Judul: Efektivitas penambahan zeolit dan karbon aktif pada pengangkutan benih ikan gurame dengan kepadatan tinggi
Abstrak: Giant gouramy is one of economically important fishes which generally cultured in West and Central Java, along with production (rearing) process mostly held in other areas of Java, Borneo, Sumatra, and Nusa Tenggara. Fry demands were supplied from culture areas by means of transportation. In this research, effectiveness of zeolite and activated carbon to maintain water quality of giant gouramy fry transportation were measured at 20 fish/ℓ, 30 fish/ℓ, 40 fish/ℓ, and 50 fish/ℓ density. This research indicated that the 40 fish/ℓ density gave the best result. It is shown by the survival rate (84,17%), daily growth rate (2,12%) and blood profile of fish approaching normal conditions. Based on these results, it was concluded that 40 fish/ℓ giant gouramy density is the best treatment for a three days transportation.
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Judul: Efektivitas penambahan zeolit 20g/ℓ, karbon aktif 10g/ℓ, dan garam dalam transportasi tertutup benih ikan gurame osphonemus gouramy Lac. dengan kepadatan tinggi
Abstrak: Fish transportation was usually held at high density to efficient the transportation cost, but Higher density of fish carried inside the container will be increase stress level of fish. Some stress will result in increased activity of fish physycology that could worst the water quality especially DO, CO2, and NH3. This research aimed to evaluate the effectifity of salt utilization in water transport media which had been given by zeolite and active carbon to maintain water quality of transport media, so the mortality during transportation of gouramy fish size ±4 cm can can be minimize during transportation. The research was conducted in laboratory scale with complete randome device. Gouramy fish Osprhonemus gouramy which use for this experiment were exsposed to five different doses and applied in two replications. Every treatment was describe A)blanko 50 fishes/ℓ (without zeolite, active carbon, and salt); B)control 50 fishes/ℓ + 20 g/ℓ zeolite + 10 g/ℓ active carbon; C) 50 fishes/ℓ + 20 g/ℓ zeolite + 10 g/ℓ actvive carbon, 1 g/ ℓ salt; D) 50 fishes/ℓ + 20 g/ℓ zeolite + 10 g/ℓ active carbon, 3 g/ℓ salt; and E) 50 fishes/ℓ + 20 g/ℓ zeolite + 10 g/ℓ active carbon, 5 g/ℓ salt. The package system was transported for 72 hour. Survival rate during transportation in every treatment A, B, C, D, and E was 0%, 57%, 59%, 65%, dan 74%. The result of this research showed that treatment E gave the best result seen from the survival rate (SR) with 74 %, associated with the transport medium water quality values had level of total amonia nitrogen (TAN) 1.619±0.28, NH3 0.069±0.016, DO 4,26 mg/ℓ and has the best specific growth rate 2.95%, and 100% of survival rate during post-transportation test.
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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