Judul: Modifikasi Penukar Panas Model Pengering Hybrid Tipe Rak untuk Pengeringan Chip Mocaf
Abstrak: The main problems of previous experiment using rack type greenhouse effect dryer (GHE) equipment were low level of drying efficiency and high level of energy consumption, therefore the purposes of this experiment were to develop the design of heat exchanger and biomass stove from rack type GHE dryer and to develop the performance of hybrid rack type GHE dryer for drying mocaf chips. One of the developments of the design was the addition of circle type fins on heat exchanger as much as 9 fins per pipe. The dimension of each fin was 0.093 m x 0.063 m. Materials of the stove were bricks by dimension of 0.58 m x 0.58 m x 0.3 m (L x W x H). The drying experiment during daylight period using mocaf chips with capacity of 18.04 kg from moisture content of 69.88%db to 12.56%db needed 11.5 hours with drying temperature of 43.65C. The drying efficiency was 9.37%, thermal efficiency was 24.84% and specific energy consumption was 28.19 MJ/kg vapor. In the experiment capacity of 18.09 kg mocaf chips during daylight and night period from moisture content of 70.74%db to 13.76%db required drying time of 15 hours with drying temperature of 45.83C, drying efficiency was 6.79%, thermal efficiensy was 24.32%, and specific energy consumption was 32.80 MJ/kg vapor. This research resulted increased efficiency of 1.697% than previous design.
Keyword: Bogor Agricultural University (IPB), efficiency, stove, fin, mocaf chip

Judul: Rancang bangun dan Uji Kinerja Pengering  Singkong Efek Rumah Kaca (ERK)-Hibrid Tipe Rak dengan Turbin Ventilator untuk Sirkulasi Udara
Abstrak: Cassava is the fourth leading commodity after rice, wheat and corn. Market demand and high productivity of cassava make it as one of the potential export commodities. In case for export or industrial use fresh cassava must be processed first into semi-finished materials for added value. It will be better if the added value is left to the farmer. For the purpose, the farmer needs to be furnished with proper and affordable technology. This study aims to design, construct and testing a dryer which apply the principle of greenhouse effect by additional heating of biomass furnace. Dryer is designed with a capacity of 180 kilograms cassava from 65% wb moisture content up to 13% wb moisture content. Drying chamber has dimensions of 2 m x 1.5 m x 2.4 m (L x W x H) with 30 shelves. This dryer has a cross flow type heat exchanger and regulating the circulation of air using a turbine ventilator. On testing with the full capacity, the dryer can dried up 180 kg cassava chips from 61.31 %wb (158.53 %db) moisture content to 9.87 %wb (11.01 %db) moisture content. On these test the dryer has a total efficiency of 18.3%, energy share of solar energy 7.72% and biomass 92.28%, drying time is 49 hours at a rate of 4.50 %db/h. While testing with half capacity, was dried 95 kg cassava chips from moisture content of 69.47%wb (232.26 %db) to 8.81 %wb (9.67 %db), the total efficiency of the dryer was 14.84% with the share of energy from solar energy 7.31% and 92.69% of the biomass, drying time required is 28 hours with the drying rate 8.56 %db/h.
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Judul: Infeksi leucocytozzon simondi (Mathis dan Leger, 1910) pada itik
Abstrak: Leucocytozoonosis pada itik adalah penyakit protozoer yang disebabkan oleh parasit darah Leucocytozoon simondi. Protozoa ini ditularkan oleh lalat penghisap darah (Simulium sp.). Di dalam tubuh induk semang antara (vektor) Simulium parasit mengalami tahap gametogoni yang kedua (pembentukan gamet dan pembuahan) dan sporogoni. Pembuahan makrogamet oleh mikrogamet terjadi segera sesudah vektor menghisap darah itik yang mengandung gametosit. Pembuahan menghasilkan zigot yang dapat bergerak (ookinet) yang masuk dinding usus vektor dan kemudian memasuki tahap sporogoni. Tahap sporogoni memerlukan waktu kira-kira 1 minggu (Fallis dan Desser, 1977) untuk menghasilkan sporozoit. Sporozoit bergerak menuju kelenjar ludah vektor, tempat mereka berkumpul. Sporozoit dipindahkan ke dalam tubuh itik pada saat vektor menghisap darah itik. Di dalam tubuh itik, parasit mengalami tahap skizogoni dan tahap gametogoni yang pertama (pembentukan gametosit). Sporozoit memasuki peredaran darah itik dan memasuki sel-sel parenkhim hati membentuk skizon hepatik (Fallis et al., 1974). Setelah 4 6 hari, skizon hepatik dewasa menghasilkan merozoit dan sinsitia. Merozoit dari skizon hepatik memasuki eritrosit dan eritroblas membentuk gametosit bundar, sedangkan sinsitia memasuki sel-sel RES di seluruh tubuh membentuk megaloskizon. Megaloskizon dewasa terbentuk dalam waktu 5 hari di dalam sel-sel itu dan menghasilkan merozoit. Merozoit dari megaloskizon memasuki limfosit dan leukosit lainnya membentuk gametosit memanjang. ...
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