Judul: Respon Kualitas Pascapanen Bawang Merah (Allium ascalonicum L.) Terolah Minimal Pada Beberapa Suhu Penyimpanan.
Abstrak: Shallots are agricultural products that very important for Indonesian people. Nowdays, demand for ready to be processed vegetables and fruits are increased. Fresh and ready to be processed shallots are still not commonly found in the market. The purpose of this study was to analyze the quality change of the minimally processed shallots (Allium ascalonicum L.) stored at low temperature and determine the storaged time. The outer skin of the shallots were peeled and cleaned and then packed in styrofoam coated with food grade plastic films (plastic polymer). Shallots were stored at a temperature of 0 °C, 5 °C with RH 65-75 % and room temperature. The changes in quality parameters i.e water content, weight loss, thoughness, VRS levels and the percentage of damage were measured during storage period. The results showed that shallots stored at room temperature after two weeks storage due to moldy and rotten. The quality of shallots stored at temperature 0 °C showed better than quality of shallots at temperature 5 °C. Water content were fluctuated and tend to rise until the end of storaged time. Weight loss and damaged of shallots were increased until the end of storaged time. Firmness and VRS of shallots were decreased during storage.
Keyword: low temperature, minimal processed, shallots, storage

Judul: Penyimpanan Bibit Bawang Merah (Allium ascalonicum L.) pada Suhu Rendah dan Perlakuan Kadar Air Awal Untuk Mempertahankan Mutu
Abstrak: Bad post-harvest handling cause shallot damage and sprouting before the right time. Therefore the study of interaction initial moisture content and low temperature treatment is needed. The purpose of this research are to testing the effect of moisture content and low temperature of the damage and sprouting, and to knowing optimum moisture content and temperature to reduce the damage and sprouting. Methods of this research using some levels moisture content, there are ±85%, ±83%, dan ±81%, and then shallot seed stored at temperature 5°C and room temperature during 8 weeks. The result showed that interaction of moisture content and temperature had not significant effect on the sprouting, but significant effect on the damage. Optimum moisture content in the range of 80-85% can hold percentage of sprouting, but it cannot hold damage percentage. Percentage of damage is 19.8%. Temperature 5°C is the most optimal to reduce damage percentage, but the highest percentage of sprouting occurred at temperature 5°C. Percentage of sprouting is 4.8%.
Keyword: Bogor Agricultural University (IPB), shallot seed., moisture content, damage

Judul: Invers dari Matriks Tridiagonal Jacobi
Abstrak: Suatu matriks berukuran n×n dinamakan matriks tridiagonal jika untuk . Karya ilmiah ini memberikan algoritma yang mudah untuk menemukan invers ( dari matriks tridiagonal Jacobi yang simetrik dan nonsimetrik. Setiap elemen pada matriks tridiagonal ini adalah bilangan real. Terdapat 3 lema dan 2 teorema untuk menentukan . Lema pertama menunjukkan persamaan utama dalam membuktikan lema-lema dan teorema-teorema selanjutnya. Invers dari matriks yang simetrik dibuktikan oleh lema kedua yang menunjukkan elemen-elemen baris ke- dari . Selanjutnya, lema kedua dilengkapi dengan teorema pertama yang menunjukkan elemen-elemen dengan . Invers dari matriks yang nonsimetrik dibuktikan oleh lema ketiga yang menunjukkan elemen-elemen dengan dan elemen-elemen dengan dibuktikankan oleh teorema kedua.
Keyword: symmetric, nonsymmetric, matrix