Judul: Comparative Analysis of Marketing Channels of Cayenne Pepper through Auction Market and Other Channels in Turi District Sleman Regency
Abstrak: Turi District is one of cayenne pepper production areas in Sleman Regency. The marketing of Cayyene Pepper is interesting to study especially after the chili auction market was established in Sleman Regency in 2018. Therefore, this study aims to compare the marketing of cayenne pepper through the auction market marketing channel with other marketing channels in Sleman Regency based on marketing margin, farmer’s share, and profit ratio to marketing cost. The data collection methods were purposive sampling method applied on farmers and snowball sampling method applied on marketing organization. The results showed that were five kinds of Cayenne Pepper marketing channels in Turi District with two marketing channels through the auction market. The channel through the auction market has a larger sales volume and facilities that make it easier for farmers, such as providing close gathering points and providing production facilities for farmers. Marketing channel through the wholesaler has a higher purchase price at the farmer level than the auction market.
Keyword: Auction Market, Cayenne pepper, Marketing Channels

Judul: Analisis Sistem Pemasaran Beras Ciherang di Kecamatan Cibeber, Kabupaten Cianjur
Abstrak: Rice is the basic commodity that became the staple food for the Indonesian. The purposes of this research were analyzing marketing channels, function, structure and marketing institutions of farmer Ciherang Variety in Cibeber Subdistrict. Beside that, the purposes of this research were analyzing the marketing efficiency by marketing margin, farmer’s share and benefit cost ratio approaching. The research was conducted in 3 villages that are Cisalak, Karangnunggal, Salamnunggal with 30 farmers as the respondents and there are 7 marketing institutions in the subdistrict. Generally, the market structure in this subdistrict is oligopsonistic . Based on the marketing function and the profitable ratio about marketing cost, the channels that through farmers-middlemen-major collector and rice mills in village-retailer-consumer rice in Jakarta is the most efficient channels. The farmer should have made farmer groups or cooperation as part of the marketing system to improve the bargaining position and easier capitalization like through the warehouse system in Cianjur.
Keyword: Rice, Marketing Margin, Farmer’ 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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