Judul: Pengaruh Risiko Produksi Terhadap Keuntungan Usaha Pembenihan Ikan Lele di Kecamatan Pagelaran Kabupaten Pringsewu Provinsi Lampung
Abstrak: Survival Rate (SR) is an indicator of the risk of catfish hatchery production. The research aims to analyze the influence of production risk to farmer sales revenue at Pagelaran Subdistrict and also to knowing farmer preference to production risk which is decreased production drastically. Based on the research, SR can influence sales revenue because the number of fish that are harvested determine the magnitudes of the sales revenue. If the SR is low, the the income also low. However, if the SR is high, the the income getting high. The SR value at risk condition is 56 percent of Sangkuriang Catfish is higher compared with Dumbo Catfish SR that amounted to 38 percent.SR normal is 90 percent. So the Sangkuriang sales revenue is bigger than the Dumbo which has Rp3 811 487 net income value. There are three preference do farmer when facing the drastically decreased production or SR close to zero persen because of the mass death, the first is continued efforts by directly doing the spawning cycle for the next, the second is choose to temporarily stop the production and the third is swith on other commodities.
Keyword: sales revenue and farmer preference, SR, risk production, catfish

Judul: Analisis Risiko Produksi Pembenihan Ikan Lele Sangkuriang Pada Saung Lele di Kampung Jumbo Sukaraja Kabupaten Bogor
Abstrak: Catfish was one of the consumption fish that has been cultured in Indonesia which has good prospect. The high number of catfish consumption demand, causing the request of catfish seed increasing. Bogor regency was the largest catfish-producing region in the province of West Java and has been designated to be regional aquaculture minapolitan region. Bussiness who work in the breeding of catfish om Bogor regency was Saung Catfish. Entrepreneur was faced with the SR fluctuation problem that indicate a risk of production. In identifying the sources of risk was used descriptive method. Quantitative methods used in counting probability using the Z-score and calculate the impact of using VaR. Sources of production risks contained in catfish hatchery business Sangkuriang at Saung Catfish were pests, disease, water quality, and cannibalism. The analysis result of the probability or the possibility risk arise, i.e. : 1) the pest by 35.6 percent, 2) disease of 29.1 percent, 3) water quality by 40.5 percent, and 4) cannibalism of 34.1 percent. The analysis results of the risk impact, i.e : 1) pest as much Rp. 793 146, 2) disease in amount of Rp. 734 049, 3) water quality of Rp. 1,075,684, and 4) cannibalism in amount of Rp. 956,926. Risk production management strategies for pest risk source, water quality, and cannibalism was by prevention. While the source of risk on disease was handled by manage the maintenance medium properly.
Keyword: 

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