Biofuels as alternative fuels in today’s world are becoming increasingly important for the reduction of greenhouse gases. Here, we present and evaluate the potential of a new alternative fuel based on the conversion of medium-chain fatty acids to biojet (MBJ), which was produced from coconut oil using hydrotreated processes. MBJ is produced by using both deoxygenation and isomerization processes. Several blends of this type of biojet fuel with Jet A-1 were run in a gas-turbine engine (Rover 1S/60, ROTAX LTD., London, England) for the purpose of investigating engine performance and emissions. Performance results showed almost the same results as those of Jet A-1 fuel for these fuels in terms of thermal efficiency, brake-specific fuel consumption, turbine-inlet temperature, and exhaust-gas temperature. The results of exhaust-gas emissions also showed no significant effects on carbon monoxide, unburned hydrocarbon, and nitrogen oxides, while a decrease in smoke opacity was found when blending MBJ with Jet A-1. MBJ performed well in both performance and emissions tests when run in this engine. Thus, MBJ brings hope for the development of aviation biofuels in tropical regions that have an abundance of bioresources, but are limited in technology and investment capital.

Indonesia has developed and operates the LAPAN-TUBSAT micro satellite since 2007 for supporting the surveillance application to observe the earth surface. LAPAN-TUBSAT satellite carried a video camera as an imaging sensor with 5 m ground resolution and 3.5 km swath. Data from this camera still have a weak geometric. This paper will reviews regarding LAPAN-TUBSAT data processing from video recordings as an effort to increase the geometric quality of the LAPAN-TUBSAT image. The correction model rectification of a simple single photograph is used for geometric correction. While the using of super resolution operator for increasing the video image resolution. The correction model rectification of a simple single photograph is used for geometric correction. While the super resolution operator attempted to efforts to increase the resolution of the video image. The experimental results shows geo-reference image with better geometric quality. The evaluation of LAPAN-TUBSAT performance should be carried out In the near future especially for providing Altitude information (Z). This is related to satellite manoeuvre ability to generate a stereo image with better B/H ratio Keywords:Videography system, LAPAN-TUBSAT Satellite, Geometric image improvement ABSTRAKIndonesia telah membangun dan mengoperasikan sistem satelit-mikro LAPAN-TUBSAT sejak tahun 2007 guna mendukung aplikasi surveilen atau pemantauan cepat obyek di permukaan Bumi. LAPAN-TUBSAT membawa sistem kamera video utama sebagai sensor pencitraan dengan resolusi 5 m dan lebar cakupan 3.5 km tetapi masih memiliki kelemahan geometrik. Tulisan ini mengulas sejumlah hal yang terkait dengan pemrosesan data hasil rekaman video LAPAN-TUBSAT sebagai upaya untuk meningkatkan kualitas geometrik dari citra LAPAN-TUBSAT. Model koreksi rektifikasi foto tunggal sederhana digunakan untuk koreksi geometrik. Sedangkan operator super-resolusi dicobakan untuk upaya peningkatan resolusi citra video. Hasil percobaan dapat menghasilkan citra bergeoreferensi dengan kualitas geometrik yang lebih baik. Di masa mendatang, perlu dilakukan percobaan untuk mengevaluasi kemampuan LAPAN-TUBSAT dalam menghasilkan informasi ketinggian (Z). Hal ini terkait dengan kemampuan manuver dari satelit untuk menghasilkan citra stereo dengan nilai B/H rasio yang lebih baik. Kata kunci: Sistem videografi, Satelit LAPAN-TUBSAT, Peningkatan kualitas geometrikCitra