Judul: Komposisi Jenis dan Struktur Agroforestri Mindi (Melia azedarach Linn.) di Desa Selaawi Kecamatan Talegong, Kabupaten Garut.
Abstrak: Agroforestri salah satu teknik menggunakan dan mengelola lahan dengan menggabungkan tanaman pertanian dan kehutanan. Mindi merupakan jenis tumbuhan yang cepat tumbuh sangat menyukai cahaya, agak tahan terhadap kekeringan dan toleran terhadap salinitas tanah. Tujuan penelitian ini mengidentifikasi komposisi dan struktur agroforestri mindi pada enam unit lahan dan membandingkan keanekaragaman jenis yang terdapat pada satu unit lahan dengan unit lahan yang lain. Metode pengambilan data di lapang dilakukan dengan membuat plot berukuran 20 m x 100 m yang dibagi ke dalam 5 subpetak berukuran 20 m x 20 m. Hasil penelitian menunjukkan bahwa pola agroforestri yang digunakan beragam dengan komponen penyusun yaitu tanaman pertanian dan tanaman MPTS (Multi Purpose Tree Species). Komposisi jenis yang dihasilkan dari keenam lahan penelitian menghasilkan lahan 4, 5, dan 6 merupakan lahan dengan jumlah jenis yang paling banyak ditemukan dengan jenis yang mendominasi ialah jenis tanaman mindi (Melia azedarach) dan kayu afrika (Maesopsis eminii). Struktur horizontal dengan kerapatan tertinggi dihasilkan pada lahan 6 sebesar 840 individu/ha dengan diameter > 10 cm dan kerapatan terendah pada lahan 3 yaitu 10 individu/ha dengan diameter > 5 cm. Struktur vertikal nilai dari kerapatan semakin menurun dari kelas tinggi > 5 m menuju kelas tinggi pohon > 10 m.
Keyword: agroforestri, dominasi jenis, mindi, tanaman pertanian, tanaman pokok

Judul: Local Knowledge Agroforestry System for Mindi (Melia azedarach L. (Case Study in Selaawi Village, Talegong Subdistrict, Garut, West Java)
Abstrak: Melia azedarach L. is one of the fast growing species which is potential to be developed in community forests. This species is found to occupy most agroforestry lands in Selaawi village (Garut, West Java). Research was conducted in three stand types, namely: (i) pine stand (as reference), (ii) old growth mindi stand, (iii) young growth mindi stand with objectives to: (1) determine site quality of mindi agroforestry, (2) explore the local knowledge on silvicultural techniques of mindi agroforestry, (3) fomulate the strategies for development of mindi agroforestry and determine the genetic and morphology diversity of mindi in Selaawi Vilaage. It was found that site quality in young growth mindi stand was better than that of pine stand and old growth mindi stand. There are several tree species dominating the sites, namely M. azedarach L. (43,37%), Paraserianthes falcataria (23,20%), Maesopsis eminii (15,35%), Manglieta glauca (9.83%), Eucalyptus spp (4,68%), Anthocephalus cadamba (1,62%) and other wood species (1,96%). Local knowledge of mindi agroforestry includes seed procurement, plant propagation, land preparation techniques etc which may be practiced also in other regions. Information obtained from this research could be used to formulate appropriate strategies for sustainable agroforestry management. Microsatelit marker were used to assess the genetic variation. The results showed that the genetic variation of mindi in Selaawi Village was high ranging from He 0,379-0,439.
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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