Judul: Faktor-faktor yang mempengaruhi permintaan benih semangka impor di PT Sang Hyang Seri, Jakarta
Abstrak: Sebelum tahun 1980-an, semangka merupakan buah yang eksklusif, karena hanya tersedia di tempat-tempat tertentu. Untuk bisa mengkonsumsinya bahkan Indonesia harus mengimpornya. Sejak diberlakukannya SK Menteri Pertanian No 505 th. 1982 tentang pembatasan buah impor, maka impor buah termasuk semangka pun dibatasi. Hal ini menbuat para petani menanam buah-buahan dengan benih dari eks-buah impor. Oleh karena itu, saat ini semangka yang banyak beredar di pasaran memang merupakan hasil penanaman dengan menggunakan benih impor.
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Judul: Faktor-faktor yang Mempengaruhi Permintaan Impor Buah-buahan dan Sayuran Indonesia
Abstrak: Indonesia as a country with a large population has become one of the destination countries for trade. Free trade agreements among countries in exempting tariff duty of goods from overseas can cause excessive imports of agricultural commodities which increase from year to year. The purposes of this study were (1) To analyze the development of commodity imports of fruits and vegetables in Indonesia; and (2) To analyze the factors that affect the demand for imports of fruits and vegetables in Indonesia. The development of Indonesian imports of fruits and vegetables from the exporting countries during the period of 2006-2010 tended to increase. Overall, the factors that affect the demand for fruit imports to Indonesia included the imported fruit prices, index of industrial production, import lag, exchange rate of rupiah against the U.S. dollar and supply of mangoes at the Central Market of Keramat Jati. The economic distance variable did not significantly affect the demand for imported fruits in Indonesia. The factors that affected the demand for Indonesia as a whole included the imported vegetable prices, index of industrial production, U.S. dollar, import lag and economic distance.
Keyword: vegetables, import demand, fruits

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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