Judul: Pengaruh rasio pemberian pakan yang berbeda terhadap produksi VFA dan NH3 rumen serta kapasitas lambung domba lokal jantan
Abstrak: The objective of this experiment was to different the VFA and NH3 production of rumen and stomach capacity of local male sheep. This experiment had held on March until may 2008. This experiment used complete randomized design and descriptive with three treatments and three replication. Significant differences among treatments further tested with Duncant test. This research used 9 local ram with two dietary treatments included: 80% grass and 20% complete feed for two months (PI), 20% grass 80% complete feed for two months (P2), 20% grass and 80% complete feed for one months and 80% grass and 20% complete feed for one months (P3). This treatment have done in two months of study. The main goal of in this research is to discover the effect of not different feed ratio to VFA and NH3 production rumen, and stomach capacity local male sheep. The treatment give not effect to volatile fatty acid and NH3 local male sheep, the results showed that relative volume of total stomach and weights of tissue to empty body weight were not significantly differents, weights of tissue retikulu-rumen, omasum and abomasum.
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Judul: Performa domba jantan lokal dengan perlakuan pakan yang berbeda selama dua bulan penggemukan
Abstrak: The aims of this study were to observe the performance of local male sheep, fed with experimental diets which were differentiated according the ratio of complete ration and grass (Brachiaria hurnidicola). The 12 local male sheep under one year old with average body weight of 15.87 1.00 kg (CV = 7.15%) were used in this study and allotted to the four experimental ration there were P1 (Complete feed 20% : Brachiaria humidicola 80%); P2 (Complete feed 80% : Brachiaria humidicola 20%); P3 (Complete feed 80% : Brachiaria humidicola 20% was given in the first month of the experiment then followed by Complete feed 20% : Brachiaria hurnidicola 80% for following month). The parameters measured were body weight gain, feed consumption, feed conversion ratio and Income Over Feed Cost. Randomized Complete Design were used in this experiment and the data were analyzed with analysis of variance (ANOVA). The result showed that the experimental treatment significantly (Pi0.05) affected daily feed consumption but the were no differences between treatments on body weight gain as well as feed conversion ratio. The highest profit was found in P2
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Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition