Judul: Perilaku yang Berhubungan dengan Aktivitas Makan Bajing Tiga Warna (Callosciurus prevostii) pada Siang Hari di Penangkaran
Abstrak: Prevost's squirrel (Callosciurus prevostii) is included in protected wild species list. Concervation is an alternative way to save this species from being extinct. The purpose of this experiment was to obtain information about behaviour that related to feeding activity of prevost's squirrel. The experiment was conducted at capture breeding, Zoology Division, Research Centers for Biology – LIPI, Cibinong. The observation were divided into three periods, that were morning, afternoon, and evening. Each of the observation period was further divided into interval time in every 15 minutes. Data were analyzed using one zero sampling method. The results indicated that the activites of prevost's squirrel during daylight from the highest to the lowest are resting activity (68.62%), locomotion (13.34%), eating (8.10%), drinking (4.05%), grooming (4.53%), defecation (1.22%) and urination (0.15%). Resting activity is the highest activity which is done by the squirrel. During daylight feeds given are sunflower seed, sweet corn, guava, coconut, poison fruit and papaya. From all of these feeds, squirrel likes guava and papaya very much. Key Word : Callosciurus prevostii, feeding behaviour, captivity
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Judul: Aktivitas yang berhubungan dengan pola konsumsi pakan tarsius (Tarsius bancanus) di penangkaran pada malam hari.
Abstrak: Indonesia is known as a country which has various spesies of flora and fauna. Many of them are becoming extinct these animal are very useful as an object of experiment and also as pet animals. Nowadays wild animals in Indonesia are facing serious problem by increasing in rate of extinction due to evolution and human unwise management of nature. Therefore, preventing the extinction of wild animals can be done by conservation and protection of wild animals in captivity. Tarsius bancanus is one of distinct animal that should be protected. Tarsius bancanus is a nocturnal animal that distributes in Kalimantan, Bangka, Natuna and Sumatera island. Information of feeding activity of Tarsius bancanus is limited, especially in captivity. Feeding activity is an important factor that can influence feed intake. This exsperiment is aimed at studying feeding activity and pattern of feed intake of Tarsius bancanus in captivity at night. Two tarsius from Sumatera, were used in this experiment. Data of activity were recorded which included feeding, drinking, urination, defecation, locomotion, grooming and resting avtivities. In addition, the amount of feed intake and fecal production were also recorded. Data were analized quantitatively and descriptively. The results show that feeding, drinking, urination, defecation, locomotion, grooming and resting activities are 18.98%, 1.20%, 11.95%, 4.53%, 34.48 %, 20.49% and 8.35 %. The highest feeding activity (3.54%) occurs at 18 – 19 p.m. with feed intake is 0.92 gram dry matter (DM). The lowest feeding activity (0.88%) occurs at 0 – 1 a.m. and 3 – 4 a.m with feed intakes 0.23 gram DM. The average daily feed intake is 4.93 gram DM, with the average of cricket intake is 2.54 gram DM and grasshoper intake is 2.39 gram DM. The average daily fecal production is 0.65 gram DM. The average daily protein intake of cricket and grasshoper are 1.53 gram and 1.70 gram. The average daily crude fiber intake of cricket and grasshoper are 0.19 gram and 0.51 gram. The average daily energy intake of cricket and grasshoper are 15.695 ccal and 12.738 ccal. Feeding activity at 18 – 19 p.m. are the highest activity that occurred, this time can be used as a guideline for effective feeding program of Tarsius bancanus in captivity.
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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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