Aircraft post-crash fires present significant challenges for engineering analysis and safety enhancement. This study introduces As volcanic ash clouds pose significant challenges to aviation safety, particularly in frequent flight operations, effective mitigation strategies are essential. This study investigates the use of electrostatic filters to enhance flight safety in ash-polluted conditions. We evaluate the performance of electrostatic filtration systems in capturing fine ash particles and their potential to improve air quality within aircraft cabins. By simulating ash-laden environments and analyzing filter efficiency, the study demonstrates that electrostatic filters significantly reduce ash concentrations, thereby lowering risks associated with engine wear and cabin contamination. Our findings suggest that integrating electrostatic filtration technology could enable more frequent and safer flights in ash-polluted skies, offering a viable solution to maintain operational efficiency and passenger safety during volcanic events.

The rapidly expanding space economy and ambitious future exploration goals necessitate capabilities beyond simply launching monolithic spacecraft. On-orbit servicing (OOS), which includes inspection, repair, refueling, upgrading, and debris removal, is becoming increasingly vital for sustaining and enhancing space assets [1, 2, 10, 58, 60]. A critical subset of OOS is on-orbit assembly (OOA), the process of constructing larger structures in space from smaller components launched separately [7, 8, 9]. OOA is essential for building systems that are too large or complex to fit within existing launch vehicle fairings, such as large telescopes [7, 45, 46, 55, 56, 57, 88, 89, 90, 91], solar power stations [9], and future habitats or propellant depots [11, 12, 13]. Space robotics plays a central and indispensable role in enabling OOA, providing the dexterity, precision, and operational capability to perform complex manipulation and joining tasks in the challenging space environment [2, 21]. This article reviews the state of the art in robotic technologies applied to on-orbit assembly. We examine the key robotic systems and their capabilities developed through various international programs and missions. We detail significant past and current projects that have demonstrated or are developing OOA technologies, highlighting the progress made. Finally, we discuss the key technical challenges that remain and outline future directions in this transformative field, drawing upon a comprehensive body of research and development [1-93].

This study investigates the fluid dynamic performance and flow behavior of a reversible S-cambered airfoil designed to enhance aerodynamic adaptability in variable operating conditions. Numerical simulations were performed using computational fluid dynamics (CFD) to evaluate lift, drag, and pressure distribution over a range of angles of attack and Reynolds numbers. The results demonstrate that the reversible S-camber configuration significantly improves lift-to-drag ratios compared to conventional symmetric and cambered airfoils, particularly in transitional flow regimes. Flow visualization revealed complex vortex dynamics and delayed flow separation under reversing camber conditions, contributing to improved stall characteristics. These findings indicate that reversible S-cambered airfoils hold strong potential for applications requiring rapid aerodynamic reconfiguration, such as unmanned aerial vehicles (UAVs) and morphing wing systems. Future work will focus on experimental validation and structural integration strategies for real-world implementation.