Judul: Optimisasi Pengembangan Perikanan Purse Seine di PPN Pemangkat Kabupaten Sambas Propinsi Kalimantan Bmt
Abstrak: Fishing Port of Pemangkat is the largest fishing port in Kalirnantan Barat Province and facing directly to South China Sea. South China Sea has the big potency of big pelagic fish amount to 66.080 tondyear and small pelagic fish amount to 621.500 ton /year, but level of exploitation is low, i.e. 53,21% for big pelagic fish and 33,07% for small pelagic fish. Pelagic fish in PPN Pemangkat is only caught by purse seiners. The aims of this research are to determine the optimum exploitation level of fish in fishing ground of PPN Pemangkat purse seiners, to determine effort feasibility level and to create the optimum alternative solution to develop purse seine fisheries in PPN Pemangkat. Data collecting was done with field observation method by fishing log book and interview to fishing master. Biological analysis was conducted by using surplus production approach, effort feasibility analysis was conducted by calculated value of NPV, IRR, net BIC, profitability ratio, payback period and sensitivity analysis, while optimization d y s i s used linear goal programming. In fishing ground of purse seine fishermen of PPN Pemangkat, effort of ikan tomgkol, luyang, selur and tenmiri are still potential to be developed, but ikan kmbung and tembang wae over fishing. Economic analysis indicated that all kind of purse seiners in PPN Pemangkat are feasible for further development. Optimization analysis by linear goal programming recommended that 22 unit fishing bat of 30-59 GT available to exploit the fisheries potency, while fishing boat of 60-89 GT and 2 90 GT weren't recommended with consideration sustainability of resources. Taritorial water of South China Sea is still having great pelagic fish potency, while local fishing ground had been over fished by the fishermen of PPN Pemangkat. Considering to these evident, the expansion of fishing ground to South China Sea are recommended, achieving by increasing the number of fishing boat i.e. 521 unit of 30-59 GT, 484 unit of 60-89 GT and 1779 unit of 2 90 GT, because the fishing boat of 2 90 GT able to operate until the Indonesian ZEE hurl*.
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Judul: Kajian Ekonomi Sumberdaya Perikanan di Perairan Pemangkat Kabupaten Sambas
Abstrak: Penelitian ini bertujuan mengkaji alokasi optimum ikan laut yang didaratkan di Pelabuhan Perikanan Nusantara (PPN) Pemangkat dengan menggunakan Model Bio-economic. Nilai optimum yang dihitung adalah tingkat produksi, jumlah effort dan nilai manfaat sumberdaya. Nilai ini kemudian dialokasikan menjadi tangkapan optimum per effort, jumlah alat tangkap, jumlah nelayan dan nilai manfaat optimal. Hasil perhitungan alokasi optimum sumberdaya ikan di Perairan Pemangkat ini menghasilkan banyaknya tangkapan optimal (quota) per trip yang dapat ditangkap oleh nelayan di perairan Pemangkat. Tangkapan optimal per trip setingkat gill net untuk menangkap ikan demersal pada discount rate 2,89 % adalah sebanyak 15,70 kilogram, tangkapan optimal per trip setingkat purse seine untuk menangkap pelagis besar adalah sebanyak 42,97 kilogram dan pelagis kecil sebanyak 1.435 kilogram. Untuk tangkapan optimal per trip setingkat lampara Dasar untuk menangkap udang dan molusca berturut-turut adalah sebanyak 16,71 kilogram dan 16,71 kilogram. Jumlah alat tangka optimal berdasarkan analisis dinamik adalah sebanyak 10 unit alat setingkat gill net untuk menangkap ikan demersal, 6 unit alat setingkat purse seine untuk menangkap ikan pelagis besar dan pelagis kecil serta 0 unit alat setingkat lampara dasar untuk menangkap udang dan molusca. Konsekuensinya diharapkan jumlah nelayan gill net optimal adalah sebanyak 51 orang, nelayan purse seine 187 orang dan nelayan lampara dasar sebanyak 0 orang.
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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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