Judul: Komposisi dan Distribusi Otot Kambing Kacang dan Kambing Peranakan Etawah yang Dipotong pada Bobot Sedang.
Abstrak: A total of 36 goats which consist of 26 kacang goats and 10 peranakan etawah goats were used to evaluate the muscle composition and distribution slaughtered in medium body weight (16.49 kg). Compositition of carcass in slaugter weight, carcass weight and a half weight carcass kacang goats were significantly different (P<0.01) than PE goats. The expensive muscle group (1+3+5) were 52.15% of carcasses muscle of kacang goats and 51.47% of carcassses muscle of peranakan etawah goats. The other muscle group 2, 4, 6, 7, 8 and 9 were 4.75, 12.02, 3.82, 3.20, 7.22 and 16.76% of kacang goats 5.34, 12.56, 4.07, 3.06, 7.11 and 16.42% peranakan etawah goats. The weight of group 1 (proximal thigh) on kacang goats was heavier than PE goats. Percentage of all weight in both breed goats have relatively equal proportions except group 2 that was percentage distal thigh muscle PE goats was larger than kacang goats at the medium slaughter weight.
Keyword: peranakan etawah goat, kacang goat, muscle distribution

Judul: Perbandingan Distribusi Otot Kambing Kacang dan Peranakan Etawah pada Bobot Lepas
Abstrak: A total of 43 goats which consist of 27 kacang goats and 16 peranakan etawah goatswas used to evaluate the comparison of muscle distribution between kacang goat and PE goat slaughtered over the weight 10 Kg. The data of body components was analyzed using Analysis of Variance (ANOVA) while muscle of distribution and other body components were analyzed using Analysis of Covariance (ANCOVA) with slaughter weight, half carcass weight as a covariable. The result showed that groups of muscles and body components among these breeds were no significantly different (P>0.05). There were no significantly differences among breeds in muscles of groups except the percentages of muscles of groups 3 and the muscles of groups 5. There were no significantly differences among breeds in body components except inter muscle fat weight, subcutan fat weight, inter muscle fat percentage, subcutan fat percentage, and kidney fat percentage. In general, the major muscles groups percentage (groups 1+3+5) in kacang goat is 60.35% and 60.71% for peranakan etawah goat.
Keyword: body components, muscles distribution, goat, breads

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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