Judul: Keanekaragaman Jenis Udang Air Tawar di Sungai-Sungai yang Berasal dari Gunung Salak
Abstrak: Freshwater prawn is a crustacean that has an important role in maintaining the balance of freshwater ecosystems. Biodiversity of freshwater prawn research was conducted in the rivers where upstream on Salak Mountain, Bogor, West Java. This study was aimed to find out information on species biodiversity of freshwater prawn in rivers where come from Mount Salak. Sampling stations were 11 points in the rivers where upstream on Mount Salak by road sampling. There was three species of freshwater prawns, namely Macrobrachium lanchesteri (3 specimens), M. empulipke (6 specimens), and M. sintangense (50 specimens). M. sintangense, most commonly found species, mainly found in the slow water with mud substrate. M. empulipke found in rocky habitats with faster water flow, while M. lanchesteri alien species that was found in swift water stream. This species can survive in extreme conditions and could be a superior competitor for local spesies
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Judul: Keanekaragaman Ketam di Sungai yang Berhulu dari Gunung Salak, Bogor, Jawa Barat
Abstrak: Freshwater crab is decapods crustacean of infraorder Brachyura. Freshwater crabs are one of the most ecologically important macro-invertebrate groups in tropical inland waters. The objective of this research was to assess the diversity of freshwater crabs in rivers of mount Salak, Bogor, West Java. Freshwater crabs were taken from eleven sites. Identification based on morphological characteristic and verified by DNA barcode. Three species of freshwater crabs were found Salak Mountain, that are Geosesarma sp., Parathelphusa bogoriensis and Parathelphusa convexa. Those three species were commonly found in Java. Geosesarma sp. can be found around rocks on river banks. Parathelphusa bogoriensis can be found at the brook or under rocks. Parathelphusa convexa can be found on river banks.
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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