Judul: Identifikasi Nilai Konservasi Tinggi Keanekaragaman Hayati di Kampus Institut Pertanian Bogor Darmaga Jawa Barat
Abstrak: The research was conducted in Bogor Agricultural University Campus, located in Darmaga, Bogor, West Java, that has higher value of biodiversity compared to other areas surrounding. The research was aimed to identify areas that have high conservation value of biodiversity in the location studied. The study was carried out from Februari to April 2012. Primary data were collected from direct survey, and the secondary data were obtained from interview and literature study. Among total ± 256,97 hectares of IPB Campus area, the study identified about 65,11 hectares (25,34 %) of the areas having high conservation value, such as Riparian of Cihideung and Ciapus River, Sengon Forest near Rectorat building, Al-Huriyah forest, Cikabayan forest, LSI Lake (Situ Leutik), Forest near Sylva dormitory, Arboretum of Forest Faculty, and Arboretum of Tropical Forest .
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Judul: Keanekaragaman Spesies Tumbuhan Langka dan Sebarannya di Kampus IPB Darmaga
Abstrak: Various vegetation cover in IPB Darmaga Campus makes this place has plenty kinds of plants including naturally and wildly grown plants. Some of the plants are included as rare plants species. The rare plants species are potential to be utilized as media for conservation education. However, there’s no research yet about those rare plants and its distribution in IPB Darmaga Campus. The purpose of this research was to identify, determine the distribution, and document the history of rare plants species in IPB Darmaga Campus. Based on this research, there were 30 rare plants species from 18 families. Dipterocarpaceae was recorded as the dominating family. These rare plants species were dominated by tree habitus and were distributed in the whole area of IPB Darmaga, but mostly found in Faculty of Forestry area. These species were mostly planted by lecturers and alumni of Faculty of Forestry, Bogor Agricultural University (IPB). The purpose is for collection and student learning media.
Keyword: Bogor Agricultural University (IPB), rare plants species, IPB Darmaga Campus, conservation education

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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