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All Journal Multidiciplinary Output Research for Actual and International Issue (Morfai Journal) Jurnal Ragam Pengabdian
Riza Phahlevi Marwanto
Politeknik Keselamatan Transportasi Jalan
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Penerapan Catalytic Converter Berbahan Kuningan, Nikel, Dan Karbon Aktif Sebagai Upaya Penurunan Emisi Gas Buang Co Dan Hc Pada Mesin Bensin Pramudita Putri Audina Winasti; Moch. Aziz Kurniawan; Raka Pratindy; Aat Eska Fahmadi; Riza Phahlevi Marwanto
Jurnal Ragam Pengabdian Vol. 3 No. 2 (2026): Mei-Agustus (Inprogress)
Publisher : Lembaga Teewan Journal Solutions

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62710/q6542y50

Abstract

Exhaust emissions from motor vehicles are a leading source of air pollution in urban areas, particularly carbon monoxide (CO) and hydrocarbon (HC) produced by incomplete combustion. This study examines the performance of a catalytic converter constructed from a composite combination of brass, nickel, and activated carbon materials in mitigating CO and HC emission levels produced by a Suzuki Carry Pick Up gasoline-powered vehicle. An experimental approach was used, measuring exhaust emissions before and after catalytic converter installation at five engine speeds—idle, 1500, 2000, 2500, and 3000 rpm—with three repetitions per condition. Measurements were taken using a calibrated gas analyzer at the Cilincing Vehicle Testing Unit, Jakarta. Results demonstrated that the catalytic converter reduced average CO emissions by 48.29%, from 0.343% to 0.177%, and HC emissions by 16.67%, from 152.4 ppm to 126.7 ppm. Higher engine speeds generally yielded lower emission levels, consistent with improved combustion efficiency as the air-fuel ratio (AFR) approached the stoichiometric value of 14.7:1. A temporary increase in emissions at 2500 rpm was attributed to valve overlap and combustion chamber pressure dynamics at mid-range speeds. These results confirm that brass and nickel as catalysts combined with activated carbon as an adsorbent represent an effective and economically accessible alternative to precious metals in catalytic converter fabrication.
ANALYSIS OF WALKABILITY INDEX AND THERMAL COMFORT AND THEIR EFFECT ON WALKING INTENTION THROUGH PEDESTRIAN SATISFACTION ON JENDERAL SUDIRMAN STREET, JAKARTA Muhamad Abid Faris; Ainun Rahmawati; Edi Purwanto; Riza Phahlevi Marwanto; Setia Hadi Pramudi; Rizal Aprianto
Multidiciplinary Output Research For Actual and International Issue (MORFAI) Vol. 6 No. 4 (2026): Multidiciplinary Output Research For Actual and International Issue
Publisher : RADJA PUBLIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study examines the influence of the walkability index and thermal comfort on pedestrians’ interest in walking, with satisfaction serving as an intervening variable, along Jalan Jenderal Sudirman in Jakarta. A combined approach was used, including an assessment of the walkability index based on Bina Marga Guideline No. 05/P/BM/2023, measurement of thermal comfort using the Temperature Humidity Index (THI), and SEM-PLS with 100 respondents. The walkability index reached 86.10 (Very Good). The THI indicated that shaded areas were comfortable (28.59–28.86), while unshaded areas were uncomfortable (29.28). Six out of seven SEM-PLS hypotheses were significant. Walkability significantly influences satisfaction (β = 0.663, p = 0.000) and interest in walking (β = 0.401, p = 0.000). Thermal comfort significantly influences satisfaction (β = 0.198, p = 0.026), but does not directly influence interest in walking. Thermal comfort significantly influences walking interest through satisfaction (β=0.088, p=0.050), indicating that satisfaction fully mediates this hypothesis. Satisfaction significantly influences walking interest (β=0.445, p=0.000). The model explains 58.7% of the variance in satisfaction and 73.1% of the variance in interest in walking. Keywords: SEM-PLS; temperature humidity index; thermal comfort; walkability index; walking interest; pedestrian satisfaction
Co-Authors Aat Eska Fahmadi Ainun Rahmawati Aprianto, Rizal Edi Purwanto Moch. Aziz Kurniawan Muhamad Abid Faris Pramudita Putri Audina Winasti Raka Pratindy Setia Hadi Pramudi