Judul: Faktor-Faktor yang Memengaruhi Produksi Hortikultura di Indonesia
Abstrak: Horticulture is one of the agricultural subsectors which contributes the Indonesian GDP because of its role as source of livelihood for rural communities. The largest production quantities of horticultural commodities which spread throughtout the whole provinces in Indonesia are bananas, papayas, oranges, pineapples, tomatoes, peppers and potatoes. In addition, Indonesian climate supports its fruit and vagetable crops with unique characteristics and certain position to domestic and foreign consumers. However, every province in Indonesia has distinct characteristic that differs the crops production in each region. The purpose of this research is to analyze the Indonesian horticulture production and the affecting factors by using panel data method in 2003-2012 period. The result shows that West Java is a production center of bananas, tomatoes, peppers and potatoes. While the North Sumatera province as main producer for oranges, Lampung province is a production center of pineapples and East Java is a production center of papayas. Whereas, horticulture production is mostly affected by some factors, which are producer prices (HP), wage (UPAH), fertilizer (PUPUK) and labor (TK).
Keyword: Production., Horticulture, Panel data

Judul: Daya Saing Ekspor Komoditi Hortikultura Indonesia di Pasar ASEAN
Abstrak: Horticulture is one of agricultural sub sector of Indonesia which has quite good potential in international market, such as ASEAN. The objectives of this research are to analyze condition and the competitiveness position of Indonesian horticultural commodities in ASEAN’s market, also to formulate strategy which leads to increase the export competitiveness of Indonesian horticulture. The export competitiveness of Indonesian horticulture is analyzed using Revealed Comparative Advantages, Export Competitiveness Index, and Acceleration Ratio methods. The examined commodities in this research are cut flowers, mangoes, mangosteens, guavas, avocadoes, watermelons, potatoes, tomatoes, gingers, and curcumas. Considering the classification based on the analysis, we can coclude that commodities which have export competitiveness are mangoes, mangosteens, guavas, avocadoes, watermelons, potatoes, gingers, curcumas, and cut flowers, whereas tomatoes have less export competitiveness in ASEAN’s market
Keyword: horticulture., export competitiveness, ASEAN

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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