Judul: Analisis Risiko Produksi Pembesaran Ikan Hias Neon Tetra (Studi Kasus di Pengusaha Bapak Rodi, Kecamatan Bojongsari, Kota Depok)
Abstrak: Indonesia is the archipelago country and well-known in the world, So it supports the fisheries sector and has the potential for economics development as maritime country and nation. One of these, is the non-consumption of fishery products business in Indonesia, in particulary is a commodity of ornamental fish. It has developed quite rapidly besides having promising prospects economically. The Objective of this study is to identify a source of risk production and to analyze probability and impact of risk production in the rearing operational business of ornamental fish neon tetra owned by Mr. Rodi. The analytical method used is the analysis of risk management and risk analysis based on the size of the Expected Return approach, variance, standard deviation, and coefficient of variation. The result Based on the risk assessment on the production of ornamental fish rearing business neon tetra obtained the expected return value is 84.77 for a single period. That Means is Mr. Rodi can expect as much the result of the acquisition of 84.77 per cent survival rate in this enlargement effort for each harvest period. The coefficient of variation values obtained results of 0.20. In other words, for every one percent success rate ornamental fish neon tetra obtained will have a risk of 0.20 percent at the time of production risk. Some things that can be done is to make investments in the form of a purchase thermometers and pH meters tool that checks the temperature and pH can be done routinely.
Keyword: coefficient variation, standard deviation, variance, Expected Return, Survival rate, Neon Tetra

Judul: Analisis Faktor-faktor yang Mempengaruhi Risiko Produksi Benih Ikan Neon Tetra di Kecamatan Bojongsari, Kota Depok.
Abstrak: Petani pembenihan ikan hias neon tetra di Kecamatan Bojongsari menghadapi risiko yang berasal dari penggunaan faktor-faktor produksi. Tujuan penelitian ini adalah menganalisis pengaruh faktor produksi terhadap risiko produksi yang dihadapi petani pembenihan ikan neon tetra di Kecamatan Bojongsari. Penelitian ini mengambil 33 sampel petani di Kecamatan Bojongsari dengan menggunakan purposive sampling sebagai metode penentuan sampel sedangkan metode analisis data menggunakan model Just and Pope. Hasil perhitungan menunjukkan bahwa artemia, kutu air saring, dan tenaga kerja meningkatkan produktivitas secara nyata, sedangkan obat-obatan menurunkan produktivitas secara nyata. Peningkatan penggunaan artemia dan tenaga kerja meningkatkan risiko produksi secara nyata (risk inducing factors), sedangkan indukan dan obat-obatan menurunkan risiko produksi secara nyata (risk reducing factors).
Keyword: Just dan Pope, neon tetra, risiko produksi

Judul: Metrik Einstein (Anti-) Self-Dual Berdimensi Empat dengan Metode Cartan
Abstrak: Gravitational field equation can be formulated in differential forms (differential geometry), which describes gravity as a manifestation of the curvature of space-time. Curvature of space-time is characterized by a metric that satisfies the gravitational field equation. With differential forms it can be formulated the (anti-) self-dual Einstein equation, which is a modification of the Cartan structure in (anti-) self-dual basis. Calculation of (anti-) self-dual metric with (anti-) self-dual Einstein equation is simpler than the calculation using Christoffel symbols.
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