Judul: Analisis Kelayakan Usaha Jaboticaba (Myrciaria cauliflora) di Kecamatan Lembang, Jawa Barat
Abstrak: Indonesia has a high diversity of fruits. The original fruits can be come from Indonesia or from other countries. Jaboticaba is one of the fruit plants from the other country that can be growth in Indonesia. Jaboticaba farm at Lembang, West Java is the biggest Jaboticaba farm in Indonesia. This research will analyze the business if the farm is reliable. The analyze aspects are financial analyze and non financial analyze. The financial analylze shown that earn after tax is Rp.5.494.373.101, NPV Rp.120.580.103, IRR 6,641% (discount rate is 6%), Net B/C 1,07 and PP is 19 years. The non-financial analyze shown the farm are reliable included market aspect, technical aspect, management aspect, social and environment aspect. The conclusion after the writer took observation that Jaboticaba Cherry Brazil farm is reliable to agribusiness.
Keyword: PP, Net B/C, IRR, NPV, financial aspect, non-financial aspect, Jaboticaba

Judul: Perbandingan Analisis Kelayakan Usaha Jambu Kristal (Psidium guajava L.) Petani Mandiri dengan Petani Binaan ICDF Kabupaten Bogor
Abstrak: Kristal guava presents as popular primadona fruits. Nowdays, there is a gap between demand and production. This gap could be an opportunity to open kristal guava business. The purpose of this research is to compare feasibility analysis of kristal guava between independent farmer (Mr.Agus) and mentored farmer by ICDF (Mr.Badri). The research was conducted at Tangkil Village and Cikarawang Village. Is that ICDF bring a positive effect to the farmer. Data analysis method which is used on this research is qualitative analysis method to analyze feasibility based on non-financial aspect such as market aspect, technical aspect, management and legal aspect, and also sosial, economic, culture and environmental aspect. Quantitative analysis based on investment criteria and sensitivity analysis using switching value to analyze feasibility based on financial aspect. The result of this feasibility analysis shows that kristal guava cultivation is feasible to run. Based on the sensitivity analysis using a switching value.
Keyword: kristal guava, comparison feasibility

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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