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: Kajian Aktivitas Harian Dan Perilaku Reproduksi Komodo (Varanus komodoensis, Ouwens 1912) Di Taman Margasatwa Ragunan
Abstrak: The aims of this study was to explore the daily activities and reproduction biology of 16 komodo dragons (Varanus komodoensis) in ex-situ hábitat at Taman Margasatwa Ragunan (TMR), Jakarta. The methods include observation, interview, and processing secondary data. Daily activities were observed such as basking, sheltering, walking, wallowing, and feeding. Basking and sheltering were displayed as the dominant daily activities which was spent for 27- 41% and 54 - 70% during the observation, respectively. While courtship, mounting, laying eggs were observed as reproductive behaviours during the study. Breeding problem of the komodo dragons in TMR was the failure of eggs incubation in the last five years.
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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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