Shapes with negative pressure gradients on their surfaces were proposed in order to avoid separation of the boundary layer. Wind tunnel tests have confirmed the absence of separation on some bodies of revolution similar to the trunks of aquatic animals. According to the Tollmin-Schlichting-Lin theory, the boundary-layer on a flat plate remains laminar for any... more

Rapid urbanization in Greater Kuala Lumpur has intensified automobile dependency, causing congestion and environmental concerns. Although urban rail systems are promoted as sustainable alternatives, their adoption remains limited. This study examines how service quality influences commuter loyalty and whether satisfaction mediates this relationship within Malaysia’s urban rail context (KTM Komuter, LRT, MRT). A structured questionnaire... more

This study investigates the relationship between average monthly surface temperature and road traffic accidents in England, across ten years. Using (n = 120) on collisions, casualties, and average surface temperature, we applied descriptive statistics, Pearson and Spearman correlations, simple linear regressions, and a multivariate regression controlling for monthly seasonality. Explicitly, surface temperature is treated as... more

In Sub-Saharan Africa, the emergence of e-commerce and the rising population of cities is placing novel strain on logistics systems. The efficiency of last-mile delivery (LMD) is an important factor for improving the economic output and sustainable development of cities, particularly in fast urban development areas. This study investigates LMD efficiency in urbanizing Accra, Ghana,... more

The platform-based motorcycle ride-hailing is changing informal mobility systems in African urban areas, but there is little empirical data on the socio-economic effects, adoption forces, and challenges of sustainability. This paper examines the rise of ORide, a commercial motorcycle e-hailing service in Ibadan, Nigeria, and what this means to mobility, the livelihood of young people,... more

Heavy-duty vehicle (HDV) crashes, particularly those involving tankers and trailers, present severe safety challenges in Nigeria due to the combination of human, vehicular, and infrastructural risk factors. This study investigates the socioeconomic and demographic characteristics of HDV drivers in Southwestern Nigeria and examines their perceptions of factors contributing to road traffic crashes. Using a descriptive... more

There is no integration mechanism available between independent systems (sales and shipment), so it creates uncertainty in the air freight industry. Regarding the problems, freight forwarders or airline sales officers can make a manifest for the shippers; however, various airlines plan different routes for shipping services. But unfortunately, it provides transaction discrepancies between independent systems.... more

Road traffic has become one of the major sources of carbon dioxide emissions. However, there remains a lack of consensus on how urban land use influences these emissions. This study investigates the spatial distribution of municipal-level road traffic carbon dioxide emissions and their land use drivers in Japan’s Kanto region. Ordinary least squares (OLS), geographically... more