Judul: Efektivitas Penambahan Zeolit 20 g/ℓ, Karbon Aktif 10 g/ℓ dan Garam 5 g/ℓ dalam Transportasi Tertutup Benih Ikan Gurame Osphronemus goramy Lac dengan Kepadatan Berbeda
Abstrak: Giant Gouramy is one of leading commodity Kementerian Kelautan dan Perikanan Republik Indonesia with production increase until 8,8% per year. Problem who often faced by Indonesian farmer in giant gouramy seed delivery is low survival rate due to the water quality change during transportation. One attempt was made to neutralize the ammonia is by adding zeolite and activated carbon in the transportation medium. Transportation carried out for 96 hour, then fish maintained for 14 days. This reaserch used giant gouramy seed size 3 cm with different density 45, 50, 75 and 100 giant gouramy seed/ℓ, zeolite added 20 g/ℓ, actived carbon 10 g/ℓ and salt 5 g/ℓ. The result showed treatment with density 75 carp seed/ℓ better than other treatment. It also showed by the value of the water quality that better than the other treatment. TAN 4,08±4,33 mg/ℓ, DO 4,4 mg/ℓ support the high survival rate 70,67%. Value of post transportation survival maintainance 100%, with growth rate 9,21% daily weight and income Rp 8.957.200.
Keyword: giant gouramy, zeolite, activated carbon, survival rate, Fish transportation

Judul: Efektivitas penambahan zeolit 20g/ℓ, karbon aktif 10g/ℓ, dan garam dalam transportasi tertutup benih ikan gurame osphonemus gouramy Lac. dengan kepadatan tinggi
Abstrak: Fish transportation was usually held at high density to efficient the transportation cost, but Higher density of fish carried inside the container will be increase stress level of fish. Some stress will result in increased activity of fish physycology that could worst the water quality especially DO, CO2, and NH3. This research aimed to evaluate the effectifity of salt utilization in water transport media which had been given by zeolite and active carbon to maintain water quality of transport media, so the mortality during transportation of gouramy fish size ±4 cm can can be minimize during transportation. The research was conducted in laboratory scale with complete randome device. Gouramy fish Osprhonemus gouramy which use for this experiment were exsposed to five different doses and applied in two replications. Every treatment was describe A)blanko 50 fishes/ℓ (without zeolite, active carbon, and salt); B)control 50 fishes/ℓ + 20 g/ℓ zeolite + 10 g/ℓ active carbon; C) 50 fishes/ℓ + 20 g/ℓ zeolite + 10 g/ℓ actvive carbon, 1 g/ ℓ salt; D) 50 fishes/ℓ + 20 g/ℓ zeolite + 10 g/ℓ active carbon, 3 g/ℓ salt; and E) 50 fishes/ℓ + 20 g/ℓ zeolite + 10 g/ℓ active carbon, 5 g/ℓ salt. The package system was transported for 72 hour. Survival rate during transportation in every treatment A, B, C, D, and E was 0%, 57%, 59%, 65%, dan 74%. The result of this research showed that treatment E gave the best result seen from the survival rate (SR) with 74 %, associated with the transport medium water quality values had level of total amonia nitrogen (TAN) 1.619±0.28, NH3 0.069±0.016, DO 4,26 mg/ℓ and has the best specific growth rate 2.95%, and 100% of survival rate during post-transportation test.
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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