Judul: Design Development and Structural Strength Simulation of Multifuel Stove (gas, kerosene, ethanol gel)
Abstrak: Rendahnya produksi dalam negeri dan meningkatnya subsidi pemerintah, menyebabkan potensi kelangkaan LPG sebagai bahan bakar kompor di Indonesia. Rumah tangga dengan kompor berbahan bakar tunggal akan rawan terganggu adanya kelangkaan, termasuk alternatif bahan bakar terbarukan. Penelitian ini bertujuan untuk mengembangkan rancangan kompor agar dapat memanfaatkan lebih dari satu jenis bahan bakar (multifuel). Perancangan dibantu dengan perangkat lunak CAD Solidworks Premium 2018. Rancangan memiliki mekanisme geser untuk pengaturan burner. Memanfaatkan bahan bakar gas lpg baik tabung maupun kaleng, minyak tanah 750 ml, dan gel ethanol 360 ml. Rangka dibentuk dengan metode tekuk. Rangka terdiri dari lima bagian dengan penghubung sekrup. Dimensi kompor (panjang, lebar, tinggi) yaitu (350, 350, 250) mm. Kompor memiliki satu tungku dengan diameter minimum panci/ wajan 90 mm. Analisis kekuatan rangka dilakukan dengan metode finite element analysis. Model CAD kompor diuji pada ketebalan 1 mm dan 2 mm dengan material plat stainless AISI 316. Hasil simulasi menunjukkan model struktur rangka kompor dengan tebal 2 mm dan 1 mm memiliki nilai von misses stress maksimum yang masih lebih besar dibanding yield strength material sebesar 172 MPa. Nilai displacement plat 1 mm lebih besar dari plat 2 mm. Nilai bobot total kompor pada kondisi tanpa bahan bakar sebesar 1191.41 gram., Domestic production and government subsidies, cause a potential shortage of LPG as stove fuel in Indonesia. Households with single-fuel stoves will be vulnerable to scarcity, including alternative renewable fuels. This study aims to develop a stove design that can utilize more than one type of fuel (multifuel). Design is aided by CAD software Solidworks Premium 2018. It has a sliding mechanism for burner setting. Stove can run with lpg, both in canisters and cans, 750 ml of kerosene, and 360 ml of ethanol gel. The frame is formed by the bending method. The skeleton consists of five parts with screw join. The dimensions of the stove (length, width, height) are (350, 350, 250) mm. The stove has one burner with a pot/pan diameter at least 90 mm. The strength analysis of the frame was carried out using finite element analysis. The stove model was tested at a thickness of 1 mm and 2 mm with AISI 316 stainless plate material. The simulation results show that the stove structure model with a thickness of 2 mm and 1 mm has a maximum von misses stress value is greater than the yield strength of material that 172 MPa. The plate displacement value of 1 mm is greater than the 2 mm plate. The total weight value of stove in conditions without fuel is 1191.41 grams.
Keyword: Stove, Multifuel, Fuel, Household, and Finite Element Analysis

Judul: Optimization of Oxygen Flow Valve Hole in Small Industrial Scale  Husk Furnaces
Abstrak: Penggunaan bahan bakar berbasis fosil seperti minyak bumi dan gas bumi yang semakin tinggi menyebabkan adanya ketidakseimbangan kebutuhan energi dengan ketersediaan energi tersebut. Oleh karena itu dilakukan pemanfaatan biomassa sekam padi sebagai energi alternatif yang diaplikasikan pada kompor biomassa berupa tungku sekam. Tujuan penelitian adalah untuk mengoptimasi efisiensi tungku sekam skala industri kecil dengan menvariasikan lubang katup aliran oksigen dan massa air yang dipanaskan. Pengujian pada tungku sekam dilakukan dengan metode Water Boiling Test (WBT) dengan parameter uji: waktu pembakaran, FCR, daya masuk, daya keluar, daya yang hilang, energi radiasi, dan konduktivitas termal bagian wajan dan cerobong tungku sekam. Pengujian dilakukan terhadap 4 variasi lubang katup aliran oksigen (horizontal: 18 x 36 cm2 dan 27 x 36 cm2, vertikal: 27 x 24 cm2 dan 27 x 12 cm2) dan 3 variasi massa air yang dipanaskan (6 kg, 12 kg, 18 kg). Diperoleh efisiensi tungku sekam paling tinggi pada pemanasan 18 kg air, dan berdasarkan tiap parameter uji, kinerja tungku sekam paling optimum pada lubang katup horizontal 27 x 36 cm2 dengan rata-rata efisiensi 17,32%., The increasing use of fossil-based fuels such as oil and natural gas causes an imbalance between energy demand and the availability of that energy. Therefore, the use of rice husk biomass as an alternative energy is applied to a biomass stove in the form of a husk stove. The aim of this research is to optimize the efficiency of a small industrial scale husk furnace by varying the oxygen flow valve holes and the mass of the heated water. The test on the husk furnace was carried out using the Water Boiling Test (WBT) method with test parameters: combustion time, FCR, input power, output power, power loss, radiant energy, and thermal conductivity of the pan and chimney of the husk furnace. Tests were carried out on 4 variations of the oxygen flow valve holes (horizontal: 18 x 36 cm2 and 27 x 36 cm2, vertical: 27 x 24 cm2 and 27 x 12 cm2) and 3 variations in the mass of heated water (6 kg, 12 kg, 18 kg). The highest efficiency of the husk furnace was obtained at heating 18 kg of water, and based on each test parameter, the performance of the husk furnace was most optimum at the horizontal valve hole 27 x 36 cm2 with an average efficiency of 17.32%.
Keyword: efficiency, husk furnace, optimization, oxygen flow valve hole, rice husk, WBT

Judul: Infection Of Babesia Bigemina In Cattle And Methods Of Control
Abstrak: Babesia bigemina is the species which occurs mostly through out the tropics and subtropical areas. It gains access to the susceptible cattle through the bite of an· ig fected tick and penetrates an erythrocyte. The pathogenesis of B. bigemina is considered to be as highly pathogenic and may cause heavy mortality in susceptible stock. Infecied cattle rapidly become dull and listless and lose their appetite, the erythrocytes are destroyed resulting anaemia, icterus, emaciation, weakness, and a drop in milk production. Death and loss of productivity due to B. bigemina account for the economic loss.
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