Judul: Distribusi spasial ikan karang dan hubungannya dengan terumbu karang (Kasus perairan pesisir Bahodopi, Teluk Tolo Kabupaten Morowali Provinsi Sulawesi Tengah)
Abstrak: Reef fish spatial distribution and their assemblages in coral reefs were studied in Bahodopi coastal waters in Tolo Gulf. A total of 2849 individuals from 66 species and 17 families were recorded in 10 stations in the study area covering reef flat and reef slope. Totally 1367 individuals were recorded in the reef flat and 1482 individuals in reef slope stations. Among the three fish groups living in the coral reefs, there found that the most abundant fish were Major and Target fish groups consisting family of Pomacentridae, Acanthuridae, Labridae and Serranidae. Community structure analyses showed that diversity (H’) and Evennes (E) indexes were significantly high according to the categories. The ranges of the two index were 3,61 – 3,69 and 0,82 – 0,93 respectively. Spatial distribution of reef fish in the species level was not significant, but in the level of species groups, the spatial distributions were better. Mayor and target reef fish play an important role in the study area.
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Judul: Struktur Komunitas Ikan pada Ekosistem Terumbu Buatan di Perairan Pulau Karya dan Pulau Harapan, Kabupaten Administrasi Kepulauan Seribu, DKI Jakarta
Abstrak: Coral reef is the most extensive and highly productive marine ecosystems located in the tropical ocean. The purpose of this study was to examine the structure of reef fish communities in artificial reef in Karya and Harapan Island using parameters, such as reef fish species and family abundance, reef fish trophic level, diversity, eveness, and dominance index. Based on the highest family composition of reef fish in an observation station of Karya and Harapan Island, the most dominating are Pomacentridae (Amblyglyphidodon curacao and Pomacentrus lepydogenis) and Labridae (Cirrhilabrus cyanopleura. Reef fish that are often found trofik level in the artifical reef is herbivorous reef fish 50 % (550 individuals), while reef fish that are often found based on fish group of reef fishes is major reef fish (854 individual). There are no domination by particular species on both stations. High diversity index was present, while both the stations are not significantly different with each other using Hutchinson test, uniformity index is high
Keyword: Bogor Agricultural University (IPB), trophic level, ecology indeks, abundance of reef fish

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