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: Uji Coba Penangkapan Ikan dengan Bagan Tancap menggunakan Lampu LED (Light Emitting Diode
Abstrak: Stationary lift net operation is depend on the used of light bulbs. Fishermen nowadays uses tubular lamp as a source of light with high operating costs. Therefore, LED light was invented as an alternative. The goals are to prove that the LED lights can be used as a fishing tool on stationary lift net and to determine the best time of the fishing operation. Two stationary liftnet were used in this research. Four fishing activity were done in one experiment, which were done between 06:00 pm to 09:00 pm, 09:00 pm to 00:00 am, 00:00 am to 03:00 am and 03:00 am to 06:00 am. The results showed that the use of LED lights on the lift net produced 12 organisms with total weight of 167.1 kg, better than the light tubes that only produced 7 kinds of organisms with total weight of 128.2 kg. As for the best time of the catching on the lift net that uses LED lights is between 06:00 pm to 09:00 pm that produced 58.3 kg of catch, while the 09:00 pm to 00:00 am (42.9 kg), 00:00 am to 03:00 am (32.1 kg) and 3:00 am to 06:00 am ( 33.8 kg).
Keyword: tubular lamp., stationary liftnet, Sangrawayang Village, LED light

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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