Judul: Identifikasi Faktor Penentu Keberhasilan Pelepasliaran Elang Ular Bido (Spilornis cheela Latham, 1790) di Cagar Alam Takokak
Abstrak: Crested serpent eagle is one of raptor species which it existence is threatened by illegal hunting, trading, and habitat degradation. Information about releasing process still categorized as few. This research is conducted at Cikananga Wildlife Center and Takokak Nature Reserve for identifying process and determining factor which decisive for successfull release of crested serpent eagle. Based on this research, crested serpent eagle release phase consist of rehabilitation, transportation, habituation, release, and post release monitoring. Several factors which determine successfull rate of crested serpent eagle release are health aspect, behavior aspect, stress caused by transporting, using of precise release technic, adaptation effort, and survival rate. Crested serpent eagle which released at Takokak nature reserve were able to recognize forest provision, hunt and search for own meal, also avoid human activities.
Keyword: takokak nature reserve, release, crested serpent eagle

Judul: Penggunaan Habitat Koridor Halimun Salak oleh Elang ular bido (Spilornis cheela Latham, 1790) di Taman Nasional Gunung Halimun Salak
Abstrak: Crested serpent eagle is one of the raptor species in Indonesia which has protected by the Indonesian law. The population threatened due to habitat looses caused by forest degradation. The initial step could be done to preserve the species through study of the habitat use based on habitat functions, such as cover and food supply. Beside habitat functions, it was also identified the supporting functions, such as slope, altitude, and distance from source of disturbances in Halimun Salak Corridor, Mount Halimun Salak National Park. The research conducted in April-June 2013 through point count method. Based on field observation, it was identified that habitat function at forest cover can be as resting area and nesting site. The eagle hunted in forest and open area such as horticultural fields, rice fields, and shrubs near the forest. Values of the supporting functions selected by crested serpent eagle was in open area near the forest.
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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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