Judul: Analisis kelayakan usaha ternak domba rakyat di Desa Cibunian Kecamatan Pamijahan Kabupaten Bogor
Abstrak: The objectives of this research are: (1) to describe the characteristic of farmer and their sheep farm; and (2) to analyze the financial feasibility of sheep farm and it's sensitivity. Cluster random sampling applied to choose 164 sample from 700 sheep farmers household population in Cibunian Village. The sheep farm were clasified into three categories based on ownership of sheep, namely scale I (0,75- 2,50 SDD or Adult Sheep Unit); scale II (2.51-4.75 SDD); and scale III (4,76-8,50 SDD). The result of this research showed chat generall (52,44%) farmer in Cibunian village comitted their sheep farm on scale I. Farmer of each scale in avarage were categorized into productive aged, have lots of experience on shap farm activities, but they have low education. The result of financial feasibility analysis showed that for 10 years at the interest rate of 9,50%, Net Resent Value (NPV)of sheep farm on scales I, II and III respectively is Rp (3.537.029,00); Rp (1.413.826,00); and Rp 1.770.5 19,00, with the values of Benefit Cost Ratio (BCR) are 0.67; 0,89; and 1 ,I 0. Internal Rate of R e m (IRR) on scale I1 and 111 respectively is 057 and 16,56%. Sensitivity analysis was counted on scale Ill. Sheep farm on scale 1II was not feasible if farm costs increased more than 9,97% or farm revenues decreased more than 9.06% ceteris paribus.
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Judul: Profil Peternakan Domba Rakyat di Desa Cibanteng dan Desa Cikarawang.
Abstrak: Traditional farmers have good experience in sheep farming but they still have weakness in management, especially in financial aspects in measuring business profit and loss. This research was purposed to explaining general condition and examinating financial aspect of sheep traditional farm in two villages Cibanteng and Cikarawang. Thirty farmer respondents from each village were interviewed, and clasified into two categories (scale I and scale II) based on average number of sheep. Data were analyzed by description method. The result showed that average of farmer’s cash revenue in Cibanteng Village were Rp 4 894 737 per year (scale I) and Rp 9 000 000 per year (scale II); average of farmer’s cash revenue in Cikarawang Village were Rp 3 642 857 per year (scale I) and Rp 8 000 000 per year (scale II). Although they had got profit by cash revenue, actually they was in loss condition and not productive yet, shown by number of sale <BEP (Break Event Point) and Revenue and Cost ratio (R/C) <1. However they continued to raise sheep by traditional method because there are many production factors that have never calculated (non-cash of cost production) so that was still a profitable farm activity. By assumption of potential production coefficient, 77 sheep must be sold per year to made equivalent profit with Bogor regional minimum wage by maintaining 38 ewes at the beginning of year and supported by implementation of good farming practices (GFP).
Keyword: benefit target, financial analysis, sheep, traditional sheep farm

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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