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: Pengembangan Perikanan Tangkap Berbasis Optimasi Sumberdaya Ikan Pelagis di Kabupaten Banyuasin Propinsi Sumatera Selatan
Abstrak: The pelagic fish is one of potential fishery resources in Banyuasin District. The production of pelagic fish fishery landed in Banyuasin District was 29,6 ton in year 2006. The objectives of the research were 1) to determine fishing technology for pelagic fish which more effective, efficient and sustainable based on biological, technical, social, economic and environment aspect; 2) to allocate optimum of pelagic fish catching unit in Banyuasin District; and 3) to determine development strategy of pelagic fisheries. The result of this research indicated that drift longline fishing technology is more effective, efficient and sustainable than drift gillnet and liftnet. The number of optimum allocation of fishing unit has been calculated which consist of drift longline 51 unit, drift gillnet 45 unit and liftnet with 55 unit. The output of feasibility analysis of drift longline fishery is the study area, indicated profit of Rp. 18,767,666, its NPV value was Rp. 55,855,075, Net B/C was 2.22, the BEP value was Rp. 39,055,258 that equal to production 23,669 kg, the ROI and IRR value were 41 % and 48. The output of feasibility analysis of drift gillnet fishery is the study area, indicated profit of Rp. 17,320,000, its NPV value was Rp. 46,437,216, Net B/C was 2.08, the BEP value was Rp. 26,951,872 that equal to production 16,171 kg, the ROI and IRR value were 40 % and 48 %. The output of feasibility analysis of liftnet fishery is the study area, indicated profit of Rp. 23,610,000, its NPV value was Rp. 214,477,312, Net B/C was 3.94, the BEP value was Rp. 31,292,924 that equal to production 16,506 kg, the ROI and IRR value were 32 % and 83 %. The development strategy of pelagic fisheries in Banyuasin District are: (1) optimization pelagic fish fishery with drift longline; (2) development pelagic fish fishery focusing in 6-12 mile zone; (3) Increase management effort of fisheries business; (4) revitalization of fisheries infrastructure and facility; and (5) Empowering scale of fishing fleet and its technology.
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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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