Judul: Studi Faktor-Faktor Penentu Keberhasilan Pelepasliaran Orangutan Suamtera (Pongo abelii Lesson, 1827) di Taman Nasional Bukit Tiga Puluh, Propinsi Riau dan Jambi
Abstrak: The population of Sumatran Orangutan (P. abeii) nowadays in nature keep decreasing as the impacts of gross land destruction because of human's needs to land area and woods in high level. This condition become more serious when human's wants to make Orangutan (P.abeii)become endangered in its native habitat. Protection and rehabilitation methods that was done could not avoid or prevent speed of extinction of this animal in nature. Reintroduction is the modern rehabilitation activity by releasing some indicidues to the wildlife or by preparing siezumed animals become feral to conservation forest area as a new habitat where the species is not present at the moment. This study was done in august to December 2006 at Station of Sumatran Orangutan Reintroduction Centre in Buffer zone Bukit Tiga Puluh National Park, Kabupaten Tebo, Province of Jambi. The aim of this study was to measure the influence of determining factors to Orangutans reintroduction succesful to their native habitat and to identify other factors which give impact to reintroduction succesful. The results of this study are expected can give informations of succesful determination by using factors to Sumateran Orangutan reintroduction succesful in native habitat
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Judul: Tingkat Keberhasilan Pelepasliaran Orangutan Sumatera (Pongo Abelii Lesson 1827) Ex-Captive Di Pusat Reintroduksi Orangutan Sumatera Provinsi Jambi
Abstrak: Reintroduksi orangutan Sumatera ex-captive ke Ekosistem Bukit Tigapuluh merupakan Program Konservasi Orangutan Sumatera yang telah diatur dalam Strategi dan Rencana Aksi Konservasi orangutan 2007 – 2017, bertujuan untuk menghindari kepunahan spesies orangutan khususnya orangutan Sumatera. 158 individu telah dilepasliarkan yaitu sebanyak 35% berhasil dan hidup mandiri, 15% gagal. 79 individu atau 50% lainnya hilang kontak dan tidak ada data keberadaan. Penilaian perilaku orangutan ex-captive pasca pelepasliaran dilakukan terhadap individu muda jinak, muda semiliar dan dewasa dengan uji nyata pada nilai p<0,05. Pola aktivitas makan, istirahat dan aktivitas lain pada ketiga kelompok berbeda nyata, sedangkan aktivitas bergerak atau berpindah tidak berbeda nyata. Proporsi memakan buah, serangga, kambium dan pakan lain berbeda nyata pada ketiga kelompok. Sedangkan memakan daun, stem dan pakan dari teknisi tidak berbeda nyata. Ketiga kelompok banyak beraktivitas di ketinggian 10m - < 20 m dan menunjukkan tidak ada perbedaan nyata. Orangutan ex-captive muda semiliar memiliki tingkat keberhasilan yang lebih tinggi dibandingkan kelompok muda jinak dan dewasa. Faktor yang menyebabkan kegagalan adalah stres yang tinggi, kesehatan terganggu, kehilangan kemampuan foraging, kehilangan kemampuan beraktivitas di kanopi, tidak mampu menghindari ancaman, dan masih tertarik terhadap aktivitas manusia.
Keyword: orangutan Sumatera,, ex-captive, keberhasilan pelepasliaran, umur, perilaku.

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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