Judul: Effectiveness of LED Light Spectrum Exposure on Growth Performance and Color Quality of Puntius denisonii Fish
Abstrak: The Puntius denisonii fish is a type of freshwater ornamental fish that has a characteristic silver body and torpedo torpedo body shape. The purpose of this study was to analyze the growth performance and changes in the color quality of Puntius denisonii fish due to exposure to different light spectrum in the maintenance medium. The maintenance of Puntius denisonii was carried out in an aquarium measuring 30 x 30 x 30 cm3 for 21 days. The research process used a completely randomized design with five treatments and three replications. The type of treatment in this study consisted of control (room light), and a spectrum of LED light with different wavelengths and different colors including green, blue, red, and white. The results of research on manipulation of the cultivation environment using a light spectrum namely the color quality with the best results found in the red LED spectrum treatment, and growth with the best results is in the green LED spectrum.
Keyword: LED, Puntius denisonii, light spectrum

Judul: Efektivitas Paparan Spektrum Lampu LED terhadap Kualitas Warna dan Kinerja Pertumbuhan Ikan Rainbow Praecox Melanotaenia praecox
Abstrak: Ikan rainbow praecox Melanotaenia praecox merupakan ikan endemik Irian Jaya dengan warna tubuh biru keperakan dan sirip berwarna merah. Tujuan penelitian ini adalah mengukur perubahan kualitas warna ikan dan kinerja pertumbuhan rainbow praecox Melanotaenia praecox dengan paparan spektrum cahaya lampu LED pada media pemeliharaan. Ikan rainbow praecox yang digunakan untuk penelitian selama 28 hari memiliki ukuran 2,74±0,261 cm dengan bobot 0,346±0,061 gram dan dipelihara di dalam akuarium dengan ukuran 25x25x25 cm. Pakan yang diberikan adalah cacing sutra dengan frekuensi 3 kali sehari secara ad satiation. Perlakuan yang diberikan adalah penyinaran lampu LED dengan 5 perlakuan dan masing-masing 3 kali ulangan yaitu B (LED biru), M (LED merah), P (LED putih), H (LED hijau), dan K (kontrol). Hasil pengukuran kualitas warna biru pada ikan yang terbaik pada perlakuan B sebesar 0,423±0,029%, sedangkan kualitas warna merah terbaik pada perlakuan M sebesar 0,435±0,049%. Perlakuan M memberikan kinerja pertumbuhan terbaik dengan bobot mutlak 0,013±0,002 gram, laju pertumbuhan harian sebesar 2,642±0,261%, dan efisiensi pakan 0,061±0,009%.
Keyword: kualitas warna, kinerja pertumbuhan, LED, rainbow praecox, spektrum cahaya

Judul: Penyelesaian Masalah Rotasi Aliran Fluida Kental Von Karman Menggunakan Metode Homotopi
Abstrak: Von Karman equation is an equation that describes fluid viscous flow induced by infinite disk rotation. By assuming steady flow and laminar, viscous incompressible fluid flow is represented in Von Karman equation by an angular velocity and the vertical direction velocity as the independent variables. Von Karman equation is a nonlinear problem that is solved using the homotopy method. The use of homotopy method is done by defining an homotopy function that requires auxiliary parameters to control the convergent region of the solution. The solution is a recursive formula with given initial conditions. Using software based-functional shows that velocity components converge to a value.
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