Judul: Analysis and Business Prospects of Discus Fish Symphysodon sp. Farming
Abstrak: Ikan diskus memiliki nilai jual yang tinggi dan menarik minat masyarakat untuk melakukan bisnis ikan tersebut, namun sebagai kegiatan usaha perlu diketahui apakah budidaya ikan diskus merupakan bisnis yang menguntungkan. Oleh karena itu, perlu adanya analisis usaha untuk menilai prospek usaha yang dapat dicapai dalam bisnis budidaya ikan diskus. Penelitian ini bertujuan menelaah prospek usaha budidaya ikan diskus Symphysodon sp. melalui kajian kinerja produksi dan analisis usaha. Studi kasus dilakukan pada 5D Discus Farm, dengan fokus pada jenis diskus leopard dan pigeon. Hasil penelitian menunjukkan kinerja produksi diskus leopard diperoleh kelangsungan hidup 68,66%, laju pertumbuhan bobot mutlak 0,141 g/hari, laju pertumbuhan panjang mutlak 0,015 inci/hari, laju pertumbuhan bobot spesifik 2,215%, laju pertumbuhan panjang spesifik 1,206%, dan koefisien keragaman panjang 16,51%, sedangkan diskus pigeon diperoleh kelangsungan hidup 65,23%, laju pertumbuhan bobot mutlak 0,159 g/hari, laju pertumbuhan panjang mutlak 0,014 inci/hari, laju pertumbuhan bobot spesifik 2,210%, laju pertumbuhan panjang spesifik 0,885%, dan koefisien keragaman panjang 13,03%. Hasil perhitungan analisis usaha menunjukkan usaha diskus leopard menghasilkan R/C ratio sebesar 2,55 dan payback period sebesar 0,74 tahun, sedangkan diskus pigeon menghasilkan R/C ratio sebesar 2,39 dan payback period sebesar 0,82 tahun. Hasil menunjukkan usaha budidaya diskus leopard dan pigeon menguntungkan dan layak untuk dijalankan., Discus has a high selling value and attracts people to do business on discus, but as a business activity it is necessary to know whether discus rearing is a profitable business. Therefore, a business analysis is required to assess the business prospects of discus farming business. This study aims to examine the business prospects of discus, Symphysodon sp., farming through production performance studies and business analysis. A case study was conducted at 5D Discus Farm, focusing on leopard and pigeon discus types. The results showed that the production performance of leopard discus obtained 68.66% survival rate, 0.141 g/day absolute weight growth rate, 0.015 inches/day absolute length growth rate, 2.215% specific weight growth rate, 1.206% specific length growth rate, and 16.51% length coefficient of variance, while in pigeon discus was obtained 65.23% survival rate, 0.159 g/day absolute weight growth rate, 0.014 inches/day absolute length growth rate, 2.210% specific weight growth rate, 0.885% specific length growth rate, and 13.03% length coefficient of variance. The results of the business analysis show that the leopard discus business has an R/C ratio of 2.55 and payback period of 0.74 years, while pigeon discus farming has an R/C ratio of 2.39 and a payback period of 0.82 years. Those business analysis shows that leopard and pigeon discus farming is profitable and feasible.
Keyword: analisis usaha, kinerja produksi, performa reproduksi, pertumbuhan

Judul: Produktivitas Budidaya Ikan Diskus Symphysodon sp. Pada Rasio Media-Ikan 2 hingga 5 Liter per Ekor
Abstrak: Increasing density will be followed by increasing production if it has a good environment and feed accomplished. The purpose of this experiment was to determine the optimal discus fish Symphysodon sp. production in term of growth, survival rate, feed efficiency and economic aspect. The design of the experiment was randomized complete design with 4 treatments and 3 replications. The discus seeds at average lenght of 2.60 + 0.01 cm and of weight 1.36 + 0.01 g were reared at volume of 60 liters. Tubificide feed was given twice a day at satiation level. 50% of the media in the aquarium was replaced with fresh water daily. The result showed that lowering media-fish ratio affected the weight and the growth, but did not affect the survival rate, the feed efficiency value and the length variety coefficient. Based on economic analyze, the highest gain was achieved by the media-fish ratio of 3 L/fish.
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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