Judul: Karakteristik Potensi Reproduksi Domba Lokal Sumatra Jantan Pada Periode Pubertas Sampai Dewasa Tubuh.
Abstrak: Domba merupakan salah satu ternak ruminansia yang mempunyai peranan penting dalam dunia peternakan, karena kapasitasnya dalam penyediaan daging sebagai sumber protein hewani bagi masyarakat dan komoditas lain seperti susu dan wool. Domba Sumatra merupakan salah satu domba lokal asli Indonesia yang mempunyai ciri tingkat kesuburan tinggi dan dapat beranak setiap saat sepanjang tahun.
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Judul: Pola Reprodksi Domba
Abstrak: Tujuan penulisan skripsi ini ialah untuk mengetahui pola reproduksi pada domba. Tiap jenis hewan memiliki suatu pola tersendiri dalam proses reproduksinya, walaupun pada prinsipnya sama. Domba jantan mencapai saat pubertas atau dewasa kelamin pada umur 7-8 bulan dengan variasi 4-12 bulan. Dewasa kelamin tercapai sebelum dewasa tubuh tercapai. Domba jantan sebaiknya baru dikawinkan pada umur 18-20 bulan dengan fertilitas 70-95%. Pubertas pada domba betina mulai timbul pada umur 6- 12 bulan. Domba di daerah subtropis akan menunjukkan aktifitas reproduksi pada saat malam hari bertambah panjang dan siang hari bertambah pendek, disebut juga 'short day breeders', yaitu pada musim dingin dan musim gugur. Di daerah tropis seperti Indonesia tidak terdapat perbedaan lamanya siang dan malam hari. Kegiatan reproduksi domba-domba betina setempat berlangsung sepanjang tahun dan tidak terpengaruh oleh musim-musim tertentu. ...
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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