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: Habitat Suitability Level of Crested  serpent eagle (Spilornis cheela Latham, 1790) in Halimun Salak Corridor
Abstrak: Deforestasi telah menyebabkan kerusakan habitat dan mengancam kelestarian elang ular bido. Kesesuaian habitat yang tersisa untuk elang ini belum diketahui, oleh karena itu dibutuhkan kajian lebih lanjut. Tujuan penelitian adalah menganalisis faktor yang mempengaruhi kesesuaian habitat elang ular bido dan menganalisis tingkat kesesuaian habitatnya di Koridor Halimun Salak. Penelitian dilakukan pada bulan Maret hingga Juli 2014. Pengamatan elang dilakukan dengan metode point count. Peubah habitat berupa ketinggian tempat, kemiringan lahan, kerapatan tajuk, suhu permukaan, serta jarak dari pemukiman, jalan, tepi hutan, sungai dan elang lain, diidentifikasi berdasarkan data spasial. Analisis Komponen Utama digunakan untuk menentukan peubah utama yang mempengaruhi kesesuaian habitat. Peubah utama yang mempengaruhi kesesuaian habitat ialah ketinggian tempat dari permukaan laut (x1), jarak dari sungai musiman (x2), jarak dari sungai permanen (x3), suhu permukaan (x4), kemiringan lahan (x5) dan jarak dari pemukiman (x6). Skor Kesesuaian Habitat yang diperoleh yaitu SKH = 0.849 x1 + 0.846 x2+ 0.748 x3 – 0.871 x4 + 0.810 x5 + 0.719 x6. Wilayah Koridor Halimun Salak dibagi menjadi kesesuaian habitat rendah (27%), kesesuaian sedang (38%) dan kesesuaian tinggi (35%). Berdasarkan fungsi perlindungan dan pakan, Koridor Halimun Salak masih dapat mendukung keberlangsungan hidup elang ular bido.
Keyword: elang ular bido, kesesuaian habitat, Koridor Halimun Salak, peubah habitat

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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