Judul: Sistem Pemasaran Gula Tebu (Cane Sugar) dengan Pendekatan Structure, Conduct, Performance (SCP) [Kasus: Perusahaan Perseroan (Persero) PT.Perkebunan Nusantara VII Unit Usaha Bungamayang]
Abstrak: Fluctuations international prices of cane sugar have an impact on the price of cane sugar in the country. One of the areas that became centers of production of cane sugar that sense changes in the international price of cane sugar Provinsi Lampung. The uncertainty of the price risk to the marketing agency involved. The general objective of this research is to analyze the marketing system of cane sugar approach to structure, conduct, performance (SCP) to the case in PTPN VII Unit Usaha Bungamayang. Research results indicate that the market structure facing the market is concentrated with a small level of competition and have barriers to entry for competitors. Market structure in Provinsi Lampung is oligopoly. Analysis of market behavior in the determination and formation of prices is still dominated by one of the marketing agencies. Market behaviour in PTPN VII UU BUMA have a marketing colution when the fixed prices by large salers. Market performance analysis shows that changes in the price of sugar cane at the consumer level is not transmitted to farmers. The results indicate that analysis of cane sugar marketing system in PTPN VII UU BUMA likely more advantages large salers than farmers. The farmers are price taker in the short run and long run.
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Judul: Analisis Tataniaga Tebu, Desa Pintu, Kecamatan Jenangan, Kabupaten Ponorogo, Jawa Timur
Abstrak: Sugarcane is one of the 15 national main commodities to support plantation development goals from 2010 to 2014. The purpose of this study are to identify the marketing channel, function, institution, market structure and market behavior, and to analyze the operational efficiency of trading sugarcane system with margin trading system approach, the farmer's share, and the ratio of benefit to cost. Observation and interview were performed with the purposive method for farmers in the Pintu Village, while the snowball method was performed for institution trading system. The result showed that there were four trading channels system. Based on margin trading system, the farmer's share, and the ratio of benefit to cost trading system shows that the channel one is the efficient channel to direct sales from farmers to sugar factory and channel four is an efficient channel sales through middlemen.
Keyword: sugarcane marketing, Pintu Village, farmer's share, Efficiency

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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