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.
Keyword: 

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: 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