Judul: Analisi manajemen pengendalian persediaan compo rubber sebagai bahan baku rubber lining pada CV. Mandala Logam, Kabupaten Garut, Jawa Barat
Abstrak: Indonesia saat ini menempati posisi kedua terbesar di dunia baik sebagai negara produsen karet maupun sebagai pengekspor setelah Thailand. Komoditas karet sampai saat ini masih memiliki peranan yang sangat penting dan strategis dalam perekonomian nasional serta menjadi sumber pendapatan andalan devisa negara. Kontribusi produk domestik bruto (PDB) dari komoditas ini menjadi enam trilyun rupiah setiap tahunnya, menyerap sekitar 1,7 juta tenaga kerja, serta berperan dalam mendorong pertumbuhan sentra-sentra ekonomi baru di wilayah pengembangan. Selain itu, peningkatan nilai karet alam serta produk turunannya selama tahun 2001-2005 mengalami peningkatan sebesar 4,39 persen. Kebijakan yang diambil melalui strategi pengendalian dan pemeiliharaan persediaan oleh perusahaan saat ini bertujuan untuk mengendalikan ketidakpastian produksi.
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Judul: Analisis pengendalian persediaan bahan baku crumb rubber Pt. Virco (Virginia Indonesian Rubber Company), Padangsidempuan, Sumatera Utara
Abstrak: Perkebunan karet di Indonesia memiliki hasil yang cukup untuk menghasilkan bahan baku bagi industri yang menggunakan karet sebagai bahan baku dasar atau pembantu. Sumatera Utara merupakan salah satu penghasil karet utama di Indonesia. Hasil karet Sumatera Utara diekspor dan merupakan komoditi ekspor nomor dua setelah kelapa sawit. Dari berbagai industri pengolahan karet, industri crt~nib rubber adalah industri yang paling banyak menggunakan bahai baku (BOKAR) berupa lump.
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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