Judul: Hubungan Tipe dan Manajemen Perkandangan dengan Infeksi Kecacingan pada Orangutan (Pongo sp.) di Taman Margasatwa Ragunan Jakarta
Abstrak: Orangutan (Pongo sp.) is well known as native nonhuman primate from Indonesia, which has endangered status. Conservation effort through zoo was expected has a good maintenance management. The aim of this study was to analyze the correlation between type and cages management to helminths infection of orangutan at Ragunan Zoo, Jakarta. Total count faeces sample collected were 78 from 17 orangutans at 7 cage locations. Faeces collection were examined using qualitative and quantitative method. Prevalention of helminths infection were Ascarid 100%, Strongyloides 88.2%, Strongyloid 76.47% and Trichurid 5.88%. The result from method used were found that the highest infection Strongyloides 46.15% with average number 1320 epg. Dominance of Strongyloides infection was found on Pongo pygmaeus adult females (15-35 y.o) in location of A, B, and G which has the level of show orangutans no routine. Parameters such as exhibition cage with range small area (0-100 m2), cage with bright lighting and separate base cage design also has significant correlation (p<0.05) with helminths infection.
Keyword: Pongo sp., cage type, helminths infection, Ragunan Zoo Jakarta

Judul: Infeksi Cacing Saluran Pencernaan pada Orangutan Sumatera (Pongo abelii) dan Orangutan Kalimantan (Pongo pygmaeus) di Taman Margasatwa Ragunan.
Abstrak: Orangutan merupakan hewan endemik Indonesia dan satu-satunya spesies primata besar yang masih ada di Asia. International Union For Conservation of Nature and Natural Resources (IUCN) menyebutkan bahwa orangutan sumatera (Pongo abelii) dan orangutan kalimantan (Pongo pygmaeus) dikategorikan sebagai hewan yang sudah sangat terancam punah. Upaya konservasi ex-situ merupakan hal penting untuk mempertahankan kelestarian jenisnya. Penelitian ini bertujuan untuk mempelajari kejadian infeksi kecacingan saluran pencernaan pada orangutan sumatera dan orangutan kalimantan di Taman Margasatwa Ragunan. Sejumlah total 24 sampel tinja dikumpulkan dari 8 orangutan pada 3 area kandang yang berbeda. Pemeriksaan sampel tinja menggunakan modifikasi teknik McMaster, flotasi sederhana, modifikasi filtrasi-sedimentasi dan kultur feses. Identifikasi jenis cacing ditentukan melalui morfometri telur cacing serta larva infektif strongyle (L3) secara mikroskopik. Hasil penelitian menunjukkan bahwa persentase kecacingan pada delapan orangutan adalah 100%, yaitu strongyle 37.5% dan Strongiloides 100%. Derajat infeksi tertinggi adalah jenis Strongyloides ditemukan pada orangutan yang berumur sangat muda, sedangkan derajat infeksi strongyle relatif lebih rendah. Hasil identifikasi larva ditemukan L3 Trichostrongylus spp.
Keyword: Cacing saluran pencernaan, Pongo abelii, Pongo pygmaeus, Taman Margasatwa

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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