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: Pengaruh Perbedaan Posisi Penempatan Lampu Tabung terhadap Hasil Tangkapan Bagan Apung
Abstrak: Kenaikan harga minyak tanah memicu penggantian lampu petromaks pada perikanan bagan apung. Nelayan mencoba beralih menggunakan jenis lampu tabung (tubular lamp) dengan sumber listrik yang dihasilkan oleh mesin pembangkit listrik berukuran kecil (genset). Lampu tabung digunakan karena lampu ini lebih hemat energi dan lebih terang jika dibandingkan dengan lampu pijar. Nelayan Palabuhanratu masih belum menemukan cara paling efektif untuk mengoperasikan lampu tabung. Penelitian ini mencoba cara lain untuk memecahkan permasalahan tersebut dengan cara menggunakan lampu dalam air. Cara penggunaan lampu tabung yang benar akan memberikan hasil tangkapan yang banyak. Lampu dalam air dibuat dari bahan-bahan sederhana seperti stoples Nutrisari dan lampu tabung (TL) 24 watt. Posisi penempatan lampu tabung adalah di atas permukaan air dan di dalam air pada kedalaman 1 m di bawah permukaan air. Pada penelitian ini komposisi hasil tangkapan pada pengoperasian bagan apung dengan menggunakan kedua lampu dihitung dan selanjutnya dibandingkan. Hasil penelitian menunjukkan bahwa komposisi hasil tangkapan yang diperoleh cukup berbeda. Hasil tangkapan lampu tabung lebih beragam, namun dengan kuantitas yang lebih sedikit dibandingkan dengan lampu dalam air. Jenis tangkapan yang diperoleh lampu tabung adalah tembang (Sardinella fimbriata) seberat 21,8 kg, kembung (Rastrelliger spp.) 13,8 kg, cumi-cumi (Loligo sp.) 8,5 kg, layur (Trichiurus sp) 8 kg, tongkol (Auxis thazard) 5 kg dan teri (Stolephorus commersonii) 5 kg. Adapun komposisi hasil tangkapan lampu dalam air didominasi oleh teri seberat 39,4 kg. Hasil tangkapan lainnya adalah rebon 31,4 kg, kembung 29,5 kg, tembang 29,2 kg, layur 21,5 kg dan tongkol 0,5 kg. Kesimpulan yang diperoleh adalah penggunaan lampu dalam air lebih efektif dibandingkan dengan lampu tabung dengan berat tangkapan masing-masing adalah 151,7 kg dan 65,1 kg.
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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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