Judul: Analisis Daya Saing dan Determinan Ekspor Produk Kelapa Sawit (CPO dan RPO) Indonesia ke Negara Tujuan Utama
Abstrak: Indonesia adalah negara eksportir terbesar kelapa sawit di dunia. Namun, volume ekspor CPO Indonesia cenderung menurun sedangkan volume ekspor RPO meningkat periode 2006-2021.Tujuan penelitian ini adalah untuk mengidentifikasi daya saing dan determinan ekspor produk kelapa sawit Indonesia CPO (HS 151110) dan RPO (HS 151190) ke negara tujuan utama. Metode yang digunakan dalam penelitian adalah RCA, EPD, X-Model, dan regresi data panel. Hasil penelitian menunjukkan CPO dan RPO memiliki daya saing yang kuat. Hasil EPD adalah CPO Indonesia memiliki pangsa pasar rising star, lost opportunity, falling star, dan retreat sedangkan RPO rising star pada delapan negara tujuan. Hasil regresi data panel pada CPO menunjukkan bahwa harga ekspor, jarak ekonomi, nilai tukar riil, dan populasi negara tujuan berpengaruh signifikan terhadap volume ekspor CPO Indonesia. Variabel harga ekspor, nilai tukar riil, populasi, dan dummy hilirisasi kelapa sawit memiliki pengaruh signifikan terhadap volume ekspor RPO Indonesia., Indonesia is the largest exporter of palm oil in the world. However, the volume of Indonesian CPO exports tends to decrease while the volume of RPO exports increases in the 2006-2021 period. The aim of this research is to identify the competitiveness and determinants of exports of Indonesian palm oil products CPO (HS 151110) and RPO (HS 151190) to the main destination countries. The methods used in this research are RCA, EPD, X-Model, and panel data regression. The research results show that CPO and RPO have strong competitiveness. The results of the EPD show that Indonesian CPO has a rising star market share, lost opportunity, falling star and retreat, while RPO is a rising star in eight destination countries. The panel data regression results on CPO show that export prices, economic distance, real exchange rates, and populations of destination countries have a significant effect on Indonesia's CPO export volume. The variables of export prices, real exchange rates, population, and dummy palm oil downstream have a significant influence on the export volume of Indonesian RPO.
Keyword: competitiveness, CPO, export, panel data, RPO

Judul: Analisis Daya Saing dan Perdagangan Produk Ekspor Kelapa Sawit Indonesia di Pasar Internasional
Abstrak: Indonesia is the largest producer of palm oil products in the world, with a production of about 44.46 percent of the total world production. Exports of palm oil products driven from the demand side, namely the growth in world consumption is equal to 3 percent per year. Although the quantity of export of palm oil products showed an increase, but starting in 2011, a change in the composition of exports of Indonesian palm oil products, namely the export of processed products or Refinery Palm Oil (RPO) increased, whereas Crude Palm Oil (CPO) decreased. This happens due to the impact of the progressive establishment of export duty on palm oil products, which began in 2007. The trend of increasing exports of Indonesian palm oil products and increased consumption of palm oil world, demonstrates the potential exports of palm oil products market is still high in the international market. The volume of exports of palm oil products in the international market is determined by the competitiveness of export products of palm oil and other determinants. To that end, the purpose of this study are: (1) analyze the competitiveness and the level of competition Indonesian palm oil export products in the international market and (2) analyze the factors that affect the flow of trade in products of Indonesian palm oil exports as well as the potential for trade in the international market. Secondary data were used in the form of panel data is a merger between the data time series and cross section. The analysis method used in this study were: (1) descriptive analysis, (2) analysis of the competitiveness of the method of Revealed Comparative Advantage (RCA), (3) Spearman rank correlation analysis, (4) analysis of panel data with gravity models, and ( 5) analysis of the ratio of trade potential. Research results indicate that the export product trade Indonesian palm oil in the international market has the highest comparative advantage for CPO (average value of 64.72 RCA) and the lowest for the RPO (average value of 32.37 RCA), although seen from the RCA all products Indonesian palm oil exports show has a comparative advantage. Based on the analysis of competitiveness, Indonesia has a negative correlation with Malaysia's CPO and RPO market. The variables that significantly influence the volume of Indonesian CPO exports include Indonesia's real GDP per capita, real GDP per capita of the country of destination, within the Indonesian economy with the country of destination and the exchange rate against the local currency unit (LCU). While the variables that are not significant to the CPO export volume is a progressive export tax on palm oil products. RPO model, the variables that significantly affect Indonesia's per capita real GDP, real GDP per capita of the country of destination, the rupiah against the LCU, and a progressive export tax. While the variables that are not significant to the export volume RPO is the distance of the Indonesian economy with the country of destination. Indonesian CPO trade potential ratio shows that the trade is still under trade and potentially increase in the future is the China, Netherland,
Keyword: competitiveness, exports, gravity models, palm oil

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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