Judul: Pengaruh Jenis Kemasan Dan Suhu Penyimpanan Terhadap Kesegaran Dan Kualitas Buah Salak Padangsidimpuan (Salacca sumatrana)
Abstrak: This study aims to obtain the storage temperature and type of packaging which suitable for salak Padangsidimpuan. The research was conducted in two stages, i.e. preliminary research and primary research. Preliminary research carried out by measuring the initial quality (total weight lose, perishable fruit, water content, total titrated acid, total soluble solids, vitamin C and organoleptic). The results and than are used as initial data to conduct primary research. Primary research was conducted by coated 1 kg of salak and then packed with cartons, bamboo basket, plastic PE with cartons and plastic PE with bamboo basket. All samples were storaged in at 15oC and room temperature. Salak without treatment was also stored at room temperature as a control. Samples were analyzed the qualities every three days. Based on this research, physico-chemical characteristic of salak Padangsidimpuan showed that the water content was 78.12%, total titrated acid was 6.34%, total soluble solids was 15oBrix, vitamin C was 1.87 mg/100 g fruit, the preference score for color was 4, aroma was 4, flavor was 3, texture was 3 and general acceptance was 3. Based on the ANOVA analysis, Duncan test and “t” test, can be concluded that salak Padangsidimpuan were stored at a temperature of 15oC hold maximum of 30 days, with cartons, bamboo basket, plastic PE with cartons and plastic PE with bamboo basket. However the best condition of packaging resulted from this research was bamboo basket in 15oC.
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Judul: Pengaruh Kemasan dan Suhu Penyimpanan terhadap Mutu Buah Salak Pondoh (Salacca edulis R) setelah Transportasi
Abstrak: Snake fruit is Indonesia original fruit which has the potential to be developed become export commodity. The problems which there is the packs still traditional, so be needed study about using packs which many used to export market, such as cardboard boxes and plastic buckets. The general purpose this research is to inspect using plastic buckets, cardboard boxes and bamboo baskets for snake fruit distribution. At the beginning of the research, all of the packs have done a transport of simulation on the vibrating table. Then, the packaged was stored at room temperature and 10° C. During storage carried out an observation of mechanical damage, physiological damage, hardness, weights shrinkage, water content, total of dissolved solids, and organoleptic tests. After the simulation of transportation, mechanical damage that occurs is 0% (plastic baskets), 0% (cardboard boxes), and 3.44% (bamboo basket). The results also indicate that changes of the quality that occur in the fruits is hardness and total of dissolved solids are decreased while weights shrinkage and water content have increased. Overall, physiological damage up to 10 days at room temperature is 64.31% (plastic buckets), 68.99% (cardboard box), and 71.08% (bamboo basket), while the physiological damage up to 20 days at 10° C is 39.58% (plastic buckets), 25.26% (cardboard box), and 29.87% (bamboo basket). In organoleptic test showed that of all the parameters tend to decrease, except the fruit taste has increased at room temperature. Based on this research can be concluded that the packaging is good for the quality of snake fruits is cardboard box with the temperature is 10° C.
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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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