Judul: Analisis pengendalian persediaan ayam di PT. Sierad Produce, Parung, Bogor
Abstrak: PT. Sierad Proliuce merupakan perusahaan yang bergerak di bidang usaha penyediaan daging ayam segar, beku, dan produk daging ayam olahan lainnya. Saat ini perusahaan dihadapkan pada permasalahan tingkat persediaan produk yang sangat tinggi. Akibatnya perusahaan harus mengeluarkan biaya tambahan untuk menyewa kontainer, membayar upah tambahan tenaga kerja, membayar energi listrik tambahan, dan biaya oportunitas bila biaya tersebut didepositokan. Oleh karena itu perlu diterapkan kebijaksanaan persediaan yang tepat serta penetapan jumlah persediaan optimal guna mengontrol tingkat persediaan. Tujuan pengkajian masalah khusus ini adalah untuk menganalisa sistem pengendalian persediaan ayam, membuat simulasi permintaan ayam harian, dan menetapkan kontrol tingkat persediaan optimal. Ruang lingkup dibatasi pada pengendalian persediaan ayam.
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Judul: Optimalisasi Pembelian Ayam Broiler Persediaan Karkas Pada PT. Sierad Produce Tbk.
Abstrak: Penelitian ini dilaksanakan di PT. Sierad Produce, Bogor selama dua bulan yaitu dari tanggal 20 Maret 2000 - 20 Mei 2000. Tujuan dari penelitian iui adalah (1) mempelajari sistem pengadaan bahan baku ayam broiler yang dilakukan oleh PT. Sierad Produce, (2) mengetahui tingkat pembelian optimal ayam broiler sehingga dapat diketahui kondisi optimal persediaan karkas ayam broiler sehingga dapat meminimumkan biaya pengadaan ayam broiler, (3) mengetahui berapa banyak pemesanan pengaman terhadap ayam broiler dan persediaan pengaman karkas ayam broiler untuk menjaga kemungkinan terjadinya kekurangan bahan baku sehingga kelancaran proses produksi tidak terganggu.
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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