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"ABSTRACTCombustion process of gasoline fuel is composed by complex hydrocarbon mixture, which usually used in spark ignition engine. But, incomplete combustion could occur from the fuel composition and engine condition, and therefore might lead to unwanted deposits formation in the engine. To surpress the formation of deposit, additive is added to the mixture. This research is using a kinetic model of combustion to control deposit from gasoline fuel and observe the effect of additives to deposit formation. The kinetic model is validated with condition pressure at 1 atm, residence time 0.5 s and equivalency ratio equals to 1. The ratio of fuel is 50 for iso octane, 35 for toluene and 15 for 1 hexene at temperature range 500 800 K. With the addition of polyether amine as additive, the simulation will be done with polyether amine parameter 400 ppm, 600 ppm and 800 ppm. The results from simulation showed the result of deposit formation simulation without addition of additives 0.00314 mg and with addition of additive 400 ppm, 600 ppm and 800 ppm are 0.003125 mg, 0.003122 mg and 0.003121 mg, respectively.

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ABSTRAKProses pembakaran bahan bakar bensin yang terbentuk dari campuran kompleks hidrokarbon merupakan pembakaran yang digunakan dalam mesin spark ignition. Namun, faktor yang dapat berasal dari komposisi bensin dan kondisi mesin, pembakaran tidak sempurna dapat terjadi, dan dapat membentuk deposit yang tidak diinginkan di dalam mesin. Untuk menekan terbentuknya deposit tersebut, dapat digunakan suatu zat aditif yang dicampurkan ke dalam bahan bakar bensin. Penelitian ini menggunakan suatu model kinetika pembakaran untuk mengontrol deposit dari suatu campuran bahan bakar bensin dan untuk melihat pengaruh zat aditif terhadap pembentukan deposit. Model kinetika sudah valid dengan kondisi tekanan 1 atm, resident time 0.5 s dan rasio ekuivalensi 1. Rasio bahan bakar yang digunakan adalah 50 untuk iso-oktana, 35 untuk toluen dan 15 untuk 1-heksena dengan batas temperatur antara 500-800 K. Dengan penambahan zat aditif, dimana dalam penelitian ini menggunakan polyether amine, dilakukan simulasi dengan penambahan zat aditif dengan konsentrasi 400 ppm, 600 ppm dan 800 ppm. Hasil simulasi menunjukan bahwa hasil simulasi pembentukan deposit tanpa zat aditif adalah 0.00314 mg dan dengan penambahan aditif 400 ppm, 600 ppm dan 800 ppm adalah 0.003125 mg, 0.003122 mg dan 0.003121 mg, secara berurutan."

"Application of polymer electrobfte membrane for hydrogen fuel cell is frequentlv not suitable forDMF C. Therefore, many researches are developing new materials. In order to select for DMFCapplications, it is needed to make initial prediction by conducting analysis such as water and methanolswelling, ion exchange capacity, ionic conductivity and methanol permeability. Polysulfone (PSJQ andPolyether-ether ketone (PEEK) are interesting aromatics polymers which are mechanically and thermallystabile. To form electrolyte polymer, sulfonic acid group should be added to PEEK by sulfonation withconcentrate sulfuric acid The objective of blending sulfonated polyether-ether ketone (SPEEK) with PSfis to decrease methanol permeability. The morphology of surface membrane (cross-section) was studiedby SEM analysis. Experiment results showed that blending of PSf and SPEEK produced a non porousmembrane. Adding 10% of PS_f produced the best membrane with ion exchange capacity of 1.9 mea/gpolymer, ionic conductivity 0.00l7 S/cm and methanol permeability 6.4xlG"? cm?/s, water swelling l8%and methanol swelling 17%."