Judul: Community Structure and Distribution Bentic Mollusc Taxes in Mangrove Ecosystem in Kuala Langsa, East Aceh
Abstrak: Keanekaragaman moluska bentik di ekosistem mangrove Kuala Langsa, Aceh Timur belum banyak dipelajari. Tujuan dari penelitian ini untuk mengidentifikasi dan menganalisis keanekaragaman moluska bentik yang berkaitan dengan ekosistem mangrove. Pengambilan data mangrove dan sampel moluska bentik menggunakan transek kuadrat 10×10 m2 , 5×5 m2 , dan 1×1 m2 dengan metode purposive sampling. Moluska bentik yang ditemukan pada lokasi penelitian terdiri dari dua kelas dan 17 spesies. Keterkaitan moluska bentik terhadap vegetasi mangrove menggunakan Correspondent Analysis (CA) menunjukkan bahwa C. nicobaricum dan E. aurisjudae berasosiasi erat dengan mangrove Avicennia sp.. Hasil juga menunjukkan C. carcellesi, N. polita, dan P. glaucum berasosiasi erat dengan mangrove R. apiculata. Keterkaitan stasiun terhadap parameter lingkungan menggunakan Principal Component Analysis (PCA) menunjukkan bahwa Stasiun 1 dipengaruhi kuat oleh parameter salinitas dan suhu sedangkan Stasiun 2 dan Stasiun 3 dipengaruhi kuat oleh substrat berpasir.
Keyword: bentic molluscs, distribution, diversity, mangroves, relatedness

Judul: Struktur Komunitas Meiofauna Pada Ekosistem Mangrove Kuala Langsa, Aceh Timur
Abstrak: Meiofauna merupakan hewan metazoa diantara makrofauna dan mikrofauna yang hidup di ruang antar partikel sedimen dan berperan penting dalam kesuburan perairan. Tujuan penelitian ini adalah untuk mengetahui struktur komunitas meiofauna dengan karakteristik fisika-kimia pada ekosistem mangrove Kuala Langsa, Aceh Timur. Penelitian dilakukan pada 29 Agustus 2022 di 3 Stasiun. Sampel meiofauna diambil menggunakan pipa paralon atau corer (ø: 5 cm; tinggi: 10 cm). Sejumlah parameter fisika-kimia lingkungan diukur dan dianalisa hubungannya menggunakan analisis komponen utama (PCA) dan analisis korespondensi (CA) dengan hasil ditemukannya banyak meiofauna dan ragam jenis mangrove pada Stasiun 3. Hasil pengamatan meiofauna pada ekosistem mangrove Kuala Langsa terdiri dari 8 filum, 12 kelas, 17 ordo, 22 famili, dan 23 genus dengan dominasi Platyhelminthes. Jenis mangrove yang mendominasi adalah spesies Rhizophora mucronata. Kelimpahan meiofauna banyak ditemukan pada wilayah penelitian dengan dominasi substrat pasir, kerapatan mangrove dan bahan organik yang tinggi., Meiofauna is a metazoan animal between macrofauna and microfauna that lives in spaces between sediment particles and plays an important role in water fertility. The purpose of this study was to determine the meiofauna community structure with physicochemical characteristics in the Kuala Langsa mangrove ecosystem, East Aceh. Research was conducted on August 29, 2022 at 3 Stations. The meiofauna samples were taken using a paralon pipe or corer (ø: 5 cm; height: 10 cm). A number of environmental physico-chemical parameters were measured and analyzed using principal component analysis (PCA) and correspondence analysis (CA) with the results discovery of many meiofauna and variety of mangrove species at Station 3. The results of meiofauna observations in the Kuala Langsa mangrove ecosystem consisted of 8 phyla, 12 classes, 17 orders, 22 families, and 23 genus with the dominance of Platyhelminthes. The dominating mangrove species is Rhizophora mucronata. Abundance of meiofauna is found in research area with the dominance of sand substrate, mangrove density and high organic matter.
Keyword: Abundance, Kuala Langsa, Mangrove, Substrate

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