Judul: Analisis faktor-faktor yang mempengaruhi produksi usahatani kubis (Studi kasus di Desa Margamekar, Kecamatan Pangalengan, Kabupaten Bandung, Propinsi Jawa Barat)
Abstrak: Pada saat krisis ekonomi di Indonesia, produk pertanian yang berorientasi ekspor dapat diandalkan untuk menghasilkan dolar. Salah satu subsektor pertanian yang mempunyai ini adalah subsektor hortikultura mengingat peluang pasar untuk komoditas hortikultura Indonesia yang besar di pasar dunia. Salah satu komoditas yang menjadi proiritas adalah kubis.
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Judul: Analisis faktor-faktor yang mempengaruhi produksi usahatani kubis studi kasus di desa Cimenyan, Kecamatan Cimenyan, Kabupaten Bandung
Abstrak: Prioritas pengembangan komoditas hortikultura secara nasional dalam didasarkan pada komoditas-komoditas yang memberikan sumbangan nilai ekonomi tinggi, menghidupi hajat hidup masyarakat banyak, tersebar luas, dan mempunyai keunggulan kompetitif dan komparatif. Kubis merupakan salah satu komoditas hortikultura tersebut. Kubis yang berasal dari Kecamatan Cimenyan memiliki kualitas terbaik kedua di Jawa Barat, setelah kubis dari Lembang. Namun demikian, usahatani kubis masih menghadapi beberapa permasalahan, diantaranya dalam hal fluktuasi harga, produktivitas, dan pendapatan petani kubis. Penelitian ini memiliki beberapa tujuan. (1) Menganalisis pendapatan usahatani kubis di Desa Cimenyan. (2) menganalisis faktor-faktor produksi yang mempengaruhi tingkat produksi kubis di Desa Cimenyan.
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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