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 faktor-faktor yang mempengaruhi besar limpasan sub das Ciesek (Daerah Aliran Sungai Ciliwung)
Abstrak: Penelitian ini bertujuan untuk mengetahui parameter- parameter karakteristik DAS, melihat pengaruh tipe hujan dan fisiografik DAS terhadap pola hidrograf satuan, menyusun hidrograf satuan untuk lama waktu hujan efektif tertentu, dan mendapatkan model hubungan antara beberapa parameter hidrograf satuan. Hidrograf merupakan gambaran dari sifat aliran limpas- an terhadap waktu. Bentuk dan ukurannya dipengaruhi oleh faktor fisiografik dan curah hujan. Hidrograf satuan dengan tipe hujan efektif dipercepat (advanced), waktu untuk mencapai puncak limpasan lebih cepat, sedangkan hidrograf satuan dengan tipe hujan efektif diperlambat (delayed), waktu untuk mencapai puncak limpasan juga lebih lama. Waktu untuk mencapai puncak limpasan juga dipengaruhi oleh kondisi kelembaban tanah pada permulaan turunnya hujan. Parameter yang diperoleh dari hasil analisis hidrograf satuan untuk masing-masing kejadian hujan, 7-9-1986; 7-11-1986; 9-11-1986; 4-1-1987; 6-6-1987 dan 6-11-1987...
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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