Judul: Pemilihan Makanan Oleh Monyet Karier Buta Warna
Abstrak: Secara fisiologis, monyet ekor panjang karier butawarna mengalami kesulitan melihat warna merah. Respons fisiologis monyet karier butawarna terhadap warna merah berada di antara monyet normal dan butawarna. Penelitian pemilihan makanan oleh monyet karier butawarna di Taman Wisata Alam Pangandaran, Ciamis, Jawa Barat dilaksanakan bulan Agustus sampai Oktober 2000. Pengumpulan data menggunakan metodefocal animal sampling, scan sampling, dan ad libitum. Scan sampling menggunakan interval waktu 30 detik.
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Judul: Preferensi Pakan Monyet Ekor Panjang (Macaca fascicularis Raffles 1821) di Kampus IPB Dramaga
Abstrak: Monyet ekor panjang (Macaca fascicularis) akan memperluas wilayah jelajah hariannya untuk memperoleh sumber pakan yang cukup hingga melimpah, sehingga tak jarang menimbulkan konflik. Identifikasi preferensi pakan monyet ekor panjang perlu dilakukan sebagai salah satu bentuk meminimalkan konflik. Penelitian ini bertujuan untuk mengidentifikasi jenis pakan dan preferensi pakan, serta menganalisis perilaku harian monyet ekor panjang. Penelitian dilakukan dengan analisis vegetasi dan observasi lapang terhadap perilaku harian monyet ekor panjang. Hasil penelitian menunjukkan terdapat sebanyak 22 jenis tumbuhan pakan dan 2 jenis pakan non-tumbuhan. Monyet ekor panjang merupakan satwa frugivore, namun akan akan bersifat opportunistic omnivore apabila ketersediaan buah berkurang. Monyet ekor panjang lebih tertarik memakan buah, terutama buah belimbing bintang (Averrhoa carambola), buah matoa (Pometia pinnata), dan buah jabon (Neolamarckia cadamba),. Perilaku harian monyet ekor panjang yang paling dominan pada tiap petak contoh yakni bergerak, diam, dan makan., Long-tailed monkey (Macaca fascicularis) will expand their daily home range to obtain sufficient and abundant food sources, thus often causing conflict. Identification of long-tailed monkey feed preferences needs to be done as a form of minimizing conflict. This research aims to identify the type of feed and feed preference, also to analyze the daily activity of long-talide monkey’s. The research was conducted by vegetation analysis and field observation of the daily acyivity of long-tailed monkey’s. The results of this research showed that there were 22 types of feed plants and 2 types of non-plant feeds. Long-tailed monkeys are kind of fructivore animals, but will be ooportunistic omnivore if the avaibility of fruits decrease. Long-tailed monkeys are more interested to eat fruit, especially strafruit fruit (Averrhoa carambola), matoa fruit (Pometia pinnata), and jabon fruit (Neolamarckia cadamba). The most dominant daily activity of long-tailed monkey’s in each plot sampling were move, stay still, and eat.
Keyword: food preference, long-tailed monkey, plot sampling

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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