g MEMBRANE SCIENCE
Electrospun nanofiber from various source of expanded polystyrene (EPS) waste This paper wrote by an international group of scientist, including Dr. Eng Muhammah Miftahul Munir (FMIPA ITB) reported on the fabrication of nanofibrous membranes from various sources of expanded polystyrene (EPS) waste using electrospinning technique and their application as air filter media. The filter membranes were made from four EPS waste sources, i.e. food packaging, EPS craft, instant noodle cup, and electronic packaging. The properties of the membranes fabricated from those sources were compared to obtain the best EPS waste source for air filter application. To make the precursor solutions, those samples were dissolved in d-limonene:DMF . The solid EPS density, solution viscosity, and surface tension were measured. The fiber diameter and morphology of nanofibers were characterized by scanning electron microscopy (SEM) for each EPS variation. TIMES CITED
45
JOURNAL IMPACT FACTOR
7.145
Dr. Eng. Muhammad Miftahul Munir Abdul Rajak, Dian Ahmad Hapidin, Ferry Iskandar, Muhammad Miftahul Munir, and Khairurrijal Waste Management Volume 103, Pages 76 – 86, 15 February 2020
The fabricated membrane properties (crystallinity, wettability, and mechanical strength) and filtration properties (pressure drop, PM2.5 filtration efficiency, and quality factor) were fully characterized and analyzed. Homogeneous fiber diameter with various morphologies (beaded, wrinkled, and smooth fiber) were obtained from all samples with hydrophobic to super-hydrophobic surface. Also, the EPS solid density affected the solution viscosity with certain expression, which then affected the fabricated membrane packing density, porosity, and mechanical properties. Overall, the experimental results showed that all EPS nanofiber filters had great potential as an air filter media. The EPS filter made from food packaging waste with the solution concentration of 15 wt% exhibited the highest efficiency and quality factor .*
g TRAVEL BEHAVIOUR
To compete or not compete Exploring the relationships between motorcycle-based ride-sourcing, motorcycle taxis, and public transport in the Jakarta metropolitan area Muhammad Zudhy Irawan, Prawira F. Belgiawan, Ari K. M. Tarigan, and F. Wijanarko Transportation Volume 47, Issue 5, Pages 2367 – 2389, 1 October 2020
In the last decade, the emergence of ride-sourcing services has transformed personal trip behavior. In the context of Indonesia, ride-sourcing services have evolved into two modes of transport: motorcycle-based and car-based. The presence of such services has strongly impacted consumers’ choices of travel mode. However, the main question is whether the ride-sourcing service is a complement or a substitute for the existing public transport and conventional taxis. Prawira F. Belgiawan Ph.D., scientist with Business Strategy and Marketing Interest Group ITB is co-author of a study to explore the relationships between motorcycle-based ride-sourcing, motorcycle taxis, and public transport in the Jakarta metropolitan area.
TIMES CITED
37
JOURNAL IMPACT FACTOR
5.192
Prawira Fajarindra Belgiawan, Ph.D.
10 JAN–MARCH 2023
ISSUE 1
The result shows that motorcycle-based ride-sourcing works as a complementary mode for the TransJakarta bus and Jakarta commuter train, but as a competitor with the motorcycle taxis. Contrarily, motorcycle taxis supported the existence of motorcycle-based ridesourcing. The study also found that individuals use motorcycle taxis as feeders to transit stops.*