Judul: Analisis Efisiensi Produksi Usaha Penggemukan Domba Tawakal Farm Caringin Bogor pada Asal Daerah Bakalan yang Berbeda
Abstrak: This research is aimed to analyze the efficiency of sheep fattening production at Tawakal Farm, Caringin, Bogor. This research used three treatments with eight replication. The treatment was devided by the origin of the sheep’s seeds, which was the local sheep from Cicurug (West Java), Jampang (West Java), and Temanggung (Central Java). The sheep were given Brachiaria humidicola and tofu waste as feed. Average daily gain (ADG) and feed efficiency were observed. The result showed that sheep from Temanggung got the highest value of ADG (100.919±6.949 g/sheep) and the highest value of feed efficiency (0.113±0.008/sheep). The calculation of income analysis showed that the local sheep from Temanggung (Central Java) got the highest income (Rp 460 593±28 537.84/sheep) and the highest R/C ratio (1.63±0.05/sheep). In this study, the sheep from Temanggung (Jawa Tengah) which has cultivated at Tawakal Farm had the highest production efficiency.
Keyword: sheep fattening., seed origin, increasing body weight, income analysis, feed efficiency

Judul: Analisis Pendapatan Usahatani Penggemukkan Domba di Mitra Tani Farm (Studi Kasus: Desa Tegal Waru, Kecamatan Ciampea, Kabupaten Bogor)
Abstrak: Lamb is one of the farm commodity consumption increased from year to year. Indonesia has not been able to fulfill the needs of domestic lamb. The continuing slowdown of production shows that the demand for lamb is on the rise. The increasing deman for lamb is a signal for farmers who seek lamb chops that will ultimately affect their revenue and income. This study aims to detemine the variabilty of lamb fattening in farmm cost structure, acceptance, revenus, and efficiency of lamb fattening in farming income. Location selection is done by purposive sampling in the village of Tegal Waru, Ciampe district, Bogor regency as one of the centres of lamb commodities in Indonesia. Analyses were perfomed with analysis of farming, supported by primary and secondary data. The results showed that fattening sheep farming in the Mitra Tani Farm efficient and profitable, visible from the R / C ratio of 1.54 over cash costs and R / C ratio of the total cost of 1.50
Keyword: Revenue and Profits, Feeder Lambs, Farm Analysis, R/C Ratio

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.
Keyword: