The Ag nanoparticles were deposited on the hBN surface, and the synergistic effect of hexagonal boron nitride nanosheets and silver nanoparticles was utilized to achieve superlubricity with very low coefficient of friction and wear rate.

A novel PbTiO₃-based perovskite system, (1-x)PbTiO₃-xBiYbO₃, has been synthesized using a distinctive high-pressure and high-temperature technique. The system exhibits an unusual enhanced tetragonalities compared to pristine PbTiO₃ (c/a = 1.064). Consequently, NTE over an extended temperature range has been realized in 0.95PbTiO₃-0.05BiYbO₃ ( = -2.18 ´ 10^-5/K, 300 - 820 K) and 0.90PbTiO₃-0.10BiYbO₃ ( = -1.85 ´ 10^-5/K, 300 - 850 K), respectively, when compared to that of pristine PbTiO₃ ( = -1.99 ´ 10^-5/K, 300 - 763 K). Our experimental and theoretical studies indicate that the improved tetragonalities and expanded NTE temperature range result from stronger Pb/Bi-O and Ti/Yb-O bond strengths, and an asymmetrically distributed charge density. The present study presents a new instance of NTE across a broad temperature range, highlighting its potential as an effective thermal expansion compensator.

Cellular ceramic structures (CCSs) are promising candidates for structural components due to their low density and superior strength. However, the brittleness and poor energy absorption of CCSs severely limit their applications. Inspired by the dual-phase interpenetrating architectures in natural materials, bioinspired dual-phase composites were developed to achieve superior strength and energy absorption simultaneously. Importantly, structural components are subjected to not only quasi-static loading but also dynamic impact in application. Although mechanical properties of dual-phase composites under quasi-static loading have been investigated, their performance under dynamic loading has rarely been revealed. Moreover, how structural parameters affect mechanical properties of CCSs-based dual-phase interpenetrating composites remains unclear.

Researchers from Beihang University, Beijing, have developed an innovative solution to address the coexistence challenges between airborne pulse radar and communication systems. Published in the Chinese Journal of Aeronautics, the study introduces a Dynamic Spectrum and Power Allocation based on Genetic Algorithm (GA-DSPA) method. This breakthrough enables optimization of spectrum and power resources, significantly improving the performance of both systems while maintaining electromagnetic compatibility.

A joint research team from the Defense Innovation Institute at the Chinese Academy of Military Science and the College of Aerospace Science and Engineering at the National University of Defense Technology has developed a novel method for satellite 3D component layout optimization based on engineering requirements. The satellite 3D component layout problem involves determining both component assignment schemes and position variables simultaneously with complex multidisciplinary constraints, making it an NP-hard multi-constrained bilevel combinatorial optimization problem. The team proposed a Mixed Integer Programming (MIP) model to formulate the heat dissipation performance objective and the constraints of component 3D geometry, system stability, and special component position, transforming the original bilevel problem into a single-level optimization problem. Case studies demonstrate that the proposed method can efficiently generate layout solutions, providing fresh insights for engineering layout design.

Lead scandium tantalate (PbSc_0.5Ta_0.5O₃, PST) is one of the most promising ferroelectric materials for electrocaloric (EC) refrigeration because of the large enthalpy change (ΔH) at room temperature (RT), whose properties are determined by the ordering arrangement of two kinds of heterovalent ions in B-sites. The highly ordered PST ceramic always has excellent EC properties, while it is difficult to achieve. Besides, research on the modulation of ordering degree (Ω) in PST ceramics is still rare up to now, particularly regarding its impact on ferroelectric properties, phase transition characteristics, and electrocaloric effects. Thus, it is imperative to bridge this research gap.

The development of multifunctional composites with desired electromagnetic wave absorption and antibacterial performance for the medical field has aroused wide concern. In this work, SiOC/Ag composites were successfully fabricated via liquid phase method. When the filler content of SiOC/Ag-3 is 40 wt.%, SiOC/Ag-3 exhibits excellent electromagnetic wave absorption performance, achieving a minimum reflection loss value of -58.03 dB with a matching thickness of only 2.82 mm. The superior electromagnetic wave absorption performance is attributed to multiple reflections, conductive loss and interfacial polarization loss. Besides, the RCS simulation indicates all RCS values of PEC with SiOC/Ag-3 coating are below -20 dB·m² across the incident angle range from -60° to 60°, exhibiting strong radar stealth performance. Moreover, SiOC/Ag composites also achieve excellent antibacterial ability to E. coli and S.aureus by reactive oxygen species under visible light radiation. This work provides new insights into the design and development of bifunctional composites with electromagnetic wave absorption and antibacterial performance for application in medical devices.