Judul: Studi Tingkat Keberhasilan Pembiakan Komodo (Varanus komodoensis Ouwens, 1912) di Kebun Binatang Surabaya, Jawa Timur
Abstrak: Komodo (Varanus komodoensis) merupakan satwa endemik yang termasuk dalam daftar Appendix I CITES dan dikategorikan rentan oleh IUCN. Penurunan populasi komodo sebesar 14,78% di habitat alami, mendorong pelestarian komodo di ex-situ, seperti di Kebun Binatang Surabaya (KBS). Penelitian ini bertujuan untuk mengkaji manajemen pembiakan, menentukan tingkat keberhasilan pembiakan, dan mengkaji kesejahteraan komodo. Data dikumpulkan menggunakan metode wawancara dan dianalisis dengan menghitung persentase daya tetas, angka kematian, tingkat perkembangbiakan, dan menilai kesejahteraan satwa. Hasil penelitian menunjukkan bahwa manajemen KBS cukup baik dan memperhatikan aspek pakan, kesehatan, kandang, dan pengaturan pembiakan. Tingkat perkembangbiakan komodo dikategorikan tinggi sebesar 93,33%, sedangkan daya tetas dan angka kematian dikategorikan sedang dengan persentase 46,06% dan 34,60%. Penilaian kesejahteraan komodo di KBS dikategorikan cukup, hal ini berarti pengelolaan komodo telah memperhatikan prinsip kesejahteraan satwa yang utama yaitu bebas dari rasa lapar dan haus.
Keyword: pembiakan, komodo, kesejahteraan, Kebun Binatang Surabaya

Judul: Perilaku Komodo (Varanus komodoensis) di Taman Margasatwa Ragunan
Abstrak: The komodo (Varanus komodoensis) is the world's largest lizard that prone to extinction since they only scattered in some small islands in eastern Indonesia. One preservation effort of the dragons is by breeding them in captivity places, such as Jakarta Ragunan Zoo. Eventhought in the captivity, it does not mean there are no problems faced by the komodo. The main problems are because of differences in the weather and environmental conditions. Therefore, the aim of the research is to conduct behavioral assessments of the komodo preserved in the Ragunan Zoo as the first step to resolve the problems. We used observational method called scan sampling. Observations were conducted in two periods of time, i.e. during the daylight (06.00 am-06.00 pm) and evening (6.00 pm-06.00 am). Observations of the behavior of the komodo included walking, stay still, sun bathing, rubbing body, yawn, drinking, eating, climbing, secreting saliva, craning of the tongue, and running. During the daylight, some of the behaviors were more dominant, i.e. walking, stay still, sun bathing, climbing, secreting saliva, and craning of the tongue. While during the night stay still was dominant.
Keyword: Bogor Agricultural University (IPB), Ragunan Zoo, scan sampling, Varanus komodoensis, komodo, behavior

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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