This week in engineering and applied sciences, we highlight ten open-access studies from journals including Transportmetrica B, Results in Engineering, Applied Sciences, and PLoS ONE.
📊 This week at a glance
🌍 African-led research
A new traffic flow model accounts for lane indiscipline and mixed speeds in heterogeneous traffic.
The model extends second-order multi-class traffic flow equations by adding a relative drag function, which captures how different vehicle classes interact when lane discipline breaks down. This changes the assumption that traffic streams are homogeneous and lane-bound, offering a more realistic tool for cities where motorcycles, cars, and trucks share roads without strict lane rules. For African traffic management, it could improve simulation of congestion and safety interventions in rapidly motorising cities.
Unreliable grid and back-feeding reduce the economic viability of rooftop solar with battery storage.
Using Eagle Square in Abuja as a case study, the analysis shows that grid outages and selling excess power back to the grid can undermine the financial returns of a grid-connected solar-plus-battery system. This challenges the assumption that grid connection always improves solar economics, especially where the grid is unreliable. For African policymakers promoting rooftop solar, the finding suggests that battery storage and grid reliability must be co-optimised to make projects bankable.
A Gamma stochastic model predicts railway wheel remaining life from real optical measurements.
Using 80 wheels from ten vehicles monitored with a CALIPRI C42 profilometer, the study shows that a multi-indicator Gamma degradation model can estimate remaining useful life (RUL) by tracking cumulative, random wear. This moves beyond fixed maintenance schedules to condition-based predictions, which can reduce downtime and safety risks. For African rail operators, it offers a data-driven way to plan wheel maintenance where resources are tight.
The UN Cybercrime Convention may not fix the failures of Mutual Legal Assistance Treaties.
The paper argues that MLATs often fail to deliver timely digital evidence or hold cross-border offenders accountable, and the UNCC—adopted in December 2024—is the biggest multilateral response since the Budapest Convention. However, its anticipated impact in India and beyond remains uncertain because enforcement depends on domestic implementation and cooperation. For African countries, the analysis highlights the need to strengthen legal frameworks and technical capacity to benefit from the convention.
A semi-analytical model compares hybrid nanofluid flow with oxytactic microbes over cone, wedge, and plate.
The study integrates thermal radiation, viscous dissipation, Dufour-Soret effects, and magnetohydrodynamics using the Xue thermal conductivity model for a hybrid nanofluid containing oxytactic microbes. It provides a computational framework to analyse Marangoni-driven mixed convection, which is relevant to heat transfer and biomedical applications. For African researchers, it demonstrates a low-cost semi-analytical method for complex fluid dynamics problems.
Metaheuristic-tuned PI controllers improve electric vehicle motor performance using a multi-error objective.
The paper tunes proportional–integral (PI) controllers for field-oriented control (FOC) of permanent magnet synchronous motors (PMSMs) in EVs using a multi-error ITAE (integral of time-weighted absolute error) objective. This approach optimises speed and current loops simultaneously, overcoming the limitations of single-performance tuning. For African EV development, it offers a way to enhance motor efficiency and dynamic response without expensive hardware changes.
🔬 Global breakthroughs
M2SNet reduces redundant information in medical image segmentation by using multi-scale subtraction.
The network replaces element-wise addition or concatenation in U-shaped decoders with a multi-scale subtraction operation, which preserves complementary features and sharpens localisation. This could lead to more accurate early diagnosis from medical images. For African healthcare, where radiologist shortages are common, such automated tools could support screening if validated locally.
igraph 1.0 released, enabling fast network analysis across Python, R, and Mathematica.
The igraph library combines a fast C core with beginner-friendly interfaces, and version 1.0 marks twenty years of development. This lowers the barrier for researchers to analyse graphs in their preferred language. For African data scientists, it provides a free, robust tool for network studies in epidemiology, social science, and infrastructure.
Large language model-based agents are defined and classified in a new review.
The paper surveys LLM-based intelligent agents that use natural language for reasoning, planning, and tool use, and proposes definitions and methods. It clarifies a rapidly evolving field that often lacks common terminology. For African AI researchers, it offers a structured entry point to build and evaluate agents for local challenges.
A coupled thermo-hydraulic-mechanical model improves geothermal reservoir assessment.
The study addresses the limitation of single-parameter evaluation by using a THM-coupled single-fracture model that accounts for mechanical deformation from cold fluid injection. This can lead to more accurate predictions of heat extraction. For African countries with geothermal potential, such as Kenya, it supports better reservoir management.
All papers are open access. Explore more Technology & Engineering research on FRELIP · discover open scholarship at frelip.org and search 36,000+ open works at search.frelip.org. FRELIP — born in Nigeria, built for African scholarship, serving the world.