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: Perbandingan Saluran Pemasaran Jambu Kristal Melalui ADC IPB-ICDF TAIWAN dan Non ADC IPB-ICDF TAIWAN di Desa Cikarawang Kecamatan Dramaga Kabupaten Bogor
Abstrak: ADC IPB-ICDF TAIWAN makes a partnership with farmers especially farmers in Cikarang village, in developing commodity of crystal guava. A partnership who lived is coaching and facilitation from ADC to farmers so that farmers can participate in the supply chain of modern markets and not merely a business partnership between suppliers (farmers) with buyers (ADC) (Muflikh 2012). The problem that happens is the whole of crystal guava farmers in Cikarang are trained farmers of ADC IPB-ICDF TAIWAN, but in marketing their products, not all farmers sell crystal guava to ADC IPB-ICDF TAIWAN. Farmers choose to use other marketing channels besides ADC IPB-ICDF TAIWAN, such as: traders (broker) and traditional retailers. This case causes demand crystal guava from modern markets are not met. Therefore , research is needed to determine level of efficiency and difference in 2 channel marketing. This study used qualitative and quantitative analysis. Qualititative analysis is used to determine agencies, functions, structure and market behavior. Quantitative analysis is used to determine the operational efficiency of marketing by the marketing margin value, farmer's share and ratio of benefit over cost and paired t-test. Based on the results of marketing channel ADC IPB-ICDF TAIWAN has the lowest margin value on channel 2 pattern that is Rp5 000 and has highest farmer's share that are 54.74 and 54.54 % in the pattern of channels 1 and 2. While marketing channel non ADC IPB-ICDF TAIWAN has largest ratio on 5 channel pattern is that is 5.49 which means for every 1 rupiah was spent as marketing costs will result benefits 5.49 rupiah. Paired t-test against the costs, benefits and B/C ratio indicates there is no difference that significant between average cost, profit and B/C ratio between marketing channel of ADC IPB-ICDF TAIWAN and non ADC IPB-ICDF TAIWAN.
Keyword: marketing efficiency, guava crystal’s marketing, ADC IPB-ICDF TAIWAN

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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