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: 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: Prevalensi Penyakit yang Disebabkan oleh Parasit Darah pada Anjing di Companion Veterinary Clinic, Melaka, Malaysia.
Abstrak: A disease caused by canine blood parasites (tick-borne diseases), is a condition when dog is bitten by a tick carrying pathogen. The aim of this study is to assess the prevalence of diseases caused by canine blood parasites (Anaplasmosis, Babesiosis and Ehrlichliosis) at Companion Veterinary Clinic, Melaka, Malaysia from August 2020 to July 2022. Secondary data of 103 infected dogs were taken from the medical record. Dogs at their puppy stage were more commonly diagnosed at 26.21%. Both males and females show almost same prevalence which is 52.43% and 47.57% respectively. Mongrel have a relatively higher prevalence compared to pedigree dogs but there is no breed predisposition. Multiple infections cases are more common than single infection cases. Canine tick-borne diseases show higher prevalence between intermonsoon season in Malaysia. The most common clinical signs shown by dogs are anorexia, inactivity and bleeding diatheses. For supporting diagnosis, anemia and thrombocytopenia can be observed from the patients’ complete blood count results, test kit will show positive when antibodies or antigens are detected and parasites can also be observed under microscope using blood smear. Prevalence of tick borne diseases will be influenced by both intrinsic (age, sex) and extrinsic factors (weather)., Penyakit yang disebabkan oleh parasit darah pada anjing (penyakit kutu) adalah kondisi akibat anjing yang digigit oleh patogen pembawa kutu. Tujuan dari penelitian ini adalah untuk menilai prevalensi penyakit yang disebabkan oleh parasit darah anjing (Anaplasmosis, Babesiosis dan Ehrlichliosis) di Companion Veterinary Clinic, Melaka, Malaysia dari Agustus 2020 hingga Juli 2022. Data sekunder diperoleh dari catatan medis 103 anjing yang terinfeksi. Anak anjing umumnya didiagnosa sebesar 26,21%. Baik anjing jantan maupun anjing betina menunjukkan prevalensi yang hampir sama yaitu masing-masing 52,43% dan 47,57%. Mongrel memiliki prevalensi yang relatif lebih tinggi dibandingkan dengan anjing pedigree tetapi tidak ada predisposisi ras. Kasus infeksi multipel lebih umum terjadi dibandingkan dengan kasus infeksi tunggal. Penyakit yang ditularkan melalui kutu anjing menunjukkan prevalensi yang lebih tinggi antara musim intermonsoon di Malaysia. Tanda-tanda klinis paling umum yang ditunjukkan oleh anjing adalah anoreksia, tidak aktif, dan diatesis berdarah. Untuk menunjang diagnosis, anemia dan trombositopenia dapat dilihat dari hasil hitung darah lengkap pasien. Test kit menunjukkan hasil positif bila antibodi atau antigen terdeteksi. Parasit juga dapat diamati di bawah mikroskop menggunakan apusan darah. Prevalensi penyakit kutu akan dipengaruhi oleh faktor intrinsik (umur, jenis kelamin) dan ekstrinsik (cuaca).
Keyword: blood parasites, canine, prevalence, tick-borne disease, parasit darah, anjing, prevalensi, kutu