Judul: Income Analysis and Development Strategy of Vaname Shrimp Aquaculture (Case Study: Patutrejo Village, Purworejo Regency)
Abstrak: Desa Patutrejo merupakan salah satu desa di Kabupaten Purworejo yang berbatasan langsung dengan Samudra Hindia di bagian selatan sehingga mendukung kegiatan budidaya perikanan salah satunya adalah budidaya tambak udang vaname. Namun pada empat tahun terakhir, petambak mulai menghadapi kendala tingginya intensitas kegagalan panen akibat penyakit yang menyerang udang yang menyebabkan penerimaan menurun sehingga banyak petambak memilih untuk berhenti melakukan budidaya. Berdasarkan hal tersebut tujuan dari penelitian ini yaitu (1) menganalisis pendapatan budidaya udang vaname, (2) menganalisis faktor-faktor yang memengaruhi keputusan petambak untuk melanjutkan budidaya, (3) menyusun strategi pengembangan budidaya. Hasil pada analisis pendapatan didapatkan bahwa R/C rasio bernilai lebih dari satu sehingga budidaya udang vaname di Desa Patutrejo masih menguntungkan. Pada analisis faktor-faktor yang yang memengaruhi keputusan berbudidaya menggunakan analisis regresi logistik biner, faktor yang mempengaruhi adalah luas lahan dan pendapatan petambak. Pada penyusunan strategi pengembangan budidaya menggunakan Analytical Hierarchy Process (AHP), kriteria yang harus dipenuhi terlebih dahulu adalah manajemen penyakit udang. Salah satu alternatif kegiatan yang dapat dilakukan adalah pengadaan pelatihan cara berbudidaya ikan yang baik kepada petambak serta penyebaran informasi mengenai penanganan penyakit udang agar menekan angka gagal panen., Patutrejo Village is one of the villages in Purworejo Regency which is directly located on the southern edge of the Indian Ocean, which supports aquaculture activities, one of which is vaname shrimp aquaculture. However, in the last four years, farmers began to face the constraints of the high intensity of crop losses due to diseases that attack shrimp causing revenue to decline so many farmers choose to stop cultivating. Based on this, the objectives of this study are (1) to analyze the income of vaname shrimp aquaculture, (2) to analyze the factors that influence the decision of farmers to continue cultivation, (3) to develop a strategy for aquaculture development. The results of the income analysis found that the R/C ratio is more than one so vaname shrimp aquaculture in Patutrejo Village is still profitable. The influential factors influencing farming decisions using binary logistic regression analysis are land area and farmer income. In preparing aquaculture development strategies using the Analytical Hierarchy Process (AHP), the criteria that must be met first is shrimp disease management. One of the alternative activities that can be carried out is through the provision of training on how to cultivate good fish for farmers and the dissemination of information on shrimp disease management to reduce the number of crop losses.
Keyword: Analytic Hierarchy Process, R/C rasio, faktor keputusan budidaya, manajemen penyakit

Judul: Analisis Faktor-Faktor yang Mempengaruhi Produksi dan Pendapatan Budidaya Tambak Udang Vaname di Kecamatan Pasekan Kabupaten Indramayu
Abstrak: Vannamei Shrimp (Litopeanus vannamei) is one of shrimp variety that cultivated in Indonesia. Shrimp is the main export commodity of fishery production in Indonesia. In this country, Vannamei Shrimp is cultivated intensively and traditionally. One of productive regional that yields Vannamei Shrimp is in Indramayu Regency. In one of Subdistrict of Indramayu, Pasekan, Vannamei Shrimp are most traditionally cultivated. The aims of this research are the production factors that have influences toward Vannamei Shrimp fishpond’s production and to analyze the ratio of Vannamei Shrimp fishpond’s income based on the capital finance sources, theyare personal capital finance and capital finance that debt from middleman. Based on the double linier regretion estimate, the factor that influence Vannamei Shrimp fishpond’s production are feed (kilograms), fuel (liter), and the period of cultivation (days). According to the income analysis, in found that the value of R/C ratio > 1 for all cultivations, either of cultivation by personal capital finance or cultivation by personal capital finance or cultivation whit financial source by lending from middleman. The R/C ratio value of farmers who cultivate shrimp by their one capital finance are smaller than farmers who get their capital finance fram middleman. It means that farmwe who use financial from middleman are more afficient. Based on the results of research, to increase production Vannamei Shrimp, increase the use of feed vaname, solar and duration of maintenance Vannamei Shrimp. In accordance with the Department of Fisheries and Marine programs Indramayu Regency regarding counseling, guidance regarding the use of the addition of feed, fuel, and period of cultivation in Vannamei Shrimp can be intensively. Cooperation between the Department of Fisheries and Marine programs Indramayu District to middleman in terms of the use of production inputs can be done to increase the production level Vannamei Shrimp cultivators.
Keyword: Vannamei Shrim, traditionally fishpond, production factor, income analysis

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.
Keyword: