Judul: Inventarisasi Informasi untuk Mendukung Budidaya dan Pemanfaatan Pohon Kayu Putih (Melaleuca cajuputi Powell) di Indonesia
Abstrak: Kayu putih (Melaleuca cajuputi Powell) merupakan salah satu jenis pohon yang memiliki banyak manfaat terutama pada olahan minyak atsiri. Minyak atsiri diperoleh dengan cara disuling daunnnya. Penelitian terkait pohon kayu putih telah banyak dilakukan, tetapi belum terdata dengan baik, sehingga tidak diketahui aspek apa yang telah diteliti secara lengkap dan aspek apa yang kurang. Penilitian ini bertujuan untuk mendapatkan informasi jumlah dan sebaran aspek penelitian terkait pohon kayu putih di Indonesia dan menganalisis kecukupan informasi tentang pohon kayu putih untuk mendukung pengembangan hutan tanaman kayu putih di Indonesia. Berdasarkan hasil inventarisasi penelitian tentang pohon kayu putih di Indonesia, terdapat total 73 publikasi. Hasil tersebut dibagi kedalam 8 aspek, yaitu perbenihan, persemaian, penanaman, pemeliharaan, pemuliaan, pemanenan, manfaat dan produksi. Dari hasil penelitian ini dapat disimpulkan bahwa penelitian-penelitian terkait pohon kayu putih belum mencakup 8 aspek yang dikaji dan belum memenuhi kebutuhan untuk pengembangan hutan tanaman kayu putih di Indonesia., Kayu putih (Melaleuca cajuputi Powell) is one type of tree that has many benefits, especially in the producing of essential oils. Essential oils are obtained by distilling the leaves. There have been many studies related to kayu putih trees, but they have not been well recorded, so it is not known what aspects have been studied in full and which aspects are lacking. This study aims to obtain information on the number and distribution of research aspects related to kayu putih trees in Indonesia and to analyze the adequacy of information about kayu putih trees to support the development of kayu putih plantations in Indonesia. Based on the results of an inventory of research on kayu putih trees in Indonesia, there are a total of 73 publications. The results are divided into 8 aspects, namely seeding, nursery, planting, maintenance, breeding, harvesting, benefits, and production. From the results of this study, it can be concluded that studies related to kayu putih trees have/have not covered the 8 aspects studied and have not fulfilled the need for the development of kayu putih plantations in Indonesia.
Keyword: Aspect, Kayu putih, Kayu putih oil, aspect, kayu putih, kayu putih oil

Judul: Model produksi daun pada hutan tanaman kayu putih (Melaleuca cajuputi subsp. cajuputi Powell)
Abstrak: Cajuput oil is one of important non-timber forest product in Indonesia, which is resulted from processing of kayu putih (Melaleuca cajuputi Subsp. cajuputi Powell) leaves. Perum Perhutani now managed about 24,000 hectars of kayu putih plantation in Java and 10 units of leaves processing mills with installed capacity of 53,760 tonnes per year. However, these mill were underutilized due to low leaves kayu putih production. The objective of this study were: (1) to develop kayu putih leaves production model, for one leaves harvesting rotation, and (2) to determine a silviculture rotation age of kayu putih stand. Subject to field condition, number of tree, stand density, and biomass by part of tree from 36 temporary sample plot (TSP) of Age Class II at BKPH Sukun were them measured to develop kayu putih leaves production model and from 24 TSP of all Age Class (Age Class I – VIII) at BKPH Sukun were measured to determine a silviculture rotation age. Anaysis of oil and and sineol contens as well as some characteristics of cajuput oil were also conducted. The result show that Morgan-Mercer-Flodin (MMF) equation was found as the best model in representing kayu putih leaves production model, with option sprout age of 7 months. A silviculture rotation age was estimated around 25 years (with Age Class V) using as stand maximum productivity as a proxy.
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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