Judul: Potensi dan Pemanfaatan Tumbuhan Berguna Di Cagar Alam Bojonglarang Jayanti Kabupaten Cianjur Jawa Barat
Abstrak: Bojonglarang Jayanti Nature Reserve is a protected area which has various ecosystem including lowland forest, and land processed forest. This research purposes are to identify the potency of useful plant and the utilized plants by the local people. The methode of research wash conducted by vegetation analysis and snowball sampling technik for interview. The calculation of vegetation analysis in every forest formation has the diversity index > 1,5 and evenness > 0,5 in every growth level. The vegetation analysis of useful plant potency wich is ±83% identified or 128 species from 154 species that belong into 57 families. People utilization of herb, there are 130 species that belong into 51 families. Mostly those plants are utilized as medicine, housing material, and food.
Keyword: Bogor Agricultural University (IPB), society, plants potency, Bojonglarang Jayanti nature reserve

Judul: Etnobotani dan potensi tumbuhan berguna di Taman Nasional Gunung Ciremai, Jawa Barat
Abstrak: The people around TNGC have a very close interaction with the surrounding natural resources as can be seen when they deal with the use of plants (ethnobotany). Documenting the people‟s knowledge in TNGC ethnobotany is especially important so that the knowledge of TNGC people in the use of these plants can be preserved. This study aimed to identify the use of plants by the people around TNGC (etnobotany) and to find out the potential of useful plants in the TNGC region. Ethnobotany study was conducted by interviews and the potential of useful plants in the TNGC region was learned through a vegetation analysis. The number of species obtained from the ethnobotany results was 131 species and 62 families. Medicinal plants were among the much used reaching 37 species. The number of spesies obtained from the results of vegetation analysis was 99 plant spesies and 43 families residing in the TNGC area. The most useful plant species were plants producing buildings as many as 14 species. Out of 131 plant that were used by community, many them were not be found in the area of TNGC reached 113 species, whereas plants that were aas many as 18 species. Of all the plants obtained from the ethnobotany results and vegetation analysis, 10 superior species can be develoved by communities around the TNGC area, for example, nilam (Pogostemon cablin) as aromatic material and raw material for the manufacture of perfume and ground orchids with yellow flowers (Phaius flavus ) for ornamental plants. These superior species if well-cultivated are expected to help TNGC community improve their income.
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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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