Judul: Kajian Kandungan Logam Berat Timbal (Pb) dan Merkuri (Hg) Pada Air dan Ikan Budidaya Keramba Jaring Apung (KJA) di Waduk Cirata- Jawa Barat
Abstrak: The study was conducted at Cirata reservoir from November 2007 to April 2008. The objective of the study was to analysis timbal (Pb) and mercury (Rg) content both in the water, Common Carp and Oreochromis niloticus liver and flesh and analysis histology. Survey method was used at 3 locations I.e. 1) Citarum basin 2) Cisokan basin and 3) Dangerous zone far floating net cage fish culture activity. Fish~ples were taken from every locations with 3 different age (1, 3 and 5 ) months.The result showed that minimum and maximum values at 2 and 5 m water depth-6for timbal on station two and station one . The minimum values for mercury (Rg) ~n station two and station three and maximum values on station one. Timbal (Pb) ~est concentration inside Common Carp and Oreochromis niloticus liver on statio~ two , where as highest concentration on station three, There are timbal (Pb)inside-xt:'ommon Carp and Oreochromis niloticus flesh, found at the age of disperse 5 mont( with lowest concentration at station two, by concentration 0,00011 mg/kg of Com~n Carp and 0,00016 mg/kg of Oreochromis niloticus body weight respeijively. There are mercury inside Common Carp and Oreochromis niloticus liver!! and 5 months age of disperse, where as mercury not existed in flesh. Age III Influence to timbal concentration Common Carp and Oreochromis niloticus liver at III eve~ station showed significant at level p < 0.05, whereas mercury showed OJ signi~ant of Common Carp liver on station 3. Histological observation showed that there§'-ere necrosis in Common carp and Oreochromis niloticus liver and fish flesh. Keywords :timbal (Pb), mercwy (Hg),water, liverandfishflesh
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Judul: Kajian Kandungan Logam Berat Timbal (Pb) Dan Seng (Zn) Pada Air, Sedimen, Dan Makrozoobentos Di Perairan Waduk Cirata,Provinsi Jawa Barat
Abstrak: Logam berat merupakan unsur kimia yang dianggap sebagai penyebab pencemaran air dan dapat membahayakan kehidupan organisme serta efeknya secara tidak langsung dapat merugikan kesehatan manusia. Penelitian ini dilakukan di perairan Waduk Cirata, Provinsi Jawa Barat dengan tujuan mengkaji kandungan logam Pb dan Zn dalam air, sedimen, dan makrozoobentos. Analisis data mengacu pada Peraturan Pemerintah No. 82 Tahun 2001 and analisis regresi dan korelasi untuk mengetahui keeratan hubungan antar parameter yang diukur. Metode yang digunakan adalah Standar Nasional Indonesia (SNI) dengan menggunakan Atomic Absorption Spectrofotometer (AAS). Hasil analisis laboratorium diperoleh rata-rata kandungan logam Pb di air sebesar 0,01-0,0213 mg/l, Zn 0,036-0,067 mg/l, kadar amonia 0,36-0,616 mg/l, nitrat 0,0914-0,57 mg/l, nitrit 0,02-0,067 mg/l, sedangkan sedimen Pb sebesar 20,5-39,4 mg/kg dan Zn 73,34-111 mg/kg, makrozoobentos Pb 31,62-43,65 mg/kg dan Zn 11,79-17,85 mg/kg, dimana Logam Zn dan ammonia tidak memenuhi baku mutu air (PP.No. 82 Tahun 2001). Hasil analisis komposisi relatif makrozoobentos, yaitu; kelas Gastropoda 38 %, Oligochaeta, Diftera dan Odonata 14 %, Pelecypoda 10 %, kelas Coleoptera dan Lepidoptera 5 % dan rata-rata kepadatan berkisar antara 65,4-325,4 (indiv/m2), indeks keanekaragaman (H|)1,18-1,83, keseragaman (E) 0,527-0,683, dan dominansi (C) 0,363-0,58. Hasil analisis korelasi dan regresi menunjukkan bahwa hanya logam berat Pb yang memiliki hubungan erat, yaitu: kandungan logam berat dalam air dengan sedimen, air dengan makrozoobentos, dan sedimen dengan makrozoobentos.
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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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