Judul: Analisis kelembagaan dan strategi peningkatan daya saing komoditas kentang (Solanum tuberosum L.) Kabupaten Banjarnegara, Jawa Tengah
Abstrak: The increase of import volume and the decrease of export volume of vegetables require the efforts to improve the competitiveness of local vegetable products. Potato is the core of highland vegetable commodities in national and regional areas that potential to be developed. One of the potatoes production centers in Central Java is Banjarnegara regency. The purpose of this study are to formulate strategy and Key Performance Indicators (KPIs) that will improve the competitiveness of potato in Banjarnegara. The source of primary data obtained from interviews and secondary data obtained from study of literature. Data have been analyzed by descriptive analysis, TOWS analysis, The House Model, and Pairwise Comparison. The results of this study indicate that the strategies that become the priorities to improve the competitiveness of potato in Banjarnegara are the provision of cooperation in indicator of the number of farmers who distribute their products in cooperative, quality improvement of potatoes production in indicator of increasing the number of certified seed potatoes that meet farmers needs, and increased protection against farmers in indicator of regulation and government policy.
Keyword: Bogor Agricultural University (IPB), Strategy, Potatoes, Key Performance Indicators (KPIs), The House Model, Competitiveness

Judul: Analisis Kelembagaan dan Strategi Peningkatan Kinerja Kluster Komoditas Kentang Kabupaten Wonosobo
Abstrak: Asean economic community (AEC) 2015 provide opportunities and new challenges have to faced in agricultural development . Goals of this research are: analizing the alternatif and dominant supply chain, human resources of agricultural institutions and formulate the strategy for perfomance improvement potatos comodity in this area. Data analyzed by Descriptif analysis of supply chain, institutional, TOWS Analysis Strategi, and Key Perfomance Indicator based Pairwise Comparison method. The result of this study: There are 12 keys performances indicators with three priority indicators to improve perfomance of potatos: a) Enhancement the number of active farmers group as the first priority b) Enhancement the number of micro financial agribusiness institution as the second c) Enhancement amount of annual potato production as the third. There are strategy for perfomance improvement of potatos comodity based on priority indicator: 1) Increasing farmers beginner’s interest to join farmers group, 2) Improving the capacity of farmers through joint active farmer groups in improving innovation and perfomance of agricultural products, 3) Strengthen institutional farmers in managing LKMA, 4) Increasing productivity through agricultural intensification.
Keyword: Bogor Agricultural University (IPB), Supply Chain., Perfomance Improvement, Key Perfomance Indicator, Institutional

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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