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: Studi perilaku makan monyet ekor panjang (Macaca fascicularis) di Pulau Tinjil, Jawa Barat
Abstrak: Makanan merupakan kebutuhan mutlak bagi setiap makhluk hidup. Untuk mengkonsumsi makanan setiap jenis memiliki cara yang khas. Dalam pengelolaan terhadap jenis satwa tertentu dalam memberikan makanan juga harus memperhatikan perilaku makan satwa tersebut agar makanan dapat dikonsumsi secara efisien. Tujuan dari penelitian ini adalah untuk mendapatkan pola perilaku makan Macaca fascicularis baik di habitat aslinya maupun di dalam feeder (tempat memberi makan) yang nantinya dapat digunakan sebagai dasar atau pertimbangan dalam pengelolaan M. fascicularis khususnya tentang makanannya. Penelitian perilaku makan ini dilakukan di Pulau Tinjil, Jawa Barat dari tanggal 26 Juni sampai dengan 30 Agustus 1991. Untuk perilaku makan di luar kandang digunakan metode instantaneus scant grup dengan scant event 3 menit dan target minimal data yang dikumpulkan adalah 1000 IARFS (Individual Activity Record of Feeding). Sedangkan pengamatan perilaku makan dilakukan secara intensif dengan fokus aktivitas makanannya. Terdapat 14 jenis vegetasi yang menjadi makanan Macaca fascicularis. Ficus benjamina merupakan jenis yang paling banyak dimakan (31,7%). Disamping itu beberapa jeniss yang cukup banyak di konsumsi adalah Eugenia densiflora (11,5%), Gnetum gnemon (11,4%), Terminalia catappa (11,0%), Hibiscus tiliaceus (10,5%), dan Barringtonia asiatica (9,3%). ...
Keyword: 

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.
Keyword: