Judul: Kombinasi Cacing Sutra Tubifex dan Pakan Buatan pada Pemeliharaan Larva Ikan Patin Pangasius sp.
Abstrak: This research was conducted to evaluate the effect of different combination of feeding frequency of Tubifex (C) and artificial diet (P) on survival rate and growth rate of larval yellowtail catfish Pangasius sp.. Newly hatched larvae (d0) with total length of 0.44±0.04 cm were cultured for 14 days in 30x20x20 cm3 aquarium. Water volume in each aquarium was 9 L. At d5, larvae were fed on five different feeding frequencies either 6C+0PB, 5C+2PB, 3C+3PB, 2C+5PB, dan 0C+6PB. Feeding method used in this research was ad libitum. Results showed that survival rate and total length of d14 old larvae fed on 0C+6PB was lower than the groups fed on either 6C+0PB or three combinations of C+PB. Lipase activity tend to be increase in line with the increasing amount of artificial feed. On the other hand, larvae fed on 6C+0PB and 0C+6PB had the lowest protease activity. Therefore, larval catfish can be fed by combination of Tubifex and artificial feed.
Keyword: yellowtail catfish larva Pangasius sp., silkworm, protease activity, lipase activity, Artificial diet

Judul: Pemberian Pakan Campuran pada Larva Ikan Patin
Abstrak: Artemia as live feed of stripped catfish larvae has a high price and tend to increase in time. The objective of this research is to find out the most optimum combination of artemia and compound feeding for stripped catfish larva survival and growth. Five thousand catfish larvae were stocked in glass aquarium with the size 90x40x40 cm3 and 50 larvae in glass aquarium 20x10x15 cm3. Combination feeding experiment consisted of 77.19 g artemia as a control; 77.19 g of artemia and 27 mL of compound feed (treatment I); 57.89 g of artemia and 33.75 mL of compound feed (treatment II); and 38.59 g of artemia and 40.5 mL of compound feed (treatment III). Survival rate of larvae on day 3th was 71.67%; 60.00%; 65.00%; and 31.25% respectively. While larva survival on 18 days was 50.27%; 34.50%; 53.33%; and 31.23% respectively. During the three days of experiment on survival, treatment III showed significanly lower survival. Absolute larvae length on 3 days experiment was 0.69 cm; 0.70 cm; 0.64 cm; and 0.59 cm respectively. Absolute larvae length the treatment was not significanly diffirent from each other, except for treatment III. Absolute larvae length in 18 days experiment was 1.52 cm; 1.40 cm; 1.51 cm; and 1.42 cm respectively. Combination of artemia and compound feed had an effect on survival rate. Compound feed could not totally replace artemia as a live feed, however it can be used as a complement feed.
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Judul: igenvalues and Eigenvectors of Tridiagonal Matrix with Non Constant and Recurrent Diagonal Entries.
Abstrak: Matriks tridiagonal adalah suatu matriks yang mempunyai entri-entri bernilai nol kecuali pada diagonal utama, di bawah diagonal utama (subdiagonal) dan di atas diagonal utama (superdiagonal). Entri pada diagonal utama tidak konstan dan berulang. Setiap entri pada matriks tridiagonal ini adalah bilangan kompleks. Dalam karya ilmiah ini, akan dibuktikan 3 teorema untuk menentukan nilai eigen dengan 2 kasus dan 1 teorema untuk menentukan vektor eigen. Teorema pertama menentukan polinomial karakteristik dari matriks tridiagonal. Polinomial karakteristik dari matriks tridiagonal tersebut digunakan untuk menentukan nilai eigen pada teorema kedua dan ketiga serta menentukan vektor eigen pada teorema keempat
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