Judul: Analisis Daya Saing Usaha Peternakan Sapi Potong dan Usaha Budidaya Ikan Patin di Kabupaten Indragiri Hulu Provinsi Riau
Abstrak: Indonesia still imports 30 percent of beef to meet domestic demand, while still importing catfish fillets from Vietnam amounted to 600 tons per month in 2011. Indragiri Hulu district of Riau province is one of the central areas of beef cattle and catfish business. There are several problem about beef cattle and catfish business in the region. Therefore it is necessary to study on competitiveness of both types of business. This study aims to analyze: (1) competitiveness beef cattle and catfish business in the District of Indragiri Hulu, (2) the impact of government’s input-output policy on the competitiveness of beef cattle and catfish business. Policy Analysis Matrix (PAM) was employed in this study in order to measure level of competitive and comparative advantage and effect of government interventions on beef cattle and catfish business. The results showed that Beef cattle business is profitable and has competitive and comparative advantage. Catfish aquaculture that uses most of the feed from factories are uncompetitive, while the catfish aquaculture that use alternative feed has highly competitiveness. The impact of government policy on output of beef cattle and catfish business indicates positive result. It is means that the government intervention has been effective so the prices received by farmers is higher than international prices.
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Judul: Analysis of Catfish (Pangasius sp.) Farming Agribusiness System in Koto Mesjid Village Kampar Riau Regency
Abstrak: Ikan patin merupakan komoditas unggulan Indonesia dengan prospek bisnis yang berorientasi ekspor. Salah satu wilayah yang mengembangkan budidaya ikan patin di Pulau Sumatera adalah Desa Koto Mesjid Kecamatan XIII Koto Kampar yang merupakan kawasan minapolitan dengan produktivitas panen mencapai 40-50 ton/hari. Tujuan penelitian ini adalah menganalisis kegiatan budidaya ikan patin di Desa Koto Mesjid sebagai subsistem on farm terkait dengan subsistem hulu, subsistem hilir, dan subsistem pendukung. Penelitian ini menggunakan metode studi kasus melalui observasi langsung dan wawancara kepada pembudidaya, UMKM olahan patin, dan pedagang pemasar. Hasil menunjukan bahwa bisnis budidaya ikan patin di Desa Koto Mesjid terdiri dari dua tipe, yaitu produksi untuk ikan salai dengan ratio R/C 1,12 dan produksi untuk ikan konsumsi dengan ratio R/C 1,18. Bisnis ikan patin ini didukung oleh balai pembenihan, pakan mandiri, UMKM pengolahan, dan saluran pemasaran yang terus berkembang dan bertambah jumlahnya serta jasa layanan pendukung yang cukup lengkap tersedia. Peningkatan produksi ikan patin sejalan dengan peningkatan pakan mandiri (R2 = 0,72) dan penambahan jumlah RTP budidaya (R2 = 0,74). Hubungan antara subsistem hulu dan hilir dengan subsistem budidaya mampu meningkatkan volume produksi budidaya di kawasan tersebut., Catfish is Indonesia's leading commodity with export-oriented business prospects. One of the areas that develops catfish farming on the island of Sumatra is Koto Mesjid Village, XIII Koto Kampar District, which is a minapolitan area with harvest productivity reaching 40-50 tons / day. The purpose of this study was to analyze catfish farming activities in Koto Mesjid Village as an on-farm subsystem related to the upstream subsystem, downstream subsystem, and supporting subsystems. This research uses a case study method through direct observation and interviews with cultivators, MSME processed catfish, and marketers. The results showed that the catfish farming business in Koto Mesjid village consisted of two types, namely production for smoked fish with an ratio R/C of 1,12 and production for consumption fish with an ratio R/C of 1,18. The catfish business is supported by hatcheries, independent feed, processing MSMEs, and marketing channels that continue to grow and increase in number as well as fairly complete support services available. The increase in catfish production was in line with the increase in independent feed (R2 = 0,72) and the increase in the number of cultivated FHs (R2 = 0,74). The relationship between the upstream and downstream subsystems with the cultivation subsystem is able to increase the volume of cultivation production in the area.
Keyword: Business, catfish, Koto Mesjid Village, production

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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