Judul: Analisis Pindah Panas pada Sistem Pemanas Tambahan Alat Pengering Surya Hibrid-Tipe Rak Berputar untuk Sawut Ubi Jalar
Abstrak: Auxiliary heater on GHE-Hybrid heating instrument is one of important part in heating process. Heat loss on the system can affect heating process. The aim of this research is to find water heating system efficiency and effectiveness of the heat exchanger, and determine the mathematical model of energy balance on drying stove system by analyzing heat transfer occured on auxiliary heater. Based on result, efficiency on water heating system and stove was 52-56 %, the highest heat loss on inlet air in the stove was 1800-2525 watt. The average of the effectiveness of the HE1 and HE2 respectively were 0.35 and 0.65, while the value of NTU respectively were 0.42 and 1.21. This estimation of simulation modeling can be applied, indicated by error of 5%. Base on the heat transfer analysis, stove and water heating system yield the highest heat loss, so auxiliary heater system need to be modified, such as: by adding the cover stove, expanding HE2 heat transfer area, increasing pump power and fan, and increasing biomass input rate.
Keyword: efectiveness, efficiency, heat exchanger, heat transfer

Judul: Analisis Heat Exchanger pada Pengering Efek Rumah Kaca Hybrid Tipe Rak untuk Pengeringan Ubi Jalar
Abstrak: Peranan penukar panas sangat penting pada pengering Efek Rumah Kaca (ERK) hybrid namun, efektivitas dan efisiensi termal penukar panas pada umumnya masih rendah. Tujuan penelitian ini adalah melakukan analisis sistem penukar panas berupa efektivitas penukar panas, efisiensi termal penukar panas, efektivitas sirip, efisiensi sirip dan kehilangan panas serta memberikan saran atau rekomendasi untuk meningkatkan unjuk kerja penukar panas. Metode Log Mean Temperature Difference (LMTD) digunakan untuk menganalisis penukar panas. Berdasarkan hasil analisis diperoleh efektivitas Heat Exchanger (HE) keseluruhan sebesar 0.44-0.87 dengan rata-rata sebesar 0.696 dan nilai efisiensi termal sebesar 3.2%-86.6% dengan rata-rata sebesar 50.82%. Pada analisis sirip, diperoleh nilai efisiensi sebesar 0.961-0.966 dengan rata-rata sebesar 0.964 dan efektivitas sirip tunggal sebesar 1.967-1.978 dengan rata-rata sebesar 1.974. Kehilangan panas pada sistem penukar panas masih terjadi diataranya pada dinding depan dan belakang dengan rata-rata total sebesar 388.06 W dan perbandingan kehilangan panas terhadap energi yang dihasilkan tungku sebesar 11.35%.
Keyword: efektivitas, efisiensi, penukar panas, sirip

Judul: Infeksi Neospora caninum: Kajian Morfopatologi
Abstrak: Neospora caninum is an intracellular obligate parasite newly recognized in late 1980’s. Neosporosis caused neuromuscular dysfunction (progressive lameness, hindlimb paresis and paralysis) in dog and abortion in cow. The dog is a definitive host of Neospora caninum. Cow, sheep, goat, horse, deer, water buffalo, rhinocheros, and fox could be an intermediate host. Gross examination was found in heart, liver, central nervous system, dan skeletal muscle. Histopatological examination demonstrated multifocal necrosis of brain, interstisial non-suppurative myocarditis, and multifocal inflammation in liver. This study reviews information on pathomorphological, pathogenesis, prevention, and treatment of neosporosis
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