Judul: Usaha Penangkapan Purse Seine dan Peluang Pengembangannya di Pelabuhan Perikanan Nusantara Prigi
Abstrak: Usaha penangkapan purse seine yang berbasis di Pelabuhan Perikanan Nusantara (PPN) Prigi memiliki peluang yang besar untuk dikembangkan karena jumlah hasil tangkapan yang banyak dan berpotensi untuk dikembangkan, diantaranya, sebagai bahan baku untuk industri pengolahan ikan. Hasil tangkapan dari unit penangkapan purse seine mendominasi jumlah hasil tangkapan di PPN Prigi. Penelitian ini bertujuan untuk menghitung kelayakan usaha dan menyusun strategi untuk pengembangan purse seine di PPN Prigi. Metode yang digunakan dalam penelitian yaitu studi kasus dengan analisis kuantitatif untuk menghitung keuntungan usaha dan menyusun strategi dengan analisis SWOT. Hasil analisis menunjukkan keuntungan usaha purse seine di PPN Prigi per tahun sebesar Rp675.005.574, artinya usaha menguntungkan. Strategi pengembangan usaha purse seine yang perlu dilakukan di PPN Prigi yaitu pihak pengelola PPN Prigi bersama nelayan berupaya meningkatkan hasil tangkapan dan memanfaatkan sumber daya ikan di perairan Prigi. Selain itu, pihak pengelola pelabuhan perlu melakukan upaya ekspor hasil tangkapan purse seine untuk meningkatkan kesejahteraan masyarakat sekitar PPN Prigi., Purse seine catching business based in Nusantara Fishing Port (NFP) Prigi has a high opportunity to be developed because of the large number of catches and the potential to be developed into a fish processing industry. Catches from purse seine capture units dominate the number of catches at the port. This research aims to calculate the feasibility of the business and develop a strategy for the development of purse seine in NFP Prigi. The method used in the study was a case study with quantitative analysis to calculated business profits and strategize with SWOT analysis. The analysis results showed the profit of purse seine business in Prigi fishing port per year amounted to Rp675,005,574, meaning profitable business. The purse seine business development strategy that needs to be done in NFP Prigi is the management of NFP Prigi and fishers to improve the catch and utilize fish resources in prigi waters. In addition, the port management needs to make efforts to export the catch of purse seine to improve the community's welfare around NFP Prigi.
Keyword: profit, purse seine, development, NFP Prigi, strategy

Judul: Pengembangan Perikanan Purse Seine Di PPI Blanakan Subang
Abstrak: In a way to discover how to develop a sustainable fishing industry, it’s necessary to studying it through multiple aspects such as biological, engginering, social and economic. Purpose of this research is to doing a feasibility study of purse seine fishery business and also describe the performance of purse seine fishery in PPI Blanakan Subang, West Java. Blanakan village have a fairly fisheries economic activity, marked by busy fisheries auction. The common fishing gear in PPI Blanakan Subang is purse seine. The method used in this research is descriptive method with case study type, while respondents sampling method used was purposive sampling. The purse seine vessels used as sample in research have dimension with provison, length: 15-20 m, width: 5-6 m, dept: 2-3 m draft: 0,75-1,5 m. Fish agregating device is also used in purse seine operation, while fishing base location is in Java Sea, 60-100 miles from shorline with a depth over 40 meters. Composition of purse seine catches are dominated by small pelagic fish include: Fish Seads (Decapterus spp.), Black Pomfret (Formio niger), Indo-pacific Mackerels (Rastrelliger spp.), Trevally (Selaroides spp.), Fringescalles Sardinella (Sardinella fimbriata), Eastern Title Tuna (Euthynnus spp.) and Squid (Loligo spp.). The requirements investment costs to start is Rp 398.350.000,00. Fixed costs that must be paid every year is Rp 124.795.000,00. Variable costs bear by owner each year is Rp 394.380.000,00. Total Revenue (TR) acquired during the year amounted to Rp 1.149.478.923,18 and the Total Cost (TC) issued during the year amounted to Rp 925.461.434,67 so Profits (π) obtained by owner for one year of Rp 224.017.448,51. Based on calculations from the analysis effort and investment has been made then this bussines is still profitable and feasible to be developed, so that may be a consideration if some entrepreneurs interested in starting businesses purse seine fishery.
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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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