Browsing by Author "Hirary, Marisa"

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    ANALYSIS OF THE EFFECT OF FUEL SYSTEM, FUEL TYPES AND SPARK PLUG TYPES ON CO2 GAS EXHAUST USING FACTORIAL DESIGN
    (International Journal of Psychosocial Rehabilitation, Vol.24, Issue 02, 2020) Komarudin, Udin; Suryaman, Nia Nuraeni; Martoni; Hirary, Marisa
    The vehicle combustion system, the type of fuel used and the type of spark plugs, are some of the variables that affect motor vehicle exhaust gases. Some exhaust gases (pollutants) by motorized vehicles include Carbon Dioxide (CO2), Carbon Monoxide (CO), Sulfur Dioxide (SO2), Nitrogen Monoxide (NOx), Hydrocarbon (HC), and Lead, smoke and ash, where Exhaust gas can pollute the air and greatly affect human health. From a number of variables that influence motorized exhaust gas, the author determines the combustion system variable, namely the Carburetors and EFI types, the fuel variable type is Premium (octane 88) and Pertamax (octane 92), as well as the spark plug type variable and Iridium spark plugs, as variables main effect to analyze CO2 exhaust gas. The motorized vehicle used as a trial is a 4-step duck motorcycle, 110 cc. The test equipment used to analyze exhaust gas is the Kane Gas Analyzer (Class1). The research method used is factorial design and variable analysis using Yates' Algorithm, the same as in the previous experiment [1]. Yates’s Algorithm Analysis results that the effect of CO2 exhaust is the greatest due to the fuel system of 1.117 (EFI), the second effect is the type of fuel of 0.450 (Pertamax), and the third effect is the type of spark plug of -0.050 (standard spark plug).
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    DETERMINATION OF PRIORITY SCALE PROVINCIAL ROAD HANDLING IN PURWAKARTA DISTRICT, WEST JAVA
    (International Journal of Engineering & Technology, 2019) Setiawan, Asep; Barnadi, Yudi; Hirary, Marisa; Martoni
    The provincial roads maintenance and repair are often constrained by limited budgets, so that the road management priority is generally determined by policy factors, which often cause roads treatment disparity. The purpose of this study was to determine the criteria and sub-criteria, the weights of criteria and sub-criteria, as well as develop a mathematical equation in order to determine to roads handling priority in the area of Purwakarta, West Java. The Delphi and Cut Off Point methods were applied to determine the criteria, which result in three criteria selected i.e. road condition, traffic volume and economic factors respectively. Afterward, the Analytical Hierarchy Process was used to determine the weighting factors for the criteria and sub-criteria. The results for the criteria weights were as follows: the roads conditions had a weighting factor of 67.7%, the traffic volume of 18.3% and the economy of 13.0%. Based on the criteria and subcriteria weight, a mathematical equation was developed to define the handling priority of roads in Purwakarta.