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: 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: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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