Judul: Kajian pelapisan dan suhu penyimpanan untuk mencegah busuk buah pada salak pondoh (Salacca edulis reinw.)
Abstrak: Snake fruit or salacca is a kind of perishable fruit. At room temperature, fresh salacca is only able to be stored less than 12 days. The mechanism of fruit rot during storage was influenced by mechanical, physiological and microbiological factors that result browning discoloration on the fruit flesh, wrinkled, dry and moldy. The aim of this research are: (1) to investigate the kinds of fruit rot on postharvest of salak pondoh; (2) to study the effect of coating of fruit and storage temperature on salak pondoh quality, and (3) to correlate the quality change of salak and mold growth during storage.The result of the research showed, the fungus occurred in fruit rot were mucor sp, aspergillus sp, fusarium sp and penicillium sp. Fresh fruit coating using aloevera and temperature treatment during storage had significant influence on quality changes including weight loss, flesh and skin water content, total soluble solid, firmness and sensory value. Due to prevention of fruit rot, Aloe vera coating was able to inhibit mold growth for 27 days during storage.
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Judul: Pengaruh Pelilinan pada Ujung Buah Salak Pondoh Pascapanen dengan suhu yang berbeda terhadap Investasi Penyakit
Abstrak: Salacca fruits (Salacca edulis R.) pondoh variety is one of the special horticultural product of Indonesia with relatively high productivity. This product become more popular for domestic and international consumers, so that will be one of the main tropical export of Indonesia. However, there are still many problems related with post harvest handling of salacca, especially fungus attack at the end-port of fruits that cause changes its smell, taste and texture, that will cause shorter their self life. From preliminary research was found that damage of the sample from traditional market was 16.17 %/day with shelf life until 6 days, whereas the sample from modern market had lower damage percentage (13.86 %/day) and could be remain good until day-7. Addressing these results, then continued by research, using samples that were treated by several consentrations of waxing, i.e. 8, 10, and 12% and without waxing as a control, then stored at 10°C and 20°C, respectively. The aim of this research was to investigate the effectiveness of bee wax emulsion on the growth of deaseas at the egde of Pondoh sallaca under various storage temperatures. The result showed that the storage at 10°C could decrease the respiration rate compared with at 20°C, and consentration at 8% produced the lowest rate of respiration (2.45 ml/kg.hour of O2, and 5.61 ml/kg/hour of CO2). From the organoleptic measurement, combination of 8% of wax concentration and temperature 10°C was accepted by panelists until day-30, where as control sample at temperature of 10°C were rejected by 23 days after storage. From the result of this research result, can be recommended that combination 8% of wax concentration and storage temperature 10°C was the best condition to prevent rotten of the edge of Pondoh salacca fruit.
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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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