Judul: Analisis Dayasaing dan Faktor-Faktor yang Memengaruhi Permintaan Ekspor Komoditas Unggulan Perkebunan Indonesia di Uni Eropa.
Abstrak: Dayasaing ekspor komoditas merupakan salah satu indikator yang digunakan untuk mengukur kinerja perdagangan suatu negara. Penelitian ini menganalisis dayasaing ekspor tiga komoditas unggulan perkebunan Indonesia yaitu kelapa sawit, karet, dan kelapa (kopra) terhadap enam negara di kawasan Uni Eropa antara lain Jerman, Spanyol, Yunani, Italia, Belanda, dan Romania dengan melihat keunggulan komparatif dan dinamika ekspor beserta faktor-faktor yang memengaruhinya. Periode analisis dari tahun 2010 sampai 2015 dengan metode Releaved Comparative Advantage (RCA), Export Product Dynamics (EPD), dan Gravity Model dengan menggunakan pendekatan regresi panel data melalui E-views 8. Hasil penelitian ini menunjukkan bahwa komoditas unggulan perkebunan Indonesia memiliki keunggulan komparatif dan berdayasaing kuat. Adapun faktorfaktor yang memengaruhi permintaan ekspor adalah jarak ekonomi, GDP riil per kapita negara tujuan, harga ekspor, Real Exchange Rate (RER), dan trade openness dengan hasil yang berbeda-beda pada tiap komoditas.
Keyword: EPD, gravity model, permintaan ekspor, RCA

Judul: Identifikasi, analisis daya saing, dan faktor-faktor yang mempengaruhi aliran perdagangan komoditi unggulan ekspor Indonesia ke Uni Eropa
Abstrak: The aims of this study are to identify the Indonesia’s main export commodities to the European Union, the level of competitiveness and the degree of integration, and also to determine the trade flow of Indonesia’s main export commodities to the European Union. This study use the sorting method to know the highest export value during the year 2009 as Indonesia's main export commodity to the European Union. Further analysis using the Revealed Comparative Advantage index, Intra-Industry Trade index and gravity model to answer the research objectives. The results showed that Indonesia's main export commodities to the European Union market has a highly competitive and high level of integration. In the aggregate, Indonesia's main export commodities to the European Union market, showed that the flow trade significantly affected by the export of these commodities in the previous year, while the other factors as Indonesia's real GDP (Gross Domestic Product), real GDP of export’s destination countries, GDP per capita of the export’s destination country, real exchange rate of rupiah against the currencies of export’s destination countries, and economic distance has a different level of significance in each commodity.
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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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