Judul: Pendugaan model fungsi produksi dan analisis efisiensi usaha penggemukan domba (studi kasus di peternakan domba tawakkal desa Cimande Hilir, kecamatan Caringin, kabupaten Bogor)
Abstrak: The fattening sheep farming is most profitable husbandry enterprise. The most important reason are, it only used a little capital and fastest to get break even point. The aim of fattening program is to get growth of body weight level and the production function model is an effective way to know it. In Tawakkal sheep farming, the best production function model that can be used is Cobb-Douglas mood.
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Judul: Analisis harga pokkok penjualan dan titik impas usaha penggemukan ternak domba (studi kasus peternakan domba tawakkal)
Abstrak: The aims of this research are: (1) to learn production technical aspects in the sheep fattening Twakkal Farm, (2) to count cost of goods manufactured and cost of goods available for sale which profitable for Tawakkal Farm, (3) to determine break even point in the Tawakkal Farm, and (4) to know the value of marginal income ratio, marginal of safety and business profitibility of Tawakkal Farm. This research was carried out in April until May 2007. Primaru and secondary data were utilized in this study. This research design was analitical descriptive with case study method.
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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