Judul: Analisis Kandungan Nutrien (N, P) dan Pendugaan Status Kesuburan di Waduk Saguling, Jawa Barat
Abstrak: Saguling Reservoir is man made lake that stem the flow of Citarum River. It has a major function as a hydropower and fisheries activities supporting floating cage. Nutrien input from Citarum River and KJA potentially increase the trophic state of Saguling Reservoir. Research was conducted from November 2012 until January 2013. Sampling was done in 3 stations of Saguling Resevoir (inlet, middle, and outlet). Water quality parameters include physics, chemistry, and biology was observed in this research. Nutrien concentration was analyzed from N:P ratio. Trophic state was estimated from TSI. Ratio of N: P showed a value of 24.2 which means P is the limiting factor in Saguling Reservoir. The value of TSI showed hypertrophic condition but characteristic of hypertrophic didn’t show during observed in Saguling Reservoir.
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Judul: Kandungan Logam Berat Pb dan Cd pada Sedimen di Waduk Saguling, Bandung, Jawa Barat
Abstrak: Saguling Reservoir is a reservoir that received water flow from the Citarum River, which was pouled by many industrial wastes. These wastes contain heavy metals such as Pb and Cd that contaminated water, sediment and biota in the reservoir. The observation on the sediment, is expected to give a results about nominal level of the heavy metal pollution in that reservoir. The result showed that the content of heavy metal Pb and Cd was 8.623 ppm and 0.721 ppm. The value of both heavy metals at each station states that the levels of heavy metal pollution in sediments has exceeded the standard quality by EPA (1987) in the Laws (1993). In comparison with the content of heavy metals in water, sediment has a greater concentration with an average ratio of 11:1. Whereas v sediment in comparison with the content of heavy metals in Tutut, they have a smaller concentration values with an average ratio of 0.4:1. Distribution value of the heavy metal Pb and Cd in Saguling Reservoir have the same pattern, is high in inlet, and then decrease in the middle and increase surpass the inlet. The recommended supervision to reduce waste pollution in Saguling, is the implementation of the waste water treatment (IPAL) to industries that dispose their wastes to the water.
Keyword: Saguling Reservoir, Heavy metals, Pollution

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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