Judul: Suatu Studi Tentang Fishing Ground Tuna Long Line di Perairan Indonesia
Abstrak: Tujuan dari penelitian ini adalah untuk memperkirakan nilai fishing ground tune long line secara relatif untuk perairan Indonesia yang ditentukan atas dasar perhitungan besarnya hook rate. Dari hasil penelitian, diperoleh bahwa nilai hook rate rata-rata perairan Indonesia adalah 2,30 % dengan kisaran antara 1,12 % sampai dengan 3,30 %.
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Judul: Suatu studi tentang prospek perikanan tuna di perairan Indonesia
Abstrak: Ikan tuna merupakan suatu sumber protein penting bagi umat manusia di dunia. Harga tuna yang tinggi di pasaran dunia mengakibatkan kompetisi penangkapan tuna meningkat terus. Sebagian besar dari jenis-jenis tuna utama di duga telah mencapai tingkat pengusahaan maksimum (fully exploited). Ikan tuna mempunyai daerah penyebaran yang sangat luas, hidup di daerah pantai dan di lepas pentai, di daerah tropis dan subtropis, meliputi Samudera Hindia, Pasifik den Atlantik. Penyebaran tuna sangat dipengaruhi oleh kondisi oseanografis setempat seperti arus, temperatur, salinitas, kecerahan, dan lain-lain. Penangkapan ikan tuna dilakukan dengan berbagai alat penangkapen. Diantaranya yang umum dipergunakan adalah longline, pole and line dan purse seine. Produksi tuna di dunia terutama diperoleh dari hasil tangkapan tuna long line. Di perairan Indonesia, penangkapan tuna terutama di lakukan oleh kapal-kapal asing, seperti Jepang, Korea Selatan dan Taiwan. Untuk periode tahun 1970-1978 Jepang melakukan operasi penangkapan tuns longline di perairan Indonesia rata-rata 10.905 kali, dengan hasil rata-rata 481.199 ekor setiap tahunnya. Hasil tangkapan ini didominasi oleh yellowfin (54-72%), bigeye (20-28%) dan albacore (0-8%). ...
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Judul: Hybrid solar cells of ZnO nanoparticles/chlorophyll was modified metal ions (Zn2+ and Cu2+ )
Abstrak: Zinc Oxide (ZnO) is a n-type semiconductor with a wide the energy band (Band Gap) is 3.37 eV at room temperature and 3.34 eV at low temperature with a large exiton binding energy is 60 meV. ZnO has been synthesized by hydrothermal method, resulting in a decrease in particle size over the duration of the hydrothermal changes. Crystallographic structure of ZnO were characterized using XRD, has shown the characteristic pattern of a hexagonal wurtzite structure, the crystallite size increases to changes in particle size. Changes in particle size has also led to a change in the absorption peak of ZnO as has been demonstrated posted under test using the optical properties of UV-Vis spectrophotometer. Changes of this uptake has also led to changes in the energy band gap, which increases its band gap energy of the particle size. In electronic applications, especially in solar cells. Chlorophyll is considered less effective, because of their very nature are easily degraded as a result of several reactions which are acid, lighting and temperature. The results of the stability test using a halogen lamp 34 W/m2 for 5 hours, that the substitution of chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form more stable than natural chlorophyll. The characterization of the optical properties, the combination of ZnO / chlorophyll in the form of hybrid films has led to a shift in the absorption region of ZnO becomes more widely from the UV to Visible. ZnO/chlorophyll has absorption range of 350-515 nm, ZnO / Zn-feofitin 332-401 nm and 332-632 nm for Cu-feofitin. The combination of ZnO/chlorophyll and CuSCN as a solid electrolite in hybrid solar cell, a modified chlorophyll with metal ions Zn2+ and Cu2+ has been shown to form a more stable I-V curve. It is characterized by its fill factor value greater than natural chlorophyll. Nevertheless, solar cells with natural chlorophyll has been able to produce higher efficiency values of chlorophyll were substituted.
Keyword: Hydrothermal, ZnO/Chlorophyll modified, Hybrid Solar Cell