Judul: Kajian Pengering Rotari Tipe Co-Current untuk Pengeringan Sawut Ubijalar
Abstrak: Rotary drying is a very complicated process that implies not only thermal drying but also movement of wet material within the dryer. The objective of this research were to evaluate performance of rotary dryer, to identify amount of energy consumption which are used during the drying process, to develop model of rotary drying and to identify drying cost per kg of sweet potato grates. Drying characterisctics of product need to be established because of important information for the design, prediction, and modelling. The model of rotary drying was constructed based on energy and mass balance. The differential equations were solved by simultaneous-numerically. This model applied to predict temperature dryer chamber, temperature product, moisture content and RH. The result showed that the performance of rotary dryer depends on feed rate sweet potato grates into drying chamber. High feed rate could decrease temperature in drying chamber. The residence time of all experiments were 18 minutes. Hold-up of all experiments in this study were relatively low that ranges 9-36 kg. The specific energy consumption in all of the experiments was between 5.51-14.26 MJ/kg H2O. The high feed rate (3 kg/1 min) had the lowest specific energy consumption. Conversely, the lowest feed rate (3 kg/4 min) had the highest specific energy consumption for all experiments. The high total efficiency could be found from high feed rate, the feed rate (3 kg/1 min) is highest total efficiency for all experiments. The model can be used to obtain temperature profiles of air and the product in dryer chamber. Using the model, change of air temperature and product during drying were successfully predicted. Coefficient of determination (COD) between measured and calculated ranges 0.819-0.992, respectively. However, the model could not predict moisture content and RH accurately. The drying cost of grates is Rp 1 494 per kg wet grates. It is relatively expensive for drying.
Keyword: Co-current rotary dyer, Specific energy consumption, Feed rate, Sweet potato

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: Studi Kasus Liver Neoplasia pada Anjing Shih Tzu
Abstrak: Liver neoplasia is the excessive and uncontrolled replication of hepatocytes that forms nodules visible in ultrasonography. The purpose of this study is to study and discuss the characteristic, diagnosis and treatment of liver neoplasm through the interpretation of ultrasonography and hematology in a Shih Tzu dog. Ultrasonography is conducted with a Chison Q8 ultrasound machine with a 5 to 7 MHz frequency convex probe on lateral recumbency. The blood cells, liver enzymes and nodules sizes were the main parameters in this study. The results in the period of three years from 2021 to 2023 were interpreted and supported with secondary data sources. The Shih Tzu dog is 14 years old in the year 2023 with a body weight of 5.21kg. No obvious clinical signs were observed during previous examinations. However, lethargy, vomiting and anorexia were recorded in its latest examination. Thrombocytosis, granulocytosis, high liver enzymes and hypoglycemia, which are some of the neoplastic clinical manifestations were also presented by this patient. Besides, liver neoplasm, spleen neoplasm and biliary sludge were the sonogram findings of this patient. The liver and spleen neoplasm was observed stable, while the biliary sludge volume fluctuated. The treatment strategy recorded is Ondansetron, Samylin®, Ornipural and Ursodeoxycholic acid.
Keyword: Blood biochemistry profile, Hematology, Liver Neoplasia, Shih Tzu, Ultrasonography