Judul: Model Jaringan Saraf Tiruan Pendugaan Suhu Air Kolam dengan Tutup Plastik untuk Budidaya Benih Ikan.
Abstrak: High and low temperature, as well as the fluctuation of water temperature are not suitable for fish farming, especially for jouvenile fishes. The using of plastic cover is one of several alternatives to maintain water temperature, as it is used in the temperature maintaining of horticulture greenhouse. Six treatments with two replications were applied in this research. The treatments were transparent plastic covers, blue plastic covers, and no plastic cover with 15 cm and 35 cm water depth. The relationship between water temperature with related variable : light intensity, relative humidity, air temperature, wind velocity, and the time was formulated with artificial neural network. Simulation results showed that in a 2x2-m2 pond by using plastic cover can increase 5oC water temperature compared no cover. Plastic cover can maintain the night water temperature but can not avoid the excessive noon temperature. Some actions that can be done to reduce the excessive temperature is opening plastic cover in the afternoon, giving aeration, and flowing fresh water. The most significant impact is flowing fresh water.
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Judul: Penggunaan Naungan yang Berbeda pada Pendederan Benih Ikan Lele di Bak Terpal
Abstrak: Catfish fry rearing is usually done in the pond of land in open space. Fish fry mortality because of high fluctuations in water quality to be very high, especially in the rainy season. Shade usage on fish rearing was expected to reduce the changes of water quality parameters from heat and rain. This research uses terpaulin container with a (300X400X50) cm dimension, each were given shades from different materials as given, transparent plastic (treatment 1), shading net (treatment 2), and dark plastic (treatment 3), while control container were not given any shade. This research resulted in a very low survival rate 13.82±8,77% on treatment 1, 1.08±1,87% on treatment 2, 0.12±0,2% on treatment 3, and 13.65±4,17% on control. Highest weight daily growth rate were acquired by treatment 1, namely 1,094±0,0186%, and the lowest were in control fish 1,079±0,0096%. Highest increase the absolute length were acquired by treatment 1, namely 3,53±0,602 cm, and the lowest were in control fish 2,79±0,185 cm. Based on variance analysis, the usage of shades on catfish rearing did not gave a significant effect on increase the absolute length and weight daily growth rate (p>0,05), but it affects the survival rate significantly (p<0,05). The usage of transparent plastic is suggested for catfish fry rearing in tarpaulin container.
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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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