Judul: Effectiveness of the Addition of Salt in Closed Transport Media, Containing Zeolite 20 g/l and Activated Carbon 10 g/l, Gurame Fish Osphronemus gouramy Lac. With High density
Abstrak: Pengangkutan ikan biasanya dilakukan dengan kepadatan yang tinggi untuk mengefisiensikan biaya transportasi, namun semakin padat ikan yang dibawa dalam suatu wadah maka akan meningkatkan stres pada ikan. Stres yang timbul akan mengakibatkan aktifitas fisiologis ikan meningkat yang dapat memperburuk kualitas air khusunya DO, CO2, dan NH3. Penelitian ini bertujuan untuk mengevaluasi efektifitas penambahan garam pada media yang telah diberi zeolit dan karbon aktif dalam mempertahankan kualitas air media pengangkutan, sehingga dapat meminimalisasi tingkat kematian pada pengangkutan tertutup benih gurame ukuran ±4 cm. Penelitian ini dilakukan dalam skala laboratorium dengan rancangan acak lengkap. Ikan gurame Osphronemus gouramy yang diuji pada penelitian ini diberi empat perlakuan yang berbeda dan dengan tiga ulangan. Perlakuan tersebut yaitu A) 50 ekor/ℓ + 20 g/ℓ zeolit + 10 g/ℓ karbon aktif, 4 g/ℓ garam; B) 50 ekor/ℓ + 20 g/ℓ zeolit + 10 g/ℓ karbon aktif, 6 g/ℓ garam; C) 50 ekor/ℓ + 20 g/ℓ zeolit + 10 g/ℓ karbon aktif, 8 g/ℓ garam;dan D) 50 ekor/ℓ + 20 g/ℓ zeolit + 10 g/ℓ karbon aktif, 10 g/ℓ garam. Pengangkutan dilakukan selama 72 jam. Hasil penelitian menunjukkan tingkat kelangsungan hidup selama pengangkutan untuk perlakuan A, B, C, dan D masing-masing 86%, 35,33%, 16,67%, dan 5,33%. Hasil penelitian ini menunjukkan perlakuan A memberikan hasil terbaik dilihat dari nilai tingkat kelangsungan hidup (SR) sebesar 86 %, yang dihubungkan dengan nilai kualitas air media pengangkutan yang baik dimana kadar total amoniak nitrogen (TAN) 0.87±0.03, NH3 0.03535±0.005, DO 4.8033 mg/ℓ serta memiliki laju pertumbuhan harian yang paling besar yakni 4,73%, dan tingkat kelangsungan hidup selama pemeliharaan pasca pengangkutan sebesar 100%.
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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: 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
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