Judul: Simulasi Perancangan Sel Surya Triple Junction Al0.3Ga0.7As / InP / Ge Menggunakan Program PC1D Dan Matlab
Abstrak: Solar cells are one source of renewable energy that harnesses sunlight for generating electricity. Increasing the efficiency of solar cells can be done by preparing a multiple layer of semiconductors with different energy gap, commonly referred to as multijunctions solar cells. Simulations were carried out in two different models. Model 1 is a simulation that generate different valuer of currents in each layer. while Model 2 is a simulation that generate the same value currents in each layer. In Model 1, those three layers of Al0.3Ga0.7As / InP / Ge produce 26.2 mA, 16.2 mA, and 11.0 mA of ISC current respectively. The total efficiency for this model is 38.86 %. As for simulation of Model 2 Isc current value is fixed for each layer is 11.9 mA. The total efficiency of Model 2 is obtained around 20.26 %. All simulations is performed using Solar Irradiance of 1367 W/m2 obtained from the calculation of the blackbody radiation spectrum, at 6000 K.
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Judul: Simulasi Kinerja Sel Surya 4-Junction Al0.3Ga0.7As/GaAs/InP/Ge dengan Pembatasan Daerah Serapan Radiasi Matahari.
Abstrak: Solar cells development increased rapidly indicated by the increasing solar cells efficiency. One way to increase the efficiency is by using multi-junction solar cells. In this research, 4-junction solar cells Al0.3Ga0.7As/GaAs/InP/Ge has been designed and simulated using PC1Dv5.9 program in two different models. In Model 1, different current is produced in each sublayer, while in Model 2 the identical current restricted in each sublayer. Every models are simulated in two different conditions, i.e without absorption area restriction (wavelength fron 280 to 2500 nm) and with restriction of solar radiation (restricted cutoff wavelength). Model 1 showed that solar cells without spectrum restriction (efficiency 64.23%) are more efficient than the one with restriction (efficiency 36.48%). Model 2 showed smaller efficiency compared to Model 1, with 12.75 % efficiency for solar cells without spectrum restriction and 2.81% for the one with restriction. All simulations were performed using AM1.5G radiation spectrum.
Keyword: solar cells, PC1D program, multi-junction, efficiency

Judul: Penyakit Bluetongue Pada Ternak Domba
Abstrak: Bluetongue (BT) adalah penyakit akuta, non conta gious yang disebabkan oleh Arbo Virus (16), menyerang ternak domba maupun ruminant lainnya. Penularan penyakit ini dari satu hewan ke hewan rentan dilakukan oleh anthro poda genus Culicoides Sp (24,26). Penyakit BT pada domba pertama kali dilaporkan Hutcheon (1902) dan Spreull ( 1902,1905) sewaktu oleh kejadian endemik di Afrika Selatan (9), dan jauh sebelumnya yaitu pada tahun 1876 penyakit semacam BT telah dikenal (9). Transportasi dan mobilisasi ternak yang tinggi memu dahkan penyebaran BT ke negara lain yaitu Cyprus (1924) Turki (1944), Israel (1951), Amerika (1952), Spanyol (1958), Pakistan (1960) India (1964), Australia (1975), dan pada tahun 1981 penyakit BT telah ditemukan di Indonesia tepatnya di daerah Caringin Bogor yang menye rang domba impor yaitu Ras Sufflok asal Australia (16,22 ). Domba merupakan hewan yang paling rentan terhadap BT (21). Kerentanan dari masing-masing ras domba pun berbeda dan umumnya BT menyerang domba diatas 1 tahun (23). Diduga sapi bertindak sebagai reservoar (12), hanya sekitar 5% sapi yang terserang BT memperlihatkan gejala pe nyakit dengan derajat sedang sampai berat. Masa inkubasi ET pada domba yang terinfeksi secara alami diperkirakan selama 7 hari sedang pada infeksi buatan antara 2 hari- sampai 15 hari ( rata-rata 4 sampai 7 hari) (12).
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