Carbon-based composites with hetero-interfaces is a group of promising electromagnetic wave absorbing materials (EWAMs) for its excellent dielectric loss. For developing this kind of EWAM, in situ constructing hetero-interfaces and...

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Comprehensive Summary For enhancing the electromagnetic wave (EW) attenuation and adsorption, rational constructing and homogeneously distributing bimetallic electromagnetic coupling units in hollow structure is an effective way, but hard to achieve. Herein, a CoNi‐doped hybrid zeolite imidazole framework was synthesized as precursor, which was further converted into a hollow CoNi‐bimetallic doped molybdenum carbide sphere (H‐CoNi@MoC/NC) through a two‐step etching and calcination strategy. At the loading amount of 15 wt%, a strong absorption of minimum reflection loss (RLmin) of –60.05 dB at 7.2 GHz with the thickness of 3.1 mm and a wide effective adsorption bandwidth (EAB) of 3.52 GHz at the thickness of 2.5 mm were achieved, which was far beyond the reported MoC‐based metallic hybrids. The crucial synergistic Co‐Ni electromagnetic coupling effect in the composite was characterized, not only enhancing the dipolar/interfacial polarization, but also promoting the impedance matching, displaying the optimized EW absorbing performance.

Path planning technology is the precondition of unmanned aerial vehicle (UAV) airspace safety. For in the running features of the UAV in 3-D space environment, putting forward using fight level (FL) guiding factor to improve the basic ant colony optimization(ACO), which improved the quality and the operation efficiency of path planning; In view of the ACO which easily fell into local optimum in huge space, putting forward using split method to make the improved ACO have a better effect in huge path planning problem; Through simulation experiments, the basic algorithm and improved algorithm and split method were analyzed, the results show that the improved algorithm has a good 3-D path planning ability.