Judul: Analisis Faktor-Faktor yang Mempengaruhi Produksi dan Pendapatan Usahatani Kacang Panjang (Studi Kasus : Kecamatan Nagrak, Kabupaten Sukabumi)
Abstrak: Long Beans is one commodity that many consumption by society and ranks third from the types of vegetables that are consumed by the people of Indonesia. One of production center located in West Java and one of them is Sukabumi Based on the total area harvested vegetables in Sukabumi, commodity beans were the highest compared to other vegetable crop acreage to total crop area reached 27 percent of the total area harvested. Sukabumi consists of several subbean commodity producers, one of which is the District Nagrak. However, productivity in Sub Nagrak beans are low 8 tons per hectare is still below optimum productivity that can reach 15 to 20 tons per hectare.. Based on the above issues it is necessary to analyze what factors affecting bean productivity levels in Sub Nagrak and whether the farming activities in the District Nagrak is efficient. Based on the research that has been made known that the value of R / C ratio of the farm cash costs were 2.22 and R / C ratio of the total cost of 1.76 so that it can be said long bean farming activities efficiently and profitably, while production factors that influence including land, seed, fertilizer urea, TSP / SP 36, NPK, nutitions, labor, whereas no significant factors are pesticide.
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Judul: Analisis Pendapatan Dan Faktor-Faktor yang Mempengaruhi Produksi Usahatani Kedelai di Desa Cipeuyeum, Kecamatan Haurwangi, Kabupaten Cianjur
Abstrak: Soybean is a crop which is consumed by Indonesian people in the form of refined products. West Java province is one of the largest soybean producing areas in Indonesia. One of the areas in West Java, which produces soy is Cipeuyeum village. However, soy is still become the interlude for the farmers. The benefits received by farmers over soy farming activities will be measured through analysis of the farming income and the value of R-C ratio. In addition, the influence of factors of production to the production of results will be viewed by using the multiple regression analysis. Based on the analysis of income, farmers who harvest the soybeans upon young and old pods suffered losses during the growing season. Factors of production which is used by farmers are land, seed, urea, KCl, phonska, liqiud fertilizer, MOL, workers, dan insecticide. Factors of production which gives a positive influence of soy production results include urea, phonska, dan insecticide.
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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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