Judul: Analisis Efisiensi Ekonomi Usahatani Tumpangsari Wortel di Desa Sukatani, Kecamatan Pacet, Kabupaten Cianjur
Abstrak: The agricultural sector is one sector which is still reliable, because it has an important role for the economic development of a nation. Based on the value of 2007-2010 Indonesian horticulture Gross Domestic Product (GDP), vegetables are the second largest contributor to GDP after fruit with average value of Rp 28,885 billion. One type of vegetable that has the greatest growth rate is carrots, with growth rate 5.05%. Carrot production in Indonesia from 2007-2010 tended to increase. Largest carrot production is from Cianjur with the amount of 34 559 tones, equivalent to 30.43% of the total production in West Java and also become the center of production of carrots. The purpose of this study was to identify the factors that affect the level of production and estimate the production of economic efficiency. The model analysis used in this study was Cobb Douglas function model with Ordinary Least Square method (OLS). Economic efficiency analysis performed using the ratio approach Marginal Product Value (NPM) with Sacrifice Marginal Cost (BKM). The analysis showed that the factors which significantly affect the influence the farm production of intercropping of carrots were seeds, organic fertilizer and urea fertilizer. Results of economic efficiency analysis showed that farming had not reached economic efficiency yet. It was shown from the ratio of the Marginal Product Value (NPM) with sacrifices Marginal Cost (BKM) were not equal with one. Based on the income analysis, intercropping farming of carrots was providing economic benefits for farmers. This was indicated by the value of the cash cost of revenues over one growing season was Rp 10 747 174.00/Ha and revenues over one growing season total cost was Rp 3 592 374.00/Ha.
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Judul: Analisis Pendapatan Usahatani Wortel Benih Lokal dan Benih Impor (Studi Kasus: Desa Ciherang, Kecamatan Pacet, Kabupaten Cianjur)
Abstrak: Indonesia import carrot in the form of seed and also tuber to provide the needs of the domestic carrot has not fulfilled. Import seed of carrot in Indonesia is a signal for farmers to develop farming, seen the increasing demand of carrot import in Indonesia. This study aims to determine the income and income efficiency carrot using the different seed are import seed and local seed used by farmers in the study sites. Analyses were performed with farm analysis and Mann- Whitney statistic test to determine the income and efficiency of income are more profitable. The results show that the income of carrot import seed is higher to Rp2 761 000.00 compared with local seeds of Rp997 250.00. Farm efficiency analysis based on the value of R/C ratio, the return to capital, and the return to labor also showed that import seed more efficiently which is also supported by the results of statistic tests (exact.zig(2*(1-tailed sig.<). Results analysis can be use as recommendations to farmers in order to increase income and profits.
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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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