Judul: Analisa efesiensi tataniaga kedelai di Kabupaten Jember, Jawa Timur
Abstrak: This field study report aims t o look through the marketing efficiency of soybean produced by farmer at ICabupaten Jember, East Java. The collected data is analysed by calculating the correlation of marketing margin at the farmer level and consumer" price. The result of this study shown that the existed marketing system worked effectively, it means that the distributions channels smoothly beginning from the farmelp efforts to consumers. The market where the marketing organization works is nearly perfect competition market. In this case, the increasing price at the consumer level was not received yet by the farmer. There is still a profit upon the normal profit satisfied by the middlemen for each kilogramme of soybean. However, the farmer has been avoided from too lower selling price. As there are competitions among the village trade*, the market price information given by the government through broadcasting and informations to other farmer who sell their soybean to subdistrict, it caused the farmer to avoid the lower selling price.
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Judul: Analisis Sistem Tataniaga Kedelai di Desa Cipeuyeum, Kecamatan Haurwangi, Kabupaten Cianjur
Abstrak: Soy is the third most important food crop in Indonesia after rice and corn. Demand for soy in Indonesia has increased every year. Until now, Indonesia has been unable to meet the national demand for soy. This inability can be overcome by improving soy agribusiness system where marketing system is one aspect that needs to be fixed. Improvement of the marketing system aspect can be started from the central areas of soy production. West Java is the fifth province with the largest value of soy productivity in Indonesia. Cipeuyeum village, Cianjur regency is one of soy producing area in West Java. There are four channels of marketing system in this village with five institutions tha identified with the snowball method. This marketing system institutions perform each functions and face the diverse market structures. Quantitative analysis showed the most efficient channel with Rp917.00 for the marketing margin, 85.89% for the farmer’s share value, and 7.06 for ratio of profit to cost.
Keyword: soy agribusiness, marketing, efficient, demand for soy, Cipeuyeum village

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology