Judul: Formulasi minuman fungsional kerang pisau (Solen spp)
Abstrak: Razor clam (Solen spp) is one type of a class of mollusks that includesbivalva Pelecypoda or non-fish aquatic biota. Razor clam have the opportunity to be used as a health beverage because it contains taurine and has an antioxidant activity. The aim of the study were to determine the effect of concentration and the mixing of the raw materials to the antioxidant activity in fungtional beverages and determine the maximum storage by testing the stability of the product. The result were three formultion, A131 formula (Solen spp 35%, ginger 40%, tamarind 15%, lemon 10%), A132 formula (Solen spp 40%, ginger 40%, tamarind 10%, lemon 10%), A133 formula (Solen spp 45%, ginger 40%, tamarind 5%, lemon 10%).Addition of razor clam, ginger, tamarind and lemon in formulation will provide a synergistic effect on antioxidant activity. Panelist preferred formula based on taste and has the best antioxidant activity (1.107,08 ppm) was the formula A131. Functional beverage powder storage for 60 days can reduce the antioxidant activity in functional beverage products to 8,7%. The testing stability of the parameters showed chemical and microbiological shelf life astimation based on the critical parameters of the mold, formula A131 has a shelf life over 94 days at 30⁰C.
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Judul: Efek Sinergis Taurin Lintah Laut (Discodoris sp.) dan Temulawak (Curcuma xanthorriza Roxb.) dalam Serbuk Minuman Fungsional
Abstrak: Aquatic resources such as sea slug (Discodoris sp.) can be made into functional beverages. Sea slug has been reported to possess antioxidant properties which allege that the functional drink made from sea slug contains taurine. The study was conducted into 3 phases: 1 )preparation of raw materials (Discodoris sp.) 2) preparation of additional ingredients (ginger, curcuma and lemon) 3) formulation of the functional beverage product. The aim of the study were 1) to determine the concentration of raw materials composition by considering the synergistic effect of taurine on the functional beverage, 2)to determine the effect of the preparation of functional beverage powders on total taurine, 3)to determine the effect of storage on taurine content functional beverage powders sea slug. Three best formula which physically acceptable:T1 formula (Discodoris sp. 20%, ginger 40%, curcuma 20%, lemon 20%),T2 Formula (Discodoris sp. 25%, ginger 40%, curcuma 15%, lemon 20%), and T3 Formula (Discodoris sp. 30%, ginger 40%, curcuma 10%, lemon 20%). Addition of sea slug, ginger, curcuma and lemon in formulation caused a synergistic effect on taurine content. The length of storage decreased the amount of taurine in the functional beverage powders sea slug.
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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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