Opto-Electronic Advances (光电进展)•2026•DOI: 10.29026/oea.2026.250267
Scene-level passive 3D imaging under natural conditions remains a critical unmet need, as established techniques such as structured light, LiDAR, and active stereo rely on controlled illumination and scanning, limiting their applicability to large, dynamic outdoor environments. Passive polarization 3D imaging offers inherent advantages for long-range, high-precision reconstruction but is fundamentally impeded by two obstacles: the π ambiguity of the azimuth component of surface normals and the discontinuity of multiple targets within a scene. This study introduces a scene-level passive polarization 3D imaging method that integrates binocular stereo vision with polarization cues. The reconstruction of discontinuous targets is formulated as a minimization problem, where pixel-level normal directions from polarization and absolute scale information from binocular stereo serve as mutual constraints for iterative optimization. This framework resolves the discontinuity challenge and recovers true depth. A scale normalization strategy globally aligns multi-view measurement data, eliminating inter-frame scale inconsistencies that hinder dynamic reconstruction. Multi-frame point cloud fusion yields the final scene-level 3D structure. Experimental validation on natural field scenes demonstrates robust, wide-scene, high-accuracy passive video reconstructions with centimeter-level precision. This passive polarization stereo approach represents a significant advancement in scene-level 3D imaging, with potential applications in autonomous navigation, environmental monitoring, and cultural heritage documentation.
Nano-Micro Letters•2025•DOI: 10.1007/s40820-025-01727-y
Rechargeable zinc (Zn)-ion batteries (RZIBs) with hydrogel electrolytes (HEs) have gained significant attention in the last decade owing to their high safety, low cost, sufficient material abundance, and superb environmental friendliness, which is extremely important for wearable energy storage applications. Given that HEs play a critical role in building flexible RZIBs, it is urgent to summarize the recent advances in this field and elucidate the design principles of HEs for practical applications. This review systematically presents the development history, recent advances in the material fundamentals, functional designs, challenges, and prospects of the HEs-based RZIBs. Firstly, the fundamentals, species, and flexible mechanisms of HEs are discussed, along with their compatibility with Zn anodes and various cathodes. Then, the functional designs of hydrogel electrolytes in harsh conditions are comprehensively discussed, including high/low/wide-temperature windows, mechanical deformations (e.g., bending, twisting, and straining), and damages (e.g., cutting, burning, and soaking). Finally, the remaining challenges and future perspectives for advancing HEs-based RZIBs are outlined.
Int. Journal of Mining Science and Technology (采矿与安全工程)•2025•DOI: 10.1016/j.ijmst.2025.06.008
Phenolic foam (PF) has attracted growing attention in plugging areas due to its lightweight, flame retardancy and high fillability, yet its friable character and high reaction temperature severely weaken its potentials toward practical coal mining applications. Herein, a novel phenolic composite material filled with modified fly ash (MFA) geopolymer has been proposed to address the above issues. By modifying fly ash (FA) particles with siloxanes, robust interfacial bonding between the organic PF polymer and inorganic geopolymer network has been established, which enables modulation of their micro-morphologies to optimize their macro performances. The foam structure of PF evolves from an open-cell to a closed-cell morphology with the incorporation of MFA, leading to a decreased pulverization ratio (41%) while enhanced mechanical properties (15%). Compared with neat PF, the composite exhibits faster gelation dynamics during curing, with a maximum reaction temperature as low as only 40 °C. PF/MFA composite show high reliability against gas leakage during a laboratory designed coal mine plugging test. Furthermore, the formation of a silica hybrid char layer with higher graphitization degree and a multiple continuous closed-cell structure following the combustion of PF/MFA effectively inhibits the release of combustible volatiles and toxic gases. It is provided that this strategy of geopolymer filled polymer cross-linking networks with tunable morphology opens up an avenue for advanced mining phenolic filling materials.