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 Tingkah Laku Harian Lutung Merah Jantan (Presbytis rubicunda) pada Siang Hari di Penangkaran.
Abstrak: Lutung merah (Presbytis rubicunda) merupakan satwa liar yang termasuk dalam kelompok Old World Monkey. Populasi lutung merah saat ini mengalami penurunan dan dikuatirkan akan menjadi langka dan akhirnya punah. Penangkaran merupakan salah satu upaya secara ex situ untuk mempertahankan populasinya tetap. Informasi mengenai perilaku lutung merah di penangkaran sangat terbatas. Penggalian informasi perilaku lutung merah penting untuk manajemen pemeliharaan di penangkaran. Oleh karena itu, penelitian ini dilakukan untuk mengetahui dan mempelajari aktivitas tingkah laku harian dan pemilihan pakan pada lutung merah pada siang hari di penangkaran. Penelitian ini dilakukan dari bulan Agustus - September 2010 di Penangkaran Mamalia, Bidang Zoologi, Pusat Penelitian Biologi LIPI, Cibinong. Materi yang digunakan adalah satu ekor lutung merah jantan berumur tiga tahun lebih. Peubah yang diamati yaitu aktivitas harian lutung (makan, minum, defekasi, urinasi, lokomosi, grooming, vokalisasi dan istirahat) dan pemilihan jenis pakan. Jenis pakan yang diberikan terdiri atas delapan jenis, yaitu daun bunga kupu-kupu (Bauhinia purpurea), daun beringin (Ficus benjamina), sawi putih (Brassica rapa ssp. pekinensis), kacang panjang (Vigna sinensis), pisang siam (Musa paradisiaca), apel malang (Malusdomestica), jambu biji (Psidium guajava) dan ubi jalar (Ipomoea batatas). Pengamatan dilakukan mulai pukul 06.00 sampai dengan pukul 18.00 WIB. Setiap periode pengamatan dibagi lagi dengan interval waktu selama 15 menit. Pengambilan data menggunakan metode one zero sampling. Nilai satu diberikan bila ada aktivitas yang dilakukan dan nol bila tidak ada aktivitas. Data dianalisis secara deskriptif. Aktivitas pemilihan pakan lutung merah di penangkaran memperlihatkan sifat selektif terhadap pakan yang diberikan. Urutan pemilihan pakan berdasarkan jenis pakan berturut-turut adalah daun beringin, ubi jalar, pisang siam, apel malang, jambu biji, sawi putih, daun bunga kupu-kupu dan kacang panjang. Aktivitas istirahat (32,13%) mendominasi seluruh kegiatan lutung merah kemudian disusul aktivitas grooming (29,77%), lokomosi (13,36%), vokalisasi (12,66%), makan (8,36%), urinasi (2,17%), defekasi (1,11%) dan minum (0,43%).
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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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