Judul: Pengusangan Cepat Fisik serta Penyimpanan Benih Koro Pedang (Canavalia ensiformis (L.) DC.) Menggunakan Ruang Simpan dan Kemasan Berbeda
Abstrak: Environment of storage conditions (temperature and RH) and type of packaging are important factors affecting seed storability. The aim of this research was to determine physical accelerated aging effect to jack bean seed viability and vigor, get the right storage room and pakaging materials to maintain seed viability and vigor during storage. The research consisted of 2 experiments. Experiment I using Randomize Complete Block Design (RKLT) with physical aging periods as a factor, which consisted of 0, 30, 60, 90, 120, 150, and 180 minutes aging periode. Seed was aged in high temperature (40 ºC) and high RH (>90%) using accelerated aging machine IPB 77-1 MMM type. Experiment II using a nested design with two factors. The first factor was storage room that consist of ambient storage condition and air-conditioned room. The second factor was packaging materials that consists of 3 levels i.e plastic bags, plastic jerrycans, and plastic polypropylene. The results of experiment I showed that phyisical accelerated aging with high temperature and humidity effectively decrease the viability and vigor as well as increase the moisture content of jack bean seed. Experiment 2 showed that the jack been seed storage in ambient storage condition produce higher moisture content, viability, and vigor than storage in air-conditioned room. Jack bean seed storage using plastic bags produce higher moisture content, viability, and vigor than storage using plastic jerrycans, and plastic polypropylene.
Keyword: Bogor Agricultural University (IPB), storage period, seed vigor, seed viability, seed moisture content, aging periods

Judul: Viabilitas Benih Koro Pedang Putih (Canavalia ensiformis (L).DC) yang Disimpan pada Beberapa Jenis Kemasan dan Periode Simpan
Abstrak: Jack bean belongs to the family of Leguminoceae and known as substitution plant for soybean because it has similar seed chemical composition with each other. The protein content in the seed made legume has low seed storability. The objectives of this research is to study the effect of packaging material and storage period on different room storage condition to viability of jack bean seed (Canavalia ensiformis (L.) DC.). This research used nested design with two factors. The first factor is packaging material and the second factor is storage period. Jack bean was packaged with four kinds of package (polyethylen plastic, flour sack, plastic sack, and bottle glass) and period of storaged up to six months in the AC and room storage condition. The results showed that polyethylen plastic and bottles glass was the best package for the jack bean seed storage during six months. Seed viability in both packaging was higher than flour sack and plastic sack for both room storage condition. This results showed that jack been seed could be storage in the AC and room storage condition more than six months.
Keyword: viability, storage, seed, leguminoceae

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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