Judul: Analisis pendapatan usahatani asparagus di Kecamatan Ciwidey, Kabupaten Bandung, Jawa Barat
Abstrak: Asparagus merupakan tanaman yang dipanen setiap dua hari sekali dan dapat mulai dipanen pada saat umur tanaman sudah mencapai 8 bulan. Penelitian ini bertujuan untuk menganalisis keragaan usahatani dan tingkat pendapatan usahatani asparagus di Kecamatan Ciwidey dengan menggunakan analisis struktur biaya, analisis pendapatan dan R/C serta analisis pendapatan yang dihitung dengan menggunakan ukuran penampilan usahatani seperti return to total capital, return to farm equity capital, dan return to family labour. Berdasarkan hasil penelitian menunjukkan bahwa pendapatan asparagus dari R/C maupun berdasarkan ukuran penampilan usahatani pada umur tanaman 1 tahun masih bernilai negatif dan usaha yang dijalankan belum efisien. Berdasarkan hasil penelitian pendapatan asparagus baik dari R/C maupun berdasarkan ukuran penampilan usahatani bernilai positif dan usaha yang dijalankan sudah efisien memasuki umur tanaman 2 tahun.
Keyword: age plant, R /C, return to the total capital.

Judul: Analisis Kelayakan Usaha Asparagus (Asparagus Officionalis) di Kelompok Tani Al'istiqomah Kecamatan Ciwidey Kabupaten Bandung
Abstrak: Asparagus is a subtropical plant that can be cultivated in the highlands of Indonesia, such as Bandung Ciwidey that have the necessary conditions to grow asparagus. The first farmer groups that cultivates asparagus in District Ciwidey is Al’istiqomah Farmer Group. This group is the first farmer group who became a pioneer in commercializing asparagus. Expensive seedling price is one of the obstacle that the farmers group faces in cultivating these plants, that have a technical life of 5 years. The purpose of this study was to analyze the feasibility of Farmers Group Al’istiqomah in the non-financial and financial aspects. In ii addition, this study also analyzes the sensitivity to changes in operating conditions using a switching value. The results of the research will show that not all the criteria on financial and non-financial aspects can be feasible. Analyses were performed with two scenarios, the first scenario is the actual condition of the business and the second scenario is the condition of the development work done by adding greenhouse s in the field. In scenario I, the NPV obtained was 7 182 684.85, the value of the Net B / C is 1.17, the IRR value was 12% to a 7% discount rate and the payback period for scenario I is 4.48 years. In scenario II, the NPV obtained 26 012 781.22, the value of the Net B / C is 1.51, the IRR value was 24% at a discount of 7% and the payback period is 4.0 years. These two scenarios are feasible by the farmer groups. A risk analysis on several inflow and outflow components was conducted in these two scenarios. The components that have a high degree of sensitivity to change is the decline of production in the first scenario with the value of 10.22% and also in the second scenario with the value of 26.41%.
Keyword: Bogor Agricultural University (IPB), nonfinancial aspects., financial aspects, Al’istiqomah farmer groups, Asparagus

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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