Judul: Studi reintroduksi orang utan Sumatera, Pongo pygmaeus abelii Lesson, 1827 yang dikembangkan di stasiun karantina Medan dan di Stasiun Reintroduksi Jambi
Abstrak: Orangutan merupakan salah satu primata yang kini paling terancam keberadaannya di dunia. Permasalahan yang dihadapi orangutan adalah perusakan terhadap habitatnya yang terbatas dan tingginya perburuan orangutan di habitat alaminya. Untuk mengatasi kepunahan orangutan maka saat ini dikembangkan suatu bentuk konsep penyelamatan yang disebut reintroduksi. Konsep reintroduksi ini merupakan suatu rancangan yang baru dikembangkan dalam rangka upaya penyelamatan orangutan dari kepunahan. Sehingga perlu diketahui bagaimana tingkat keberhasilan dari reintroduksi ini yaitu dengan melakukan proses pemantauan terhadap orangutan yang sudah diliarkan. Tujuan penelitian ini ialah untuk mengetahui tahapan kegiatan reintroduksi orangutan sumatera dan untuk mengetahui kegiatan pemantauan dan penilaian pasca reintroduksi dalam rangka mengetahui tingkat keberhasilan reintroduksi orangutan sumatera dan sekaligus mempelajari kriteria dalam penentuan tingkat keberhasilan reintroduksi. Penelitian ini diharapkan dapat memberikan informasi mengenai tahapan pelaksanaan reintroduksi satwa khususnya orangutan sumatera ke habitat alaminya. Penelitian dilakukan pada bulan Juli 2004 sampai Maret 2005 di dua lokasi yaitu di Stasiun Karantina Orangutan Sumatera yang terletak di Medan dan di Stasiun Reintroduksi yang terletak di Jambi. Metode yang digunakan untuk mengumpulkan data primer dan sekunder yaitu dengan observasi lapang, studi literatur dan wawancara langsung dengan pihak pengelola.
Keyword: 

Judul: Distribusi Sarang Dan Jelajah Harian Orangutan Sumatera Rehabilitan (Pongo Abelii Lesson, 1827) Di Stasiun Reintroduksi Orangutan Sumatera Sungai Pengian, Kabupaten Tebo, Provinsi Jambi
Abstrak: Natural distibution of sumatran orangutans are limited in the province of Nanggroe Aceh Darussalam and province of North Sumatra, which population is easily disturbed. Large number of orangutans that live outside their habitat, both domesticated and for trading, need rehabilitation for sumatran orangutan. sumatran orangutan reintroduction station Sungai Pengian is place to rehabilitate sumatran orangutan from Natural Resources Conservation Center (BKSDA) confiscated. Study on nest distribution and daily range of sumatran orangutan rehabilitant is need to conduct to determine the distribution of orangutans rehabilitant. Study was conducted on April until June 2009 at Pengian River Sumatran Orangutan Reintroduction Station, Tebo District, Province of Jambi. The purpose of this study was to determine the distribution of nests, daily range and orang-utan habitat constituent components sumatran orangutans rehabilitant. Data retrieval is done by following the path of transect to nest distribution of orangutans, orangutans daily range conducted by following the daily movements of individuals ranging from wake up in the morning until the orangutans back to the sleep in the nest. Nests distribution of rehabilitant sumatran orangutan in secondary forest vegetation former fields (25 nests/ha) and former logging (18.1 nests/ha) higher than the primary natural forests (1.3 nests/ha). This related to the location that not to far from orangutan reintroduction and education center. Orangutan also prefer alluvial plains mainly in the surrounding the river. Average daily range of sumatran orangutans rehabilitant are 463.8 m/day (206–732 m/day) and the estimated area of rehabilitant sumatran orangutans used polygon method are 23.16 ha (7.41–51.38 ha). Daily and extensive range of sumatran orangutans rehabilitant is lower than wild orangutans because of rehabilitant orangutans still in the socialization and learning level, so the ability to explore and find food is still less than wild orangutans.
Keyword: 

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.
Keyword: