Judul: Pelepasan Fosfor dari Keramba Jaring Apung Ikan Mas (Cyprinus carpio) di Waduk Cirata
Abstrak: Waduk Cirata dibangun dengan fungsi utama sebagai PLTA serta perikanan keramba jaring apung (KJA). Banyaknya jumlah keramba akan menyebabkan banyaknya pakan yang diberikan serta pakan yang terbuang ke perairan Waduk. Pakan yang terbuang akan menambah beban sedimentasi dan meningkatkan kesuburan perairan. Peningkatan kesuburan perairan dapat terlihat dari pelepasan unsur fosfor ke perairan. Penelitian dilakukan dari bulan Januari hingga Maret 2013. Jenis ikan yang dipelihara di keramba adalah ikan mas dengan masa pemeliharaan selama 4 bulan. Ikan diberi pakan berupa pelet dengan FCR 2:1. Kandungan fosfor pada pakan CF adalah 5.58% dan pada pakan PL sebesar 3.38%. Beban jumlah fosfor yang dikeluarkan dari keramba jaring apung ikan mas untuk pakan CF adalah sebesar 104.6 kg per ton ikan dan untuk pakan PL sebesar 60,6 kg per ton ikan. Apabila keramba jaring apung ikan mas yang diberi pakan CF dan ditambahkan jaring lapis kedua berisi ikan nila, fosfor yang dilepas ke perairan adalah sebesar 95.6 kg per ton ikan sedangkan untuk pakan PL adalah sebesar 51.6 kg per ton ikan. Dengan adanya pemeliharaan ikan nila di jaring lapis kedua dapat menurunkan pelepasan fosfor sebesar 9 %.
Keyword: Common carp, Floating net cages, Phosphorus loading

Judul: Pelepasan Fosfor dari Keramba Jaring Apung Ikan Bawal (Colosomma macropomum) di Waduk Cirata.
Abstrak: Waduk Cirata start to functioned for fishery of floating net cages activity since 1988. One of the main commodities at Waduk Cirata is Black Prompet. It is one of the most fish to consume. Feeding with high Food Conversion Ratio (FCR) lead to high residual feed that accumulated at the base. Moreoverthe content of Phospor (P) at artificial feed was high enough to affect the height of the element P to waters causing eutrophication. This research aimed to estimate the total of P content from Black Pomfret’s floating net cages to environment and to estimate the optimal of carrying capacity at Waduk Cirata for the development of floating net cages to eco-friendly. This research was conducted in Waduk Cirata, West Java from January to March 2013. The release of total P was use JT’s feed is 12.95-12.93% of the weight of the fish and the feed given during maintenance while the SP’s feed is 6.24-6.58% of the weight of the fish and the feed given during maintenance. Carrying capacity was increased when using a feed with a low content of total P. Carrying capacity was obtained using JT’s feed, use 1 layer of net are 18 447 tonnes of fish/ growing season (18 400 plots KJA) while the 2 layer nets are 18 945 tonnes of fish/growing season (18 900 plots KJA).
Keyword: Loading Fosfor., Floating Net Cage, Black Pomfret

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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