Judul: Competitiveness and Affecting Factors of Indonesian Nutmeg Export
Abstrak: The agricultural sector is a sector that makes a huge contribution to the GNP. Nutmeg is one of Indonesia's plantation export commodities that has high economic value. Indonesia's nutmeg export value during the period 2010-2019 quite volatile and there are still several obstacles that cause Indonesia’s nutmeg experienced rejection in destination countries. The objectives of this study are: 1) analyze the competitiveness of Indonesian nutmeg exports; 2) analyze the factors affecting Indonesian nutmeg exports. This study uses RCA, EPD, TII and Diamond's Porter method to determine the competitiveness of nutmeg, and uses a Gravity Model to determine the factors that affect Indonesian nutmeg exports. The RCA's results shows that Indonesian nutmeg has a higher comparative advantage in the six destination countries. The EPD's results are the Rising Star of the United Arab Emirates, the Falling Star of Vietnam and Germany, the Lost Opportunity of China and the Retreat of the United States. TII shows that Indonesia has intense trade relations with China, Vietnam, the Netherlands and the United States. In Diamond Porter's analysis, the supporting industry factors have not been optimal in supporting the competitiveness of Indonesia’s nutmeg exports, while other factors tend to be positive in supporting the competitiveness of Indonesia’s nutmeg. The Gravity Model's results shows that all independent variables have a significant impact on the export value of nutmeg.
Keyword: Diamond’s Porter, EPD, Gravity Model, RCA, TII

Judul: Analisis Dayasaing dan Faktor-faktor yang Memengaruhi Aliran Ekspor Pala Indonesia
Abstrak: Development of export demand for Indonesia nutmeg on international market can be identified by the rate of its export volume. The objective of this study was to analyzing comparative and competitive advantage of indonesia nutmeg in six export destination countries, there are Netherland, Belgium, Germany, Italy, USA and Singapore and what the factor influences the export volume of Indonesia nutmeg. RCA method showed that comparative advantage held by indonesia nutmeg on the whole export destination countries (RCA>1). The result of Export Product Dynamic (EPD) showed that the Indonesia nutmeg has a high competitive advantage on Netherland, Italy, USA and Germany market and at the same time share of export has decreased on Belgium and Singapore market. There is twoway trade on Netherland, Singapore, Belgium and Italy. This result can be determined by analyzed using Intra-Industry Trade method (IIT). The estimation result of Gravity Model showed that real economic distance and real prices of world’s nutmeg influences export volume of indonesia nutmeg.
Keyword: Gravity model, IIT, EPD, 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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