Judul: Karakteristik Pengeringan Kayu di Industri Mebel Kabupaten Jepara Jawa Tengah
Abstrak: Wood drying is an imperative process on producing exported wood furniture in Jepara. The process tends to be based on local characteristics. The objectives of this research were to understand characteristics of wood drying to finished wood products; and to understand benefits and drawbacks of wood drying based on local wise. The methods used were literature study and field research. Field research was conducted in nine furniture industries of Jepara Regency and in Wood Drying Laboratory, Forest Products Department, Faculty of Forestry, IPB. Wood drying methods used in Jepara’s furniture industries were commonly air drying, kiln drying and smoked wood. The average of the exported wood furniture moisture content was about 8.5 % - 11.2 %. The longest drying time average for air drying, smoked drying and kiln drying were respectively 20 days, 19 days and 12 days. The percentages of drying defects of air drying, kiln drying, and smoked wood were 21.4 %, 100 %, 100 %, respectively. Wood drying quality of Perum Perhutani teak, community teak and mahogany wood included good enough quality
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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