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: Analysis of Squid Fishing Seasons and Bouke Ami Production Factors in Fisheries Port of Nusantara Kejawanan
Abstrak: Cumi-cumi yang ditangkap oleh armada bouke ami merupakan salah satu hasil tangkapan yang potensial di PPN Kejawanan. Musim penangkapan cumi dibagi menjadi kategori paceklik, sedang, dan puncak berdasarkan hasil tangkapan yang didapatkan. Hasil tangkapan cumi-cumi dapat dipengaruhi oleh berbagai faktor, seperti tenaga kerja, lama waktu trip, perbekalan dan lainnya. Tujuan penelitian ini menganalisis pola musim penangkapan cumi-cumi dan faktor produksi kegiatan operasi penangkapan cumi-cumi yang dilakukan oleh armada bouke ami di PPN Kejawanan. Metode penelitian yang digunakan adalah menggunakan analisis catch per unit effort (CPUE), analisis deret waktu metode rata-rata bergerak, analisis indeks musim penangkapan, dan analisis dekriptif faktor produksi dari data time series laporan tahunan pelabuhan. Berdasarkan nilai indeks musim penangkapan (IMP) yang diperoleh, diduga musim sedang terjadi pada bulan Februari, Maret, April, Mei, Juli, dan Desember. Sedangkan musim puncak terjadi pada bulan Januari, Juni, Agustus, September, Oktober, dan November. Hasil penelitian menunjukkan terdapat beberapa faktor produksi yang digunakan pada kegiatan operasi penangkapan cumi-cumi armada bouke ami di PPN Kejawanan, di antaranya adalah ABK, lama waktu trip, perbekalan air, dan perbekalan BBM. Jumlah penggunaan faktor produksi tersebut cenderung menyesuaikan dengan ukuran dan kapasitas kapal penangkap ikan., Squid from bouke ami is one of the potential catches in PPN Kejawanan. The fishing season is divided into bad, intermediate, and peak categories based on the catch. Several variables might affect squid catches, including manpower, trip duration, supplies, and others. This study aimed to analyze the squid fishing season pattern and the production factors for squid fishing operations in PPN Kejawanan. The research methods applied include the catch per unit effort analysis, time series analysis utilizing the moving average approach, fishing season index analysis, and descriptive analysis factors of production from the port annual report time series data. In the fishing season acquired, it is assumed that the intermediate season runs from February, March, April, Mei, July, and December. While January, June, August, September, October, and November will be the peak seasons. Results of the study showed that there were several production factors used in the squid fishing operation of bouke ami fleet at PPN Kejawanan, including crew members, length of trip, water supplies, and fuel supplies. Amount of use of these production factors tends to adjust to size and capacity of the fishing vessel.
Keyword: bouke ami, squid, PPN Kejawanan, fishing season, production factors

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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