Judul: Pemanfaatan alat pengusangan cepat (APC) IPB 77-1 MM untuk pendugaan vigor daya simpan benih kedelai (Glycine Max (L.) Merr.)
Abstrak: The research was conducted at the Laboratory of Seed Science and Technology, Department of Agronomy and Horticulture, Faculty of Agriculture, Bogor Agricultural Institute from April to May 2012. The objective of the research was to test the utilization of Rapid Aging Tools (APC) IPB 77-1 MM to estimate the shelf life vigor of soybean (Glycine max (L.) Merr.) seed and to obtain the procedures for using APC IPB 77-1 MM. This research used physical accelerated aging and chemical accelerated aging on soybean seed of different vigor levels by using APC IPB 77-1 MM. The working principle of this tool is aging seed with a scourging heat vapor for physical accelerated aging and the steam of 95% ethanol for chemical accelerated aging during a given period. The results showed that APC IPB 77-1 MM can be used to estimate the shelf life of soybean seed vigor with physical accelerated aging and chemical accelerated aging. However, a method of physical accelerated aging more consistent than with chemical accelerated aging. Physical accelerated aging conducted using a scourging heat vapor for 0, 1×15, 2×15, 3×15 dan 4×15 minutes on temperature and RH of 52°C and 89%, and chemical accelerated aging conducted using the steam of 95% ethanol for 0, 1×20, 2×20, 3×20 dan 4×20 minutes on temperature and RH of 32°C and 82%. In terms of technical, procedure of chemical accelerated aging easier to do than with physical accelerated aging.
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Judul: Pemanfaatan Mesin Pengusangan Cepat (MPC IPB 77-1 MM) Menggunakan Etanol untuk Pendugaan Vigor Daya Simpan Benih Kedelai (Glycine max L. Merr.).
Abstrak: Accelerated Aging Machine (MPC IPB 77-1 MM) is a tool that can accelerate the deterioration of seed by using 96% ethanol vapor. Utilization of these machines are intended to be seen accelerated aging of seeds and comparing it with the natural deterioration during storage. This research aims to determine the suitability of loss of viability, vigor and increased electrical conductivity of soybean seeds that have accelerated aging using ethanol vapor compare to natural storage and estimate the vigor storability. The research consisted of two experiments is a natural storage and accelerated aging. Natural storage consists of 7 storage periods are 0, 1, 2, 3, 4, 5, 6 months and accelerated aging also consists of 7 periods are 0, 1x15, 2x15, 3x15, 4x15, 5x15 and 6x15 minutes. Results showed that the rate of decline suitability viability, vigor and an increase in electrical conductivity between natural storage with accelerated aging using ethanol vapor. MPC IPB 77-1 MM can estimate vigor storability of soybean seed on the benchmarks Germination (DB), Vigor Index (IV) and Speed Growth (KCT). KCT benchmarks more sensitive in predicting vigor storability, but a measure electrical conductivity is not sensitive in predicting vigor storability. Tanggamus and Wilis varieties have high vigor storability, while the varieties Kaba and Sinabung have lower vigor storability.
Keyword: MPC IPB 77-1 MM, vigor storability, electrical conductivity, deterioration

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