Judul: Community Structure of Bivalve in Coastal Area of Panjang Island and Tarahan Island, Banten and Variation of Shell’s size measure.
Abstrak: Coastal areas of Panjang island and Tarahan island has variety of substrates such as sand, and coral reef. This made possible the existence of bivalve community in this areas. The research was purposed to know the community structure of bivalves in the areas and the variation of shell size. This research had been done in May 2008 until September 2008. Samples of bivalve were taken by using randomly kuadrant transect method. The diversity index are ranged from 0.45 to 1.59, evenness index are ranged from 0.10 to 0.48, dominant index are ranged from 0.24 to 0.78, and similarity index are ranged from 0.18 to 0.50. Gafrarium divaricatum has obesity value (%Obesity) are ranged from 43.60% to 66.28%, while the relative height are ranged from 80.66% to 93.49%. Perna viridis has obesity value (%Obesity) are ranged from 19.09% to 38.67%, while the relative height are ranged from 38.17% to 71.60%. Keyword: Community structure, Bivalve, Variation of shell size
Keyword: 

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: 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