Judul: Analysis of the Performance of Indonesian Jewelry Exports to the Destination Country
Abstrak: Perhiasan adalah salah satu komoditas andalan yang meningkatkan nilai ekspor negara, juga merupakan komoditas unggulan Indonesia yang memiliki pangsa pasar yang cukup besar di beberapa negara tujuan ekspor. Penelitian ini bertujuan untuk menganalisis kinerja ekspor perhiasan Indonesia dengan kode HS 7113 dari tahun 2010 sampai 2019 ke negara tujuan ekspor yang terbatas pada enam negara tujuan. Metode analisis digunakan adalah RCA dan EPD untuk menganalisis daya saing atau keunggulan komparatif komoditas perhiasan Indonesia dan posisi pangsa pasar ekspor ke negara tujuan, serta gravity model untuk menganalisis faktor-faktor yang memengaruhi ekspor perhiasan Indonsia. Hasil penelitian menunjukkan bahwa Perhiasan Indonesia relatif kompetitif di beberapa negara tujuan ekspor, sementara komoditas perhiasan Indonesia secara keseluruhan memiliki posisi pasar pada kuadran Falling Star. Sedangkan hasil estimasi gravity model menunjukkan bahwa Variabel GDP Negara Tujuan, GDP Indonesia, Harga Ekspor berpengaruh positif dan signifikan terhadap ekspor perhiasan Indonesia, sementara Nilai Tukar Riil dan jarak ekonomi berpengaruh negatif dan signifikan terhadap ekspor perhiasan Indonesia di enam negara tujuan., Jewelry is one of the mainstay commodities that increase the country's export value. It is also Indonesia's leading commodity which has a large enough market share in several export destination countries. This study aims to analyze the export performance of Indonesian jewelry with the HS code 7113 from 2010 to 2019 to export destination countries which are limited to six destination countries. The analytical methods used are RCA and EPD to analyze the competitiveness or comparative advantage of Indonesian jewelry commodities and the position of the export market share to the destination country, as well as a gravity model to analyze the factors that influence Indonesian jewelry exports. The results show that Indonesian jewelry is relatively competitive in several export destination countries, while Indonesia's jewelry commodities as a whole have a market position in the Falling Star quadrant. Meanwhile, the estimation results of the gravity model show that the variabel GDP of the Destination Country, Indonesia's GDP, Export Prices have a positive and significant effect on Indonesia's jewelry exports, while the Real Exchange Value and economic distance have a negative and significant effect on Indonesia's jewelry exports in the six destination countries.
Keyword: Export, EPD, Gravity Model, Jewelry, RCA

Judul: Analisis Faktor-faktor yang Memengaruhi Permintaan Perhiasan Indonesia di Negara Tujuan Ekspor
Abstrak: Perhiasan merupakan salah satu produk potensial ekspor Indonesia. Secara umum, ekspor perhiasan ke negara tujuan menunjukkan kecenderungan berfluktuasi. Oleh karena itu, perlu dilakukan penelitian mengenai seberapa besar pengaruh faktor luar seperti GDP per kapita negara tujuan, harga ekspor perhiasan Indonesia, harga ekspor perhiasan negara pesaing, populasi negara tujuan, dan nilai tukar riil rupiah terhadap permintaan ekspor perhiasan Indonesia. Penelitian ini menggunakan data panel, yang merupakan gabungan data time series rentang waktu 2000-2011 dan data cross section yaitu tujuh negara tujuan ekspor utama. Data dianalisis menggunakan model Fixed Effect. Hasil penelitian menunjukkan bahwa (1) nilai ekspor perhiasan Indonesia menunjukkan tren yang positif, namun volume ekspor perhiasan Indonesia menunjukkan adanya fluktuasi; (2) faktorfaktor yang memengaruhi permintaan ekspor perhiasan Indonesia yaitu GDP per kapita negara tujuan, harga ekspor perhiasan Indonesia, populasi negara tujuan, dan nilai tukar riil rupiah.
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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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