Judul: Analisis kelembagaan dan strategi peningkatan daya saing komoditas cabai Kabupaten Garut
Abstrak: The objectives of this study are to identify supply chains, analyze the institutional, formulate strategies for competitiveness enhancement, design competitiveness enhancement model, and determine the main strategies in competitiveness enhancement of chili pepper in Garut Regency. This study uses primary data (observations, interviews, and questionnaires) and secondary data (literature study). Data processed and analyzed by Descriptive Analysis, SWOT Analysis, The House Model, and Pairwise Comparison. The results of this study are: (1) There are 6 supply chain structures in chili pepper distribution; (2) The main institutional sectors that contribute in competitiveness enhancement of chili pepper are public sector, voluntary sector, and private sector; (3) SWOT Analysis obtains 15 alternative strategies; (4) The House Model as competitiveness enhancement model has 3 pillars that consists of product; human resource; institutional and marketing; (5) The main strategies in competitiveness enhancement of chili pepper are: (a) Increasing the number of productions; (b) Market expansion; and (c) Strengthening and developing partnership
Keyword: Bogor Agricultural University (IPB), The House Model, Institutional, Competitiveness, Chili

Judul: Income and Efficiency of Chili Farming Partners and Non-Partners (Case Study of Chili Farmers Closedloop Partnership in Garut Regency, West Java)
Abstrak: Permintaan dan penawaran komoditas cabai yang sangat fluktuatif setiap tahunnya mendorong pemerintah, dalam hal ini Kemenko Perekonomian untuk mencanangkan pilot project model kemitraan closedloop. Pemerintah menunjuk Kabupaten Garut sebagai pilot model closedloop dengan harapan dapat meningkatkan produktivitas dan pendapatan petani. Tujuan penelitian ini adalah menganalisis struktur biaya dan pendapatan usahatani cabai petani closedloop dan non closedloop dan menganalisis serta membandingkan tingkat efisiensi usahatani cabai di Kabupaten Garut pada petani closedloop dan non closedloop. Metode analisis yang digunakan adalah analisis kualitatif yang dipaparkan secara deskriptif pada analisis usahatani dan analisis kuantitatif menggunakan analisis pendapatan usahatani, analisis perbandingan penerimaan, biaya (R/C Ratio), dan analisis uji beda. Hasil dari penelitian ini menunjukkan bahwa keuntungan cabai petani closedloop lebih menguntungkan (Rp51.528.958/ ha/ musim) jika dibandingkan dengan petani non closedloop (11.787.630/ ha/ musim). Petani closedloop lebih efisien secara penerimaan jika dibandingkan petani non closedloop dengan perbandingan nilai R/C 1,55 petani closedloop dan 1,09 petani non closedloop.
Keyword: Cabai, Closedloop, Efisiensi, Kemitraan, Pendapatan

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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