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: Strategi pengembangan sumber benih mindi (Melia azedarach L.) pada hutan rakyat di Provinsi Jawa Barat
Abstrak: Melia azedarach L. or mindi (local name) is one of the widely planted exotic species in Indonesia, mostly found in community forests in West Java. It is still an urgent need for improvement of mindi plantation productivity, especially in community forest in West Java. One of the factors that affect forest productivity is high quality seed, but seed quality is not easily obtained by farmers. For this it is necessary to carry out a strategies which can support the development of seed sources in the community forest. The general objective of this research is to formulate development strategies of mindi seed sources in the community forest in West Java, while specific purposes of this study are to (1) determine the genetic and morphology diversity of mindi in the community forest in West Java, (2) improve seed pre-treatment to develop the seed viability of mindi, and (3) analyze of socio-economic and institutional aspect of farmers, to support the development of the seed sources. Six populations of mindi plantation in the community forests were chosen for this research. i.e Nagrak village (Bogor); Megamendung (Bogor); Hamlet of Gambung (Bandung); Wanayasa subdistrict (Purwakarta); Padasari village (Sumedang) and Babakan Rema village (Kuningan). RAPD markers were used to assess the genetic variation, while various pre-treatments employing chemical and physical methods were tested to improve seed viability and vigor. SWOT analysis was used to evaluate the capacity of farmers in developing seed source. The results showed that the genetic variation of mindi in community forests in West Java was moderate ranging from He = 0.1603-0.1956. With respect to seed treatment, the use of sulfuric acid (95%) increased the viability of seed by 57% over control, especially seed from Padasari (Sumedang) population. Prospective populations to be developed for seed sources were proposed namely Padasari (Sumedang) and Legok Huni (Purwakarta). Evaluation of socio-economic and institutional aspect in these two location showed that generally farmers have the sufficient capacity to manage community forests. Four strategies that can be used to develop seed sources of mindi in community forest in West Java : i.e 1. The strategy based on utilization of plant genetic resources of mindi to increase seed production in order to meet the need of mindi timber market. 2. The strategy based on market and networking opportunities to improve the quality of mindi seeds . 3. The strategy based on capacity building and institutional development of farmers in the cultivation of mindi. 4. The strategy based on increasing farmers' interest in cultivation of mindi In conclusion, effective strategy of mindi seed source development should emphasize following important considerations such as the utilization of exisiting genetic resources, enhancement of institutions and networks as well as optimizing opportunities in mindi timber markets.
Keyword: Benih Mindi, Melia azedarach L., Hutan Rakyat, Jawa Barat

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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