Judul: Studies On Fish BehaviourIn Relation Net Transparency of Millennium Gillnet Operation In Bondet Waters, Cirebon
Abstrak: The millennium gillnet was recently adopted by Cirebon fishermen. Its use has been spread to other areas. Research on this type of gear is rare. The objectives of this research were: (1) to investigate the effects of net transparency on fish behaviour in relation to net panel of millennium gillnet; and (2) to obtain information on catch composition and capture process of millennium gillnet. This research consisted of laboratory experiment and field experiment. The laboratory experiment was conducted from August 2005 to March 2006 at Fish Behaviour Laboratory, Tokyo University of Marine Science and Technology. The field experiment was carried out in October to November 2006 in waters off Cirebon. The result concludes that: (1) net transparency affected the Japanese Jack mackerel behaviour in relation to contrast colour of the net panel; (2) the effect of usage - reduced transparency on mackerel behaviour was not significant; (3) catch of millennium gillnet in the field was dominated by threadfins (71.29%); and (4) capture condition of the catch of millennium gillnet was dominated by gilled and wedged.
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Judul: Optimasi Teknis Perikanan Gillnet Millenium di Desa Karangsong, Kabupaten Indramayu
Abstrak: Northern Java Sea has already know as one of the most productive sea in Indonesia. Development of PPI Karangsong, is one of Fisheries development policies of Indramayu Regency for increasing the regional economic growth. Gillnet millennium is one of the most popular fishing gear in PPI Karangsong. Fishermen in Karangsong use gillnet millennium in some variation type of technical and operation method. This study aims to determine which gillnet millennium variation type has the best optimization score. This study was held by using survey method, and the data collected by purposive sampling method. Based on the results of the study revealed that the ship that operate in the PPI Karangsong made of wood with the size of the 5 GT, 20 GT, 30 GT, 40 GT and 60 GT. .Gillnet millenium that are used by fishermen made of polyamide monofilament material, the size of the gillnet millenium that is operated on the basis of the size of the ship is all 20 pieces up to 110 pieces. The fishermen in karangsong most of the fishermen are full. The score of the function for four groups as studies object are 0,18 (< 10 GT), 2,812 (20 GT), 1,824 (30 GT), and 2,89 (> 40 GT). Production factors that influence the optimization of gillnet millennium are depth of the net, number of day of the trip, and the fishing location.
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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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