Judul: Optimasi Pemenuhan Kebutuhan Nutrisi Ternak Unggas melalui Formulasi Ransum Menggunakan Algoritme Genetika
Abstrak: Poultry’s nutrition is required in order to grow healthy poultry that can yield good quality products. The high contribution of cost feed cause to make a feed formula that not only fulfill poultry’s nutrition requirement, but also a feed formula with minimum cost. The purpose of this research is to develop a system that can compose a required feed formula with minimum cost using Genetic Algorithms. The results show that the percentage of poultry’s nutrition is fulfilled optimally when the population size 80, chromosome size 6, crossover rate 0.7, mutation rate 0.0125, and maximum generation 200. The results also show that to fulfill poultry’s nutrition requirement optimally in 1 kg feed formula, a feed formula contain at least 3 types of feed.
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Judul: Formulasi Ransum untuk Kebutuhan Nutrisi Ternak Sapi Potong Menggunakan Pemrograman Linier
Abstrak: Pakan mempunyai peranan penting dalam usaha peternakan khususnya dalam peningkatan produksi dan produktivitas ternak. Dari aspek ekonomi biaya pakan memberikan kontribusi hingga 70% dari seluruh biaya produksi. Besar biaya pakan ternak mendorong untuk membuat formula ransum ternak yang tidak hanya memenuhi kebutuhan nutrisi hewan ternak tetapi juga formulasi dengan biaya minimum. Penelitian ini membuat sistem yang mengoptimalkan kebutuhan nutrisi pakan menggunakan pemrograman linier dengan mempertimbangkan formula ransum dengan harga yang minimum. Hasil penelitian menunjukkan bahwa dengan melakukan 2 kali percobaan kombinasi dan menggunakan 5 jenis pakan menghasilkan persentase jenis pakan pada percobaan 1 yaitu rumput lapang 0.00%, bekatul 3.40%, ampas tahu 23.00%, rumput gajah 67.70%, dan centrosema 6.00% dengan harga minimum yaitu Rp 1470.29. Sedangkan percobaan 2 menghasilkan persentase jenis pakan yaitu rumput gajah 70.76%, daun grilicidia 29.24%, jerami padi, dedak padi dan tetes sebesar 0.00% dengan harga minimum Rp 690.88.
Keyword: formula ransum, nutrisi ternak, pemrograman linier

Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4