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: Penggunaan Kitosan dan Kemasan Plastik Film untuk Memperpanjang Masa Simpan Salak Pondoh.
Abstrak: Snake fruit is a tropical fruit which easily damaged during transportation and storage. The main causes of damage were due to mechanical impact, respiration and fungal microbe infection. The purpose of this research was to analyze the effect of chitosan coating and plastic film on shelf-life of snake fruit var. pondoh during storage. Snake fruit var. pondoh was harvested at farmer orchards in Sleman with condition of 80 percent maturity level. After the harvesting stage, sample of fruit were cleaned and sorted. Snake fruit samples were transported to the packing house in Semarang. Snake fruit samples were then coated by solution with concentration of 0.5 % chitosan substance. Sample of fruits were packed with three different packaging materials. The packaging materials were polypropylene plastic, polyethylene plastic and white stretch film the weight of each packed was 500 grams. Sample of fruits were transported to laboratory at ambient temperature condition for 24 hours. After arriving at laboratory fruits were stored at 15oC and ambient temperature. The parameters of quality in this research were weight loss, water content, total soluble solids, firmness value and organoleptic. The results showed the polyethylene has maximum shelf-life up to 24 days at temperature 15oC. Plastic packaging at room temperature has shelf-life up to 9 days of storage. The fruits that stored at room temperature without treatment it was observed that fruits over-ripe at 6 days and the fruits that stored at 15oC without packaging was in good conditions up to 18 days.
Keyword: Bogor Agricultural University (IPB), shelf-life., packaging, plastic film, natural coating agent, snake fruits var. pondoh, chitosan

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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