Highly efficient chemiresistive gas sensors are crucial for numerous applications. Notably, though the generally high working temperature brings fine sensing performance, as well as causing high power consumption, poor safety, and disabled operational stability. Thanks to the cost-effective, simplified structure and integrated diversity, room temperature (RT) operational mode has been put forward and applied in gas sensor devices. However, insufficient limits of detection limit (LOD) and disappointingly long detection time limit their broad applications, meanwhile, the existing sensing mechanism based on the charge transfer between the analyte gas and the oxide surface hampers room temperature gas sensing with low LOD and rapid speed.

A research team at Beihang University, led by Professor Jianghao Wu, has achieved a significant breakthrough in the design of propulsion systems for future low-altitude transport, particularly electric Vertical Take-Off and Landing (eVTOL) aircraft. Their pioneering work, recently published in the Chinese Journal of Aeronautics, introduces a novel analytical framework for ducted propellers, promising to make these advanced flying vehicles smaller, lighter, and more powerful. This research offers vital support for the burgeoning field of advanced air mobility, aiming to alleviate urban traffic congestion and utilize low-altitude airspace.

In the history of aircraft development, maneuverability has always been an important consideration in the design concept of aircraft. The requirements for aerodynamic characteristics are reflected in high lift-to-drag ratio, high lift coefficient, torque stability and so on. The occurrence of dynamic stall will lead to a sharp drop in lift and a rapid rise in drag, resulting in torque oscillation, which seriously restricts the improvement of aircraft performance, and even leads to aircraft crash in severe cases. The traditional passive flow control cannot cope with the real-time and changeable flow field environment, and the emergence of jet control provides a new way to solve the problem of dynamic stall. Although the research of single jet technology has been relatively sufficient, there are few comparative studies on steady jet and synthetic jet, and there is also a lack of related research on dual synthetic jets. Therefore, it is imperative to fill this research gap.

Operating drones across air and water boundaries poses serious aerodynamic risks due to complex gas-liquid flow interactions. A new finite vortex rotor model developed by researchers in China provides unprecedented insight into how rotors behave near free water surface. The study introduces a predictive boundary that separates safe and unsafe flight zones, offering a powerful tool for the design and control of aerial-aquatic rotorcraft.

A research team from York University in Canada has proposed a revolutionary Dyson-Harrop CubeSat design, capable of harvesting high-density energy from the solar wind using the photoelectric effect. This compact and lightweight system delivers much greater power density than conventional photovoltaic technologies, opening up new possibilities for clean and sustainable space energy applications.

To reduce the vibration of the coaxial helicopter main transmission system considering both level and vertical flight conditions, a vibration evaluation and optimization model was built. A vibration simulation model and a vibration evaluation method was established. A hybrid Gravitational Search Algorithm-Simulated Annealing (GSA-SA) algorithm was combined to balance convergence speed and searching accuracy. The principle test was conducted to prove the accuracy of theoretical method. The optional results show that the vibration of the optimized transmission system decreases significantly, in which the maximum reduction of key vibration indicators reaches more than 20%. The proposed method could be extended to other fields.

Aero-engine hot-end components face grinding challenges due to superalloys' low thermal conductivity, causing high heat, energy consumption, and reliance on unsustainable cooling. Ultrasonic vibration-assisted grinding (UVAG), heat pipe grinding wheels (HPGW), and minimum quantity lubrication (MQL) have been proposed to integrate to reduce heat generation, enhance heat dissipation, and minimize coolant use. In this case, the high-efficiency and sustainable grinding can be achieved with improved surface integrity.