Judul: Financial Feasibility of Mangrove’s Fruit Processing Business
Abstrak: Mangrove merupakan tumbuhan laut tropis yang dapat tumbuh subur di air payau. Mangrove dapat ditanam dan tumbuh alami di wilayah pesisir. Mangrove berfungsi sebagai sarana rehabilitasi wilayah pesisir. Saat ini, buah mangrove mulai diolah menjadi produk olahan untuk tujuan bisnis. Tingginya potensi bisnis pengolahan buah mangrove akan berpengaruh terhadap ketersediaan buah mangrove dan terhadap upaya rehabilitasi. Tujuan dari penelitian ini adalah untuk menganalisis kelayakan finansial usaha pengolahan buah mangrove, menganalisis faktor yang menentukan kelayakan finansial usaha pengolahan buah mangrove, dan menganalisis konsekuensi usaha pengolahan buah mangrove terhadap ketersediaan buah mangrove. Penelitian ini menggunakan metode kelayakan finansial, perhitungan switching value, dan metode aspek teknis. Hasil penelitian menunjukkan bahwa usaha pengolahan buah mangrove layak berdasarkan analisis finansial. Kelayakan ini menunjukkan usaha pengolahan buah mangrove berpotensi tinggi untuk dikembangkan, namun pengembangan usaha pengolahan buah mangrove perlu memerhatikan peraturan yang berlaku. Selain itu, kelayakan tersebut juga sensitif terhadap penurunan harga jual produk.
Keyword: Financial feasibility, Mangrove for business, Mangrove fruit, Rehabilitattion, Technical aspect methods, Grow naturally, Inflow, Outflow

Judul: Analysis of the development of mangrove products as alternative livelihoods of coastal communities (Case Study of Pantai Bahagia Village, Muara Gembong District, Bekasi Regency, West Java)
Abstrak: Muara Gembong merupakan daerah di Kabupaten Bekasi yang mengalami perubahan lingkungan akibat konversi hutan mangrove. Daerah yang paling terdampak adalah Desa Pantai Bahagia. Sebanyak 63% masyarakatnya mengalami penurunan pendapatan dan menjadikan produk olahan mangrove sebagai pendapatan alternatif. Penelitian ini bertujuan untuk (1) mengidentifikasi produk olahan mangrove, (2) menganalisis kelayakan usaha, (3) menganalisis pengaruh produk olahan mangrove terhadap kelestarian hutan mangrove, dan (4) menganalisis strategi pengembangan produk olahan mangrove. Metode penelitian yang digunakan adalah metode studi kasus, sedangkan metode analisis data yang digunakan yaitu Weighted Sum Model (WSM), analisis pendapatan, Revenue Cost of Ratio (R/C), Return of Investment (ROI), Payback Period (PP), deskriptif kualitatif serta Strengths, Weaknesses, Opportunities and Threats (SWOT). Berdasarkan hasil penelitian, dodol original, stik balado, dan sirup merupakan olahan mangrove yang paling layak untuk dikembangkan. Usaha produk olahan mangrove layak dilakukan berdasarkan kriteria kelayakan finansial. Produk olahan berpengaruh terhadap kelestarian hutan mangrove melalui perubahan pola pemanfaatan, pengelolaan ekosistem, dan kesediaan masyarakat untuk menanam mangrove. Strategi pengembangan yang dapat dilakukan yaitu menentukan segmentasi konsumen, optimalisasi pasar digital, bekerjasama dengan reseller dan dropshipper serta membuat produk olahan mangrove menjadi naik kelas., Muara Gembong is an area in Bekasi Regency that is experiencing environmental changes due to the conversion of mangrove forests. The most affected area is Pantai Bahagia Village. As many as 63% of the community experienced a decrease in income and made processed mangrove products as an alternative income. This study aims to (1) identify mangrove products, (2) Muara Gembong is an area in Bekasi Regency that is experiencing environmental changes due to the conversion of mangrove forests. The most affected area is Pantai Bahagia Village. As many as 63% of the community experienced a decrease in income and made processed mangrove products as an alternative income. This study aims to (1) identify processed mangrove products, (2) analyze business feasibility, (3) analyze the effect of processed mangrove products on the preservation of mangrove forests, and (4) analyze the strategy for developing mangrove processed products. The research method used is case study method, while the data analysis method used is Weighted Sum Model (WSM), income analysis, Revenue Cost of Ratio (R/C), Return on Investment (ROI), Payback Period (PP), qualitative descriptive and Strengths, Weaknesses, Opportunities and Threats (SWOT). Based on the research results, original dodol, balado sticks, and syrup are the most suitable mangrove products to be developed. The business of processing mangrove products is feasible based on financial feasibility criteria. Processed products affect the sustainability of mangrove forests through changes in utilization patterns, ecosystem management, and community willingness to plant mangroves. Development strategies that can be carried out are determining consumer segmentation, optimizing the digital market, collaborating with resellers and dropshippers and making processed mangrove products to be promoted.
Keyword: Alternative livelihood, Development analysis, Mangrove forest conservation, Mangrove forest conversion, Mangrove products

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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