Judul: Aplikasi Bahan Finishing Pelarut Air dan Pelarut Minyak pada Lima Jenis Kayu Rakyat
Abstrak: Timber from community forest did not have a good appearance than natural forest. One of the method to repair this condition is finding a good finishing technique to this community timber, especially community timber for furniture. Global warming issue also influence the forest industry in Indonesia, especially the forest industry which export their product to Japan and Europe. Their product must have a little VOC (Volatile Organic Compound). This research investigated the application and characteristic from waterbased finishes and oil finishes on the five community timber. This research was conducted on Mei until November, 2011 in Improvement of Forest Product Quality Laboratory, Forestry of Faculty, Bogor Agricultural University. Finishing materials which is used in this research was Propan PU as oil finishes and Impra Aqua as waterbased finishes. The community timber which was used in this research is Akasia (Acacia mangium), Nangka (Artocarpus heterophyllus), Jati (Tectona grandis), Mindi (Melia azedarach), and Mahoni (Swietenia macrophylla). This sample board was distinguished by the flat sawn and quarter sawn, and wet water content and dry water content. This sample was made measuring 20 cm x 10 cm x 2 cm. Based on this research, spray gun is the best equipment to apply the Impra Aqua. In addition, Impra Aqua product is odorless and does not cause irritation of the eye. It means that it is safe for health and can be used in the process painting is easy to clean. However, the color of lacquer/top coat which is produced by using Aqua Lacquer is less shiny than using Poly Urethane Lacquer, yet both Clear Gloss. Endurance test sample of household chemicals, heat and cold well and taking Propan Poly Urethane or Impra Aqua did not show too differences because they both get into the classes 9-8. Sample taking Propan Poly Urethane is more resistant to attack soil termite (Coptotermes curvignathus Holmgren) than the sample using Impra Aqua because Propan Poly Urethane have strong odors that are not favored by soil termite (Coptotermes curvignathus Holmgren).
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Judul: Daya Tahan Lapisan Finishing Interior Pelarut Air pada Kayu Jati, Kamper, dan Pinus.
Abstrak: The limited supply of wood from natural forests makes markets interest to wood from plantation forest increase. However, the wood comes from plantation forests considered to be low in quality, including durability. Finishing is one of the solutions to overcome these problems. In this present day there has been developing water based finishing materials (waterbased finishes) that is safe for the environment and does not contain harmful chemicals that can threaten human health. A study has been conducted to determine the durability of the water based finishing layer (Impra Aqua and Sayerlack Waterborne) on Teak (Tectona grandis), Camphor (Dryobalanops aromatica), and Pine (Pinus merkusii). The type of testing conducted covers on the hot and cold test, resistance to household chemical materials, and cross-cut test. The test results showed that the finishing layer is resistant to the hot and cold test, thus can be classified into class 10 (with a completely unblemished surface). The Layer formed by Impra Aqua finishing material is also resistant to all household chemicals tested, so it is classified into class 10. Meanwhile the layer resistance of Sayerlack Waterborne finishing against ballpoint ink tend to be less powerful, so it is classified into class 9, but the finishing materials is resistant to chemicals such as Povidone-iodine. In the test results of paint adhesion (cross cut test), teak wood in wet conditions coated with both types of finishing materials has the weakest adhesion strength, so it is classified into class 3B. Meanwhile, finishing layer for all the wood samples under dry conditions have very strong adhesion, so it is classified in class 5B.
Keyword: Bogor Agricultural University (IPB), Sayerlack Waterborne, Impra Aqua, Hot and cold test, Cross cut test, Finishing, Waterbased

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