Judul: Potensi Pengembangan Sapi Potong di Kabupaten Sijunjung Propinsi Sumatera Barat
Abstrak: Agricultural land in Sijunjung District that has not been optimally utilized could be used for the development of beef cattle farm. The development should conform land suitability as a reference to determine beef cattle development to achieve the government's target of meat self-sufficiency in 2010. This study aims to foresee the potential of land in Sijunjung District for development of beef cattle using a combined 2006 Landsat images, LREP maps and other supporting data through, financial analysis, and the desired rearing cattle the local community. The results indicate that the potential lands for the development were about 120,063 ha or 38.35% of the existing land area, which consists of mixed garden (100,359 ha), 3,247 ha of abandoned land, 11,027 ha of paddy fields and 5,428 ha of bush. Actualy, land carrying capacity is 55,518 Animal Unit, and the potential carrying capacity is 134,722 Animal Unit. The results of the NPV analysis for all farming schemes were positive, with B/C Ratio> 1, and the IRR> outweighed the applicable interest rate. Assessment using AHP showed that the caging system was preferable (0.650) than shepherd-based farming (0.350) with a value of inconsistency about 0.05.
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Judul: Potential development of beef cattle and its strategies in the regency of  Lima Puluh Kota, West Sumatra
Abstrak: Populasi ternak sapi potong di Sumatera Barat menurun dalam lima tahun terakhir (2001-2006), dengan rata-rata penurunan sebesar 0,31 persen per tahun, sementara jumlah pemotongan meningkat rata-rata sebesar 9,35 persen per tahun (BPS Sumatera Barat 2007). Hal ini disebabkan rendahnya produksi dan produktivitas ternak sapi potong. Beberapa karakteristik produksi yang belum optimal antara lain rendahnya tingkat kelahiran (< 50%), tingginya angka kematian (> 2%), rendahnya pertambahan bobot badan (0,4-0,5 kg/ekor/hr), tingginya angka pemotongan ternak betina produktif (28%) (Dinas Peterbakan TK I Sumatera Barat, 2007a). Untuk memperbaiki keadaan tersebut diperlukan kontribusi dari berbagai pihak termasuk bantuan pemerintah untuk berupaya mengembangkan sapi potong antara lain melalui program peningkatan produksi dan produktivitas ternak sapi potong, penurunan angka kematian, dan mengendalikan pemotongan ternak betina produktif (Soetirto, 1997).
Keyword: livestock farming, livestock waste, land resources, beef production, West Sumatera

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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