Judul: Manufacture of dried strawberry (Fragaria sp)and quality changes during storage
Abstrak: Strawberries are one of the fruits are perishable, this is because the smooth texture of strawberry skin’s so easily scratched and then it will decay, apart from that the water content in strawberries is very high. So that needs to be done to improve the shelf life handling of fruit, one of the means used for curing is the drying of fruit. Dried Strawberries are one of the processed products are preferred by consumers, this is because the strawberries that have a sour taste will be reduced due to the addition of sugar during the drying process. In addition it will be more chewy texture of the fruit because decrease water content in strawberries. Making dried strawberries has two factors that influence the concentration of preservatives and long soaking the fruit in sugar solution. Preservatives used in the manufacture of dried strawberries is sodium metabisulfite. The selection of sodium metabisulfite is because compared with other sulfite compounds, sodium metabisulfite most stable. In addition sulfite salt is a material that is not harmful to the body, because these compounds can be oxidized to sulfate which can be excreted with urine. From the results of preference tests with three parameters: taste, color, and texture of the resulting rank of 30 panelists most preferred is the interaction between sodium metabisulfite 300 ppm and 72 hours immersion. Test the quality changes during the four weeks that the water content of the above also shows that the interaction does not change significantly.
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Judul: Kajian Teknik Penyimpanan dan Pengemasan Buah Stroberi (Fragaria chiloensis L.) Selama Transportasi
Abstrak: Strawberry is one of the horticultural commodity that has a great potential to be developed commercially. Packaging is the most important method to keep strawberry still maintained in the best quality. Filler material that will be used to package the strawberry was studied in this research to maintain the fruits quality during transportation and storage. Oso grande strawberry cultivar is being used that have characteristics such as: very large size, dense fruit, the texture in the middle of fruit looks like the foam, and high yields. During transportation and storage the packages produce faces numerous hazards, these may be mechanical, environmental, or biological. Mechanical hazards can be defined as those caused by impact, vibration,compression and puncturing. This research studied how interaction the filler with fruits and kinds of compiling strawberry to keep the quality of strawberry fruits during simulation transportation. The purpose of this research are to determine the filling material quality that can maintain the quality of strawberry and to research the effect of mechanical damage on strawberry packaging filler material also to determine the effect of mechanical damage on strawberry. After the packaging, the strawberry fruits do simulation transportation with vibration table during 2 hours with the amplitude 3.63 cm and frekuensi 3.12 Hz. Then the strawberry fruits have storage at 10oC. The test method that being used are biological and mechanical damage testing, fruit weight loss, fruit hardness, and total solids that being dissolved. Fruit mechanical damage can be seen from the number of bruises along the outer side of strawberry fruit, then for biological damage can bee seen from white spotted that seems like fungi that come from strawberry fruit. Fruit hardness or sugar content inside the strawberry can be tested on upper side, middle side and bottom side of the strawberry. The results from the experiment can be concluded that by using styrofoam as material packaging with a horizontal position can maintain the quality of strawberry fruit rather than the other method.
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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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