Judul: Modifikasi dan Unjuk Kerja Kompor Sumbu Tunggal Berbahan Bakar Minyak Bintaro
Abstrak: Bintaro (Cerbera odollam gaertn) has oil content 46-64% and it is potential as a biofuel feedstock. Bintaro oil, like other bio oil, has high viscosity. Due to it, the capillarity of oil on the wick is very low. This will affect to the combustion. The objectives of this study were to analyze the properties of Bintaro oil and to examine the use of Bintaro oil as fuel for a single wick stove. In this study, sample of Bintaro oil was processed from Bintaro fruits collected around Bogor. Sample of single wick stove which was familiar stove used by household in Bogor area, was modified mainly at part of flame holder at the height of 5, 6, 7, 8 and 11 cm. The caracteristic of combustion was investigated from the flames temperature and contour at different height of flame holder. The result showed that heat loss rate values for Bintaro oil were 76.6 W, 88.5 W, 100.7 W, 111.1 W and 142.8 W for the height flame holder of 5, 6, 7, 8 and 11 cm. The flame temperature based on the heat loses were 443.97, 476.75, 451.95, 450.5 and 454.77°C, respectively. For kerosene, the heat loss and flame temperature were 245.6 W and 730.77 °C for the height flame holder of 11 cm. The boiling test resulted that for kerosene with flame holder of 11 cm ,the water boiled at temperature of 100°C for 26 minutes. The average temperature was 637 °C and the power was 1.318 W. For Bintaro oil with the height of flame holder of 6 cm, resulted the flame temperature of 482°C, the heat loss of 1.092 W, and the water boiled of 45 minutes.
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Judul: Performance test on bio oil stove using calophyllum oil and cerbera oil as the fuel
Abstrak: Bio oil stove is a wick stove which was modified from kerosene stove, and designed for vegetable oil as its fuel. The objective of the research was to conduct performance test of the stove by using Cerbera oil and Callophylum oil as fuel. The result shows that the heat capacity of the stove by using Callophylum oil as fuel was 172.58 kJ/minute, and by using Cerbera oil was 199.95 kJ/minute. The total fuel consumption were 0.12 kg for Callophylum oil usages and 0.17 kg for Cerbera oil usages. Stove efficiency and system efficiency with Callophylum oil usages were 33.64% and 13.96%. While, Callophylum oil usages only 19.39% and 9.28%., Kompor minyak nabati merupakan jenis kompor bersumbu banyak (multi-wick) yang menggunakan bahan bakar minyak nabati sebagai bahan bakarnya, kompor ini merupakan modifikasi dari kompor minyak tanah. Penelitian ini bertujuan untuk menguji kinerja kompor minyak nabati dengan menggunakan minyak bintaro dan minyak nyamplung. Hasil pengujian menunjukkan kapasitas panas yang dihasilkan oleh kompor minyak nabati dengan bahan bakar minyak nyamplung adalah 172.58 kJ/menit dan dengan bahan bakar minyak bintaro 199.95 kJ/menit. Konsumsi bahan bakar total kompor minyak nabati dengan bahan bakar minyak nyamplung dan minyak bintaro adalah masing-masing 0.12 kg dan 0.17 kg. Efisiensi kompor dan efisiensi sistem kompor minyak nabati dengan bahan bakar minyak nyamplung adalah 33.64% dan 13.96%. Sedangkan efisiensi kompor dan efisiensi sistem dengan bahan bakar minyak bintaro adalah 19.39% dan 9.28%.
Keyword: vegetable oil, stove, efficiency, Cerbera, Callophylum

Judul: igenvalues and Eigenvectors of Tridiagonal Matrix with Non Constant and Recurrent Diagonal Entries.
Abstrak: Matriks tridiagonal adalah suatu matriks yang mempunyai entri-entri bernilai nol kecuali pada diagonal utama, di bawah diagonal utama (subdiagonal) dan di atas diagonal utama (superdiagonal). Entri pada diagonal utama tidak konstan dan berulang. Setiap entri pada matriks tridiagonal ini adalah bilangan kompleks. Dalam karya ilmiah ini, akan dibuktikan 3 teorema untuk menentukan nilai eigen dengan 2 kasus dan 1 teorema untuk menentukan vektor eigen. Teorema pertama menentukan polinomial karakteristik dari matriks tridiagonal. Polinomial karakteristik dari matriks tridiagonal tersebut digunakan untuk menentukan nilai eigen pada teorema kedua dan ketiga serta menentukan vektor eigen pada teorema keempat
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