Judul: Strategi pengembangan agribisnis komoditas kentang melalui pendekatan sumber daya manajemen di Kabupaten Banjarnegara
Abstrak: Horticulture is one of the agriculture sub-sector which is potential to be developed, because it has quite high economic value and added value compared to other commodities. One of horticultural commodity namely potato (Solanum Tuberosum) is a vegetable, which has an important role to fulfill food needs. Potato has potential and good prospect to support food diversification program in order to achieve sustainable food security. Potato commodity is one of the best commodities in Banjarnegara district. Generally, this study aimed to make operational recommendation for agribusiness development strategy of potato commodity through management resource approach in Banjarnegara district. The study was aimed to 1) identify factors, that effect the agribusiness development of potato commodity through management resource approach in Banjarnegara district, 2) formulate agribusiness development strategy of potato commodity in Banjarnegara district and 3) determine the priority of alternative strategy for the agribusiness development of potato commodity in Banjarnegara district. Based on prospective analysis that there are 10 factors that effect the agribusiness development of potato commodity in Banjarnegara district. Agribusiness development strategy of potato commodity through management resource approach in Banjarnegara district is based on scenarios that the agribusiness will grow in the future. Based on analytical hierarchy process (AHP), the most influential factor in formulating agribusiness development strategy of potato commodity in Banjarnegara district is productivity.
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Judul: Strategi Peningkatan Daya Saing Petani Komoditas Kentang Melalui Analisis Beban Kerja
Abstrak: Karo Regency, North Sumatera, has a high, geographical potential through the development of vegetable cultivation. One of the leading commodities in this region is potato. However the achievement of potato target production has been facing instability since seven years ago. Based on the prpblem there are several factors related with human resource management that will be anayzed in the research.
Keyword: compatitiveness, the farmers, workload analysis

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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