Judul: Long-tailed Macaque (Macaca fascicularis) Morphometry on Tinjil Island
Abstrak: Monyet ekor panjang (Macaca fascicularis) banyak digunakan dalam riset biomedis sebagai hewan model. Salah satu lokasi konservasi M. fascicularis di Indonesia terletak di Pulau Tinjil, Provinsi Banten. Pulau Tinjil termasuk jenis Natural Habitat Breeding Facility (NHBF). Penelitian ini menggunakan 40 ekor MEP di pulau Tinjil dan 30 ekor MEP di fasilitas penangkaran Pusat Studi Satwa Primata. Parameter morfometri mencakup bobot badan, panjang badan anterior, total tinggi kepala, panjang lengan atas, panjang lengan bawah, lebar dada, tebal dada, lebar pinggang, panjang paha, dan panjang betis. Uji Mann-Whitney digunakan untuk membandingkan morfometri MEP di Pulau Tinjil berdasarkan umur dan jenis kelamin. Hasil penelitian menunjukkan bahwa perbedaan ukuran morfometri sangat terlihat pada usia dewasa antara jantan dan betina. Selain itu, perbedaan juga terlihat secara signifikan antara kelompok jantan usia pra-dewasa dan dewasa. M. fascicularis yang berhabitat di pulau Tinjil relatif lebih kecil dibandingkan dengan studi-studi sebelumnya, namun dalam beberapa kategori usia masih masuk dalam rentang ukuran tinggi duduk dan berat badan., Long-tailed macaque (Macaca fascicularis) are widely used in biomedical research as animal models. One of the conservation sites in Indonesia is located on Tinjil Island, Banten Province. Tinjil Island is a Natural Habitat Breeding Facility (NHBF). Research about morphometry of long-tailed macaque on this island is still minimal. This study used 40 macaques on Tinjil Island and 30 macaques in the Primate Animal Study Center captive facility. Morphometric parameters include body weight, anterior body length, total head height, upper arm length, forearm length, chest width, chest thickness, waist width, thigh length, and calf length. The Mann-Whitney test was used to compare morphometry of Macaca fascicularis on Tinjil Island based on age and sex. The results showed that differences in morphometric size were very visible in adulthood between males and females. In addition, significant differences were also seen between groups of pre-adult and adult males. M. fascicularis which lives on Tinjil Island is relatively smaller compared to previous studies, but in several age categories it still falls within the range of sitting height and body weight.
Keyword: Macaca fascicularis, monyet ekor panjang, morfometri, tinjil

Judul: Karakteristik Wilayah Jelajah Monyet Ekor Panjang (Macaca fascicularis Raffles 1821) di Pulau Tinjil, Pandeglang, Banten
Abstrak: Long-tailed macaque (Macaca fascicularis Raffles 1821) is one of primate species found in Indonesia. The species is frequently used as pets and laboratory animal for biomedical purposes. However, the need of this long-tailed macaque is generally fulfilled with direct capture from the wild (Supriatna & Wahyono 2000). This wild capture is one of the threat for the population of the species. Therefore, it needs an conservation effort to overcome this threat, such as establishing a captive breeding. One of the captive breeding that has been established to preserve the sustainability of long-tailed macaque is a semi natural captive breeding on Tinjil Island. In semi natural captive breeding, habitat management is one of the most important activities to ensure the success of captive breeding. One of the most important information in habitat management of long-tailed macaque on Tinjil Island is its home range. By knowing this information, it can be determined the appropriate habitat management. The purpose of this study was to determine home range characteristics of long-tailed macaques on Tinjil Island. The research was conducted in Semi Natural Captive Breeding of Tinjil Island, Pandeglang, Banten from June to August 2009. Home range data was formulated based on daily range of long-tailed macaque, obtained by the group follows method at its active time. The result showed that the home range of long-tailed macaques on Tinjil Island occupied coastal forest ecosystem type and lowland rainforest. The crown stratification was dominated by strata C. The long-tailed macaques used different conditions of crown closures (dense and less dense crown closures) for their daily activities. The species of plants that has been used as food sources consist of 25 species. The high preferences of food consist of Baringtonia asiatica, Antidesma bunius, Ficus variegata, Ardisia humilis, Ficus sp., Manilkara kauki, and Hibiscus tiliaceus. The water that is used by long-tailed macaques comes from various sources (rain-water in the slot of trees, water from containers placed by field staff, water from the tap around the Basecamp and from the fruits and leaves). The average estimation home range for long-tailed macaque is 6.9 ha.
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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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