Judul: Pengelolaan Orangutan Kalimantan dan Persepsi Pengunjung tentang Pengelolaanya di Pusat Primata Schmutzer Jakarta
Abstrak: Ancaman kepunahan terhadap orangutan kalimantan di habitat alaminya dapat diatasi dengan melakukan upaya konservasi secara ex-situ. Lembaga konservasi ex-situ yang melakukan perlindungan khusus terhadap primata adalah Pusat Primata Schmutzer (PPS). Penelitian ini bertujuan untuk mengidentifikas i pengelolaan orangutan kalimantan, menganalisis persepsi pengunjung tentang pengelolaanya dan menghitung nilai willingness to pay (WTP) untuk pengelolaanya. Metode yang digunakan untuk mengidentifikasi pengelolaan orangutan kalimantan yaitu dengan observasi lapang dan wawancara. Data persepsi pengunjung dan WTP dikumpulkan dengan penyebaran kuisioner pada 100 responden. Hasil penelitian ini menunjukkan bahwa seluruh aspek pengelolaan yang telah dilakukan di PPS sudah baik. Persepsi pengunjung terhadap pengelolaan orangutan kalimantan di PPS cenderung baik. Nilai rata-rata total WTP untuk pengelolaan orangutan kalimantan yaitu sebesar Rp. 17.350, dengan perkiraan rata-rata jumlah pengunjung dalam satu bulan adalah 19.189, diperoleh total pendapatan ekonomi dalam satu bulan sebesar Rp 332.929.150. Faktor yang berpengaruh signifikan terhadap nilai WTP adalah jenis kelamin, umur, dan tingkat pendapatan., The threat of extinction to the bornean orangutan in their natural habitat can be overcome by carrying out ex-situ conservation efforts. The ex-situ conservation institutions that provide special protection for primates is the Schmutzer Primate Center. This study aims to identify the management of bornean orangutans, analyze visitor perceptions about their management and calculate the value of willingness to pay (WTP) for their management. The method used to identify the management of te bornean orangutans is by field observations and interviews. Data on visitor perceptions and WTP were collected by distributing questionnaires to 100 respondents. The result of this study indicate that alla aspects of management that have been carried out at PPS are good. Visitors’ perceptions of the management of the bornean orangutans at PPS tend to be good. The average value of the total WTP for the management of the bornean orangutans is Rp. 17.350. with the average number of visitors in one month is 19.189 so the total economic income in one month is Rp. 332.929.150. Factors that have a significant effect on the value of WTP are gender, age, and income level.
Keyword: Bornean orangutan, management, perception, willingness to pay

Judul: Captive Breeding Management and Animal Welfare Level of Orangutan Kalimantan (Pongo pygmaeus) in Taman Safari Indonesia Bogor
Abstrak: Populasi orangutan kalimantan di alam semakin terancam sehingga upaya konservasi secara eksitu perlu dilakukan. Taman Safari Indonesia Bogor merupakan salah satu lembaga konservasi yang melestarikan orangutan kalimantan di luar habitat aslinya. Penelitian ini bertujuan untuk mengidentifikasi teknik pemeliharaan, mengidentifikasi pemanfaatan satwa bagi oleh pengelola, serta mengukur tingkat kesejahteraan orangutan kalimantan di TSI bogor. Metode yang digunakan yaitu observasi lapang melalui pengamatan dan pengukuran, wawancara, dan studi pustaka. Hasil penelitian menunjukan bahwa teknik pemeliharaan yang dilakukan sudah baik namun perlu dilakukan peningkatan. Pemanfaatan yang diberikan oleh pengelola dalam mengelola orangutan kalimantan adalah dengan memberkan edukasi bagi pengunjung. Tingkat kesejahteraan orangutan kalimantan tergolong sangat baik berdasarkan penilaian five domain satwa menurut South East Asian Zoos and Aquarium Association (SEAZA)., Bornean orangutan populations in the wild are increasingly threatened, so ex situ conservation efforts need to be carried out. Taman Safari Indonesia Bogor is one of the conservation institutions that conserve Bornean orangutans outside their natural habitat. This study aims to identify captive breeding, animal utilization for visitors, and measure the welfare level of Bornean orangutans at TSI Bogor. The method used was field observation through observation and measurement, interviews, and literature study. he results showed that the maintenance techniques carried out were good but needed to be improved. Utilization provided by the manager in managing Bornean orangutans is by providing education for visitors. The welfare level of Bornean orangutans is classified as very good based on the assessment of five animal domains according to the South East Asian Zoos and Aquarium Association (SEAZA).
Keyword: orangutan, orangutan kalimantan, pongo pygmaeus, tingkat kesejahteraan, teknik pemeliharaan, taman safari, taman safari indonesia, kesejahteraan satwa

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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