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 Mas (Cyprinus carpio) di Waduk Cirata
Abstrak: Cirata Reservoir was built with the main function as hydropower and for fisheries floating net cages (KJA). A large number of cages will increasing amount of feed and will impact the discharged waste into the waters of the reservoir. Wasted feed will increase the burden of sedimentation and improve water enrichment. Increased of enrichment can be seen from the loading of phosphor element. This study was conducted from January to March 2013. Species of fish that are reared Common carp (Cyprinus carpio) with the rear period for 4 months. The fish were fed with a pellet with 2:1 of FCR. The content of phosphorus in CF feed is 5.58% and at 3.38% for PL feed. The calculations showed that the amount of phosphorus loads from floating net cages for CF feed is 104.6 kg per ton of fish and for PL feed is 60.6 kg per ton of fish. If the common carp floating cages that fed by CF was added a second layer of tilapia net, it will release phosphorus 95.6 kg per ton of fish, whereas the PL of 51.6 kg per ton of fish. With the rear of tilapia in the second layer nets can reduce the release of phosphorus by 9%.
Keyword: Phosphorus loading., Floating net cages, Common carp

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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