Judul: Kasus: Desa Talaga, Kecamatan Cugenang, Kabupaten Cianjur, Jawa Barat
Abstrak: This study analyzed banana farms in Talaga Village, Cianjur District, West Java. The objectives of the study were to describe the banana farms condition, to analyze cost stucture and farmer income that cultivated banana farm by semi-intensive croping system based on standard operating procedure (SOP) from Primatani program. Data for this study were generated from 30 respondents randomly on Mei 2009. The respondents were banana farmers that joined in Primatani Program. Descriptive analysis, income analysis, and efeciency analysis were used in analyzing the data. The identification result revealed that all of farmer cultivate their banana by intercroppping system. The result of analysis showed that there were changes in cultivation methodes and farmer institution after joined in Primatani. The cost analysis suggest that the majority of cost component was natural fertilizer. The income analysis and efeciency analysis showed that the cultivation banana by SOP from Primatani profitable. It was proved by net profit value (Rp 16.945.968,69) and R/C value (more than one).
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Judul: Analisis Pendapatan Usahatani Sayuran di Desa Panundaan, Kecamatan Ciwidey, Kabupaten Bandung, Jawa Barat
Abstrak: This study was aimed to analyze vegetable farming system, income rates and its contribution to household income. Data were analyzed with descriptive method, farm income analysis and R/C ratio. The result showed that income of large farmers were greater than small farmers. Contribution of income of large farmers was 82.70 percent of the total of farmer income with R/C ratio 2.26. Contribution of income of small farmers was 64.59 percent of the total of farmer income with R/C ratio 1.85. The R/C ratio indicates that vegetable farming were efficient. From the share of vegetable income can be concluded that vegetable are the main source to total household income in Panundaan Village
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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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