Judul: Potensi dan Laju Eksploitasi Sumberdaya Ikan Kerapu di Perairan Teluk Lasongko, Kabupaten Buton, Sulawesi Tenggara
Abstrak: Ikan kerapu merupakan salah satu sumberdaya perikanan yang penting. Pada ekosistem terumbu karang, ikan kerapu memiliki nilai ekologis yang penting karena merupakan merupakan salah satu predator utama dalam rantai makanan di ekosistem ini. Selain memiliki nilai ekologis, beberapa spesies kerapu memiliki nilai ekonomis yang tinggi baik di pasar domestik maupun internasional.
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Judul: Potensi dan Laju Eksploitasi Sumberdaya Ikan Kerapu di Perairan Teluk Lasongko, Kabupaten Buton, Sulawesi Tenggara:
Abstrak: A grouper wich has a high economic value is one of the major predators in the coral reef ecosystem. Market demand on this fish has led to a declination in the natural grouper population. The study was aimed to estimate both the potential catch and the exploitation rate of grouper resources in Gulf of Lasongko. The potential catch of grouper was estimated by calculating MSY using a surplus production of Fox model; exploitation rate was measured based on a length-based on the growth parameter estimation. The result showed that the MSY of the humpback, brown marble, orange-spotted and leopard coral grouper consecutively were 3.72 ton year-1; 31.73 ton year-1; 66.57 ton year-1; 44.90 ton year-1. The exploitation rate of the humpback, brown marble, orange-spotted and leopard coral grouper consecutively were 0.51 year-1; 0.53 year-1; 0.52 year-1; 0.51 year-1. The results indicated that the exploitation rate of all species of groupers had reached their optimum level, however, the declination of the population was due to the habitat deterioration within the study site. A coral rehabilitation program should be conducted in enhancing coral reef coverage in the Gulf of Lasongko.
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Judul: Photosensor producing based on ferroelectric material of Ba0,5Sr0,5TiO3 doped by Ferrium Oxide (Fe2O3) on a P-Type Silicon Substate Si (100) applied as a digital camera with a single pixel image sensor
Abstrak: Thin film Ba0,5Sr0,5TiO3 (BST) doped with Fe2O3 was grown on p-type silicon substrate (100) using chemical solution deposition (CSD). It used the solvent 2-methoxyethanol with annealing temperature of 850°C and the doping treatment Fe2O3 of 2.5, 5, 7.5, 10 % of the mass formed BST. Pure BST had the highest absorption of 600 nm of light wavelength. Additions Fe2O3 moves highest absorption in the range of 560 nm. Fe2O3 addition was strengthening thin film sensitivity to the effects of light. In general, doping Fe2O3 10% was result the best absorbance and current-voltage of BST thin film. Electrical properties of thin films BST include dielectric, photoconductivity, and dissipation energy. Based on the current-voltage (I-V) analysis, pure BST and doped BST showed photodiode properties. Dielectric values obtained in the range from 23.32 to 243. Based on electrical conductivity data and energy dissipation, BST thin films have shown photodiode characteristics and are therefore suitable as light sensors. The image sensor in a digital camera is also a light sensor. This BST thin film has been scientifically proven to be a light sensor and also it can be applied as an image sensor. This is a novelty image sensor based on thin film Ba0.5Sr0.5TiO3.
Keyword: barium strontium titanate, thin film, photodiode, image sensor, digital camera