Judul: Analisis Faktor-faktor yang Memengaruhi Respon Produksi Kakao di Indonesia
Abstrak: Cocoa (Theobroma cacao) is a plant from South America. Cocoa is one of the plantation pledge commodity whose role quite important for the national economy, particularly as a provider of employment, sources of income and foreign exchange (Ministry of Industry 2007). Cocoa contributed the largest foreign exchange to Indonesia's exports after oil palm. Foreign exchange value of cocoa amounted to U.S. $ 1,345.3 million with a volume of 440 thousand tons in 2011. The purpose of this study was to analyze factors that affect response cacao production in Indonesia and saw developments of cocoa in Indonesia. This study uses quantitative and descriptive analysis. Quantitative analysis which used to analyze the factors which affect the production of cocoa in Indonesia is OLS (ordinary least square). Results of the OLS analysis indicates that response cocoa Production affected by the total area of cocoa, crisis and the production previously.
Keyword: OLS, Cocoa, Response Production

Judul: Analisis Respon Penawaran Kakao Menurut Status Pengusahaan Dan Wilayah Produksi Di Indonesia
Abstrak: Ekspor kakao Indonesia sejak awal PELITA I sampai dengan PELITA IV meningkat terus, tetapi pangsanya relatif kecil dibandingkan total ekspor kakao komperatif dunia. yang dimiliki kakao Indonesia Keunggulan seperti: harga pokok yang relatif rendah, tersedianya lahan, tenaga kerja dan adanya kestabilan politik, merupakan faktor penunjang untuk mengembangkan tanaman kakao sebagai komoditi ekspor. Penelitian bertujuan untuk melihat pengaruh faktor ekonomis seperti harga kakao, harga kopi, dan faktor non ekonomis seperti curah hujan, hama penyakit dan kebijaksanaan pemerintah terhadap perilaku petani perkebunan besar dan perkebunan rakyat di dalam menentukan areal tanam dan produksi kakao. Data yang digunakan seluruhnya berupa data sekunder yang berasal dari kepustakaan dan dari publikasi-publikasi dari selama instansi terkait. Pengamatan data secara urut waktu periode waktu 21 tahun terhitung sejak tahun 1967 sampai dengan 1987. Penelitian ini mengambil enam wilayah contoh secara sengaja, dengan pertimbangan wilayah terbut merupakan wilayah sentra produksi. Enam wilayah tersebut adalah tiga wilayah di Indonesia Bagian Barat (IBB) dan tiga wilayah di Indonesia Bagian Timur (IBT). Analisis dilakukan secara diskriptif kuantitatif dengan bantuan pendekatan ekonometrika dan analisis model linier. Hasil penelitian menunjukkan bahwa perilaku petani perkebunan rakyat dalam menentukan areal tanam di wilayah IBB lebih responsif terhadap faktor ekonomis dibandingkan dengan perilaku petani perkebunan rakyat di IBT. Hal tersebut disebabkan karena kondisi transportasi, prasarana dan sarana wilayah IBT tidak memadai…dst
Keyword: Cocoa Offer, Geometric Models, Geometric Models, Cocoa Prices

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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