Judul: Pendugaan Kebutuhan  Nutrien dan Kecernaan Pakan pada Lutung Kelabu (Trachypithecus cristatus Raffles 1812) di Pusat Penyelamatan Satwa Gadog-Ciawi Bogor
Abstrak: This experiment was aimed at studying nutrient requirement and digestibility of grey leaf monkey (Trachypithecus cristatus Raffles 1812) in Gadog Wildlife rescue Centre Ciawi, Bogor. This experiment used four female grey leaf monkeys to measure their feed consumption and digestibility. Feeds that were given were pohpohan, spinach, a fruit tree leaf (melinjo), green Chinese cabbage, kangkung and boiled sweet potato. Feed were given twice a day at 08.00 and 14.00. The variables measured in this study were temperature and relative humidity, feed consumption, nutrient digestibility, total digestible nutrient (TDN) and digestible nutrient (DE). The results of this study show that the most palatable feed for all grey leaf monkey is sweet patato and pohpohan. Feed that were consumed from the highest to the lowest amount are boiled sweet potato, pohpohan, green Chinese cabbage, kangkung, spinach, a fruit tree leaf (melinjo). The average for fresh intake were 624.6 ± 19.85 g/head/day. The average for nutrient consumption are 19.05 ± 1.23 ash/head/day, 23.03 ± 0.64 crude protein head/day, 13.20 ± 0.18 crude fiber/head/day, 2.36 ± 0.64 ether extract/head/day, 44.09 ± 1.71 N-free extract/head/day and 73.94 % Total Digestible Nutrient. Digestibility coefficient of grey leaf monkey 12.77 ± 0.61% are crude protein, 6.85 ± 0.45% crude fiber, 0.90 ± 0.15% ether extract, 27.85 ± 2.64% N-freextractives and DE 3.31 ± 0.23 Mcal DE/kg DM.
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Judul: Potensi Pakan dan Perilaku Makan Lutung Budeng(Trachypithecus auratus) di Cagar Alam Dungus Iwul, Jawa Barat
Abstrak: Ebony leaf monkey (Trachypithecus auratus) is an endemic primate to Java Island, Lombok Island, and Bali Island. According to IUCN Red List of Threatened Species ver 3.1, conservation status of ebony leaf monkey is vulnerable and listed in Appendix II CITES. One of the things that need to be considered to preserve ebony leaf monkey’s population is maintain and increase the availability and abundance of its feed because feed is one of the basic needs of animals. The objectives of this research are to identify feed plant species, measured the abundance and distribution of feed plant species, estimate food palatability level, and identify ebony leaf monkey’s feeding behaviour. Data were analyzed using Chi-square test. There are 29 trees species of ebony leaf monkey’s feed. One of the feed is Orania sylvicola, which has the highest abundance. Distribution of ebony leaf monkey’s feed is random, only one species uniformly distributed which is Orania sylvicola. The most palatable food of ebony leaf monkey is Barringtonia racemosa. The position which most frequently performed when eating is sitting position.
Keyword: palatability, feeding behaviour, feed, ebony leaf monkey

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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