Judul: Community Structure and Distribution of Macrozoobenthos in Bojonegara Coastal Waters, Banten Bay, Indonesia
Abstrak: Penelitian ini bertujuan untuk mengetahui struktur komunitas dan distribusi makrozoobentos di perairan pantai Bojonegara, Teluk Banten. Penelitian ini dilaksanakan selama lima bulan pada bulan Januari, Februari, Agustus, September dan Oktober 2020 di enam titik stasiun. Pengambilan sampel makrozoobentos dilakukan menggunakan Van Veen Grab, sedangkan pengambilan data parameter fisik kimia perairan dilakukan secara in-situ dan eks- situ. Struktur komunitas makrozoobentos didapatkan melalui analisis kepadatan, komposisi jenis, indeks keanekaragaman, indeks keseragaman dan indeks dominansi. Hubungan makrozoobentos dengan lingkungan dianalisis menggunakan PCA dan indeks similaritas. Makrozoobentos yang diperoleh selama penelitian terdiri dari 6 filum (Moluska, Annelida, Arthropoda, Echinodermata, Nematoda, dan Sipuncula), 8 kelas dan 77 genera, di antaranya Bivalvia (18) , Gastropoda (37), Polychaeta (12), Malacostraca (4), Echinoidea (2), dan masing- masing 1 genera untuk Chromadorea, Scapopoda, dan Sipunculidea. Kelas Bivalvia dan Gastropoda merupakan jenis makrozoobentos yang ditemukan di seluruh stasiun. Analisis Komponen Utama (PCA) menunjukkan adanya korelasi positif antara Bivalvia, Gastropoda, Sipunculidea dengan parameter kecerahan dan salinitas. Echinoidea dan Scapopoda dipengaruhi oleh parameter suhu, sedangkan Polychaeta, Malacostraca dan Chromadorea dipengaruhi oleh parameter pH., The study aims to determine the community structure and distribution of macrozoobenthos in the coastal waters of Bojonegara, Banten Bay. The study was conducted for five months in January, February, August, September and October 2020 on six stations. Macrozoobenthos sampling was carried out using Van Veen Grab, while the physical and chemical parameters of the waters were observed in situ and ex-situ. The community structure of macrozoobenthos was obtained by analyzing the density, species composition, diversity index, evenness index and dominance index. The relationship of macrozoobenthos with the environment was analyzed using PCA and the similarity index. The results of the study showing that there were 6 phyla belong to macrozoobenthos (Molluscs, Annelids, Arthropods, Echinoderms, Nematodes, and Sipuncula), 8 classes and 77 genera, namely; Bivalvia (18), Gastropoda (37), Polychaeta (12), Malacostraca (4), Echinoidea (2), and respectively 1 genus for Chromadorea, Scapopoda, and Sipunculidea. The class of Bivalvia and Gastropoda were types of macrozoobenthos that mostly found at all stations. Principal Component Analysis (PCA) showed a positive correlation between Bivalves, Gastropods, Sipunculidea with transparency and salinity parameters. Echinoidea and Scapopoda were influenced by temperature parameters, while, Polychaeta, Malacostraca and Chromadorea were influenced by pH parameters.
Keyword: Banten Bay, community structure, macrozoobenthos, PCA, Banten Bay, community structure, macrozoobenthos, PCA

Judul: Community Structure of Plankton in Bojonegara Coastal Area, Banten Bay
Abstrak: Perairan pantai Bojonegara mendapat tekanan antopogenik yang tinggi melalui kegiatan industri, pemukiman, dan pembangunan infrastruktur. Tekanan antropogenik tersebut dapat memberikan dampak buruk bagi ekosistem perairan. Penelitian ini bertujuan menganalisis struktur komunitas plankton di wilayah perairan pantai Bojonegara. Penelitian dilakukan pada Bulan Januari, Februari, Agustus, September, dan Oktober 2020 pada 6 stasiun pengambilan data. Analisis data meliputi kelimpahan, indeks keanekaragaman, keseragaman, dominansi, regresi linear, principle component analysis, dan indeks similaritas Bray-Curtis. Parameter perairan yang mendukung kehidupan plankton di Bojonegara adalah salinitas, pH, nitrat, dan fosfat. Hasil penelitian menunjukkan bahwa fitoplankton didominasi oleh Bacillariophyceae dan Cyanophyceae, sedangkan zooplankton didominasi oleh Malacostraca dan Ciliata. Kelimpahan fitoplankton berkisar antara 3,0x10^5 – 8,7x10^5 sel/L, sedangkan zooplankton berkisar antara 2,8x10^4 – 9,9x10^4 ind/L. Plankton memiliki indeks keanekaragaman sedang, indeks keseragaman sedang, dan tidak terjadi dominansi. Struktur komunitas plankton menunjukkan bahwa perairan ini mendapat tekanan ringan dari lingkungan., Bojonegara coastal waters are subject to high anthropogenic pressure through industrial activities, residences, and infrastructure development. This anthropogenic pressure can harm aquatic ecosystems. This study aimed to analyze the plankton community structure at Bojonegara coastal area. This study conducted in January, February, August, September, and October 2020 at six data collecting stations. Data analysis included abundance, diversity, evenness, dominance, linear regression, principle component analysis, and Bray-Curtis similarity index. Water parameters show that salinity, pH, nitrate, and phosphate support plankton life in Bojonegara. Study result showed that phytoplankton are dominanted by Bacillariophyceae and Cyanophyceae, while zooplankton are dominated by Malacostraca and Ciliata. Phytoplankton abundance varied 3,0x10^5 – 8,7x10^5 cells / L, while zooplankton abundance varied 2,8x10^4 - 9,9x10^4 ind / L. Plankton has moderate diversity index, moderate evenness index, and no species dominance. The plankton community structure shows that Bojonegara waters are receiving light pressure from the environment.
Keyword: Bojonegara, community structure, plankton

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