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: Nilai Ekonomi Orangutan Tapanuli (Pongo tapanuliensis) di Kawasan Hutan Batang Toru Kecamatan Sipirok Kabupaten Tapanuli Selatan
Abstrak: Satwaliar mempunyai peranan yang sangat penting bagi kehidupan manusia baik ditinjau dari segi ekonomi, penelitian, pendidikan dan kebudayaan, maupun untuk kepentingan rekreasi dan pariwisata. Untuk menunjang kepentingan ekonomi tersebut, konservasi satwaliar sangat penting. Penelitian ini dilakukan di tujuh desa Kecamatan Sipirok Provinsi Sumatera Utara dengan tujuan mengkaji persepsi masyarakat dan organisasi serta mentukan nilai ekomomi orangutan. Metode yang dipakai untuk memperoleh persepsi adalah wawancara menggunakan skala likert dan nilai ekonomi diperoleh dengan menanyakan willingness to pay terhadap pelestarian orangutan Batang Toru. Persepsi responden masyarakat menunjukkan persentase terbesar 57,9% menyatakan setuju terhadap pelestarian orangutan, sedangkan responden organisasi menunjukkan persentase terbesar 46,6% menyatakan sangat setuju terhadap pelestarian orangutan. Nilai orangutan berdasarkan metode biaya pelestarian berkisar antara Rp390.000.000/tahun sampai dengan Rp490.775.000/tahun. Nilai orangutan berdasarkan willingness to pay menurut masyarakat sebesar Rp65.760/tahun/rumah tangga dan menurut organisasi Rp1.680.000/tahun/rumah tangga. Berdasarkan willingness to pay masyarakat, diestimasi nilai pelestarian satu ekor orangutan bagi masyarakat kecamatan Sipirok sebesar Rp213.062/tahun., Wildlife has a very important role in human life, both from an economic, research, educational and cultural perspective, as well as for recreational and tourism purposes. To support these economic interests, wildlife conservation is very important. This research was conducted in seven villages of Sipirok District, North Sumatra Province with the aim of assessing community and organizational perceptions and determining the economic value of orangutans. The method used to obtain perceptions is interview using a likert scale and economic value is obtained by asking willingness to pay for the conservation of the Batang Toru orangutan. The perception of community respondents show that the largest percentage is 57.9% who agree with orangutan preservation, while organizational respondents show that the largest percentage is 46.6% who strongly agree with orangutan preservation. The value of orangutans based on the conservation cost method ranges from Rp. 390,000,000/year to Rp. 490,775,000/year. The value of orangutans based on willingness to pay according to the community is IDR 65.760/year/household and according to the organization IDR 1.680.000/year/household. Based on the community's willingness to pay, it is estimated that the conservation value of one orangutan for the community of Sipirok sub-district is IDR 213.062/head.
Keyword: economic value, orangutan, perception, likert scale, willingness to pay

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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