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.
Keyword: 

Judul: Simulasi Perancangan Sel Surya Multijunction Al0.3Ga0.7As/GaAs/Ge Menggunakan Program PC1D Dan Matlab
Abstrak: Solar cell design is based on the composing of semiconductor layers (multijunction) with energy gap varies in each layer are arranged from highest to lowest can maximize the absorption of solar radiation intensity. Using optimum doping and optimum thickness on semiconductor can maximize the power conversion of the intensity absorbed. Absorbed intensity and amount of electrical power generated at each layer can increase the total efficiency of solar cell. Simulations carried out with 2 models, model 1 which produce different currents and model 2 that produce the same current. Semiconductor layers used is Al0.3Ga0.7As, GaAs, and Ge. Model 1 produces currents Isc at each layer of 26.4 mA, 14.9 mA, and 13 mA and total efficiency of 39.2%. Model 2 produces constant currents of 13 mA and total efficiency of 21.7%. The entire simulations were performed using 0.1367 W/cm2 of solar intensity that obtained from calculation of black body radiation spectrum of the sun's surface at 6000K
Keyword: 

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).
Keyword: