Judul: Studi Habitat dan Perilaku Burung Pemangsa Famili Accipitridae di SPTN 1 Tegaldlimo Taman Nasional Alas Purwo, Jawa Timur
Abstrak: Accipitridae merupakan jenis raptor yang dilindungi Peraturan Pemerintah No.7 Tahun 1999. Taman Nasional Alas Purwo (TNAP) merupakan salah satu kawasan konservasi yang memiliki habitat alami Accipitridae di Indonesia. Penelitian ini bertujuan untuk menganalisis karakteristik habitat dan perilaku harian Accipitridae. Habitat yang paling sering digunakan Accipitridae adalah hutan alam dataran rendah. Karakteristik tempat istirahat Accipitridae adalah pohon strata A sebagai emergent tree, strata B hingga C, cabang mendatar yang kuat. Karakteristik areal buru Accipitridae yaitu hutan alam dataran rendah dengan potensi mangsa yang beragam dan melimpah. Accipitridae memangsa mamalia seperti jelarang, burung berukuran kecil hingga sedang seperti ayam hutan dan herpetofauna. Karakteristik tempat sarang Accipitridae adalah pohon strata A sebagai emergent tree, strata B. Aktivitas elang jawa, elang brontok dan elang-ular bido yang paling sering teramati adalah istirahat dengan persentase masing-masing sebesar 58.06%, 58.75% dan 40.35% sedangkan elang laut perutputih paling sering teramati terbang (81.40%)
Keyword: accipitridae, habitat, perilaku

Judul: Pengelolaan Lanskap Untuk Kegiatan Wisata Birdwatching Elang Jawa (Nisaetus bartelsi) Di Taman Nasional Alas Purwo
Abstrak: Elang Jawa (Nisaetus bartelsi) merupakan raptor endemik Pulau Jawa yang terancam punah. Elang jawa tersebar di hutan dataran tinggi dan hutan dataran rendah. Taman Nasional Alas Purwo (TNAP) merupakan habitat elang jawa di hutan dataran rendah. Elang jawa merupakan satwa kunci TNAP yang harus ditingkatkan upaya konservasinya. Wisata birdwatching merupakan cara konservasi elang jawa di TNAP dengan pemanfaatan berkelanjutan. Tujuan penelitian ini adalah pemetaan perjumpaan elang jawa dan menganalisis karakteristik preferensi habitat berburu dan habitat bersarang, menganalisis potensi pengembangan wisata birdwatching elang jawa, dan memberikan rekomendasi pengelolaan lanskap untuk kegiatan wisata birdwatching elang jawa. Data dikumpulkan dengan teknik observasi habitat berburu dan bersarang, literatur, wawancara pengelola, dan kuisioner pengunjung yang digunakan untuk analisis lanskap, analisis vegetasi, analisis pohon sarang, dan analisis SWOT. Hasil menunjukan elang jawa ditemukan di Seksi Pengelolaan Taman Nasional (SPTN) 1 Tegaldlimo dan SPTN 2 Muncar dengan pemanfaatan hutan alami yang tinggi. Kondisi habitat bersarang dan berburu ditemukan pada slope datar hingga curam dengan elevasi 0-167 mdpl serta sekitar sarang ditemukan sungai. Vegetasi pakan mangsa elang jawa strata A dan B dengan keragaman sedang ditemukan pada habitat berburu dan bersarang. Bendo (Arthocarpus elastica) menjadi pohon sarang karena memiliki model arsitektur rauh, strata A, dan emergent tree. TNAP memiliki potensi mengembangkan wisata birdwatching elang jawa. Namun, dengan kondisi fasilitas kurang mendukung dan infromasi terbatas. Kondisi tersebut menghasilkan rekomendasi berupa perencanaan wisata birdwatching elang jawa, restorasi habitat menggunakan preferensi vegetasi di TNAP, melakukan promosi dengan berbagai media, serta bekerjasama dengan stakeholders terkait., Javan Hawk-Eagle, JHE (Nisaetus bartelsi) is an endemic raptor in Java Island with endangered status. JHE are spread in highland forests and lowland forests. Alas Purwo National Park (APNP) is JHE habitat in lowland forests. JHE is a key animal in APNP must be improved in conservation efforts. Birdwatching is way of JHE conservation in APNP with sustainable use efforts. Purpose of this study was to map JHE encounters and analyze the characteristics of hunting and nesting habitat preferences, analyze the potential for developing JHE birdwatching tourism, and provide recommendations landscape management for JHE birdwatching tourism. Data obtained from observations in hunting and breeding habitats, literature, interviews to maintener, and questionnaires to tourists which were used for landscape analysis, vegetation analysis, nest tree analysis, and SWOT analysis. The results is JHE was found in the National Park Management Section (NPMS) 1 Tegaldlimo and NPMS 2 Muncar with high utilization of natural forests. Nesting and hunting habitat were found at 0-167 MASL and flat to steep slopes and around the nest found river. Prey vegetation of JHE has strata A and B was found in hunting and nesting habitats with moderate diversity. Bendo (Arthocarpus elastica) were a nest tree because it had an rauh architecture model, strata A, and emergent tree. TNAP has potential to develop JHE birdwatching tourism. However, the condition of facilities was not supportive and information was limited. These condition resulted recommendations in the form of planning JHE birdwatching toursim, Habitat restoration using vegetation preferences in APNP, promotions with various media, and collaborating with related stakeholders.
Keyword: Breeding Habitats, Habitat Preference, Hunting Habitats, Lowland Forest, Nisaetus bartelsi., Breeding Habitats, Habitat Preference, Hunting Habitats, Lowland Forest, Nisaetus bartelsi

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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