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Abstract. This research investigates the performance and emissions of an engine by biogas and gasoline. The experiments use biogas of palm oil mill effluent (POME) with turbocharger at engine loading conditions (100, 200, 300, 400, and 500 Watt). Specific fuel consumption and thermal efficiency are used to compare engine performance, and emission analysis is based on parameters such as carbon monoxide (CO), hydrocarbon (HC), carbon dioxide (CO2) and oxide (O2). The experimental data show that the maximum thermal efficiency when engine use biogas and gasoline is 20.44% and 22.22% respectively. However, there was CO emission reduction significantly when the engine using POME biogas.

Speed bump adalah bagian jalan yang ditinggikan menggunakan tambahan aspal, karet, atau semen yang dipasang melintang di jalan untuk memperlambat laju/kecepatan kendaraan. Dalam riset ini, pertama sekali dijelaskan tentang desain serta pembuatan speed bump dengan geometri struktur padat dari bahan concrete foam yang diperkuat dengan serattan dan kosong kelapa sawit (TKKS). Speed bump dirancang dengan ukuran panjang 400 mm, lebar 200 mm dan tinggi 150 mm, memenuhi KM Menhub nomor 3 tahun 1994. Ada dua model speed bump, yaitu bentuk padat dan berongga. Selanjutnya kedua model dianalisis kekuatan strukturnya menggunakan program Ansys APDL 14.5. Pada model padat, jika gaya yang diberikan sebesar 80.000 N tegangan maximum yang terjadi pada bagian kritis struktur sebesar 8.01MPa. Dari hasil uji tekan diperoleh bahwa kekuatan tekan material confoam (type A5) adalah 2,1MPa; sedangkan kekuatan tarik menggunakan Brazilian test sebesar 0,18 MPa. Bila dibandingkan dengan kekuatan tarik maksimum material confoam dapat disimpulkan bahwa struktur tidak aman untuk digunakan untuk beban maksimum (kenderaan truk), sesuai kelas jalan golongan IIIC.Untuk, itu perlu dilakukan redesign struktur speed bump. Struktur yang aman akan digunakan sebagai penggerak free-energy generator. Speed ​​bumps are elevated parts of the road using additional asphalt, rubber, or cement that are installed across the road to slow down the vehicle's speed. Firstly the research explained about the design and manufacture of speed bumps with the solid structure geometry of concrete foam materials strengthened with the fiber of oil palm empty bunches. Speed ​​bump was designed with a length of 400 mm, a width of 200 mm and a height of 150 mm, in accordance with KM Minister of Transportation number 3 of 1994. There are two speed bump models, namely solid and hollow. Then, the two models are analyzed for structural strength using the Ansys APDL 14.5 program. If the force applied is 80,000 N on solid model, the maximum voltage that occurs in the critical part of the structure is 8.01MPa. Pressure test showed that the strength pressure of the confoam material (type A5) was 2.1 MPa; while the tensile strength using the Brazilian test is 0.18 MPa. If it is compared with the maximum tensile strength of confoam material, it can be concluded that the unsafe structure is used for maximum loads (truck vehicles), according to the IIIC road class. Therefore, it is necessary to redesign the speed bump structure. A safe structure will be used to drive a free-energy generator.

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