Judul: Hubungan antara Kecepatan Pemerahan dengan  Produksi Susu Sapi Perah Di Peternakan Rahmawati Jaya Pengadegan Jakarta  Selatan
Abstrak: The purpose of this research was to find out the correlation between milking speed and average milk yield. This research were conducted at Rahmawati Jaya dairy farm in Pengadegan, South Jakarta. The data consisted of primary and secondary data. Primary data consisted of total milking time, total milk yield, milking speed and average milk yield. Milking speed calculated as total milk yield divided by total milk time. Milk yield were measure using balance for 80 times of morning and afternoon milking. Data was analyzed using linear regression and correlation value. Linear regression of milk yield (Y) (Kg) on milking speed (X) (Kg/minute) for morning and and afternoon milkings were Y = 1.37. X0.586 (r = 0.99) and Y = 1.02.X0.574 (r = 0.99), respectively. It shows that there is a positive correlation between milking speed and milk yield. Increasing in milking speed will be followed by increasing milk yield.
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Judul: Hubungan antara Kecepatan Pemerahan dengan Produksi Susu Sapi Perah Di Peternakan Rahmawati Jaya Pengadegan Jakarta Selatan.
Abstrak: Tingkat produksi susu nasional saat ini masih terbilang rendah bila dibandingkan dengan konsumsi susu nasional, walaupun konsumsi nasional kita merupakan yang paling rendah di Asia Tenggara. Hal ini menunjukkan bahwa harus dilakukan suatu upaya peningkatan produksi susu. Terdapat beberapa faktor yang mempengaruhi produksi susu, salah satunya adalah manajemen pemerahan. Manajemen pemerahan yang mudah untuk dinilai adalah kecepatan pemerahan untuk kemudian dihubungkan dengan produksi susu yang dihasilkan. Tujuan penelitian ini adalah untuk mengetahui hubungan antara kecepatan pemerahan dengan produksi susu. Penelitian ini dilaksanakan di peternakan sapi perah rakyat Rahmawati Jaya, Pengadegan, Jakarta Selatan pada bulan Desember 2008 sampai bulan Februari 2009.
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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