignin, ash and silica were 82.91%, 45.54%, 24.74%, 0.50% and 0.15%, respectively. Natural resistances to subterranean termite, dry-wood termite and decay fungi were classified into V (poorly resistant), I (very resistant) and II (moderately resistant), respectively. Preservative application treatment using cold soaking method showed that its retention was 0.97 kg m-3, while penetrations of copper and boron were 0.72 mm dan 3.69 mm, respectively. The wood was good in drying quality with temperature of 50 ºC – 80 ºC and RH 80% – 30%. Properties of planning, turning and boring were good, while moulding and sanding properties were very good. Finishing properties were generally good except for resistance to soap solution and sauce. Based on these properties studied, it could be recommended that maniani wood is suitable for wood craft, furniture, mouldings and interior construction purposes.
Keyword: Flindersia pimenteliana F.v. Muell, wood properties, wood processing properties, wood utilization

Judul: Sifat Dasar dan Sifat Pengeringan Tiga Jenis Kayu Kurang Dikenal Asal Hutan Alam Papua
Abstrak: One of serious problems which is commonly complained in wood industries is wood drying process because of long time and frequent deformation and checks. So, wood drying is an imperative process in wood industries. Indonesia has about 4 000 wood species, but only a few of these woods are well known in their properties and uses. Wood drying property is influenced by physical and anatomy properties of different woods. The objective of this research was to reveal the physical properties, anatomy and drying properties of three lesser known wood species from natural forests in Papua, namely briya hatam (Rhustaitensis guild) pala hutan (Gymnacranthera paniculata), and ketapang (Terminalia complanata) with respective families comprising Myristicaceae, Anacardiaceae and Combretaceae. These basic properties and drying property were beneficial direction on determining their uses. The physical properties of woods included moisture content, specific gravity and shrinkage. The anatomy of wood was observed based on their structures while wood drying test included drying rate, defects evaluation, and drying schedule. The results of research showed that specific gravity and the anatomy of wood structure influenced the wood drying property. All the three wood species were difficult to be dried. Briya hatam with the higher specific gravity (0.52) had more drying defects than pala hutan and ketapang whose specific gravity 0.47 and 0.38 respectively. According to the drying test and basic properties of woods, the proper drying schedule (temperature and humidity) for briya hitam, pala hutan and ketapang were 4580 0C and 9028%; 5080 0C and 8530%; 5080 0C and 90 – 28% respectively.
Keyword: lesser known species, wood anatomy, wood drying properties, physical properties, wood

Judul: Dynamical System of Hepatitis B in Three Groups with Vaccination
Abstrak: The aim of this study is to modify the hepatitis B transmission model in three age groups involving vaccination from the model conducted by Zhoe and Zhang.The method used is to analyze the stability of the fixed point and its basic reproduction number (R_0). Performed stability analysis and numerical simulation to see population dynamics. Next, a sensitivity analysis of the parameters was carried out to see its effect on R_0. From the analysis obtained two fixed points, namely non-endemic and endemic fixed points. Non-endemic fixed points are locally asymptotically stable if R_0 <1 Meanwhile, the endemic fixed point is locally asymptotically stable if R_0 > 1. Hepatitis vaccination affects the number of susceptible population, because the more successful the vaccination, the smaller the number of susceptible populations so that the smaller the population will be infected.
Keyword: Dynamic, Hepatitis B, Vaccine, Mathematical model