Judul: Respon Fisiologi Benih Ikan Patin (Pangasius hypopthalmus) pada Pengangkutan Sistem Tertutup dengan Pemberian Zeolit, Arang Aktif dan Minyak Cengkeh
Abstrak: The objective of this research was to determine the effect of zeolit, activated charcoal and clove oil in maintaining water quality in the transport media and minimizing the stress level of Pangasius hypopthalmus juvenile. This research consisted of 6 treatments and 3 replications. Each treatments were; B). 20 g of zeolite + 10 g of activated charcoal; C). 20 g of zeolite + 10 g of activated charcoal + 3 ppm of clove oil; D). 20 g of zeolite + 10 g of activated charcoal + 6 ppm of clove oil; E). 20 g of zeolite + 10 g of activated charcoal + 9 ppm of clove oil; F). 20 g of zeolite + 10 g of activated charcoal + 12 ppm of clove oil, and A as a control (without zeolite, activated charcoal and clove oil). The duration of this research was 72 hours. The result showed that treatment E gave the best result among them. It was indicated by 5,348 ± 0,02 mg/L TAN (Total Ammonia Nitrogen) concentration, 50,42 mg/L CO2, 14,1 ng/ml of cortisol concentration, 1,56 (106×sel/mm3) erythrocyte, 6,52 (104×sel/mm3) leukocyte, 5,5±0,3 gr/100ml hemoglobin, 36,51±0,15 % hematocrit, 83,11% of survival rate. That treatment also showed the fewest of the gill histopathological changes and also showed the best spesific growth rate ( 1,035% of body weight/day).
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Judul: Efektifitas Penambahan Zeolit dan Karbon Aktif Terhadap Kelangsungan Hidup Benih Ikan Patin Pangasionodon sp. Pada pengangkutan Sistem Tertutup
Abstrak: The problem often faced by Indonesian farmers in striped catfish (Pangasionodon sp) fry transportation is low survival rate due to changes in water quality during transportation caused by high consentration of CO2, ammonia accumulation, fish activity, bacterial infection and physical wound from rough handling. An attempt done to neutralize toxic ammonia that is by adding zeolite and active carbon to packing medium, where the zeolites and activated carbon is a material capable of adsorbing ammonia for a certain time. This research used zeolite and carbon composition A (20 g zeolite), B (15 g zeolite + 5 g activated carbon), C (10 g zeolite + 10 g activated carbon), D (5 g zeolite + 15 g activated carbon) and E (20 g activated carbon). Fish density used 300 fry/ℓ for 72 hours every 24 hours samples were taken to measure water quality (DO, TAN, NH3, pH, temperature, CO2). This research resulted thst 5 g zeolite + 15 g activated carbon addition gave the best results with the highest survival rate of 83.3 ± 6.79%, TAN concentration of 4.6816 ± 0.628 mg / ℓ and NH3 concentration of 0.0228 ± 0.005 mg / ℓ, the temperature of 19.7 to 22 ° C, DO of ± 1.99 mgO2, CO2 sebesar 62,84± 5,53 mg/ℓ.
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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