Judul: Studi terhadap pendugaan model kurva laktasi pada sapi perah
Abstrak: Kurva laktasi pada sapi perah telah diduga dengan menggunakan tiga model yaitu, fungsi Gamma tak lengkap, fungsi kebalikan polinomial, dan regresi tak linear yang masing-masing adalah Ya xe cx; Y = x(a + bx + cx²)² ....
Keyword: model kurva laktasi, sapi perah

Judul: Pendugaan Model untuk Bobot Badan Sapi Bali Jantan
Abstrak: Pengukuran bobot badan ternak sapi sangat penting dan perlu untuk diketahui, karena bobot badan merupakan salah satu faktor penentu nilai dari ternak sapi tersebut. Cara yang paling akurat untuk meng$tahui bobot badan ternak dapat dilakukan dengan menimbang ternak secara langsung. Oleh karena sulitnya mendapatkan timbangan ternak terutama di daerah pedesaan, perlu cara lain untuk mengetahui bobot badan yaitu dengan cara pendugaan bobot badan ternak sapi melalui pendekatan hubungan antara satu atau lebih ukuran-ukuran tubuh ternak dengan bobot badannya. Data yang diainati adalah data dari Rumah Potong Hewan (RPH) Cakung DKI Jakarta. Data yang digunakan adalah data sekunder 133 ekor sapi bali jantan dari daerah peternakan Nusa Tenggara Timur dan Bali, yang terdiri dari 45 ekor kelompok umur 1,s - 2 tahun, 37 ekor kelompok umur 2 - 2,5 tahun, daii 51 ekor kelompok ulnur 2,s - 3 tahun. Model penduga bobot badan sapi bali jantan untuk kelompok umur 1,5 - 2 tahun adalah ? = 0,304 X,I.OZ1, keloinpok umur 2 - 2.5 tahun adalah ? = 0,720 XYm, sedangkan model penduga bobot badan sapi bali jantan untuk kelompok umur 2,5 - 3 tahun adalah ? = 1,440 X,0.999.
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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