Judul: Tuna Fisheries Production and Fishers' Welfare at Binuangeun Fish Landing Base (PPI) Banten
Abstrak: Produksi perikanan tuna dan kesejahteraan nelayan di Pangkalan Pendaratan Ikan (PPI) Binuangeun penting untuk diketahui sebagai dasar penentuan kebijakan peningkatan kesejahteraan nelayan dengan tetap memperhatikan kelestarian sumberdaya tuna. Penelitian ini bertujuan menganalisis produksi dan produktivitas perikanan tuna, status pemanfaatan sumberdaya tuna, dan kesejahteraan nelayan tuna di PPI Binuangeun. Pengumpulan data primer dilakukan melalui wawancara pengisian kuisioner dan pengamatan lapangan. Analisis data berupa analisis produksi, produktivitas, potensi lestari maksimum, status pemanfaatan, sistem bagi hasil, dan kesejahteraan nelayan. Produksi dan produktivitas perikanan tuna mengalami peningkatan secara kontinu. Status pemanfaatan sumberdaya tuna tergolong fully-exploited pada tahun 2018 hingga 2020 dan over-exploited pada tahun 2021 karena melebihi potensi lestari maksimum sebesar 210 ton/tahun. Tingkat kesejahteraan nelayan perikanan tuna tergolong tinggi untuk seluruh nakhoda, sedangkan untuk ABK sebanyak 87% tergolong kesejahteraan tinggi dan 13% ABK lainnya tergolong kesejahteraan sedang., Tuna fisheries production and fishers welfare at Binuangeun Fish Landing Base (PPI) are important to know as a basis for policy making to enhancing the welfare of tuna fishers while also ensuring the sustainability of tuna resources. This study aims to analyze the production and productivity of tuna fisheries, the status of tuna resource utilization, and the welfare of tuna fishers at PPI Binuangeun. Primary data was collected through interviews, questionnaires and field observations. Data analysis in the form of production analysis, productivity, maximum sustainable potential, utilization status, profit sharing system, and fishers welfare. The production and productivity of tuna fisheries have increased continuously. The status of tuna resource utilization is classified as fully-exploited in 2018 to 2020 and over-exploited in 2021 because it exceeds the maximum sustainable yield of 210 tons/year. The welfare level of tuna fishers is classified as high for all captains, while for crew members, 87% are classified as high welfare and 13% of other crew members are classified as medium welfare.
Keyword: fisheries production, fishers welfare, maximum sustainable yield, tuna

Judul: The Impact of Catch Production Costs on Fishermen's Welfare and Fisheries Management in Pandeglang Waters
Abstrak: Sumberdaya perikanan di Desa Teluk Pandeglang Banten menjadi kunci produksi pangan dan pendapatan utama bagi masyarakat pesisir Indonesia. Meskipun mayoritas penduduk di daerah ini adalah nelayan, Tingkat kesejahteraan mereka cenderung rendah dibandingkan dengan masyarakat darat. Penelitian ini, dilakukan di PPP Labuan Pandeglang bulan Juni-November 2022, bertujuan menganalisis biaya produksi tangkapan berdsarkan musim dan dampaknya terhadap kesejahteraan nelayan. Hasil penelitian menunjukan bahwa biaya produksi yang terdiri dari biaya tetap, biaya tidak tetap, dan penyustan mempengaruhi pendapatan nelayan. Faktor lain yang mempengaruhi penapatan meliputi musim penangkapan, alat tangkap, harga ikan dan ketersedian. Analisis menunjukan bahwa Tingkat kesejahteraan nelayan diukur berdasarkan pendapatan dan pengeluaran bulanan berkolerasi positif dengan pendapatan mereka. Oleh karena itu, nelayan Pandeglang dapat dikategorikan memiliki tingkat kesejahteraan tinggi jika dibandingkan dengan Upah Minimum Regional (UMR) setempat., Fisheries resources in Teluk Pandeglang Village, Banten, are the key to food production and main income for Indonesian coastal communities. Even though the majority of residents in this area are fishermen, their level of welfare tends to be low compared to land-based communities. This research, conducted at PPP Labuan Pandeglang in June-November 2022, aims to analyze catch production costs based on season and its impact on fishermen's welfare. The research results show that production costs consisting of fixed costs, variable costs and depreciation affect fishermen's income. Other factors that influence fishing include fishing season, fishing gear, fish prices and availability. The analysis shows that the welfare level of fishermen measured based on monthly income and expenditure is positively correlated with their income. Therefore, Pandeglang fishermen can be categorized as having a high level of welfare when compared to the local Regional Minimum Wage (UMR).
Keyword: cost, fishermen, seasons, production, Pandeglang, well-being

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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