Judul: Peramalan Ekspor SIR - 20 ke Amerika Serikat Tahun 1987
Abstrak: Tujuan penelitian adalah meramalkan ekspor karet alam Indonesia dari jenis mutu SIR-20 ke Amerika Serikat tahun 1987. Hasil penelitian diharapkan bisa bermanfaat sebagai bahan pertimbangan dalam pengembangan dan pembinaan perkaretan Indonesia.
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Judul: Analisis penawaran ekspor dalam rangka pengembangan agribisnis karet alam Indonesia
Abstrak: Penelitian ini bertujuan untuk mengetahui faktor- faktor apa yang berpengaruh terhadap volume ekspor karet alam Indonesia ke Amerika Serikat, Jepang dan Perancis. Disamping itu juga bertujuan mencari beberapa langkah alternatif yang mungkin dapat dilakukan dalam rangka meningkatkan daya saing karet alam Indonesia di pasaran internasional, ditinjau dari sistem agribisnis karet. Dalam penelitian ini digunakan model regresi linier berganda dengan persamaan tunggal untuk menguji peubah- peubah dari sisi penawaran saja. Estimasi koefisien regresi parsial dilakukan dengan menggunakan metode kuadrat terkecil (OLS). Peubah-peubah bebas yang dipilih adalah permintaan dalam negeri, harga karet alam, nilai tukar, volume impor negara konsumen, harga karet sintetis dan pajak ekspor. Sedangkan langkah-langkah alternatif yang dapat dilakukan dianalisis secara deskriptif. Dari hasil analisis diperoleh kesimpulan bahwa masing-masing peubah bebas memberikan pengaruh yang berbeda terhadap volume ekspor karet alam Indonesia ke Amerika Serikat, Jepang dan Perancis...
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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