Judul: Analisis Tataniaga Tebu (Studi kasus: Kecamatan Trangkil, Kabupaten Pati, Jawa Tengah)
Abstrak: Sugarcane can be used as raw material for the manufacture sugar. Cane farmers crops can be sold to sugar factories to meet the market demand for sugar. Therefore, research is needed to find out about business administration cane sugar in a comprehensive overview of business administration. The purpose of this study is to identify the channel, function, organization, and structure of the market in sugar cane business administration systems, and analyze operational efficiency with a cane trading system trading system margin approach, the farmer's share, and the ratio of benefits to costs. Observations and interviews were conducted to farmers in Sub Trangkil with purposive sampling method, while the method of follow the flow of commodity is done to institutions trading system. The results showed that there is a 4 channel trading system with institutions, functions, and different market structures on each channel. Under margin trading system, the farmer's share, and the ratio of benefits to costs shows one channel trading system is the most efficient channels.
Keyword: sugarcane marketing, Trangkil district, farmer’s share, efficient, efficiency

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: 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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