Judul: Karakteristik morfometri ukuran dan bentuk tubuh kmabing peranakn etawah pada kelompok umur di koperas daya mitra primata
Abstrak: The present experiment was conducted to discrimnate the body size and body shape of the Etawah grade goats in different group of age at Daya Mitra Primata (DMP) Cooperative. Forty-seven of Etawah grade goats at DMP Cooperative were used. All Etawah grade goats was grouped according to sex and age. It were consisted of 32 female goats (five heads of I0, six head of I1, seven heads of I2, eleven heads of I3 and three heads of I4) adan 15 female goats (six head of I0, five heads of I1 adn four head of I4).
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Judul: Ukuran dan Bentuk Tubuh Kambing Perah Peranakan Etawah Di Peternakan Doa Anak Yatim Farm dan Cordero Farm
Abstrak: The study observed body size and shape variability of Etawah Grade dairy goat in Doa Anak Yatim Farm (DAYF) in Waru Tegal village, District Ciampea and Cordero Farm (CF) in Ciapus, Bogor. EG dairy goat consisted of 185 heads were divided into 97 heads in DAYF (45 males and 52 females) and 88 heads in CF (35 males and 53 females). Goat was not randomly selected (purposive sampling). Descriptive statistics indicated that body measurements of PE dairy goat in CF was higher and selected strict than in DAYF. T2-Hotelling showed highly significant (P<0.01) differences in linear measurements of body surface of EG dairy goat in DAYF and CF. Principal Component Analysis showed that the size discriminator of EG dairy goat in DAYF and in CF was similar, namely body length and chest circumference. Eigen vector of body length and chest circumference of EG dairy goat in DAYF were +0.528 and +0.550 respectively, and that of in CF were +0.476 dan +0.522 respectively. The possibility proportion of Ettawa and Local (Kacang) blood goats observed was the same. The range of PE goat size in DAYF obtained at 58.722 to 185.974 wider than those found in CF at 76.323 to 182.257. The shape discriminator of EG dairy goat in DAYF and CF was different. The shape discriminator of EG dairy goat in DAYF was 0.768, whereas that of body length in CF was 0.837. Clustered diagram showed that the body size will increase and its shape will change as the EG dairy goats from both farm are getting older.
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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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