Opto-Electronic Advances (光电进展)•2026•DOI: 10.29026/oea.2026.250229
Programmable metasurfaces have demonstrated potential for dynamic electromagnetic wave manipulation, yet their large-scale deployment is constrained by high communication capacity demands and stringent energy requirements. This work presents an ambient-energy-driven space-time-coding metasurface that achieves space-frequency-division multiplexing while operating self-sufficiently via integrated solar energy harvesting. The metasurface dynamically controls multiple frequencies and spatial propagation directions of reflected waves, enabling four independent communication channels. A four-channel wireless communication prototype transmitted four distinct images to separate user terminals simultaneously and in real time, with energy consumption per bit markedly lower than conventional programmable metasurfaces. The shared-aperture design integrates ambient solar harvesting and low-power programmable elements, eliminating external power supplies. Experimental validation confirms independent multichannel operation with low inter-channel interference. This platform merges ambient energy harvesting, multidimensional microwave manipulation, and direct information modulation on a single physical layer, offering a cost-effective, energy-efficient, and environmentally friendly pathway for high-capacity wireless communications. The results establish a foundational architecture for self-powered reconfigurable intelligent surfaces in next-generation networks.
Int. Journal of Mining Science and Technology (采矿与安全工程)•2026•DOI: 10.1016/j.ijmst.2026.02.004
The influence of the heating rate on the thermo-mechanical response and damage evolution of rock is a critical factor limiting the safety and efficiency of engineering applications. Conventional models are limited, however, as they assume a static coefficient of thermal expansion (CTE) and ignore its dynamic nature under rapid thermal loading. This study confronts this knowledge gap using a synergistic experimental–numerical approach. A custom system combining induction heating and Digital Image Correlation was employed to measure the rate-dependent CTE of both bulk granite and its constituent minerals over various heating rates. These dynamic coefficients were then integrated into a high-fidelity numerical model to simulate microwave-assisted rock breaking. Results definitively show the CTE is strongly rate-dependent. While the quartz phase transition at ~573 °C triggers critical damage, faster heating significantly amplifies strain localization and damage accumulation. Crucially, simulations revealed that under identical microwave loading, the model using dynamic CTE (530 °C/min) reached a 1000 mm² failure area 11 times faster than the model using quasi-static CTE (5 °C/min). This study fundamentally establishes rock's CTE as a dynamic, rate-dependent property, providing a key scientific basis for advancing such thermal fracturing technologies.
Int. Journal of Mining Science and Technology (采矿与安全工程)•2025•DOI: 10.1016/j.ijmst.2025.07.012
Gob-side entry retaining (GER) is widely applied in China. Nevertheless, the stability mechanism of the GER with coal pillar-backfill body (CPBB) under dynamic overburden load remains unexplored. A voussoir beam structure (VBS) model is established to analyze roof structure stability during panel advancement, introducing a VBS stability criterion. Reducing block B length l and immediate roof damage variable D, and increasing coal pillar width xc, lowers the GER structure instability risk. Reducing l and the GER width w leads to a CPBB system stability upswing. A UDEC model was established to systematically reveal how the l, backfill body width xb, and strength affect the stability and coupling performance of the CPPB system by monitoring the crack damage DC. Simulation results indicate that at l=14 m, xb=2.0 m, water-cement ratio 1.5:1, the coal pillar and backfill body have similar DC but maintain stability, resulting in CPPB system coupling degree Ϗ, better. A novel GER method supported by the CPBB was implemented on-site. Monitoring results indicated that the coal pillar peak stresses were 19.17 MPa (ahead), 16.14 MPa (behind), and the backfill body peak stress was 12.27 MPa (maximum). The floor heave was 380 mm, with a 103 mm backfill body rib.
Nano-Micro Letters•2025•DOI: 10.1007/s40820-024-01592-1
Micrometer-sized silicon oxide (SiO) anodes encounter challenges in large-scale applications due to significant volume expansion during the alloy/de-alloy process. Herein, an innovative deep eutectic electrolyte derived from succinonitrile is introduced to enhance the cycling stability of SiO anodes. Density functional theory calculations validate a robust ion–dipole interaction between lithium ions (Li+) and succinonitrile (SN). The cosolvent fluoroethylene carbonate (FEC) optimizes the Li+ solvation structure in the SN-based electrolyte with its weakly solvating ability. Molecular dynamics simulations investigate the regulating mechanism of ion–dipole and cation–anion interaction. The unique Li+ solvation structure, enriched with FEC and TFSI−, facilitates the formation of an inorganic–organic composite solid electrolyte interphase on SiO anodes. Micro-CT further detects the inhibiting effect on the SiO volume expansion. As a result, the SiO|LiCoO2 full cells exhibit excellent electrochemical performance in deep eutectic-based electrolytes. This work presents an effective strategy for extending the cycle life of SiO anodes by designing a new SN-based deep eutectic electrolyte.