Judul: Perubahan Karakteristik Fisikokimia Tepung Bawang Merah (Allium ascalonicum L.) dalam Kemasan selama Penyimpanan
Abstrak: The packaging has an important role to prevent and delay the decay of food. The used packaging will affect the chacteristic of packed shallot powder, the physically and chemically change is caused by chemical migration from packaging, aroma change, color change, and texture change due to water vapor and oxygen. These conducted research was designed to study and explore changes in physical dan chemical characteristics of shallot powder in packaging for storage in an effort to obtain a longer shelf life. Test parameters used in this study were color, water aktivity, moisture, ash content, concentration of total phenolics, and antioxidant activity. There were three conditions to store samples, i.e 20 oC, 30 oC, and 40 oC for 32 days. The results of this research of three packaging and temperature treatments during storage, has showed the increase and decrease of lowest slope on alumunium foil coated polypropylene vacuumed as parameters. iii On colorimetric measurement, water activity assay and water content assay showed the slope increase as 0.0942, 0.0042 and 0.0261 at temperature 20 oC, 30 oC, and 30 oC consecutively. The ash measurement, total phenolic concentration, antioxidant activity and inhibition precentation each has slope decrease as -0.0094, -4.2188, -0.9557 and -0.2924 on 30, 20, 30 and 30oC consecutively.
Keyword: Bogor Agricultural University (IPB), storage, shallot powder, packaging

Judul: Pengaruh Suhu dan Kemasan Terhadap Mutu Bibit Bawang Merah (Allium ascalonicum L.)
Abstrak: In storing of shallot seedbulbs, the damage because porous, disease, rooting and sprouting are often occur. The objective of this study was to determine the optimum temperature and packaging in order to maintain the qualities of shallot seedbulbs during the storing time. In this study, the packaging used is plastic net and polyethylene, stored at 10°C, 15°C, and room temperature. Parameters measured were weight loss, moisture content, hardness, damage, and sprouting. Room temperature could withstand the increasing of weight lost from week 2 to week 8 and temperature treatment could not withstand the decreasing of moisture content and hardness during the storing time. Storing at room temperature could withstand sprouting and damage of seedbulbs during the storing time. Plastic net packaging could withstand the increasing of weight loss at week 1 and week 2. Packaging treatment could not withstand the decreasing moisture content and hardness during the storing time. Polyethylene packaging could reduce damage during the storing time. Plastic net and polyethylene packaging could reduce sprouting during the storing time. Storing at room temperature with polyethylene packaging could reduce damage by 11.97% and sprouting by 0.004% during the storing time
Keyword: quality., packaging, temperature, shallot seedbulbs

Judul: igenvalues and Eigenvectors of Tridiagonal Matrix with Non Constant and Recurrent Diagonal Entries.
Abstrak: Matriks tridiagonal adalah suatu matriks yang mempunyai entri-entri bernilai nol kecuali pada diagonal utama, di bawah diagonal utama (subdiagonal) dan di atas diagonal utama (superdiagonal). Entri pada diagonal utama tidak konstan dan berulang. Setiap entri pada matriks tridiagonal ini adalah bilangan kompleks. Dalam karya ilmiah ini, akan dibuktikan 3 teorema untuk menentukan nilai eigen dengan 2 kasus dan 1 teorema untuk menentukan vektor eigen. Teorema pertama menentukan polinomial karakteristik dari matriks tridiagonal. Polinomial karakteristik dari matriks tridiagonal tersebut digunakan untuk menentukan nilai eigen pada teorema kedua dan ketiga serta menentukan vektor eigen pada teorema keempat
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