Judul: Analisis Efisiensi Faktor yang Mempengaruhi Produksi Ikan Koi di Kecamatan Cisaat Kabupaten Sukabumi
Abstrak: Koi fish (Cyprinus carpio) is a leading commodity of freshwater fish that attracted many people. Koi fish is not only kept by hobiis but also it’s interested and profitable commodity. Cisaat is one of producer of Koi fish that located in Northern Sukabumi, West Java, Indonesia. The turnover of Koi fish business in Cisaat can reach IDR 20 million per month. However, productions are still fluctuative and high quality products are still difficult to achieved, so the research study about the factors that influence Koi fish’s production is necessary to do. The purposes of this study are (1) to identify the factors that influence Koi fish’s production in Cisaat; (2) to analyze the efficiency level of the use of production factors of Koi fish in Cisaat; and (3) to identify consumer’s transaction motive to purchase koi fish in Cisaat. The production function model is analyzed by using multiple linear regeression analysis, production efficiency analysis are technically and economically, and consumer’s transaction motive to purchase Koi fish is analyzed by using descriptive analysis. The result of the research study showed that seed, manure, and medicines significantly affected Koi fish’s production. The use of these production factors has been achieved the efficiency technically but not economically yet. The main transaction motive to purchase Koi fish is because of its beauty on it’s body shape and colors with purchasing purpose is hobby.
Keyword: Bogor Agricultural University (IPB), transaction motive, production, multiple linear regression analysis, Koi fish, efficiency

Judul: Analisis Saluran dan Marjin Pemasaran Ikan Koi di Kecamatan Cisaat, Kabupaten Sukabumi
Abstrak: Kecamatan Cisaat memiliki potensi alam cukup baik memproduksi ikan koi. Namun, belum dioptimalkan sehingga produksi grade unggul (A dan B) masih rendah. Perbedaan harga jual sesuai grade menimbulkan dugaan adanya gap antara pembudidaya dan konsumen akhir sehingga perolehan keuntungan dalam sistem pemasaran ikan koi tidak setara. Penelitian ini bertujuan: 1) Menganalisis lembaga, fungsi dan saluran pemasaran yang terjadi dalam sistem pemasaran ikan koi dan mengestimasi nilai marjin pemasaran, farmer’s share dan net B/C, 2) Mengkaji efisiensi pemasaran. Analisis kualitatif untuk mengetahui fungsi dan sistem pemasaran ikan koi, kuantitatif untuk menghitung marjin pemasaran, farmer’s share dan net B/C. Hasil menunjukkan, empat lembaga pemasaran terlibat, setiap lembaga melakukan ketiga fungsi pemasaran dengan aktivitas berbeda-beda serta terdapat enam saluran pemasaran. Marjin pemasaran terbesar grade A dan B pada saluran V, farmer’s share terbesar diperoleh saluran VI, nilai net B/C terbesar pada saluran V. Saluran pemasaran paling efisien adalah saluran VI karena memenuhi seluruh indikator efisiensi pemasaran.
Keyword: farmer’s share, ikan koi, Kecamatan Cisaat, marjin pemasaran, saluran pemasaran.

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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