Judul: Teknologi Penangkapan Pilihan untuk Perikanan Rajungan di Perairan Gebang Mekar Kabupaten Cirebon
Abstrak: The commence of swimming crab on market export tend to increase the price, that cause becomes one of the motivator of Gebang Mekar fishermen participating on swimming crab fishery. Since 2001 swimming crab fishing technology become changed from set bottom gillnet to trap at Gebang Mekar waters. The objectives of this research are: to determine swimming crab fishing technology alternative which more effective, efficient and suistainable and then to determine development strategy of swimming crab fishery. Some analysis used in this research were (1) Scoring method, to determine the best of swimming crab fishing technology pursuant to biological, technical, social and economic aspects; (2) Feasibility analysis, to determine the suitable swimming crab fishing technology; (3) SWOT analysis, to determine development strategy of swimming crab fishery. The result of this research is the swimming crab trap fishing technology which effective, efficient and suistainable. The development strategy of swimming crab fishing with trap at Gebang Mekar waters are: (1)Optimizing swimming crab fishery with trap; (2)Development swimming crab fishery in line 2; (3)Increase the effort management of fisherman; (4)Developing of fishing vessel; (5)Repairing infrastructure facilities fisheries.
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Judul: Keragaan Modifikasi Perangkap Lipat Kepiting di Desa Mayangan dan Legonwetan, Subang, Jawa Barat
Abstrak: Mud crab captured by various fishing gears. Trap produces best quality catches, because of the catch remain alive. Research has been conducted in Legonwetan and Mayangan waters since April to May 2012, aiming to get productivity and selectivity crab of collapsible traps. Laboratory-scale research was conducted to gain corresponding trajectory entrance angle, materials, and determining escape gaps size. Modified gear is 70 cm x 50 cm x 35 cm (L x W x H), with ramp tilt angle 30° and 40° with escape gap sizes 4 cm x 6 cm and 5 cm x 7 cm. Furthermore, fishing trials were conducted to see catches composition. ANOVA and t test were used to determine difference between tested folding traps. The result shows that there are significant influence in the doorway tilt angle differences to the amount of crab catches (F = 5.458, P = 0.023 <α = 0.05). Doorway tilt angle of 30 ° produce more catch than 40 ° angle ((t hit = 4.407, P <0.05). In conclusion, crab folding trap with trajectory doorway tilt angle of 30° is more productive to catch crabs and escape gap of 4 cm x 6 cm effective to release juvenile crabs.
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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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