Judul: Prospek perkembangan peternakan sapi dan kerbau di daerah mekanisasi pertanian: studi kasus di Kabupaten Subang
Abstrak: Penelitian ini bertujuan untuk mengetahui faktor yang paling berpengaruh terhadap perkembangan populasi ternak sapi dan kerbau di daerah mekanisasi pertanian, peranan ternak sapi dan kerbau sebagai sumber tenaga kerja, pendapatan usaha ternak- sapi dan kerbau, dan prospek perkembangan peternakan sapi dan kerbau di daerah mekanisasi pertanian di masa yang akan datang. Metode penelitian yang dipakai adalah studi kasus yang dilakukan di dua desa di kabupaten Subang. Satu desa merupakan daerah pesawahan yang banyak menggunakan traktor dalam pengolahan sawahnya dan satu desa yang merupakam daerah pesawahan tapi tidak menggunakan traktor dalam pengolahan sawahnya. Yang dijadikan obyek penelitian adalah para pemilik ternak sapi dan kerbau, pemilik traktor, petani pemakai ternak, dan petani pemakai traktor. Data yang dikumpulkan ter diri dari data primer dan data sekunder. Data primer dihimpun dari keempat jenis responden, yang dilakukan melalui wawancara berdasarkan kuesioner yang telah disusun sebelumnya. Data sekunder diambil dari berbagai instansi dan kepustakaan yang erat kaitannya dengan penelitian ini.
Keyword: Agrotechnology

Judul: Prospek pengembangan usaha peternakan sapi potong di Kecamatan Surade Kabupaten Sukabumi
Abstrak: The objective of the research were 1) to identification internal and ekstemal factors which can influences beef cattle farming development in Surade Sub-District, 2) to formulate the strategy of beef cattle development in Surade Sub-District. Primary data obtained by direct interview with the beef cattle farmer, used questionaue as the tool. Secondary data obtained from relevant institutions sources that related with the topic of the research, the data analyzed descriptive quantitative method. The result of feseability study analysis showed Net Present Value (NPV) equal to Rp. 5,670,144,68, Benefit Cost Ratio (BCR) equal to 1.52, Interest Rate Ratio (IRR) equal to 22% and Pay Back Period (PBP) equal to 4 year. The return cost ratio (RiC ratio) of beef cattle farm business analysis, showed that ratio as 1.70 value. It means that the beef cattle farm business were profitable with earning equal to Rp. 2,286,006,94. Base on data feseability study analyzed showed beef cattle development in Surade Sub-District were feseable. Result of analysis of SWOT in the form of strategy S-0 that is cooperation with financial institution to increase working capital, cooperation with government institution to introduce artificial insemination technology. Strategy of W-0 that is re-activated farmer group in marketing beef cattle product, more recruit farmer adviser to increase farmer knowledge in beef cattle farming. Strategy S-T that is to increase farmer knowledge in animal health, to increase animal productivity by applicated advance breeding technology. Strategy W-T that is to increase farmer personal skill in beef cattle farming, it can be implemented by coopemtion between farmer group and government intsitution.
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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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