Judul: Modification and  Performance Test of The Wick Stove Fueled by Waste Cooking Oil
Abstrak: Penggunaan minyak jelantah sebagai bahan bakar kompor sumbu merupakan salah satu solusi pemanfaatan limbah minyak jelantah. Minyak jelantah memiliki viskositas tinggi sehingga minyak sulit naik pada sumbu kompor. Hasil uji pendahuluan menunjukkan kinerja awal kompor rendah dengan efisiensi 16%. Penelitian ini bertujuan meningkatkan efisiensi energi dari kompor sumbu minyak jelantah dengan cara memodifikasi bahan sumbu dan sistem inlet udara serta melakukan uji kinerja kompor yang telah dimodifikasi tersebut. Metode yang digunakan adalah uji kapilaritas sumbu, penyesuaian luas inlet udara berdasarkan perhitungan kebutuhan udara pembakaran, dan water boiling test. Bahan sumbu yang sesuai karakteristik minyak jelantah adalah benang katun dengan nilai kapilaritas 1.06 g/menit. Diameter lubang inlet udara diperbesar dari 1 mm menjadi 3 mm dan 5 mm. Kinerja kompor terbaik ditunjukkan oleh kompor dengan modifikasi sumbu saja, dimana efisiensi sistem meningkat dari 16% menjadi 26%, laju pembakaran meningkat dari 0.35 kg/jam menjadi 0.42 kg/jam, dan efisiensi kompor meningkat dari 24% menjadi 40%. Kinerja kompor dengan penerapan modifikasi sumbu dan inlet udara berhasil meningkatkan efisiensi sistem menjadi 22% dibandingkan sebelum modifikasi, dengan laju pembakaran 0.40 kg/jam, dan efisiensi kompor 38%. Tetapi kinerja ini lebih rendah dibanding penerapan modifikasi sumbu saja, karena penambahan luas inlet udara tidak diiringi peningkatan kontak udara dengan bahan bakar.
Keyword: modify, waste cooking oil, wick stove

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: Dinamika populasi manusia dan vektor pada penularan penyakit malaria oleh plasmodium falciparum dan plasmodium vivax
Abstrak: Malaria is a disease that transmitted to human by the bitting of infectious Anopheles mosquitoes. This infectious desease caused by parasite genus Plasmodium. There are two species of the parasites studied here, that cause human malaria namely Plasmodium vivax and Plasmodium falciparum. The mathematical model in discribing the transmission of Plasmodium falciparum and Plasmodium vivax on human population is divided into four classes, the susceptible, the infectious, the dormant, and the recovered classes. Mosquitoes that caused malaria are called the vector. In this case, the vector population is divided into two classes, the susceptible and infectious classes. There are two equilibrium states, a disease free state E0 and an endemic state E1. The stability of E0 and E1 is determined by considering the basic reproductive number (R0). The E0 is stable if R0 is less than one. On the other hand, the point E1 was stable given the value of R0 is greater than one. In this research the dynamic of human population and vector is discribed in to some ilustrative sample with 5% and 50% of the infected vector. It is found that, if R0 < 1, with 5% infected vector could reach the stability faster than the 50% infected vector. For R0 > 1 , it was found that, 5% infected vector could reach the stability slower than the 50% infected vector. This research also showed that the interaction between susceptibles and infectious human has no effect in to the dynamic of the human population.
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