Judul: Faktor-faktor yang mempengaruhi ekspor buah-buahan Indonesia ke China
Abstrak: Pola makanan yang sehat tidak akan terlepas dari buah-buahan. Buah-buahan rnerupakan makanan yang banyak mengandung vitamin dan serat sehingga baik untuk Behatan tubuh dm sistern pencemaan manusia. Berdasarkan ha1 tersebut lid& lxeran #a buah-buahan merupakan salah satu komoditas yang diminati di seluruh dunia. &rdagangan mkr ncgara pun terjadi untuk memenuhi permintaan masyarakat 6Atasing-masing Itcgara akan budl-buahan. 3 Untuk meningkatkan nilai ekspor buah-buahan, Indonesia berusaha untuk demperhatikan kualitas clan kelahanan produk ekspomya agar tetap ditcrilna cli pasar 3ernasional. Saat ini Indonesia bemsaha Fokus pa& ncgara-negasa yeug ~ncmilki Emlah penduduk yang tinggi dan yang terpenting sekali negara tersebut scringlrali i#eocri~no pnnluk impor dari bir~oonosia Saleh satu ncgara yang potensial untuk itu alalah China. China sebagai salah satu negara yang memiliki jurnlah penduduk terbesar $i dunia, rneruptkan pasar yang potensial bagi ekspor buah-buahan Indonesia.
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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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