Judul: Squid Fisheries Business Activities During the Covid-19 Pandemic at Nizam Zachman Ocean Fishing Port, Jakarta
Abstrak: Cumi-cumi merupakan komoditas tangkapan yang memiliki nilai ekonomis tinggi dan dapat ditemukan di berbagai perairan Indonesia. Bouke ami merupakan armada yang mendaratkan cumi-cumi sebagai hasil tangkapan utama. Penurunan produksi ikan selama pandemi diduga akibat adanya pembatasan aktivitas distribusi dan pemasaran ekspor komoditas perikanan dan berimbas terhadap penurunan harga ikan hasil tangkapan secara umum. Penelitian ini bertujuan menganalisis produktivitas armada bouke ami selama pandemi, mengidentifikasi tren harga komoditas cumi-cumi dan pendapatan armada bouke ami, dan merumuskan strategi usaha perikanan bouke ami selama era pandemi. Penelitian ini menggunakan metode survei dengan penggunaan data primer dan data sekunder. Rata-rata produksi terendah selama pandemi adalah 4.496 kg pada bulan April dan tertinggi 6.618 kg pada bulan November. Sebelum pandemi, ratarata produksi terendah adalah 2.419 kg pada bulan November dan tertinggi 8.311 kg pada bulan September. Harga rata-rata cumi terendah sebelum pandemi adalah Rp65.000,00 dan tertinggi Rp78.409,00 sedangkan selama pandemi adalah Rp65.333,00 dan tertinggi Rp77.500,00. Pendapatan armada bouke ami tahun 2019 sebesar 719,7 juta rupiah dengan keuntungan 277 juta rupiah sementara tahun 2020 sebesar satu miliar rupiah dengan keuntungan 396,6 juta rupiah. Strategi yang diperlukan untuk meningkatkan usaha perikanan cumi adalah optimalisasi penangkapan, pengaturan dan efisiensi waktu operasi penangkapan serta perluasan jangkauan pasar., Squid is a catch commodity with high economic value and can be found in various Indonesian waters. Bouke ami is a fleet that lands squid as the main catch. The decline in fish production during the pandemic is suspected to be due to restrictions on distribution and marketing activities for exports of fishery commodities. It impacts the decline in the price of caught fish in general. This study aims to analyze the productivity of the bouke ami fleet during the pandemic, identify trends in squid commodity prices and bouke ami fleet revenues, and formulate a bouke ami fishery business strategy during the pandemic era. This study used a survey method with the use of primary data and secondary data. Rata-rata produksi terendah selama pandemi adalah 4.496 kg pada bulan April dan tertinggi 6.618 kg pada bulan November. Before the pandemic, the lowest average production was 2,419 kg in November, and the highest was 8,311 kg in September. The lowest average price of squid before the pandemic was IDR 65,000.00, and the highest was IDR 78,409.00, while during the pandemic, it was IDR 65,333.00, and the highest was IDR 77,500.00. The revenue of the bouke ami fleet in 2019 was 719.7 million rupiahs with a profit of 277 million rupiahs, while in 2020, it was one billion rupiahs with a profit of 396.6 million rupiahs. The strategies needed to improve the squid fisheries business are optimizing fishing, regulating fishing operations' regulation and efficiency, and expanding market reach.
Keyword: bouke ami, Covid-19 pandemic, Nizam Zachman ocean fishing port, squid fishery

Judul: Analisis Produksi Cumi-cumi Unit Penangkapan Bouke Ami di PPS Nizam Zachman Jakarta
Abstrak: Penelitian ini bertujuan untuk menganalisis teknis alat tangkap, produktivitas dan faktor produksi cumi-cumi dari unit penangkapan bouke ami di PPS Nizam Zachman Jakarta. Analisis data yang dilakukan meliputi analisis teknis, analisis produktivitas serta faktor yang mempengaruhi produksi menggunakan analisis OLS. Alat tangkap jaring bouke ami seluruhnya adalah PE (Polyethylene) dengan bukaan mulut jaring mencapai 15 meter dan panjang jaring mencapai 14 meter. Jaring menggunakan tiang gawang dengan bahan bambu sepanjang 17 meter. Fishing ground unit penangkapan bouke ami terletak di perairan pulau Bangka hingga Selat Karimata. Penurunan produktivitas terbesar pada tahun 2013 terjadi pada nelayan. Produktivitas nelayan menurun jauh lebih dari 19% pada tahun 2013 sementara jumlah nelayan mengalami kenaikan mencapai 42,05% pada tahun 2013. Hasil analisis OLS menunjukkan aktivitas trip, jumlah kapal dan musim mempengaruhi produksi cumi-cumi secara positif, sedangkan nilai negatif terlihat pada nelayan yang artinya semakin banyak nelayan pada unit penangkapan maka produksi cumi-cumi akan semakin tidak efisien., This study aims to analyze the technical of catching gear, productivity and factors of squid production by the bouke ami fishing unit in Nizam Zachman Jakarta Ocean Fishing Port. Data analysis was conducted on the technical analysis, analysis of productivity and factors affecting the production using OLS analysis. Bouke ami fishing gear nets are all PE (Polyethylene) with net mouth openings up to 15 meters long and 14 meters of net reach. Nets using a frame with a 17-meter bamboo material. Bouke ami fishing unit's fishing ground is located at the waters of the Bangka island up to Karimata strait. Biggest productivity reduction in 2013 occurred on fishermen. Fishing productivity reduce much more than 19% in 2013 while the number of fishermen has increased up to 42.05% in 2013, OLS analysis results showed activity of trip, number of vessels and season are positively affect the squid production, while a visible negative value indicated by fishermen which means the more number of fishermen on the fishing unit then the squid production will be even less efficient.
Keyword: cumi-cumi, bouke ami, teknis alat tangkap, produktivitas, faktor produksi

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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