Judul: Kualitas media budidaya dan produksi udang galah (Macrobrachium rosenbergii) yang dipelihara pada sistem IMTA (Integrated Multi Trophic Aquaculture) dengan kepadatan berbeda
Abstrak: Improving water quality and stocking densities are expected to increase freshwater giant prawn production. By using IMTA system is aimed to improve water quality which can increase survival rate, stocking densities, growth rate, and economically profitable. This research was carried out with complete random design with 3 treatments. The treatments were (A) 10 prawn/m2, (B) 20 prawn/m2, (C) 30 prawn/m2 of stocking densities, each treatments had 3 replication. Water flow was integrated with freshwater giant prawn cultivation and biofilter systems. Cultivation of freshwater giant prawn during 72 days in IMTA system had better treatment at 10 prawn/m2 densities. That treatment had temperature (25 – 31.3°C), pH (6.6 – 8.0), dissolved oxygen (3.0 – 5.7 mg/L), nitrate (0.081 – 0.338 mg/L), phosphate (0.152 – 0.338 mg/L) which still good for cultivation, the low of amonia (0.0002 – 0.0593 mg/L) and nitrite (0.007 – 0.109 mg/L), and also has the best survival rate, growth rate, final body weight, and economic return
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Judul: Teknologi Pembesaran Udang Galah (Macrobrachium Rosenbergii De Man) Sistem Terpadu Dengan Kepadatan Berbeda Berbasis Integrated Multi Trophic Aquaculture
Abstrak: Sistem IMTA (Integrated Multi Thropic Aquaculture) merupakan teknologi atau sistem budidaya yang dapat mengurangi dampak limbah dari suatu organisme dan menyeimbangkan kondisi lingkungan budidaya secara umum. Pada penelitian ini digunakan Rancangan Acak Lengkap dengan perbedaan padat tebar yaitu udang galah 13 ekor/m2 ikan tambakan 80 ekor/m2 (A) dan udang galah 13 ekor/m2 ikan tambakan 40 ekor/m2 (B). Perlakuan yang digunakan diulang tiga kali dengan masa pemeliharaan selama 60 hari. Perlakuan terbaik didapatkan pada perlakuan B ditandai dengan udang galah mendapatkan SR (85,33±1,88%), laju pertumbuhan harian (1,31±0,02%), hasil produksi (4736,03±248,20 gram), pada ikan tambakan didapatkan SR (79,23±6,05%), laju pertumbuhan harian (1,76±0,02%), hasil produksi (22166,96±1558,55 gram), serta dengan kualitas air yaitu DO (3,73-5,73) mg/L, pH (6,67-9,90), suhu (26,33-30,67) ºC, nitrit (0,04-0,11) mg/L dan amonia (0,017-0,235) mg/L.
Keyword: udang galah, IMTA, ikan tambakan, kualitas air

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology