Judul: Desain dan Uji Kinerja Pengering Surya Tipe Terowongan Konveksi Bebas untuk Pengeringan Pisang
Abstrak: Solar tunnel dryer is one type of solar dryers that is usually used. Main problem of this dryer is the electricity needs to turn on fan which is not available in isolate areas and heat flow distribution that have not been spread evenly. This research aims to design a solar tunnel dryer with air exchange process occurs naturally due to free convection, and to test performance of the dryer for banana chips drying and compare the results between the dryers which designed with sun drying. The observation parameters are solar radiation, themperature, ratio of humidity, and moisture content, whereas the total energy consumption used declared as specific energy consumption. Total drying time is 13.25 hours, total irradiation received is 26.23 MJ/m2, able to reduce the moisture content up to 14.58 % from the initial moisture content of 70.03 % with a specific energy consumption of 14.05 MJ/kg water evaporated. The dryer designed produce free convection air flow, heat flow pattern shows the distribution pattern of temperatures that peaked in the middle. Average air flow velocity at the inlet is 0.09 m/s, at the outlet is 0.12 m/s, and at around dryer is 0.59 m/s. The result showed that final moisture content of the dryer (14.58 %) is lower than the moiture content of sun dried sample placed 100 cm above the floor which as high as sample on dryer (24.42 %), but its still higher than sun dried sample placed 10 cm above the floor (13.21 %).
Keyword: free convection, solar tunnel dryer, drying

Judul: Uji Performansi Pengering Efek Rumah Kaca (ERK)-Hybrid Tipe Rak Berputar untuk Pengeringan Sawut Ubi Jalar (Ipomoea batatas L.)
Abstrak: Rotating rack green house effect (GHE) solar dryer is one type of dryer with the source of energy from solar and biomass energy for drying of agricultural products on the racks that can be rotated verticaly. The capacity of the drying chamber is 48 kg of chopped sweet potatoes. The objective of this study is to test the performance of the hybrid green house effect dryer for drying chopped sweet potatoes and to define modeling of heat transfer in the drying chamber. There are three experiments of drying: the first is without products, the second and the third are drying products without rotating rack and implement the rotating rack 45° every 60 minutes, respectively. The results of chopped sweet potatoes drying show that drying temperature on the dryer chamber ranged between 31.6-61.5°C. To reduce moisture content from around 71.3 %wb to 9.96 %wb for Experiment 2 and to reduce moisture content of 72.76 %wb to 9.5 %wb for Experiment 3, it is needed 14.5 hours and 13.5 hour, respectively. The specific energy consumption of both experiments were 42.83 MJ/kg of moisture evaporated and 35.15 MJ/kg of moisture evaporated and the drying efficiency of 5.78 % and 7.47%, respectively. Based on the performance test, it can be concluded that rotating rack dryer shows better performance than that of without rotating rack.
Keyword: solar dryer, biomass, Chopped sweet potatoes

Judul: Aspek klinis canine ehrlichiosis
Abstrak: Canine ehrlichiosis adalah suatu penyakit yang menye- rang Canidae dan disebabkan oleh Rickettsia, yaitu Ehrli- chia canis. Organisme ini berkembang dalam sitoplasma leukocyt, terutama monocyt, dengan cara pembelahan seder- hana. Selain leukocyt, kadang-kadang organisme menyerang hystiocyt, sel-sel endothel, dan sel-sel batang (stem cells) dari sumsum tulang. Pada percobaan in vitro, Ehrlichia canis dapat berkembang dalam kultur monocyt yang berasal dari darah anjing. Canine ehrlichiosis ditemukan pertama kali pada tahun 1935, tetapi baru benar-benar diperhatikan pada permulaan tahun 1963, dan sampai kini telah tersebar di daerah tropis dan subtropis di seluruh dunia. Kejadian penyakit ini di Indonesia, dilaporkan secara resmi pada tahun 1983. Induk semang Ehrlichia canis adalah vertebrata dan invertebrata. Canidae merupakan induk semang vertebrata. Caplak Rhipicephalus sanguineus, selain sebagai induk semang invertebrata, juga bertindak sebagai vektor dalam penyebaran penyakit. Masa inkubasi canine ehrlichiosis bervariasi antara 10- 15 hari. Gejala klinik yang tidak pathognomonis menyebabkan perlunya pemeriksaan laboratorium untuk mendiagnosa penyakit ini. Pada pemeriksaan darah ditemukan keadaan pancytopenia, yaitu jumlah seluruh sel darah mengalami penurunan, dan adanya organisme intrasitoplasma leukocyt. Derajat keparahan penyakit bertambah jika ada infeksi sekunder oleh Babesia canis dan atau Haemobartonella canis yang biasa menyertai penyakit ini. Babesiosis dan haemobartonellosis sering mengacaukan diagnosa karena gejala kliniknya mirip canine ehrlichiosis. Untuk membedakan ketiga penyakit tersebut, juga perlu diadakan pemeriksaan laboratorium. Selain memperhatikan gejala klinik dan pemeriksaan laboratorium, untuk lebih lebih menguatkan diagnosa dapat dipakai uji biologis…dst
Keyword: