Judul: The Use of Bait Booster of Bottom Gillnet  in Palabuhanratu
Abstrak: Perkembangan teknologi alat tangkap jaring rampus dan metode operasi penangkapannya tidak banyak mengalami perubahan dan cenderung statis. Selain itu, permasalahan yang dihadapi oleh nelayan rampus di Teluk Palabuhanratu adalah produktivitas hasil tangkapan yang tidak meningkat. Upaya yang dilakukan adalah penggunaan booster umpan sebagai inovasi teknologi alat bantu pemikat. Dengan demikian penelitian penggunaan booster umpan dengan kombinasi tiga jenis umpan diperlukan untuk mendapatkan solusi permasalahan bagi nelayan jaring rampus yang dapat memberikan peluang meningkatkan produktivitas hasil tangkapan sekaligus meningkatkan pendapatannya. Metode yang digunakan yaitu dengan membandingkan jaring rampus piece perlakuan dengan jaring rampus piece kontrol. Penelitian ini dilaksanakan di Laboratorium Teknologi Alat Penangkapan Ikan FPIK IPB dan Perairan Teluk Palabuhanratu dengan metode eksperimental fishing dengan melakukan sebanyak 20 trip sebagai ulangan. Hasil penelitian yang didapatkan menunjukan peningkatan pada piece perlakuan terhadap piece kontrol. Produktivitas jaring rampus perlakuan memiliki nilai yang lebih besar daripada piece kontrol, yaitu sebesar 0,85 kg/piece dan 0,50 kg/piece, kemudian untuk persentase pertambahan produksi jaring rampus piece perlakuan terhadap kontrol sebesar 70,53%. Jaring rampus perlakuan mendapatkan pendapatan bersih sebesar Rp14.446,00/piece sementara untuk piece kontrol sebesar Rp6.287,00., The development of technology for Bottom Gillnet fishing gear and its catching method has not much changed and tends to be static. In addition, the problem faced by gillnet’s fishermen in Palabuhanratu is the productivity of their catches does not increase. The effort made is the use of bait booster as the innovation of luring tool technology. Thus research on the use of bait booster with a combination of three types of bait is needed to find the solution to the problem for gillnet’s fishermen which can provide opportunities to increase catch productivity while increasing their income. The method used was to compare the treatment gillnet piece with the gillnet control piece. This research was carried out at the Fishing Equipment Technology Laboratory of FPIK IPB and Palabuhanratu with an experimental fishing method by conducting 20 trips as repetition. The research results showed an increase in the treatment piece against the control piece. The productivity of treated gillnet has a greater value than the control piece, which is 0.85 kg/piece and 0.50 kg/piece, then the percentage of treated piece productivity is 70.53%. The treated gillnet gets a net income of Rp14,446.00 while the control piece gets Rp6,287,00.
Keyword: booster, jaring rampus, Palabuhanratu, umpan, bottom gillnet, bait

Judul: Utilization of Bait Bag Boosters in Trammel net Fishing Gear  in Palabuhanratu Bay
Abstrak: Hasil tangkapan trammel net di Palabuhanratu cenderung mengalami penurunan. Salah satu alternatif yang dapat digunakan adalah dengan penggunaan umpan yang mengandung asam amino untuk membantu penangkapan sebagai perangsang utama dalam proses penciuman ikan. Namun belum ada informasi mengenai penggunaan umpan pada trammel net. Penelitian ini bertujuan membandingkan komposisi hasil tangkapan, menentukan pengaruh penggunaan umpan dan mengestimasi penerimaan trammel net perlakuan dan kontrol. Penelitian dilakukan di Teluk Palabuhanratu menggunakan metode experimental fishing sebanyak 30 setting. Hasil tangkapan pada piece trammel net perlakuan sebesar 56,49 kg dan piece kontrol sebesar 37,30 kg. Hasil tangkapan dominannya yaitu udang jerbung (Penaeus merguensis), rajungan bintang (Portunus sanguinolentus), dan pepetek (Leiognathus equulus). Produktivitas per-piece perlakuan lebih besar dibandingkan kontrol dengan masing-masing sebesar 0,47 kg/piece dan 0,32 kg/piece. Persentase produksi trammel net piece perlakuan lebih besar dibandingkan piece kontrol dan terjadi peningkatan penerimaan hasil tangkapan jaring trammel net perlakuan terhadap kontrol., Trammel net catches in Palabuhanratu have declined significantly. One alternative that can be used as solution is using bait containing amino acids to help catch the fish by stimulate fish's olfactory sensor. There is still no information regarding the use of bait in trammel nets. This research aims to compare the composition of catches, determine the effect of using bait and estimate the revenue beetween trammel nets experimental and control. The research was conducted in Palabuhanratu Bay using experimental fishing methods with the total 30 settings. The total catch experimental trammel net piece was 56.49 kg and the control piece was 37.30 kg. The dominant catches for experimental nets are jerbung shrimp (Penaeus merguensis), star crab (Portunus sanguinolentus), and pepetek (Leiognathus equulus). The productivity per piece of the experimental net was greater than the control with respective values of 0.47 kg/piece and 0.32 kg/piece. The percentage of production of treated trammel net pieces was greater than that of the control pieces and there was an increase in revenue from the treated trammel net net catches compared to the control.
Keyword: bait bags, Palabuhanratu Bay, squid, trammel net, trash fish

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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