Judul: The efficiency of transport of fish seed Maanvis (Pterophyllum scalare) with the addition of 20 grams of zeolite / L, 10 grams of activated carbon,and salt 4 ppt with a density of 40 fish / L
Abstrak: Pada transportasi benih ikan, kepadatan merupakan faktor pembatasnya sehingga untuk meminimalisir kematian saat transportasi benih perlu dilakukan pengurangan kepadatan. Penelitian ini bertujuan untuk mengetahui efektivitas dari penambahan zeolit 20 gram/liter, karbon aktif 10 gram/liter, dan garam 4 ppt pada kemasan transportasi ikan Maanvish ukuran M (Panjang baku = 2-3 cm) dengan kepadatan 40 ekor/liter. Penelitian ini dimulai dengan mengukur kualitas air pada sumber air transportasi, memuasakan ikan sebelum dikemas, dan mengukur kualitas air setelah digunakan sebagai media transportasi benih ikan Maanvis ke Bali serta menghitung SR nya. Hasil penelitian ini menunjukkan bahwa setelah dilakukan transportasi benih selama 37 jam, kualitas air menurun dan SR dengan kepadatan 40 ekor/L menggunakan perlakuan zeolit 20 gram/L, karbon aktif 10 gram/L, serta garam 4 ppt adalah 37,5% sedangkan SR pada kontrol adalah 47,1%.
Keyword: 

Judul: Efektifvitas penambahan zeolit, karbon aktif, minyak cengkeh, dan garam dalam transportasi tertutup ikan maanvis Pterophyllum scalare dengan kepadatan tinggi
Abstrak: Ornamental fish transportation was usually held at high density to efficient the transportation cost. Higher density of fish carried inside the container results on higher possibility of friction among fishes, causing fishes to wound and eventually die. This research was a continuation of the previous research’s result about 20 g/ℓ zeolite addition to 2 g weighed maanvish transportation at 20 fish/ℓ density, resulting on 100% SR at 120 hours transportation. Furthermore, a research about 10 g/ℓ zeolite and 10 g/ℓ activated carbon addition to 2 g weighed coridoras fish at 20 fish/ℓ density was able to maintain a 100% SR. Addition of supplement materials such as zeolite, active carbon, clove oil, and salt is necessary. These materials were aimed to raise and maintain water quality during the transportation process, so the highest density could be attained. The aim of this research was to evaluate efectiveness of zeolite, activated carbon, clove oil, and salt to mantain water quality on good condition during closed transportation system so can minimize the mortality rate of Maanvis which transported in 120 hours dan the mortality rate after transportation. Research phases was started from measuring the oxygen consumption rate, ammonia excretion, fish fasting ability, and tolerance test towards clove oil and salt optimum dosage. This research was held for 120 hours and 30 days post-transportation rearing. Survival rate of posttransportation with density treatment of 30, 40, 50, and 60 fish/ℓ was 84%; 93%; 87%; and 74% respectively. This research resulted that 40 fish/ℓ density treatment is more effective compared to other treatments with 93% SR and highest Specific Growth Rate, namely 0,91%, and the survival rate after transportation was 100%.
Keyword: 

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
Keyword: