Judul: Relationship between Mangrove Ecosystem Conditions and  Fish Resource Diversity in the Mangrove Sari Tourism Area, Kaliwlingi, Brebes,  Central Java
Abstrak: Ekosistem mangrove merupakan salah satu ekosistem pesisir yang memiliki fungsi ekologi dan ekonomi penting. Salah satu fungsi ekologi adalah sebagai habitat bagi berbagai jenis ikan. Hubungan ekosistem mangrove dengan keanekaragaman ikan di Kawasan Wisata Mangrove Sari Brebes hingga saat ini masih belum banyak diteliti lebih lanjut. Penelitian ini bertujuan menganalisis keterkaitan antara struktur komunitas mangrove dan ikan di Kawasan Wisata Mangrove Sari Brebes. Penelitian dilaksanakan selama 4 bulan (November 2023 hingga Februari 2024) di Kawasan Wisata Mangrove Sari Brebes pada tiga stasiun pengamatan. Hasil penelitian menunjukkan bahwa kerapatan mangrove tertinggi di Stasiun 1. Ekosistem mangrove di Pandansari termasuk dalam kategori rapat dengan didominasi oleh mangrove jenis Rhizophora mucronata dan R. apiculata. Total hasil tangkapan ikan dari tiga stasiun sebanyak 4940 individu dengan keanekaragaman ikan dalam kategori sedang dan ikan tersebar secara merata serta tidak terdapat jenis ikan yang mendominasi. Kerapatan mangrove dengan keanekaragaman ikan di Kawasan Wisata Mangrove Sari memiliki hubungan yang positif., Mangrove ecosystem is a coastal ecosystem that has important ecological and economic functions. One of the ecological functions as a habitat for various types of fish. Relationship between the mangrove ecosystem and fish diversity in the Mangrove Sari Brebes Tourism Area has not yet been studied further. This research aims to analyze the relationship between the structure of mangrove communities and fish in the Mangrove Sari Brebes Tourism Area. Research was carried out for 4 months (November 2023 to February 2024) in the Mangrove Sari Brebes Tourism Area at three observation stations. The research results show that the highest mangrove density is at Station 1. Mangrove ecosystem in Pandansari is included in the dense category, dominated by mangrove types Rhizophora mucronata and R. apiculata. Total fish catch from three stations is 4940 individuals with fish diversity in the medium category and fish are evenly distributed and there are no dominating fish species. Mangrove density with fish diversity in Mangrove Sari Tourism Area have a positive relationship.
Keyword: Brebes, ikan, Tourism, Brebes, Fish, Mangroves

Judul: Mangrove Ecotourism Services Assessment in Mangrovesari Marine Tourism Village, Kaliwlingi, Brebes Regency, Central Java
Abstrak: Wilayah pesisir Kabupaten Brebes memiliki kawasan mangrove dengan potensi nilai ekonomi yang tinggi. Salah satu jasa ekosistem mangrove adalah jasa budaya berupa ekowisata. Desa Wisata Bahari Mangrovesari mengalami penurunan kondisi lingkungan yang disebabkan oleh kurangnya informasi mengenai penilaian terhadap jasa ekowisata mangrove. Penelitian ini bertujuan menghitung nilai ekonomi ekowisata mangrove, serta mengidentifikasi faktor-faktor yang mempengaruhi kegiatan wisata. Metode penarikan sampel yang digunakan dalam penelitian ini purposive sampling dengan teknik pengumpulan data berupa wawancara. Valuasi dilakukan menggunakan Willingness to Pay (WTP) dan Travel Cost Method (TCM). Nilai ekonomi ekowisata mangrove Desa Wisata Bahari Mangrovesari dari pendekatan WTP sebesar Rp 490.524.000/tahun, sedangkan nilai ekonomi yang diperoleh dari pendekatan TCM sebesar Rp 170.028.000/tahun. Faktor-faktor yang berpengaruh nyata dalam kesediaan membayar adalah pendidikan dan pendapatan. Faktor-faktor yang yang berpengaruh nyata dalam jumlah kunjungan wisata diataranya, pendidikan, waktu luang, dan biaya perjalanan., The coastal area of Brebes Regency has mangrove areas with high potential value. One of the mangrove ecosystem value is cultural services in the form of ecotourism. Mangrovesari Marine Tourism Village has experienced a decline in environmental conditions caused by a lack of information regarding the valuation of mangrove ecotourism services. This study aims to calculate the economic value of mangrove ecotourism, and identify factors that influence tourism activities. The sampling method used in this study was purposive sampling with data collection techniques in the form of interviews. Valuation is done using Willingness to Pay (WTP) and Travel Cost Method (TCM). The economic value of mangrove ecotourism in Mangrovesari Marine Tourism Village from the WTP approach amounted to IDR 490,524,000/year, while the economic value obtained from the TCM approach amounted to IDR 170,028,000/year. Factors that have a real effect on willingness to pay are education and income. Factors that have a real effect on the number of tourist visits include education, leisure time, and travel costs.
Keyword: economic value, mangrove ecotourism, Travel Cost Method, Willingness to Pay

Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition