Judul: Kelayakan Pengusahaan Buah Tin (Ficus carica) Kebun Jogja Ara Garden di Yogyakarta.
Abstrak: Tin merupakan tanaman asal Mediterania yang saat ini mulai diusahakan di Indonesia. Salah satunya berada di Jogja Ara Garden, Provinsi Yogyakarta. Tujuan dari penelitian ini adalah menganalisis kelayakan pengusahaan tin Jogja Ara Garden berdasarkan aspek nonfinansial, aspek finansial, tingkat sensitivitas, dan switching value. Analisis kelayakan pengusahaan tin terdiri atas tiga skenario, yaitu skenario I (pembibitan), skenario II (produksi buah), dan skenario III (pembibitan dan produksi buah). Berdasarkan aspek nonfinansial (aspek pasar, aspek teknis, aspek manajemen dan hukum, aspek sosial, ekonomi, dan budaya, serta aspek lingkungan) dan aspek finansial (NPV, Net B/C, IRR, dan payback period) bahwa usaha tin Jogja Ara Garden layak untuk dijalankan. Tingkat sensitivitas usaha dilihat berdasarkan penurunan produksi tin dan peningkatan harga pupuk NPK mutiara.
Keyword: nonfinansial, finansial, sensitivitas, switching value

Judul: Kandungan Gizi Buah Tin (Ficus carica L.) Produksi Indonesia
Abstrak: The aim of this study was to identify the nutritional content of fig fruits including macro and micro nutrient, antioxidant, phytochemical, as well as the panelis preferenees. Three varieties of figs from “Sentra Tin” Bekasi were used in this study i.e Green Yordan, Purple, and Negronne. The macro nutrient content of figs were as follow (% wb) moisture 86.34, 80.57, 82.10, ash 0.75, 0.86, 0.96, protein 1.45, 1.48, 1.91, fat 0.14, 0.22, 0.56, crude fiber 2.30, 2.18, 2.77, total carbohydrate 9.01, 14.67, 11.70, and reducing sugar 1.70, 3.00, and 4.66 respectively. The micronutrient content were as follow (mg/100g) sodium content 2.11, potassium content 854.05, calcium content 104.79, and zink 1.10 respectively. Total phenolic content were as follow (mgGAE/100g) 20.28, 10.38, 28.72 respectively. The three fruits content antocyanin were as (μg/g) 61.48, 59.93, 156.29. Antioxidant of Green Yordan and Negronne are very active (mg) 29.75 and 39.75 respectively. Green Yordan is the most prefered by the panelis with percentage of acceptability 93.33%. The nutritional content of fig cultivated in Indonesia were compared with the production in other country or origin.
Keyword: nutritional composition, Indonesia, fig fruit, antioxidant

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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