Judul: Study of Development Policies for Sustainable of Karacak Agropolitan Area Based on Mangosteen Agroindustry
Abstrak: The majority of livelihoods in rural areas are still dominated by farming activities. The lack of development of yield processing business has become a challenge to be solved. Agricultural products, which are only sold raw, cause many flows of economic value added to the city. The importance of developing an agropolitan area is closely related to efforts to create maximum added value of regional strategic commodities for the sustainability of agropolitan areas through the development of cultivation systems and processing of products. The development of activities that can create economic added value of strategic commodities in the region can be achieved by developing processed products that have higher value and competitiveness, known as agro-industry. In general, the processing of agricultural products in the agropolitan area is limited to processing activities with low value added and simple technology as occurs in Karacak Agropolitan Area, Bogor Regency. The purpose of this study was to analyze the feasibility of mangosteen agroindustry investment with the method of Financial Feasibility; analyze the level of sustainability for Karacak agropolitan area using the Multidimensional Scaling (MDS); formulate alternatives and determine policy priorities using the Analytical Hierarchy Process (AHP); and compile the direction of agropolitan approach policy based on agro-industry through the Interpretative Structural Modelling (ISM). The development of agro-industries in agropolitan areas was modeled on strategic commodity. Furthermore, the model was mapped in the form of conceptual diagrams for agropolitan development based on agro-industry. This model is general but adaptive, meaning that it is adapted to climate conditions, and geographical area, especially characteristics of local strategic commodities and human resources. The results of the feasibility analysis of agro-industry showed that mangosteen dodol (traditional food) and floor cleaner from mangosteen peel extract agro-industries were very sensitive to increasing raw material prices as well as a decreasing product prices. Under normal conditions, the results of feasibility for mangosteen dodol were: NPV Rp. 4,914,291,000; IRR 111.6%; B/C Ratio 1.18; and PBP 1.03 years. Whereas for floor cleaner of mangosteen peel extract, has: NPV Rp1,186,600,400; IRR 20.2%; B/C Ratio 1.04; and PBP 3.5 years. Product that have more resistance to increasing raw material factors, decreasing product prices and increasing bank interest rates was capsulated mangosteen peel extract. This product was feasible to be implemented in agropolitan area with NPV Rp. 17,690,067,800; IRR 102.1%; B/C Ratio 1.39; and PBP 1,025 years. The added value of agro-industrial mangosteen peel extract was Rp. 90.800/kg, mangosteen dodol was Rp. 53.600/kg, and mangosteen peel extract floor cleaner was Rp. 18.700/L. The economic value of the agropolitan area of Karacak on the basis of mangosteen farming and the collaboration of three types of agro-industry was Rp. 364,429,156,800. Through the development of agro-industry can encourage the sustainability of the agropolitan area. The results of the MDS analysis showed that the agropolitan area of Karacak is not sustainable especially in terms of policy. MDS analysis on the economic, social, environmental, technological and infrastructure dimensions were stated to be less sustainable with the sustainability index between 34.12- 49.96%. Whereas the policy dimension was declared not to sustain with sustainability index 22.31%. Based
Keyword: agropolitan approach, agro-industry, policy, sustainability

Judul: Sistem penunjang keputusan perencanaan pengembangan agroindustri Manggis (Garcinia mangostana Linn) (studi kasus di Kabupaten Bogor)
Abstrak: Mangosteen has become the Queen of commodities to export fresh fruit to foreign countries. But the numbers are still about 20% of the total production in Indonesia is mostly caused by low quality of the fruit. For that, they need diversified commodities processed mangosteen products. The objectives of this research to develop a model of decision support system for mangosteen agroindustry development in bogor district and recommend a strategy for planning and development of the agroindustry to the government of Bogor district and mangosteen prospective employers. Decision support system for mangosteen agroindustry development implemented into a computer program package called mangosteen 1.0 by using Pascal programming language in Embarcadero Delphi XE which consists of six models, including model of prospective product, site analysis model, model of analysis production centers, model of the mangosteen cultivation financial feasibility, model of agro-industry financial feasibility, and model of mangosteen development strategy. Decision support system using the comparison ekponensial method ( MPE), and analitical Hierarchy Process method (AHP). This mangosteen agro-industrial is plan to be located in Dramaga based on site selection using MPE method with a capacity of 50.000 bottles of mangosteen xanthone per month. This research programme shows that the mangosteen agro-industrial of xanthone is feasible with NPV Rp. 8.804.311.994, IRR 52%, Pay Back Period (PBP) 3 years and 3 months, and B/C Ratio 2.76.
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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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