Judul: Studi tentang keragaan perikanan purse seine di Kotamadya Sibolga Sumatera Utara
Abstrak: Penelitian ini bertujuan untuk mengetahui keadaan umum perikanan purse seine di Kotamadya Sibolga, mengadakan perbandingan keragaan beberapa unit purse seine dan untuk mengetahui prospek pengembangan perikanan purse seine di Kotamadya Sibolga. Penelitian ini berlangsung selama dua bulan, dari awal bulan April sampai dengan akhir bulan Mei tahun 1990. Berdasarkan data produksi perikanan laut Kotamadya Sibolga, selama periode tahun 1984-1989 diperoleh tingkat kenaikan produksi rata-rata pertahun 5.1%. Kenaikan ini diduga karena peningkatan jumlah unit penangkapan. Hasil tangkapan sebagian besar dipasarkan keluar daerah.
Keyword: purse seine fisheries, pelagic fisheries, purse seine ship

Judul: Kelayakan Usaha Penangkapan Ikan dengan Purse Seine 56 GT di Kota Sibolga Sumatera Utara
Abstrak: Based on the size of fishing gear, purse seine in Sibolga divided into two types: pukat rapat with a maximum length of 750 meters, and pukat tongkol maximum length 1,000 meters. Due to a decrease the production of small pelagic fish in the Sibolga waters have impact fishermen used pukat tongkol with previously dominated pukat rapat. Productivity of purse seine in Sibolga is 6,025.3 ton/year. This study aims to describe the pukat tongkol and determine the feasibility of through financial analysis. The method used was a survey and experimental fishing. Purse seine fisheries with 56 GT have Rp. 557,816,018 per year with 25 trips per year. Purse seine fishing gear proper developed based on R/C ratio of 1.34 and payback period within 1-2 years.
Keyword: purse seine, Sibolga waters, financial analysis

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