Judul: Kajian Etnobotani Masyarakat Kasepuhan Sobang di Kabupaten Lebak, Banten
Abstrak: Ethnobotany is one tool to discover many plants which are used by traditional community to support their livelihood. This research is aimed to investigate knowledge of local communities in managing biological resources, diversity, the way of using and proliferating that plants. The data were obtained through participant observation method and semi-structured interviews of 38 respondents by using an interview guide and questionnaire. Data of plant diversity was obtained through sampling and identification of plant species. There were 203 species (classified into 70 families) used by Kasepuhan Sobang communities. The most useful plant for traditional communities belongs to Fabaceae. The most utilization of plant diversity was as source of food (93 species, 39.74 %) and medical plant species (54 species, 23.07 %). Most of the plants were taken from the gardens and used immediately. Leaves were the largest part of plant that used to support communities livelihood, most of the plants are harvested monthly. The application of ethnobotany knowledge in Sobang Kasepuhan society in managing forest was demonstrated by dividing zone Kasepuhan Sobang into several utilization areas.
Keyword: traditional knowledge., local wisdom, leuweung tutupan, kasepuhan sobang, ethnobotany

Judul: The Ethnobotany of Bunaq Ethnic Community (Case Study at Dirun Village, Lamaknen Subdistrict, Belu Regency, the Province of East Nusa Tenggara).
Abstrak: The traditional life of community has close relation to the naturalresources and environmental. One of their interactions is related of the plants utilization. This interaction is an experience from traditional knowledge which has been inherited by the ancestors, generation to generation. That knowledge is lather developed by adapting to the environmental in order to keep the survival. This study is aimed to understand and explore traditional knowledge of Bunaq ethnic in using plants The result of this study hopefully can be information material to the development, utilization and preservation of useful plants sustainably and based on local wisdom. This study was conducted at Dirun Village, Lamaknen Subdistrict, Belu Regency, the Province of East Nusa Tenggara during 2 months, July to September 2009. The material that used in his study were documents, report from certain institutions, herbarium, alcohol 70%, while the tools that used were camera, secondary newspapers, plastics, wattle, tally sheet, questioner, tape recorder, label and stationary.
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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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