Judul: Spatial Temporal Distribution of Female  Short Mackerel (Rastrelliger brachysoma, Bleeker, 1851) in WPP 712 Based on e Logbook
Abstrak: Ikan kembung perempuan (Rastrelliger branhyosoma) merupakan salah satu jenis ikan ekonomis penting yang umum ditangkap di Wilayah Pengelolaan Perikanan Republik Indonesia (WPPNRI) 712. Penelitian ini berfokus pada wilayah WPP 712 dengan menggunakan data sekunder yang diperoleh dari e-logbook Sistem Informasi Logbook Penangkapan Ikan (SILOPI) Kementerian Kelautan dan Perikanan Republik Indonesia. Penangkapan ikan kembung yang dilakukan nelayan menggunakan 12 jenis alat tangkap dengan alat tangkap dominan yang digunakan adalah pukat cincin. Catch per unit effort (CPUE) ikan kembung perempuan di WPP 712 selama 5 tahun terakhir memiliki nilai yang fluktuatif dan cenderung menurun. Analisis model produksi surplus (MPS) yang dilakukan dengan 5 macam model menujukan model Clarke Yhosimoto Pooley dengan koefisien determinasi (R2) sebesar 81,55% sebagai model yang paling menggambarkan kondisi sesungguhnya. Status stok ikan kembung perempuan dalam kurun waktu 5 tahun terakhir tergolong underfishing. Distribusi daerah penangkapan secara spasial dan temporal selalu mengalami perubahan dengan dominasi lokasi penangkapan berada di bagian utara pekalongan., The female Indian mackerel (Rastrelliger branhyosoma) is one of the economically important fish species commonly caught in the Republic of Indonesia Fisheries Management Area (WPPNRI) 712. This study focuses on the WPP 712 area using secondary data obtained from the e-logbook of the Fishing Logbook Information System (SILOPI) of the Ministry of Maritime Affairs and Fisheries of the Republic of Indonesia. Mackerel fishing by fishermen uses 12 types of fishing gear with the dominant gear used is purse seine. Catch per unit effort (CPUE) of female mackerel in WPP 712 for the last 5 years has a fluctuating value and tends to decrease. Analysis of the production surplus model (MPS) conducted with 5 different models showed the Clarke Yhosimoto Pooley model with a coefficient of determination (R2) of 81.55% as the model that best describes the real conditions. The stock status of female mackerel in the last 5 years is classified as underfishing. The spatial and temporal distribution of fishing areas always changes with the dominance of fishing locations in the northern part of Pekalongan.
Keyword: fishing grounds, fishing gear, stock status, female mackerel, WPP 712

Judul: Tangkapan Maksimum Lestari Ikan Kembung Lelaki (Rastrelliger kanagurta Cuvier, 1816) di Perairan Utara Jawa (WPPNRI 712)
Abstrak: WPP 712 merupakan wilayah dengan potensi sumberdaya ikan pelagis kecil yang tinggi. Ikan kembung lelaki (Rastrelliger kanagurta) merupakan ikan pelagis kecil yang bernilai ekonomis penting dan banyak ditangkap di perairan WPP 712 sehingga dikhawatirkan dapat menyebabkan overfishing. Penelitian ini bertujuan menentukan jumlah tangkapan maksimum lestari (MSY), upaya penangkapan maksimum lestari (fMSY), dan jumlah tangkapan yang diperbolehkan (TAC) untuk ikan kembung lelaki (R. kanagurta) di perairan Utara Jawa (WPPNRI 712). Penelitian ini menggunakan data sekunder yang diperoleh dari data e-logbook penangkapan ikan tahun 2018–2022 dalam aplikasi database Sistem Informasi Logbook Penangkapan Ikan (SILOPI). Model produksi surplus menggunakan model Schaefer menunjukkan nilai MSY dan fMSY ikan kembung lelaki masing-masing sebesar 147,66 ton/tahun dan 478,89 trip/tahun dengan jumlah tangkapan yang diperbolehkan (TAC) sebesar 118,12 ton/tahun. Hasil tangkapan dan upaya penangkapan aktual lebih kecil dari nilai MSY dan fMSY yang mengindikasikan bahwa ikan kembung lelaki di WPP 712 dalam kondisi underfishing., FMA 712 is an area with a high potential for small pelagic fish resources. The Indian mackerel (Rastrelliger kanagurta) is a small pelagic fish species of significant economic value and is widely caught in the waters of FMA 712, raising concerns about overfishing. This study aims to determine the maximum sustainable yield (MSY), maximum sustainable fishing effort (fMSY), and total allowable catch of Indian mackerel (R. kanagurta) in Northern Java Waters (FMA 712). This study uses secondary data obtained from e-logbook records of fish catches from 2018–2022 within the database application known as the Fisheries Logbook Information System (SILOPI). The surplus production model, using the Schaefer model, indicates that the MSY and fMSY for Indian mackerel are 147,66 tons/year and 478,89 trips/year, with a total allowable catch (TAC) of 118,12 tons/year. The actual catch and fishing effort is lower than MSY and fMSY indicating that Indian mackerel resources in FMA 712 are in an underfishing condition.
Keyword: CPUE, surplus production model, sustainable potential, total allowable catch

Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4