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 budidaya udang galah (Macrobrachium rosenbergii) dan ikan tambakan (Helostoma temmincki) intensif berbasis Integrated Multi Thropic Aquaculture dengan kepadatan berbeda
Abstrak: IMTA (Integrated Multi Thropic Aquaculture) is a aquaculture system that integrates several organisms and focuses on the trophic level differences of each organism. IMTA will be able to improve the quality of the water and of course have a direct impact on survival rate, stocking density and increase the growth rate. The research was using completely randomized design at many treatments in the form of initial stocking density difference between freshwater giant prawns and tambakan that UG20TM50 20 prawns/m2 and 50 tambakan/m2, UG20TM100 20 prawns/ m2 and 100 tambakan/ m2. Each treatment was repeated three times. The best treatment Based on 60 days cultivation was UG20TM50 with the survival rate of freshwater giant prawn (75.83±6.29%), spesific growth rate (3.02±0.16%), total production (3065.44±79.95g) and survival rate of tambakan (80±1.32%) spesific growth rate (2.94±0.25%) and total production (10723.47±975.21g), and supported by a temperature (28.90–31.67°C), pH (6.50– 7.87), DO (4.08–5.7 mg/L), ammonia (0.00010–0.0413) mg/L.
Keyword: Bogor Agricultural University (IPB), water quality., tambakan, IMTA, freshwater giant prawn

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