Judul: Komposisi, Penyebaran dan Kelimpahan Postlarva Udang Penaeid di Muara Sungai Tegal Kabupaten Karawang Jawa Barat
Abstrak: Penelitian ini dilaksanakan pada awal Maret sampai akhir Mei 1567 di muara Sungai Tegal, yang bertujuan untuk mengetahui komposisi, penyebaran dan kelimpahan postlarva udang Penaeid di muara Sungai Tegal. Stasiun penelitian ditentukan sebanyak enam buah yang antar stasiun berjarak 200 m. Postlarva udang ditangkap dengan jaring plankton dengan diameter mulut jaring 44 cm, ukuran mata jaring 520 u yang ditarik dengan kecepatan rata-rata 25 m/menit. Pengambilan contoh dilakukan sekali dalam seminggu, untuk mendapatkan data pada pasang surut dan pada pasang naik.
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Judul: Komposisi Jenis dan Ukuran Udang Penaeidae di Pertambakan Sungai Manuk Karawang Jawa Barat
Abstrak: Penelitian ini dilakukan di pertambangan Sungai Manuk Desa Sungaibuntu, Kecamatan Pedes, Kabupaten Karawang Barat. Contoh udang ditangkap di dua stasiun (W dan T) dengan menggunakan alat tangkap impes yang dioperasikan pada malam hari. Selama penelitian di masing-masing stasiun dilakukan sepuluh kali pengambilan contoh.
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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