Judul: Pengaruh Rumpon Portable dan Jenis Lampu terhadap Hasil Tangkapan Bagan Tancap di Teluk Palabuhanratu
Abstrak: Nowadays, usage of lamps on liftnet fisheries in Palabuhanratu has experienced many changes. All liftnets, both mobile and stationary, previously used pressured kerosene lamps but now they use electric lamps. Type of lamps used in this research is light emitting diode (LED) because of its low energy consumption and more durable. Fish aggregating devices (FADs) have long been used in capture fisheries, including liftnets. Liftnets catch fish more efficiently by concentrating fish schools daytime and catch them at night fishermen by means of lights as fish attractor. The objectives of this research are (1) to compare fish catch between two liftnets equipped with 4 FADs but different in types of lamp, i.e. LED (liftnet A) and flourescent (liftnet B), (2) to compare fish catch between two lifnets equipped with flourescent lamps but different in number of FADs, i.e. 4 FADs (liftnet B) and 2 FADs (liftnet C). This research is conducted in experimental fishing approach and each lifftnet was operated 20 times. Statistical analysis using t test concluded a signifikant difference in catcah of small shrimp, hairtail fish and anchovies (α = 0,05) between liftnet A and B, and a signifikant difference in catches of anchovy, sardines, hairtail fish and small shrimp between liftnet B and C (α = 0,05).
Keyword: portable FAD., LED (light emitting diode), catch

Judul: Studi Pendahuluan Penggunaan Lampu Tabung Bereflektor terhadap Hasil Tangkapan Bagan Apung
Abstrak: The objective of the research was to determine effectiveness of the use of tubalar lamp with reflector to catch fish by using bagan apung. This research applied an experimental fishing method for one unit of bagan apung. It was taken at Palabuhanratu bay in August to September 2010. The treatment used both tubular lamp with reflector and tubular lamp without reflector were continuously treated then compared their catches. The measuring of the value of light illumination used two mediums, water and air then compared them. The highest value of light illumination was tubular lamp with reflector about 162,5 lux, in water medium and 562 lux in air medium, while the value of light illumination for tubular lamp without reflector was about 54,5 lux in water medium and 184 lux in air medium. The maximum illumination was accumulated by the light that bounce back from the edge of reflector and the light beam itself. The catchs had been increased after treated tubular lamp with reflector. The operation of bagan apung used silver reflector producing catchs a weight of 95,5 kg, it was more higher than tubular lamp without reflector a weight of 65,1 kg. The catch type had more variation, such as mackerel (Rastreliger sp), tembang fish (Sardinella fimbriata), tuna (Auxis thazard), pomfret (Pampus argentus), squid (Loligo sp), anchovy (Stolephorus sp), layur fish (Trichiurus sp), and small shrimp (Mysis sp). At the most catch there were tembang fish a weight of 21,8 kg for tubular lamp without reflector and 44 kg for tubular lamp with reflector. The catch of tubular lamp with reflector had more economic value than tubular lamp without reflector. The dominant catch type were tembang fish and promfet. Then they were followed by mackerel, tuna, and squid. On the other hand, anchovy and small shrimp could not be catched by the tubular lamp with reflector due to there were many predators and the research time was not right time, anchovy and small shrimp were not in season.
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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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