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"Tujuan dari penelitian ini adalah untuk meneliti pengaruh 0,25 % Molibdenum (Mo) yang dikandung dalam besi tuang nodular terhadap sifat mekanis Austempered Ductile Iron (ADI). Variasi temperatur dan waktu tahan digunakan dalam proses perlakuan panas. Dengan 0,25 % Mo dalam besi tuang, ADI yang dibuat, menghasilkan suatu nilai tegangan tarik yang besar dan menurunkan elongasi bila kita bandingkan dengan as-cast (paduan dan non paduan besi tuang tanpa perlakuan panas). Nilai energi impak terbesar didapat pada temperatur austenisasi 9000 C dan austempering 3750 C dengan waktu tahan selama 60 menit. Struktur berubah menjadi ausferrit.

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The aim of this research is to investigate the effects of 0.25 % Mo (Molybdenum) which is contained in the ductile cast iron on mechanical properties of Austempered Ductile Iron (ADI). The various temperatures and the holding times are used in the heat treatment processes. Using a given 0.25 % Mo in the ductile iron, ADI's alloyed developes a higher ultimate tensile stress value and decreases the elongation if we compare with the as cast (non alloy ductile iron). The higher impact energy value obtained at 9000 C austenization and 375o C austempering temperatures during 60 minutes holding times. The structure changes into ausferrit."

"This paper describes thecase study of Semanggi intersection in Jakarta, a dynamic model of emissionreduction in the land transportation sector. The urban transportation system isa complex system with multiple variables, feedback loops, and is influenced bysocial, economic and environmental factors. The proposed model consists of twosubmodels: Vehicle Fleet and Emission Calculation. The model runs inPowersim Studio software using data from the Indonesia Japan EconomicPartnership Agreement, and the TrafficManagement Centre of the Indonesian National Police. The test was conducted by developing two scenarios:Business As Usual and Intention. The estimated results to beobtained using the first scenario in 2021 should be 1,113,398 units, while thesecond scenario is estimated to produce 850,733 units. We hypothesize that theIntentional Approach will have a more significant impact than the TechnicalApproach, which requires more investment. The Intentional Approach is designed to improve the intention ofprivate car users to switch to public transportation. The Technical Approach to the emission measurement of everyvehicle in a certain area is the data of vehicle emission which are usuallytaken to determine the current condition. This research will no doubthave a positive impact on emission reduction in Jakarta."

"In 2016, the mandatory use of biodiesel as a substitute fuel by up to 20%,as introduced by the Indonesian Ministry of Energy and Mineral Resources,forced vehicle manufacturers to invent suitable engines that would acceptbiodiesel. The use of biodiesel in such a large proportion is highly risky,particularly due to the formation of deposits in the combustion chamberengines. The previous method of fuel droplets are placed on a hot plateapproach produces deposits are slightly different from those generated by areal engine, therefore to obtain realistic deposits it is necessary to modifythis method so temperatures as hot as those in a real engine. In this study,the potential deposit formation of biodiesel fuel was examined by conductingthe deposition process and the evaporation of fuel on a stainless-steel plate(SS), which was placed in a closed space. Deposit characterization was carried outon a hot plate using Scanning Electron Microscopy (SEM). The test results showeddifferences in the structures of the deposits produced by biodiesel and dieselfuel; fine structures were seen in the former, while those of the latter wererougher and more porous. Deposit results that are similar to what is seen in areal engine will be very helpful for knowing the patterns, structures, and mechanismof the formation of deposits in such an environment."