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: Invers Drazin dari Matriks Toeplitz Singular
Abstrak: Matriks Toeplitz adalah matriks yang setiap unsur pada diagonal utama bernilai sama dan setiap unsur pada subdiagonal yang bersesuaian dengan diagonal utama juga bernilai sama. Matriks singular adalah matriks yang tidak bisa ditentukan inversnya. Akan tetapi, dapat diupayakan untuk ditentukan inversnya menggunakan invers matriks yang diperumum. Invers Drazin merupakan salah satu jenis invers matriks yang diperumum. Pada karya ilmiah ini ditentukan invers Drazin dari matriks Toeplitz singular dengan menggunakan metode Leverrier Faddeev. Kemudian, ditentukan invers Drazin dari matriks Toeplitz singular yang direpresentasikan sebagai penjumlahan segitiga bawah dan segitiga atas matriks Toeplitz berdasar pada teorema Gohberg dan Semencul., Toeplitz matrix is a matrix in with element on the main diagonal has the same value and on the subdiagonal corresponding to the main diagonal also has the same value. Singular matrix is a matrix that has no inverse. However, it can be attempted to determine the inverse using a generalized inverse matrix. Inverse Drazin is a type of generalized matrix inverse. This paper discussed the inverse Drazin for a singular Toeplitz matrix using the Leverrier Faddeev method. Then, the Drazin inverse of the singular Toeplitz matrix which is represented as a sum of products of lower and upper triangular Toeplitz matrix based on Gohberg and Semencul theorem.
Keyword: inverse Drazine, singular Toeplitz matrix