Judul: Daya Saing dan Determinan Ekspor Udang Beku Indonesia di Negara Tujuan Ekspor
Abstrak: Frozen shrimp is one of Indonesian export commodities that has the biggest shares on total fisheries export. Indonesia is the fourth biggest exporters of frozen shrimp in the world. However, it didn’t mean that competitiveness is high too. Hence, the purposes of this research are to analyze competitiveness and market position of frozen shrimp and to analyze the determinant of export of frozen shrimp in the world, especially on 15 countries from 2004-2013 using gravity model analyzed by static data panel. RCA (Revealed Comparative Advantage) analysis shows that frozen shrimp Indonesia has high comparative advantage on all destination countries except Spain. EPD (Export Dynamic Product) analysis shows that market position is rising star only in United States. Meanwhile, market position is in lost opportunity in nine destination countries and the rest is in retreat. Based on gravity model, it is shown that the increasing on GDP real per capita of destination country, frozen shrimp price of rival country, and economics distance have positive effect on frozen shrimp export. Meanwhile, the increasing on GDP real per capita of Indonesia, frozen shrimp price of Indonesia, and real exchange rate have negative effects on frozen shrimp export.
Keyword: Bogor Agricultural University, volume of export., RCA, market position, gravity model, EPD

Judul: Competitiveness and Factors Affecting Indonesian Shrimp Exports to Main Destination Countries
Abstrak: Penelitian ini bertujuan menganalisis daya saing dan faktor-faktor yang memengaruhi volume ekspor udang Indonesia ke negara-negara tujuan utama. Komoditas yang menjadi objek pada penelitian ini adalah udang beku dan udang olahan. Daya saing dianalisis menggunakan metode Revealed Comparative Advantage (RCA) sedangkan faktor-faktor yang memengaruhi ekspor dianalisis menggunakan gravity model, dalam kurun waktu 2005-2019. Udang beku dan udang olahan Indonesia memiliki daya saing di negara tujuan utama. Variabel yang signifikan memengaruhi volume ekspor udang beku dan udang olahan Indonesia adalah Gross Domestic Product (GDP) riil per kapita Indonesia, Gross Domestic Product (GDP) riil per kapita negara tujuan, jarak ekonomi, harga udang, kebijakan tarif bea masuk, dan kebijakan non tarif, sedangkan nilai tukar tidak berpengaruh signifikan., This study aims to analyze the competitiveness and the factors that influence the volume of Indonesian shrimp exports in the main destination countries. The commodities that are the object of this research are frozen shrimp and processed shrimp. Competitiveness is analyzed using the method Revealed Comparative Advantage (RCA)while the factors that affect exports are analyzed using the gravity model, in the period 2005-2019. Indonesian frozen and processed shrimp have competitiveness in the main destination countries. Variables that significantly affect the export volume of frozen and processed shrimp in Indonesia are the real Gross Domestic Product (GDP) per capita of Indonesia, the real Gross Domestic Product (GDP) per capita of the destination country, economic distance, shrimp prices, import duty tariff policies, and non-tax policies. Rates, while the exchange rate has no significant effect.
Keyword: Daya saing, Ekspor udang, Gravity model, RCA

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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