Judul: Pengaruh bangsa dan paritas terhadap penampilan reproduksi ternak babi di usaha peternakan babi PT. Adhi farm, Solo
Abstrak: This research was held to determine the impact of breeds and parities for the pig reproduction performance. This research has been done at pig's commercial farm PT. Adhi Farm, Solo from July until August 2005. Material that used in this research are 112 Landrace's and 43 Yorkshire's swine. The variable in this research were litter - size of born alive, lactation length, litter size of weaning, litter size of weaning percentage, mortality for suckling pigs, weaning to pregnant interval, and frequency of pregnant per sow per year. Design used in this experiment was Completely Randomized Design Factorial 2 x 4. The first factor was the breeds (Landrace and Yorkshire) and the second factor was the parity (1, 2, 3, and 4). The treatment consists of eight and each treatment was different replicated (unbalance). The statistical analysis in this experiment was ANOVA with the GLM (General Linear Model) procedure and if there were significant difference (P4.05) between the measurements, therefore could continued with the Tukey multiple comparison test.
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Judul: Performa Reproduksi pada Induk Babi di PT Maharkata Farm Sukses Kabupaten Karo Provinsi Sumatera Utara
Abstrak: Reproductive performance needs special attention from farmers, in order to increase litter size number. This research aim to study the reproductive performance of sows. Sixty sows (40 heads secondary and 20 heads were primer data randomly used as a sample) belong to PT Maharkata Farm Sukses. The reproductive performance evaluate were age at first mating, litter size and interval between birth (calving interval) parity and birth weight. The result showed that there were no significantly different on the age of the first mating, number of litter size as well as calving interval of landrace and yorkshire landrace cross breed. The age of first mating were between 237.44±33.82 and 239.95±27.03 days. The litter size between 8.72±2.59 and 7.89±2.37 piglet respectively. The calving interval were 151.06±6.30 and 157.68±20.14 days. The result was also found that there were no difference between number of parity with litter size as well as litter size with birth weight.
Keyword: birth weight., parity, age at first mating, litter size, reproductive performance

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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