Judul: Analisis Sumber Sumber Risiko Produksi Pembenihan Ikan Patin Siam pada Pasir Gaok Fish Farm di Kabupaten Bogor
Abstrak: Siam’s catfish is potential commodity which can develop in Indonesia. This commodity has been developed by Pasir Gaok Fish Farm (PGFF). PGFF faces the production risk as indicated by the production fluctuation and enhancement of catfish seed mortality. The purpose of this study are to identify the sources of production risk, analyze the probability, impact of risks, and alternative strategies. The data was analyzed with descriptive analysis, z-score analysis, and analysis of Value at Risk (VaR). The results showed that prodution risks of siam’s catfish in PGFF are cannibalism, diseases, water quality, and human error. Probability value of each highest risk source consist of cannibalism, diseases, water quality, and human error. The impact of the each highest production risk arerisk of disease, cannibalism, water quality, and human error. Based on the probability and impact of risk, prevention strategies needed to be implemented to solve the risk of cannibalism and disease with giving fresh natural food according to the needs of fish and right time.
Keyword: Bogor Agricultural University (IPB), z-score, value at risk, siam catfish, production risk, pasirgaok

Judul: Analisis Risiko Produksi Benih Ikan Patin Siam (Pangasius hyphotalamus) pada Faholo Farm Kecamatan Ciseeng, Kabupaten Bogor.
Abstrak: Komoditas ikan patin siam dikembangkan dalam bentuk usaha pembenihan oleh Faholo Farm. Faholo Farm dalam kegiatannya menghadapi risiko produksi yang ditunjukkan dengan adanya fluktuasi mortalitas rate (MR). Usaha pembenihan Faholo Farm ditemukan risiko karena mengingat benih ikan patin siam yang dipelihara masih dalam keadaan yang kecil, serta masih rentan kematian. Tujuan penelitian ini adalah mengidentifikasi sumber-sumber risiko produksi, menganalisis probabilitas dan dampak risiko, dan alternatif strategi penanganan risiko. Data yang diperoleh dianalisis menggunakan analisis deskriptif, analisis z-score, dan analisis Value at Risk (VaR). Hasil penelitian menunjukkan bahwa risiko produksi pembenihan ikan patin siam di Faholo Farm adalah faktor musim, kanibalisme, kualitas air, perubahan suhu air, penyakit, kerusakan peralatan teknis, dan keterampilan tenaga kerja. Nilai probabilitas, dampak risiko, dan status risiko dari sumber risiko produksi pada Faholo Farm diperoleh nilai yang tertinggi dan menjadi prioritas utama adalah kanibalisme. Usulan alternatif strategi yang dibuat pada penelitian ini diharapkan dapat membantu masalah risiko produksi yang dihadapi oleh Faholo Farm.
Keyword: pembenihan patin siam, faholo farm, 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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