Judul: Dayasaing dan Permintaan Ekspor Produk Biofarmaka Indonesiadi Negara Tujuan Utama Periode 2003-2012
Abstrak: Permintaan obat herbal dunia semakin meningkat, tentunya diperlukan usaha yang lebih intensif agar pasokan bahan baku produk biofarmaka dapat terpenuhi. Penelitian ini bertujuan untuk melihat bagaimana daya saing yang terjadi antardua negara di dunia terhadap penyediaan produk ekspor serta menganalisis faktor yang memengaruhi permintaan ekspor produk biofarmaka dunia terhadap negara tujuan utama. Metode analisis yang digunakan dalam penenelitian ini adalah Revealed Comparative Advantage (RCA), Export Product Dynamics (EPD) dan Gravity Model. Periode waktu yang diteliti adalah rata-rata tahun 2003 hingga 2012. Hasil penelitian menyimpulkan bahwa Indonesia memiliki daya saing yang baik terhadap komoditi kunyit dan kayu gaharu apabila dibandingkan dengan negara pesaing berdasarkan analisis RCA dan EPD dengan posisi daya saing “Lost Oppportunity”. Hasil estimasi faktor yang memengaruhi permintaan produk biofarmaka adalah Real GDP, Real Exchange Rate, Population dan Economic Distance berdasarkan analisis gravity model, seluruh variabel indepeden berpengaruh secara signifikan terhadap dependen dan sesuai dengan hipotesis.
Keyword: ekspor, EPD, Gravity Model, RCA, produk biofarmaka

Judul: Faktor-faktor yang Memengaruhi Ekspor Tanaman Biofarmaka Indonesia
Abstrak: Indonesia as an agricultural country indicate that the agricultural sector has an important role in supporting the national economy . It can be seen from the the growing of Indonesian biopharmaca export to importing countries over the past seven years is tend to increase. The purpose of this paper is to describe the development of the export of Indonesian biopharmaca plants (ginger, turmeric, curcuma), to analyze the factors that affect the volume of exports Indonesian biopharmaca plants (ginger, turmeric, curcuma). The development of Indonesian exports of biopharmaca plants to importing countries during the years 2006-2012 are likely to increase. Overall the factors that influence the export of Indonesian biopharmaca plants is the export prices of Indonesian biopharmaca plants, economic distance, the exchange rate of Rupiah against U.S. dollar, and the export volume of the previous period. Overall the factors that affecting the export of Indonesian biopharmaca plants is export prices, economic distance the exchange rate of Rupiah against U.S. dollar and the export volume of the previous period
Keyword: the volume of exports, tumeric, ginger, curcuma

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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