Judul: Analisis Sifat Fisik dan Hidrograf Hujan Tunggal Daerah Aliran Sungai Jambu Aye Arakundo, Aceh
Abstrak: Penelitian ini bertujuan untuk menghitung dan menganalisis faktor-faktor yang mempengaruhi limpasan permukaanserta menduga debit puncak limpasan DAS Jambu Aye Arakundo pada periode ulang tertentu.
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Judul: Analisis hidrograf dan sifat fisik Sub DAS Cipeles, Daerah Aliran Sungai Cimanuk diatas Warungpeti Kabupaten Sumedang-Jawa Barat
Abstrak: Pemanfaatan terutama sumber daya yang melebihi daya dukungnya, sumber daya tanah dan air akan negatif. Dengan dimaksudkan debit tahun. menimbulkan dampak demikian dilakukan usaha pengelolaan DAS untuk meningkatkan jumlah air dan mendapatkan dengan fluktuasi yang relatif singkat sepanjang Tujuan dari penelitian ini adalah : menghitung dan menganalisa faktor-faktor morfometri DAS untuk mengetahui parameter fisik DAS, analisis hidrograf dari curah hujan tunggal dan tinggi muka air sungai serta analisis hubungan antara sifat fisik DAS dan hidrograf satuan yang terjadi. Dudhi yono dan Mudiyarso (1980), mengemukakan bahwa DAS merupakan ekosistim yang didalamnya terjadi interaksi antara faktor faktor biotik (vegetasi) dan faktor-faktor fisik (tanah dan iklim). Untuk menghitung curah hujan rata-rata pada daerah DAS, salah satu metoda yang dapat dipergunakan adalah metoda poligon thiessen. Intensitas curah hujan adalah ketinggian hujan yang berkonsentrasi terjadi pada kurun waktu dimana air tersebut (Loebis, 1987)...dst
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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