Judul: Growth Performance of Synodontis eupterus in Preservation Media with Salinity
Abstrak: Good environmental condition supported by sufficient feeding and provision of good container with optimum salinity can increase the production output. This research aimed to obtain information about the relationship of salinity with growth of sinodontis. The fry that used have average length of 3,41+0,04 cm with average weight of 0,60+0,02 g which comes from Cibinong, West Java. The fry first adapted into aquarium and next treated on 0, 2, 4 and 6 treatment with 3 repetitions. Containers used for the treatment are 12 aquariums which have dimension of 30x25x25 cm3. Each one is filled with 15 liters of water. The length of time for the development of the fish is 28 days. During the period of time, the fish were fed with silkworm twice a day in the morning and in the afternoon in at satiation. Water replacement is 75% volume per day. Salinity treatment significantly affects (P<0,05) length growth rate (LPP), weight growth rate (SGR), and feed efficiency (EP). Treatment with 2 ppt salinity showed the best production performance.
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Judul: Pertumbuhan dan kelangsungan hidup benih ikan Sinodontis Synodontis eupterus pada kepadatan yang berbeda
Abstrak: In a good environmental condition and adequate quantity of food, an increase of stocking density will increase yield. This experiment was aimed to obtain information about the most optimum stocking density of sinodontis nursery culture. The initial size of sinodontis fry was 2,54+0,11 cm in length and 2,97+0,43 g in weight, which was obtained from a sinodontis farmer at Pagelaran, Bogor, West Java. Prior to experiment, the fry was adapted in the aquaria with a size of 60x29x33 cm which had been filled with 20 ℓ of water. The fry was then cultured at 3 different stocking density treatments. 3, 6, 9 fry/ℓ with 3 replications for a period of 40 days. The fry fed a Limnodrilus sp. twice a day at satiation. Substitution of water exchanged twice a day in the morning and on the afternoon with a rate of 2x30% a day. The result indicated that stocking density did not significantly affected fish survival, specific grow rate, growth of absolute length and coefficient of variation (p>0.05). But when viewed from the economic efficiency, density of 9 fry/ℓ give the best results with the R/C ratio is greatest.
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Judul: Invers dari Matriks Tridiagonal Jacobi
Abstrak: Suatu matriks berukuran n×n dinamakan matriks tridiagonal jika untuk . Karya ilmiah ini memberikan algoritma yang mudah untuk menemukan invers ( dari matriks tridiagonal Jacobi yang simetrik dan nonsimetrik. Setiap elemen pada matriks tridiagonal ini adalah bilangan real. Terdapat 3 lema dan 2 teorema untuk menentukan . Lema pertama menunjukkan persamaan utama dalam membuktikan lema-lema dan teorema-teorema selanjutnya. Invers dari matriks yang simetrik dibuktikan oleh lema kedua yang menunjukkan elemen-elemen baris ke- dari . Selanjutnya, lema kedua dilengkapi dengan teorema pertama yang menunjukkan elemen-elemen dengan . Invers dari matriks yang nonsimetrik dibuktikan oleh lema ketiga yang menunjukkan elemen-elemen dengan dan elemen-elemen dengan dibuktikankan oleh teorema kedua.
Keyword: symmetric, nonsymmetric, matrix