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 efisiensi ekonomis dan pendapatan usahatani kedelai di lahan pasang surut serta faktor-faktor yang memengaruhinya: studi kasus Kecamatan Berbak, Kabupaten Tanjung Jabung Timur, Provinsi Jambi
Abstrak: Kedelai merupakan komoditas tanaman pangan utama setelah padi dan jagung bagi masyarakat Indonesia. Namun selama lima tahun terakhir, produksi kedelai nasional mengalami penurunan. Penelitian ini bertujuan untuk menganalisis kelayakan pendapatan, nilai efisiensi (teknis, alokatif dan ekonomis) serta faktor-faktor yang memengaruhi produksi dan biaya produksi usahatani kedelai. Metode analisis data yang digunakan adalah R/C Ratio, Fungsi Produksi Cobb Douglas Stochastic Frontier Analysis (SFA) yang menghasilkan nilai Efisiensi Teknis (TE) dan Biaya Fungsi Cobb Douglas Stochastic Frontier Analysis (SFA) yang menghasilkan nilai Efisiensi Alokasi (AE). Dari kedua efisiensi, Efisiensi Ekonomis (EE) diperoleh. Studi ini berfokus di Provinsi Jambi dimana banyak petani kecil yang memproduksi kedelai di daerah marjinal. Hasil penelitian menunjukkan bahwa kedelai pertanian tidak layak dan tidak efisien. Para petani kedelai harus mengelola kembali penggunaan input dan biaya input produksi.
Keyword: Efficiency, Farimng, Jambi, Stochastic Frontier Analysis, Soybean, Food crop, Cpbb Douglass, Soybean farmer, Tidal land, Return to scale

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