Judul: Faktor-faktor Produksi yang Memengaruhi Output Budidaya Udang Vanamei Indonesia
Abstrak: The major expor commodities of Indonesian fisheries is shrimp. Vannamei shrimp is the largest shrimp seeds are stocked in brackish water pond culture. Because of that, this research focuss in Production Factors that Influence the Vannamei Shrimp Aquaculture’s output in Indonesia. This research uses Cobb- Douglass production function approach with analytical methods of engle-granger cointegration and error correction model (ECM). The result are all variables have increasing trend for 1999 to 2012. All variables have a positive and significant impact on Vannamei Shrimp Aquaculture’s output in long term. In the short term, just variabel of fertilizer that hasn’t impact on Vannamei Shrimp Aquaculture’s output. Seed is the highest variable that influence Vannamei Shrimp Aquaculture’s output not only in long term but also in short term. Besides that, returns to scale of vannamei shrimp aquaculture is in the area of Increasing Return to Scale (IRTS).
Keyword: vannamei shrimp, increasing return to scale, Cobb- Douglass production function, error correction model (ECM), Engle-granger cointegration

Judul: Analisis Faktor-Faktor yang Mempengaruhi Produksi dan Pendapatan Budidaya Tambak Udang Vaname di Kecamatan Pasekan Kabupaten Indramayu
Abstrak: Vannamei Shrimp (Litopeanus vannamei) is one of shrimp variety that cultivated in Indonesia. Shrimp is the main export commodity of fishery production in Indonesia. In this country, Vannamei Shrimp is cultivated intensively and traditionally. One of productive regional that yields Vannamei Shrimp is in Indramayu Regency. In one of Subdistrict of Indramayu, Pasekan, Vannamei Shrimp are most traditionally cultivated. The aims of this research are the production factors that have influences toward Vannamei Shrimp fishpond’s production and to analyze the ratio of Vannamei Shrimp fishpond’s income based on the capital finance sources, theyare personal capital finance and capital finance that debt from middleman. Based on the double linier regretion estimate, the factor that influence Vannamei Shrimp fishpond’s production are feed (kilograms), fuel (liter), and the period of cultivation (days). According to the income analysis, in found that the value of R/C ratio > 1 for all cultivations, either of cultivation by personal capital finance or cultivation by personal capital finance or cultivation whit financial source by lending from middleman. The R/C ratio value of farmers who cultivate shrimp by their one capital finance are smaller than farmers who get their capital finance fram middleman. It means that farmwe who use financial from middleman are more afficient. Based on the results of research, to increase production Vannamei Shrimp, increase the use of feed vaname, solar and duration of maintenance Vannamei Shrimp. In accordance with the Department of Fisheries and Marine programs Indramayu Regency regarding counseling, guidance regarding the use of the addition of feed, fuel, and period of cultivation in Vannamei Shrimp can be intensively. Cooperation between the Department of Fisheries and Marine programs Indramayu District to middleman in terms of the use of production inputs can be done to increase the production level Vannamei Shrimp cultivators.
Keyword: Vannamei Shrim, traditionally fishpond, production factor, income analysis

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