Judul: Pengaruh Iradiasi dan Suhu Terhadap Perubahan Kesegaran Cabai Merah (Capsicum annum L.) Selama Penyimpanan
Abstrak: Red chili (Capsicum annum L.), a perishable horticultural products, is one of the widely used food flavourings. Therefore, the application of suitable postharvest technologies to maintain quality is required. The aim of this research is the effects of different irradiation dose (0, 500 and 1000 gray) and storage temperature (10 oC and 30 oC) on red chili quality and shelf life. Results showed that the irradiation dose at 500 and 1000 gray did not affect weight loss, color, texture of chili during storage. It is justifiable to use the irradiation dose below 500 gray for future research.
Keyword: red chili, quality, shelf life, storage, irradiation

Judul: Kajian Penggunaan Bahan Pengemas Kardus dan Plastik Berventilasi pada Penyimpanan Cabai Merah (Capsicum annuum L.) Segar
Abstrak: The effect of packaging materials and temperature of storage on quality of fresh chili (Capsicum annuum L.) was observed in this study. Samples of chili were harvested from farmer’s orchad in chili production areas in Lembang, West Java. The study was caried out using the ventilated cardboard and plastic for chili’s packaging stored in 15oC and room temperature. Weight loss, moisture content, firmness, colour, and respiration rate of all samples were measured during storage period. The result showed that packaging material had significant effect on weight loss, moisture content, value of a (chromatic red-green color) and b (chromatic blue-yellow color). The packaging material had no significant effect on hardness and value of L (brightness). Temperature of storage had significant effect on weight loss, moisture content, firmness, value of L, a, and b. The packaging of fresh chili using ventilated cardboard and room temperature preserved the best quality of colour up to 10 days. It was concluded that ventilated plastic and temperature of 15oC resulted the best quality of fresh chili up to 20 days.
Keyword: quality of chili, temperature of storage, packaging material, fresh chili

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